machdep.c revision 287126
1/*- 2 * Copyright (c) 1992 Terrence R. Lambert. 3 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 38 */ 39 40#include <sys/cdefs.h> 41__FBSDID("$FreeBSD: stable/10/sys/i386/i386/machdep.c 287126 2015-08-25 14:39:40Z marcel $"); 42 43#include "opt_apic.h" 44#include "opt_atalk.h" 45#include "opt_atpic.h" 46#include "opt_compat.h" 47#include "opt_cpu.h" 48#include "opt_ddb.h" 49#include "opt_inet.h" 50#include "opt_ipx.h" 51#include "opt_isa.h" 52#include "opt_kstack_pages.h" 53#include "opt_maxmem.h" 54#include "opt_mp_watchdog.h" 55#include "opt_npx.h" 56#include "opt_perfmon.h" 57#include "opt_platform.h" 58#include "opt_xbox.h" 59#include "opt_kdtrace.h" 60 61#include <sys/param.h> 62#include <sys/proc.h> 63#include <sys/systm.h> 64#include <sys/bio.h> 65#include <sys/buf.h> 66#include <sys/bus.h> 67#include <sys/callout.h> 68#include <sys/cons.h> 69#include <sys/cpu.h> 70#include <sys/eventhandler.h> 71#include <sys/exec.h> 72#include <sys/imgact.h> 73#include <sys/kdb.h> 74#include <sys/kernel.h> 75#include <sys/ktr.h> 76#include <sys/linker.h> 77#include <sys/lock.h> 78#include <sys/malloc.h> 79#include <sys/memrange.h> 80#include <sys/msgbuf.h> 81#include <sys/mutex.h> 82#include <sys/pcpu.h> 83#include <sys/ptrace.h> 84#include <sys/reboot.h> 85#include <sys/rwlock.h> 86#include <sys/sched.h> 87#include <sys/signalvar.h> 88#ifdef SMP 89#include <sys/smp.h> 90#endif 91#include <sys/syscallsubr.h> 92#include <sys/sysctl.h> 93#include <sys/sysent.h> 94#include <sys/sysproto.h> 95#include <sys/ucontext.h> 96#include <sys/vmmeter.h> 97 98#include <vm/vm.h> 99#include <vm/vm_extern.h> 100#include <vm/vm_kern.h> 101#include <vm/vm_page.h> 102#include <vm/vm_map.h> 103#include <vm/vm_object.h> 104#include <vm/vm_pager.h> 105#include <vm/vm_param.h> 106 107#ifdef DDB 108#ifndef KDB 109#error KDB must be enabled in order for DDB to work! 110#endif 111#include <ddb/ddb.h> 112#include <ddb/db_sym.h> 113#endif 114 115#ifdef PC98 116#include <pc98/pc98/pc98_machdep.h> 117#else 118#include <isa/rtc.h> 119#endif 120 121#include <net/netisr.h> 122 123#include <machine/bootinfo.h> 124#include <machine/clock.h> 125#include <machine/cpu.h> 126#include <machine/cputypes.h> 127#include <machine/intr_machdep.h> 128#include <x86/mca.h> 129#include <machine/md_var.h> 130#include <machine/metadata.h> 131#include <machine/mp_watchdog.h> 132#include <machine/pc/bios.h> 133#include <machine/pcb.h> 134#include <machine/pcb_ext.h> 135#include <machine/proc.h> 136#include <machine/reg.h> 137#include <machine/sigframe.h> 138#include <machine/specialreg.h> 139#include <machine/vm86.h> 140#ifdef PERFMON 141#include <machine/perfmon.h> 142#endif 143#ifdef SMP 144#include <machine/smp.h> 145#endif 146#ifdef FDT 147#include <x86/fdt.h> 148#endif 149 150#ifdef DEV_APIC 151#include <machine/apicvar.h> 152#endif 153 154#ifdef DEV_ISA 155#include <x86/isa/icu.h> 156#endif 157 158#ifdef XBOX 159#include <machine/xbox.h> 160 161int arch_i386_is_xbox = 0; 162uint32_t arch_i386_xbox_memsize = 0; 163#endif 164 165#ifdef XEN 166/* XEN includes */ 167#include <xen/xen-os.h> 168#include <xen/hypervisor.h> 169#include <machine/xen/xenvar.h> 170#include <machine/xen/xenfunc.h> 171#include <xen/xen_intr.h> 172 173void Xhypervisor_callback(void); 174void failsafe_callback(void); 175 176extern trap_info_t trap_table[]; 177struct proc_ldt default_proc_ldt; 178extern int init_first; 179int running_xen = 1; 180extern unsigned long physfree; 181#endif /* XEN */ 182 183/* Sanity check for __curthread() */ 184CTASSERT(offsetof(struct pcpu, pc_curthread) == 0); 185 186extern register_t init386(int first); 187extern void dblfault_handler(void); 188 189#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 190#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 191 192#if !defined(CPU_DISABLE_SSE) && defined(I686_CPU) 193#define CPU_ENABLE_SSE 194#endif 195 196static void cpu_startup(void *); 197static void fpstate_drop(struct thread *td); 198static void get_fpcontext(struct thread *td, mcontext_t *mcp, 199 char *xfpusave, size_t xfpusave_len); 200static int set_fpcontext(struct thread *td, mcontext_t *mcp, 201 char *xfpustate, size_t xfpustate_len); 202#ifdef CPU_ENABLE_SSE 203static void set_fpregs_xmm(struct save87 *, struct savexmm *); 204static void fill_fpregs_xmm(struct savexmm *, struct save87 *); 205#endif /* CPU_ENABLE_SSE */ 206SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); 207 208#ifdef DDB 209extern vm_offset_t ksym_start, ksym_end; 210#endif 211 212/* Intel ICH registers */ 213#define ICH_PMBASE 0x400 214#define ICH_SMI_EN ICH_PMBASE + 0x30 215 216int _udatasel, _ucodesel; 217u_int basemem; 218 219#ifdef PC98 220int need_pre_dma_flush; /* If 1, use wbinvd befor DMA transfer. */ 221int need_post_dma_flush; /* If 1, use invd after DMA transfer. */ 222 223static int ispc98 = 1; 224SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 225#endif 226 227int cold = 1; 228 229#ifdef COMPAT_43 230static void osendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask); 231#endif 232#ifdef COMPAT_FREEBSD4 233static void freebsd4_sendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask); 234#endif 235 236long Maxmem = 0; 237long realmem = 0; 238 239#ifdef PAE 240FEATURE(pae, "Physical Address Extensions"); 241#endif 242 243/* 244 * The number of PHYSMAP entries must be one less than the number of 245 * PHYSSEG entries because the PHYSMAP entry that spans the largest 246 * physical address that is accessible by ISA DMA is split into two 247 * PHYSSEG entries. 248 */ 249#define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1)) 250 251vm_paddr_t phys_avail[PHYSMAP_SIZE + 2]; 252vm_paddr_t dump_avail[PHYSMAP_SIZE + 2]; 253 254/* must be 2 less so 0 0 can signal end of chunks */ 255#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2) 256#define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2) 257 258struct kva_md_info kmi; 259 260static struct trapframe proc0_tf; 261struct pcpu __pcpu[MAXCPU]; 262 263struct mtx icu_lock; 264 265struct mem_range_softc mem_range_softc; 266 267static void 268cpu_startup(dummy) 269 void *dummy; 270{ 271 uintmax_t memsize; 272 char *sysenv; 273 274#ifndef PC98 275 /* 276 * On MacBooks, we need to disallow the legacy USB circuit to 277 * generate an SMI# because this can cause several problems, 278 * namely: incorrect CPU frequency detection and failure to 279 * start the APs. 280 * We do this by disabling a bit in the SMI_EN (SMI Control and 281 * Enable register) of the Intel ICH LPC Interface Bridge. 282 */ 283 sysenv = getenv("smbios.system.product"); 284 if (sysenv != NULL) { 285 if (strncmp(sysenv, "MacBook1,1", 10) == 0 || 286 strncmp(sysenv, "MacBook3,1", 10) == 0 || 287 strncmp(sysenv, "MacBook4,1", 10) == 0 || 288 strncmp(sysenv, "MacBookPro1,1", 13) == 0 || 289 strncmp(sysenv, "MacBookPro1,2", 13) == 0 || 290 strncmp(sysenv, "MacBookPro3,1", 13) == 0 || 291 strncmp(sysenv, "MacBookPro4,1", 13) == 0 || 292 strncmp(sysenv, "Macmini1,1", 10) == 0) { 293 if (bootverbose) 294 printf("Disabling LEGACY_USB_EN bit on " 295 "Intel ICH.\n"); 296 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8); 297 } 298 freeenv(sysenv); 299 } 300#endif /* !PC98 */ 301 302 /* 303 * Good {morning,afternoon,evening,night}. 304 */ 305 startrtclock(); 306 printcpuinfo(); 307 panicifcpuunsupported(); 308#ifdef PERFMON 309 perfmon_init(); 310#endif 311 312 /* 313 * Display physical memory if SMBIOS reports reasonable amount. 314 */ 315 memsize = 0; 316 sysenv = getenv("smbios.memory.enabled"); 317 if (sysenv != NULL) { 318 memsize = (uintmax_t)strtoul(sysenv, (char **)NULL, 10) << 10; 319 freeenv(sysenv); 320 } 321 if (memsize < ptoa((uintmax_t)cnt.v_free_count)) 322 memsize = ptoa((uintmax_t)Maxmem); 323 printf("real memory = %ju (%ju MB)\n", memsize, memsize >> 20); 324 realmem = atop(memsize); 325 326 /* 327 * Display any holes after the first chunk of extended memory. 328 */ 329 if (bootverbose) { 330 int indx; 331 332 printf("Physical memory chunk(s):\n"); 333 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 334 vm_paddr_t size; 335 336 size = phys_avail[indx + 1] - phys_avail[indx]; 337 printf( 338 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n", 339 (uintmax_t)phys_avail[indx], 340 (uintmax_t)phys_avail[indx + 1] - 1, 341 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE); 342 } 343 } 344 345 vm_ksubmap_init(&kmi); 346 347 printf("avail memory = %ju (%ju MB)\n", 348 ptoa((uintmax_t)cnt.v_free_count), 349 ptoa((uintmax_t)cnt.v_free_count) / 1048576); 350 351 /* 352 * Set up buffers, so they can be used to read disk labels. 353 */ 354 bufinit(); 355 vm_pager_bufferinit(); 356#ifndef XEN 357 cpu_setregs(); 358#endif 359} 360 361/* 362 * Send an interrupt to process. 363 * 364 * Stack is set up to allow sigcode stored 365 * at top to call routine, followed by call 366 * to sigreturn routine below. After sigreturn 367 * resets the signal mask, the stack, and the 368 * frame pointer, it returns to the user 369 * specified pc, psl. 370 */ 371#ifdef COMPAT_43 372static void 373osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 374{ 375 struct osigframe sf, *fp; 376 struct proc *p; 377 struct thread *td; 378 struct sigacts *psp; 379 struct trapframe *regs; 380 int sig; 381 int oonstack; 382 383 td = curthread; 384 p = td->td_proc; 385 PROC_LOCK_ASSERT(p, MA_OWNED); 386 sig = ksi->ksi_signo; 387 psp = p->p_sigacts; 388 mtx_assert(&psp->ps_mtx, MA_OWNED); 389 regs = td->td_frame; 390 oonstack = sigonstack(regs->tf_esp); 391 392 /* Allocate space for the signal handler context. */ 393 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 394 SIGISMEMBER(psp->ps_sigonstack, sig)) { 395 fp = (struct osigframe *)(td->td_sigstk.ss_sp + 396 td->td_sigstk.ss_size - sizeof(struct osigframe)); 397#if defined(COMPAT_43) 398 td->td_sigstk.ss_flags |= SS_ONSTACK; 399#endif 400 } else 401 fp = (struct osigframe *)regs->tf_esp - 1; 402 403 /* Translate the signal if appropriate. */ 404 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 405 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 406 407 /* Build the argument list for the signal handler. */ 408 sf.sf_signum = sig; 409 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 410 bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo)); 411 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 412 /* Signal handler installed with SA_SIGINFO. */ 413 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 414 sf.sf_siginfo.si_signo = sig; 415 sf.sf_siginfo.si_code = ksi->ksi_code; 416 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 417 sf.sf_addr = 0; 418 } else { 419 /* Old FreeBSD-style arguments. */ 420 sf.sf_arg2 = ksi->ksi_code; 421 sf.sf_addr = (register_t)ksi->ksi_addr; 422 sf.sf_ahu.sf_handler = catcher; 423 } 424 mtx_unlock(&psp->ps_mtx); 425 PROC_UNLOCK(p); 426 427 /* Save most if not all of trap frame. */ 428 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 429 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 430 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 431 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 432 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 433 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 434 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 435 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 436 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 437 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 438 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 439 sf.sf_siginfo.si_sc.sc_gs = rgs(); 440 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 441 442 /* Build the signal context to be used by osigreturn(). */ 443 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0; 444 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 445 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 446 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 447 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 448 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 449 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 450 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 451 452 /* 453 * If we're a vm86 process, we want to save the segment registers. 454 * We also change eflags to be our emulated eflags, not the actual 455 * eflags. 456 */ 457 if (regs->tf_eflags & PSL_VM) { 458 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */ 459 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 460 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 461 462 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 463 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 464 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 465 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 466 467 if (vm86->vm86_has_vme == 0) 468 sf.sf_siginfo.si_sc.sc_ps = 469 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 470 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 471 472 /* See sendsig() for comments. */ 473 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 474 } 475 476 /* 477 * Copy the sigframe out to the user's stack. 478 */ 479 if (copyout(&sf, fp, sizeof(*fp)) != 0) { 480#ifdef DEBUG 481 printf("process %ld has trashed its stack\n", (long)p->p_pid); 482#endif 483 PROC_LOCK(p); 484 sigexit(td, SIGILL); 485 } 486 487 regs->tf_esp = (int)fp; 488 if (p->p_sysent->sv_sigcode_base != 0) { 489 regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode - 490 szosigcode; 491 } else { 492 /* a.out sysentvec does not use shared page */ 493 regs->tf_eip = p->p_sysent->sv_psstrings - szosigcode; 494 } 495 regs->tf_eflags &= ~(PSL_T | PSL_D); 496 regs->tf_cs = _ucodesel; 497 regs->tf_ds = _udatasel; 498 regs->tf_es = _udatasel; 499 regs->tf_fs = _udatasel; 500 load_gs(_udatasel); 501 regs->tf_ss = _udatasel; 502 PROC_LOCK(p); 503 mtx_lock(&psp->ps_mtx); 504} 505#endif /* COMPAT_43 */ 506 507#ifdef COMPAT_FREEBSD4 508static void 509freebsd4_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 510{ 511 struct sigframe4 sf, *sfp; 512 struct proc *p; 513 struct thread *td; 514 struct sigacts *psp; 515 struct trapframe *regs; 516 int sig; 517 int oonstack; 518 519 td = curthread; 520 p = td->td_proc; 521 PROC_LOCK_ASSERT(p, MA_OWNED); 522 sig = ksi->ksi_signo; 523 psp = p->p_sigacts; 524 mtx_assert(&psp->ps_mtx, MA_OWNED); 525 regs = td->td_frame; 526 oonstack = sigonstack(regs->tf_esp); 527 528 /* Save user context. */ 529 bzero(&sf, sizeof(sf)); 530 sf.sf_uc.uc_sigmask = *mask; 531 sf.sf_uc.uc_stack = td->td_sigstk; 532 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 533 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 534 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 535 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 536 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 537 bzero(sf.sf_uc.uc_mcontext.mc_fpregs, 538 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs)); 539 bzero(sf.sf_uc.uc_mcontext.__spare__, 540 sizeof(sf.sf_uc.uc_mcontext.__spare__)); 541 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__)); 542 543 /* Allocate space for the signal handler context. */ 544 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 545 SIGISMEMBER(psp->ps_sigonstack, sig)) { 546 sfp = (struct sigframe4 *)(td->td_sigstk.ss_sp + 547 td->td_sigstk.ss_size - sizeof(struct sigframe4)); 548#if defined(COMPAT_43) 549 td->td_sigstk.ss_flags |= SS_ONSTACK; 550#endif 551 } else 552 sfp = (struct sigframe4 *)regs->tf_esp - 1; 553 554 /* Translate the signal if appropriate. */ 555 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 556 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 557 558 /* Build the argument list for the signal handler. */ 559 sf.sf_signum = sig; 560 sf.sf_ucontext = (register_t)&sfp->sf_uc; 561 bzero(&sf.sf_si, sizeof(sf.sf_si)); 562 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 563 /* Signal handler installed with SA_SIGINFO. */ 564 sf.sf_siginfo = (register_t)&sfp->sf_si; 565 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 566 567 /* Fill in POSIX parts */ 568 sf.sf_si.si_signo = sig; 569 sf.sf_si.si_code = ksi->ksi_code; 570 sf.sf_si.si_addr = ksi->ksi_addr; 571 } else { 572 /* Old FreeBSD-style arguments. */ 573 sf.sf_siginfo = ksi->ksi_code; 574 sf.sf_addr = (register_t)ksi->ksi_addr; 575 sf.sf_ahu.sf_handler = catcher; 576 } 577 mtx_unlock(&psp->ps_mtx); 578 PROC_UNLOCK(p); 579 580 /* 581 * If we're a vm86 process, we want to save the segment registers. 582 * We also change eflags to be our emulated eflags, not the actual 583 * eflags. 584 */ 585 if (regs->tf_eflags & PSL_VM) { 586 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 587 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 588 589 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 590 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 591 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 592 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 593 594 if (vm86->vm86_has_vme == 0) 595 sf.sf_uc.uc_mcontext.mc_eflags = 596 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 597 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 598 599 /* 600 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 601 * syscalls made by the signal handler. This just avoids 602 * wasting time for our lazy fixup of such faults. PSL_NT 603 * does nothing in vm86 mode, but vm86 programs can set it 604 * almost legitimately in probes for old cpu types. 605 */ 606 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 607 } 608 609 /* 610 * Copy the sigframe out to the user's stack. 611 */ 612 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 613#ifdef DEBUG 614 printf("process %ld has trashed its stack\n", (long)p->p_pid); 615#endif 616 PROC_LOCK(p); 617 sigexit(td, SIGILL); 618 } 619 620 regs->tf_esp = (int)sfp; 621 regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode - 622 szfreebsd4_sigcode; 623 regs->tf_eflags &= ~(PSL_T | PSL_D); 624 regs->tf_cs = _ucodesel; 625 regs->tf_ds = _udatasel; 626 regs->tf_es = _udatasel; 627 regs->tf_fs = _udatasel; 628 regs->tf_ss = _udatasel; 629 PROC_LOCK(p); 630 mtx_lock(&psp->ps_mtx); 631} 632#endif /* COMPAT_FREEBSD4 */ 633 634void 635sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 636{ 637 struct sigframe sf, *sfp; 638 struct proc *p; 639 struct thread *td; 640 struct sigacts *psp; 641 char *sp; 642 struct trapframe *regs; 643 struct segment_descriptor *sdp; 644 char *xfpusave; 645 size_t xfpusave_len; 646 int sig; 647 int oonstack; 648 649 td = curthread; 650 p = td->td_proc; 651 PROC_LOCK_ASSERT(p, MA_OWNED); 652 sig = ksi->ksi_signo; 653 psp = p->p_sigacts; 654 mtx_assert(&psp->ps_mtx, MA_OWNED); 655#ifdef COMPAT_FREEBSD4 656 if (SIGISMEMBER(psp->ps_freebsd4, sig)) { 657 freebsd4_sendsig(catcher, ksi, mask); 658 return; 659 } 660#endif 661#ifdef COMPAT_43 662 if (SIGISMEMBER(psp->ps_osigset, sig)) { 663 osendsig(catcher, ksi, mask); 664 return; 665 } 666#endif 667 regs = td->td_frame; 668 oonstack = sigonstack(regs->tf_esp); 669 670#ifdef CPU_ENABLE_SSE 671 if (cpu_max_ext_state_size > sizeof(union savefpu) && use_xsave) { 672 xfpusave_len = cpu_max_ext_state_size - sizeof(union savefpu); 673 xfpusave = __builtin_alloca(xfpusave_len); 674 } else { 675#else 676 { 677#endif 678 xfpusave_len = 0; 679 xfpusave = NULL; 680 } 681 682 /* Save user context. */ 683 bzero(&sf, sizeof(sf)); 684 sf.sf_uc.uc_sigmask = *mask; 685 sf.sf_uc.uc_stack = td->td_sigstk; 686 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 687 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 688 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 689 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 690 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 691 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */ 692 get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len); 693 fpstate_drop(td); 694 /* 695 * Unconditionally fill the fsbase and gsbase into the mcontext. 696 */ 697 sdp = &td->td_pcb->pcb_fsd; 698 sf.sf_uc.uc_mcontext.mc_fsbase = sdp->sd_hibase << 24 | 699 sdp->sd_lobase; 700 sdp = &td->td_pcb->pcb_gsd; 701 sf.sf_uc.uc_mcontext.mc_gsbase = sdp->sd_hibase << 24 | 702 sdp->sd_lobase; 703 bzero(sf.sf_uc.uc_mcontext.mc_spare2, 704 sizeof(sf.sf_uc.uc_mcontext.mc_spare2)); 705 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__)); 706 707 /* Allocate space for the signal handler context. */ 708 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 709 SIGISMEMBER(psp->ps_sigonstack, sig)) { 710 sp = td->td_sigstk.ss_sp + td->td_sigstk.ss_size; 711#if defined(COMPAT_43) 712 td->td_sigstk.ss_flags |= SS_ONSTACK; 713#endif 714 } else 715 sp = (char *)regs->tf_esp - 128; 716 if (xfpusave != NULL) { 717 sp -= xfpusave_len; 718 sp = (char *)((unsigned int)sp & ~0x3F); 719 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp; 720 } 721 sp -= sizeof(struct sigframe); 722 723 /* Align to 16 bytes. */ 724 sfp = (struct sigframe *)((unsigned int)sp & ~0xF); 725 726 /* Translate the signal if appropriate. */ 727 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 728 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 729 730 /* Build the argument list for the signal handler. */ 731 sf.sf_signum = sig; 732 sf.sf_ucontext = (register_t)&sfp->sf_uc; 733 bzero(&sf.sf_si, sizeof(sf.sf_si)); 734 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 735 /* Signal handler installed with SA_SIGINFO. */ 736 sf.sf_siginfo = (register_t)&sfp->sf_si; 737 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 738 739 /* Fill in POSIX parts */ 740 sf.sf_si = ksi->ksi_info; 741 sf.sf_si.si_signo = sig; /* maybe a translated signal */ 742 } else { 743 /* Old FreeBSD-style arguments. */ 744 sf.sf_siginfo = ksi->ksi_code; 745 sf.sf_addr = (register_t)ksi->ksi_addr; 746 sf.sf_ahu.sf_handler = catcher; 747 } 748 mtx_unlock(&psp->ps_mtx); 749 PROC_UNLOCK(p); 750 751 /* 752 * If we're a vm86 process, we want to save the segment registers. 753 * We also change eflags to be our emulated eflags, not the actual 754 * eflags. 755 */ 756 if (regs->tf_eflags & PSL_VM) { 757 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 758 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 759 760 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 761 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 762 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 763 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 764 765 if (vm86->vm86_has_vme == 0) 766 sf.sf_uc.uc_mcontext.mc_eflags = 767 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 768 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 769 770 /* 771 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 772 * syscalls made by the signal handler. This just avoids 773 * wasting time for our lazy fixup of such faults. PSL_NT 774 * does nothing in vm86 mode, but vm86 programs can set it 775 * almost legitimately in probes for old cpu types. 776 */ 777 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 778 } 779 780 /* 781 * Copy the sigframe out to the user's stack. 782 */ 783 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 || 784 (xfpusave != NULL && copyout(xfpusave, 785 (void *)sf.sf_uc.uc_mcontext.mc_xfpustate, xfpusave_len) 786 != 0)) { 787#ifdef DEBUG 788 printf("process %ld has trashed its stack\n", (long)p->p_pid); 789#endif 790 PROC_LOCK(p); 791 sigexit(td, SIGILL); 792 } 793 794 regs->tf_esp = (int)sfp; 795 regs->tf_eip = p->p_sysent->sv_sigcode_base; 796 if (regs->tf_eip == 0) 797 regs->tf_eip = p->p_sysent->sv_psstrings - szsigcode; 798 regs->tf_eflags &= ~(PSL_T | PSL_D); 799 regs->tf_cs = _ucodesel; 800 regs->tf_ds = _udatasel; 801 regs->tf_es = _udatasel; 802 regs->tf_fs = _udatasel; 803 regs->tf_ss = _udatasel; 804 PROC_LOCK(p); 805 mtx_lock(&psp->ps_mtx); 806} 807 808/* 809 * System call to cleanup state after a signal 810 * has been taken. Reset signal mask and 811 * stack state from context left by sendsig (above). 812 * Return to previous pc and psl as specified by 813 * context left by sendsig. Check carefully to 814 * make sure that the user has not modified the 815 * state to gain improper privileges. 816 * 817 * MPSAFE 818 */ 819#ifdef COMPAT_43 820int 821osigreturn(td, uap) 822 struct thread *td; 823 struct osigreturn_args /* { 824 struct osigcontext *sigcntxp; 825 } */ *uap; 826{ 827 struct osigcontext sc; 828 struct trapframe *regs; 829 struct osigcontext *scp; 830 int eflags, error; 831 ksiginfo_t ksi; 832 833 regs = td->td_frame; 834 error = copyin(uap->sigcntxp, &sc, sizeof(sc)); 835 if (error != 0) 836 return (error); 837 scp = ≻ 838 eflags = scp->sc_ps; 839 if (eflags & PSL_VM) { 840 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 841 struct vm86_kernel *vm86; 842 843 /* 844 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 845 * set up the vm86 area, and we can't enter vm86 mode. 846 */ 847 if (td->td_pcb->pcb_ext == 0) 848 return (EINVAL); 849 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 850 if (vm86->vm86_inited == 0) 851 return (EINVAL); 852 853 /* Go back to user mode if both flags are set. */ 854 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) { 855 ksiginfo_init_trap(&ksi); 856 ksi.ksi_signo = SIGBUS; 857 ksi.ksi_code = BUS_OBJERR; 858 ksi.ksi_addr = (void *)regs->tf_eip; 859 trapsignal(td, &ksi); 860 } 861 862 if (vm86->vm86_has_vme) { 863 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 864 (eflags & VME_USERCHANGE) | PSL_VM; 865 } else { 866 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 867 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 868 (eflags & VM_USERCHANGE) | PSL_VM; 869 } 870 tf->tf_vm86_ds = scp->sc_ds; 871 tf->tf_vm86_es = scp->sc_es; 872 tf->tf_vm86_fs = scp->sc_fs; 873 tf->tf_vm86_gs = scp->sc_gs; 874 tf->tf_ds = _udatasel; 875 tf->tf_es = _udatasel; 876 tf->tf_fs = _udatasel; 877 } else { 878 /* 879 * Don't allow users to change privileged or reserved flags. 880 */ 881 if (!EFL_SECURE(eflags, regs->tf_eflags)) { 882 return (EINVAL); 883 } 884 885 /* 886 * Don't allow users to load a valid privileged %cs. Let the 887 * hardware check for invalid selectors, excess privilege in 888 * other selectors, invalid %eip's and invalid %esp's. 889 */ 890 if (!CS_SECURE(scp->sc_cs)) { 891 ksiginfo_init_trap(&ksi); 892 ksi.ksi_signo = SIGBUS; 893 ksi.ksi_code = BUS_OBJERR; 894 ksi.ksi_trapno = T_PROTFLT; 895 ksi.ksi_addr = (void *)regs->tf_eip; 896 trapsignal(td, &ksi); 897 return (EINVAL); 898 } 899 regs->tf_ds = scp->sc_ds; 900 regs->tf_es = scp->sc_es; 901 regs->tf_fs = scp->sc_fs; 902 } 903 904 /* Restore remaining registers. */ 905 regs->tf_eax = scp->sc_eax; 906 regs->tf_ebx = scp->sc_ebx; 907 regs->tf_ecx = scp->sc_ecx; 908 regs->tf_edx = scp->sc_edx; 909 regs->tf_esi = scp->sc_esi; 910 regs->tf_edi = scp->sc_edi; 911 regs->tf_cs = scp->sc_cs; 912 regs->tf_ss = scp->sc_ss; 913 regs->tf_isp = scp->sc_isp; 914 regs->tf_ebp = scp->sc_fp; 915 regs->tf_esp = scp->sc_sp; 916 regs->tf_eip = scp->sc_pc; 917 regs->tf_eflags = eflags; 918 919#if defined(COMPAT_43) 920 if (scp->sc_onstack & 1) 921 td->td_sigstk.ss_flags |= SS_ONSTACK; 922 else 923 td->td_sigstk.ss_flags &= ~SS_ONSTACK; 924#endif 925 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL, 926 SIGPROCMASK_OLD); 927 return (EJUSTRETURN); 928} 929#endif /* COMPAT_43 */ 930 931#ifdef COMPAT_FREEBSD4 932/* 933 * MPSAFE 934 */ 935int 936freebsd4_sigreturn(td, uap) 937 struct thread *td; 938 struct freebsd4_sigreturn_args /* { 939 const ucontext4 *sigcntxp; 940 } */ *uap; 941{ 942 struct ucontext4 uc; 943 struct trapframe *regs; 944 struct ucontext4 *ucp; 945 int cs, eflags, error; 946 ksiginfo_t ksi; 947 948 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 949 if (error != 0) 950 return (error); 951 ucp = &uc; 952 regs = td->td_frame; 953 eflags = ucp->uc_mcontext.mc_eflags; 954 if (eflags & PSL_VM) { 955 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 956 struct vm86_kernel *vm86; 957 958 /* 959 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 960 * set up the vm86 area, and we can't enter vm86 mode. 961 */ 962 if (td->td_pcb->pcb_ext == 0) 963 return (EINVAL); 964 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 965 if (vm86->vm86_inited == 0) 966 return (EINVAL); 967 968 /* Go back to user mode if both flags are set. */ 969 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) { 970 ksiginfo_init_trap(&ksi); 971 ksi.ksi_signo = SIGBUS; 972 ksi.ksi_code = BUS_OBJERR; 973 ksi.ksi_addr = (void *)regs->tf_eip; 974 trapsignal(td, &ksi); 975 } 976 if (vm86->vm86_has_vme) { 977 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 978 (eflags & VME_USERCHANGE) | PSL_VM; 979 } else { 980 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 981 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 982 (eflags & VM_USERCHANGE) | PSL_VM; 983 } 984 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 985 tf->tf_eflags = eflags; 986 tf->tf_vm86_ds = tf->tf_ds; 987 tf->tf_vm86_es = tf->tf_es; 988 tf->tf_vm86_fs = tf->tf_fs; 989 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 990 tf->tf_ds = _udatasel; 991 tf->tf_es = _udatasel; 992 tf->tf_fs = _udatasel; 993 } else { 994 /* 995 * Don't allow users to change privileged or reserved flags. 996 */ 997 if (!EFL_SECURE(eflags, regs->tf_eflags)) { 998 uprintf("pid %d (%s): freebsd4_sigreturn eflags = 0x%x\n", 999 td->td_proc->p_pid, td->td_name, eflags); 1000 return (EINVAL); 1001 } 1002 1003 /* 1004 * Don't allow users to load a valid privileged %cs. Let the 1005 * hardware check for invalid selectors, excess privilege in 1006 * other selectors, invalid %eip's and invalid %esp's. 1007 */ 1008 cs = ucp->uc_mcontext.mc_cs; 1009 if (!CS_SECURE(cs)) { 1010 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n", 1011 td->td_proc->p_pid, td->td_name, cs); 1012 ksiginfo_init_trap(&ksi); 1013 ksi.ksi_signo = SIGBUS; 1014 ksi.ksi_code = BUS_OBJERR; 1015 ksi.ksi_trapno = T_PROTFLT; 1016 ksi.ksi_addr = (void *)regs->tf_eip; 1017 trapsignal(td, &ksi); 1018 return (EINVAL); 1019 } 1020 1021 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 1022 } 1023 1024#if defined(COMPAT_43) 1025 if (ucp->uc_mcontext.mc_onstack & 1) 1026 td->td_sigstk.ss_flags |= SS_ONSTACK; 1027 else 1028 td->td_sigstk.ss_flags &= ~SS_ONSTACK; 1029#endif 1030 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0); 1031 return (EJUSTRETURN); 1032} 1033#endif /* COMPAT_FREEBSD4 */ 1034 1035/* 1036 * MPSAFE 1037 */ 1038int 1039sys_sigreturn(td, uap) 1040 struct thread *td; 1041 struct sigreturn_args /* { 1042 const struct __ucontext *sigcntxp; 1043 } */ *uap; 1044{ 1045 ucontext_t uc; 1046 struct proc *p; 1047 struct trapframe *regs; 1048 ucontext_t *ucp; 1049 char *xfpustate; 1050 size_t xfpustate_len; 1051 int cs, eflags, error, ret; 1052 ksiginfo_t ksi; 1053 1054 p = td->td_proc; 1055 1056 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 1057 if (error != 0) 1058 return (error); 1059 ucp = &uc; 1060 if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) { 1061 uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid, 1062 td->td_name, ucp->uc_mcontext.mc_flags); 1063 return (EINVAL); 1064 } 1065 regs = td->td_frame; 1066 eflags = ucp->uc_mcontext.mc_eflags; 1067 if (eflags & PSL_VM) { 1068 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 1069 struct vm86_kernel *vm86; 1070 1071 /* 1072 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 1073 * set up the vm86 area, and we can't enter vm86 mode. 1074 */ 1075 if (td->td_pcb->pcb_ext == 0) 1076 return (EINVAL); 1077 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 1078 if (vm86->vm86_inited == 0) 1079 return (EINVAL); 1080 1081 /* Go back to user mode if both flags are set. */ 1082 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) { 1083 ksiginfo_init_trap(&ksi); 1084 ksi.ksi_signo = SIGBUS; 1085 ksi.ksi_code = BUS_OBJERR; 1086 ksi.ksi_addr = (void *)regs->tf_eip; 1087 trapsignal(td, &ksi); 1088 } 1089 1090 if (vm86->vm86_has_vme) { 1091 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 1092 (eflags & VME_USERCHANGE) | PSL_VM; 1093 } else { 1094 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 1095 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 1096 (eflags & VM_USERCHANGE) | PSL_VM; 1097 } 1098 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 1099 tf->tf_eflags = eflags; 1100 tf->tf_vm86_ds = tf->tf_ds; 1101 tf->tf_vm86_es = tf->tf_es; 1102 tf->tf_vm86_fs = tf->tf_fs; 1103 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 1104 tf->tf_ds = _udatasel; 1105 tf->tf_es = _udatasel; 1106 tf->tf_fs = _udatasel; 1107 } else { 1108 /* 1109 * Don't allow users to change privileged or reserved flags. 1110 */ 1111 if (!EFL_SECURE(eflags, regs->tf_eflags)) { 1112 uprintf("pid %d (%s): sigreturn eflags = 0x%x\n", 1113 td->td_proc->p_pid, td->td_name, eflags); 1114 return (EINVAL); 1115 } 1116 1117 /* 1118 * Don't allow users to load a valid privileged %cs. Let the 1119 * hardware check for invalid selectors, excess privilege in 1120 * other selectors, invalid %eip's and invalid %esp's. 1121 */ 1122 cs = ucp->uc_mcontext.mc_cs; 1123 if (!CS_SECURE(cs)) { 1124 uprintf("pid %d (%s): sigreturn cs = 0x%x\n", 1125 td->td_proc->p_pid, td->td_name, cs); 1126 ksiginfo_init_trap(&ksi); 1127 ksi.ksi_signo = SIGBUS; 1128 ksi.ksi_code = BUS_OBJERR; 1129 ksi.ksi_trapno = T_PROTFLT; 1130 ksi.ksi_addr = (void *)regs->tf_eip; 1131 trapsignal(td, &ksi); 1132 return (EINVAL); 1133 } 1134 1135 if ((uc.uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) { 1136 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len; 1137 if (xfpustate_len > cpu_max_ext_state_size - 1138 sizeof(union savefpu)) { 1139 uprintf( 1140 "pid %d (%s): sigreturn xfpusave_len = 0x%zx\n", 1141 p->p_pid, td->td_name, xfpustate_len); 1142 return (EINVAL); 1143 } 1144 xfpustate = __builtin_alloca(xfpustate_len); 1145 error = copyin((const void *)uc.uc_mcontext.mc_xfpustate, 1146 xfpustate, xfpustate_len); 1147 if (error != 0) { 1148 uprintf( 1149 "pid %d (%s): sigreturn copying xfpustate failed\n", 1150 p->p_pid, td->td_name); 1151 return (error); 1152 } 1153 } else { 1154 xfpustate = NULL; 1155 xfpustate_len = 0; 1156 } 1157 ret = set_fpcontext(td, &ucp->uc_mcontext, xfpustate, 1158 xfpustate_len); 1159 if (ret != 0) 1160 return (ret); 1161 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 1162 } 1163 1164#if defined(COMPAT_43) 1165 if (ucp->uc_mcontext.mc_onstack & 1) 1166 td->td_sigstk.ss_flags |= SS_ONSTACK; 1167 else 1168 td->td_sigstk.ss_flags &= ~SS_ONSTACK; 1169#endif 1170 1171 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0); 1172 return (EJUSTRETURN); 1173} 1174 1175/* 1176 * Machine dependent boot() routine 1177 * 1178 * I haven't seen anything to put here yet 1179 * Possibly some stuff might be grafted back here from boot() 1180 */ 1181void 1182cpu_boot(int howto) 1183{ 1184} 1185 1186/* 1187 * Flush the D-cache for non-DMA I/O so that the I-cache can 1188 * be made coherent later. 1189 */ 1190void 1191cpu_flush_dcache(void *ptr, size_t len) 1192{ 1193 /* Not applicable */ 1194} 1195 1196/* Get current clock frequency for the given cpu id. */ 1197int 1198cpu_est_clockrate(int cpu_id, uint64_t *rate) 1199{ 1200 uint64_t tsc1, tsc2; 1201 uint64_t acnt, mcnt, perf; 1202 register_t reg; 1203 1204 if (pcpu_find(cpu_id) == NULL || rate == NULL) 1205 return (EINVAL); 1206 if ((cpu_feature & CPUID_TSC) == 0) 1207 return (EOPNOTSUPP); 1208 1209 /* 1210 * If TSC is P-state invariant and APERF/MPERF MSRs do not exist, 1211 * DELAY(9) based logic fails. 1212 */ 1213 if (tsc_is_invariant && !tsc_perf_stat) 1214 return (EOPNOTSUPP); 1215 1216#ifdef SMP 1217 if (smp_cpus > 1) { 1218 /* Schedule ourselves on the indicated cpu. */ 1219 thread_lock(curthread); 1220 sched_bind(curthread, cpu_id); 1221 thread_unlock(curthread); 1222 } 1223#endif 1224 1225 /* Calibrate by measuring a short delay. */ 1226 reg = intr_disable(); 1227 if (tsc_is_invariant) { 1228 wrmsr(MSR_MPERF, 0); 1229 wrmsr(MSR_APERF, 0); 1230 tsc1 = rdtsc(); 1231 DELAY(1000); 1232 mcnt = rdmsr(MSR_MPERF); 1233 acnt = rdmsr(MSR_APERF); 1234 tsc2 = rdtsc(); 1235 intr_restore(reg); 1236 perf = 1000 * acnt / mcnt; 1237 *rate = (tsc2 - tsc1) * perf; 1238 } else { 1239 tsc1 = rdtsc(); 1240 DELAY(1000); 1241 tsc2 = rdtsc(); 1242 intr_restore(reg); 1243 *rate = (tsc2 - tsc1) * 1000; 1244 } 1245 1246#ifdef SMP 1247 if (smp_cpus > 1) { 1248 thread_lock(curthread); 1249 sched_unbind(curthread); 1250 thread_unlock(curthread); 1251 } 1252#endif 1253 1254 return (0); 1255} 1256 1257#ifdef XEN 1258 1259static void 1260idle_block(void) 1261{ 1262 1263 HYPERVISOR_sched_op(SCHEDOP_block, 0); 1264} 1265 1266void 1267cpu_halt(void) 1268{ 1269 HYPERVISOR_shutdown(SHUTDOWN_poweroff); 1270} 1271 1272int scheduler_running; 1273 1274static void 1275cpu_idle_hlt(sbintime_t sbt) 1276{ 1277 1278 scheduler_running = 1; 1279 enable_intr(); 1280 idle_block(); 1281} 1282 1283#else 1284/* 1285 * Shutdown the CPU as much as possible 1286 */ 1287void 1288cpu_halt(void) 1289{ 1290 for (;;) 1291 halt(); 1292} 1293 1294#endif 1295 1296void (*cpu_idle_hook)(sbintime_t) = NULL; /* ACPI idle hook. */ 1297static int cpu_ident_amdc1e = 0; /* AMD C1E supported. */ 1298static int idle_mwait = 1; /* Use MONITOR/MWAIT for short idle. */ 1299TUNABLE_INT("machdep.idle_mwait", &idle_mwait); 1300SYSCTL_INT(_machdep, OID_AUTO, idle_mwait, CTLFLAG_RW, &idle_mwait, 1301 0, "Use MONITOR/MWAIT for short idle"); 1302 1303#define STATE_RUNNING 0x0 1304#define STATE_MWAIT 0x1 1305#define STATE_SLEEPING 0x2 1306 1307#ifndef PC98 1308static void 1309cpu_idle_acpi(sbintime_t sbt) 1310{ 1311 int *state; 1312 1313 state = (int *)PCPU_PTR(monitorbuf); 1314 *state = STATE_SLEEPING; 1315 1316 /* See comments in cpu_idle_hlt(). */ 1317 disable_intr(); 1318 if (sched_runnable()) 1319 enable_intr(); 1320 else if (cpu_idle_hook) 1321 cpu_idle_hook(sbt); 1322 else 1323 __asm __volatile("sti; hlt"); 1324 *state = STATE_RUNNING; 1325} 1326#endif /* !PC98 */ 1327 1328#ifndef XEN 1329static void 1330cpu_idle_hlt(sbintime_t sbt) 1331{ 1332 int *state; 1333 1334 state = (int *)PCPU_PTR(monitorbuf); 1335 *state = STATE_SLEEPING; 1336 1337 /* 1338 * Since we may be in a critical section from cpu_idle(), if 1339 * an interrupt fires during that critical section we may have 1340 * a pending preemption. If the CPU halts, then that thread 1341 * may not execute until a later interrupt awakens the CPU. 1342 * To handle this race, check for a runnable thread after 1343 * disabling interrupts and immediately return if one is 1344 * found. Also, we must absolutely guarentee that hlt is 1345 * the next instruction after sti. This ensures that any 1346 * interrupt that fires after the call to disable_intr() will 1347 * immediately awaken the CPU from hlt. Finally, please note 1348 * that on x86 this works fine because of interrupts enabled only 1349 * after the instruction following sti takes place, while IF is set 1350 * to 1 immediately, allowing hlt instruction to acknowledge the 1351 * interrupt. 1352 */ 1353 disable_intr(); 1354 if (sched_runnable()) 1355 enable_intr(); 1356 else 1357 __asm __volatile("sti; hlt"); 1358 *state = STATE_RUNNING; 1359} 1360#endif 1361 1362static void 1363cpu_idle_mwait(sbintime_t sbt) 1364{ 1365 int *state; 1366 1367 state = (int *)PCPU_PTR(monitorbuf); 1368 *state = STATE_MWAIT; 1369 1370 /* See comments in cpu_idle_hlt(). */ 1371 disable_intr(); 1372 if (sched_runnable()) { 1373 enable_intr(); 1374 *state = STATE_RUNNING; 1375 return; 1376 } 1377 cpu_monitor(state, 0, 0); 1378 if (*state == STATE_MWAIT) 1379 __asm __volatile("sti; mwait" : : "a" (MWAIT_C1), "c" (0)); 1380 else 1381 enable_intr(); 1382 *state = STATE_RUNNING; 1383} 1384 1385static void 1386cpu_idle_spin(sbintime_t sbt) 1387{ 1388 int *state; 1389 int i; 1390 1391 state = (int *)PCPU_PTR(monitorbuf); 1392 *state = STATE_RUNNING; 1393 1394 /* 1395 * The sched_runnable() call is racy but as long as there is 1396 * a loop missing it one time will have just a little impact if any 1397 * (and it is much better than missing the check at all). 1398 */ 1399 for (i = 0; i < 1000; i++) { 1400 if (sched_runnable()) 1401 return; 1402 cpu_spinwait(); 1403 } 1404} 1405 1406/* 1407 * C1E renders the local APIC timer dead, so we disable it by 1408 * reading the Interrupt Pending Message register and clearing 1409 * both C1eOnCmpHalt (bit 28) and SmiOnCmpHalt (bit 27). 1410 * 1411 * Reference: 1412 * "BIOS and Kernel Developer's Guide for AMD NPT Family 0Fh Processors" 1413 * #32559 revision 3.00+ 1414 */ 1415#define MSR_AMDK8_IPM 0xc0010055 1416#define AMDK8_SMIONCMPHALT (1ULL << 27) 1417#define AMDK8_C1EONCMPHALT (1ULL << 28) 1418#define AMDK8_CMPHALT (AMDK8_SMIONCMPHALT | AMDK8_C1EONCMPHALT) 1419 1420static void 1421cpu_probe_amdc1e(void) 1422{ 1423 1424 /* 1425 * Detect the presence of C1E capability mostly on latest 1426 * dual-cores (or future) k8 family. 1427 */ 1428 if (cpu_vendor_id == CPU_VENDOR_AMD && 1429 (cpu_id & 0x00000f00) == 0x00000f00 && 1430 (cpu_id & 0x0fff0000) >= 0x00040000) { 1431 cpu_ident_amdc1e = 1; 1432 } 1433} 1434 1435#if defined(PC98) || defined(XEN) 1436void (*cpu_idle_fn)(sbintime_t) = cpu_idle_hlt; 1437#else 1438void (*cpu_idle_fn)(sbintime_t) = cpu_idle_acpi; 1439#endif 1440 1441void 1442cpu_idle(int busy) 1443{ 1444#ifndef XEN 1445 uint64_t msr; 1446#endif 1447 sbintime_t sbt = -1; 1448 1449 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d", 1450 busy, curcpu); 1451#if defined(MP_WATCHDOG) && !defined(XEN) 1452 ap_watchdog(PCPU_GET(cpuid)); 1453#endif 1454#ifndef XEN 1455 /* If we are busy - try to use fast methods. */ 1456 if (busy) { 1457 if ((cpu_feature2 & CPUID2_MON) && idle_mwait) { 1458 cpu_idle_mwait(busy); 1459 goto out; 1460 } 1461 } 1462#endif 1463 1464 /* If we have time - switch timers into idle mode. */ 1465 if (!busy) { 1466 critical_enter(); 1467 sbt = cpu_idleclock(); 1468 } 1469 1470#ifndef XEN 1471 /* Apply AMD APIC timer C1E workaround. */ 1472 if (cpu_ident_amdc1e && cpu_disable_c3_sleep) { 1473 msr = rdmsr(MSR_AMDK8_IPM); 1474 if (msr & AMDK8_CMPHALT) 1475 wrmsr(MSR_AMDK8_IPM, msr & ~AMDK8_CMPHALT); 1476 } 1477#endif 1478 1479 /* Call main idle method. */ 1480 cpu_idle_fn(sbt); 1481 1482 /* Switch timers mack into active mode. */ 1483 if (!busy) { 1484 cpu_activeclock(); 1485 critical_exit(); 1486 } 1487#ifndef XEN 1488out: 1489#endif 1490 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d done", 1491 busy, curcpu); 1492} 1493 1494int 1495cpu_idle_wakeup(int cpu) 1496{ 1497 struct pcpu *pcpu; 1498 int *state; 1499 1500 pcpu = pcpu_find(cpu); 1501 state = (int *)pcpu->pc_monitorbuf; 1502 /* 1503 * This doesn't need to be atomic since missing the race will 1504 * simply result in unnecessary IPIs. 1505 */ 1506 if (*state == STATE_SLEEPING) 1507 return (0); 1508 if (*state == STATE_MWAIT) 1509 *state = STATE_RUNNING; 1510 return (1); 1511} 1512 1513/* 1514 * Ordered by speed/power consumption. 1515 */ 1516struct { 1517 void *id_fn; 1518 char *id_name; 1519} idle_tbl[] = { 1520 { cpu_idle_spin, "spin" }, 1521 { cpu_idle_mwait, "mwait" }, 1522 { cpu_idle_hlt, "hlt" }, 1523#ifndef PC98 1524 { cpu_idle_acpi, "acpi" }, 1525#endif 1526 { NULL, NULL } 1527}; 1528 1529static int 1530idle_sysctl_available(SYSCTL_HANDLER_ARGS) 1531{ 1532 char *avail, *p; 1533 int error; 1534 int i; 1535 1536 avail = malloc(256, M_TEMP, M_WAITOK); 1537 p = avail; 1538 for (i = 0; idle_tbl[i].id_name != NULL; i++) { 1539 if (strstr(idle_tbl[i].id_name, "mwait") && 1540 (cpu_feature2 & CPUID2_MON) == 0) 1541 continue; 1542#ifndef PC98 1543 if (strcmp(idle_tbl[i].id_name, "acpi") == 0 && 1544 cpu_idle_hook == NULL) 1545 continue; 1546#endif 1547 p += sprintf(p, "%s%s", p != avail ? ", " : "", 1548 idle_tbl[i].id_name); 1549 } 1550 error = sysctl_handle_string(oidp, avail, 0, req); 1551 free(avail, M_TEMP); 1552 return (error); 1553} 1554 1555SYSCTL_PROC(_machdep, OID_AUTO, idle_available, CTLTYPE_STRING | CTLFLAG_RD, 1556 0, 0, idle_sysctl_available, "A", "list of available idle functions"); 1557 1558static int 1559idle_sysctl(SYSCTL_HANDLER_ARGS) 1560{ 1561 char buf[16]; 1562 int error; 1563 char *p; 1564 int i; 1565 1566 p = "unknown"; 1567 for (i = 0; idle_tbl[i].id_name != NULL; i++) { 1568 if (idle_tbl[i].id_fn == cpu_idle_fn) { 1569 p = idle_tbl[i].id_name; 1570 break; 1571 } 1572 } 1573 strncpy(buf, p, sizeof(buf)); 1574 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 1575 if (error != 0 || req->newptr == NULL) 1576 return (error); 1577 for (i = 0; idle_tbl[i].id_name != NULL; i++) { 1578 if (strstr(idle_tbl[i].id_name, "mwait") && 1579 (cpu_feature2 & CPUID2_MON) == 0) 1580 continue; 1581#ifndef PC98 1582 if (strcmp(idle_tbl[i].id_name, "acpi") == 0 && 1583 cpu_idle_hook == NULL) 1584 continue; 1585#endif 1586 if (strcmp(idle_tbl[i].id_name, buf)) 1587 continue; 1588 cpu_idle_fn = idle_tbl[i].id_fn; 1589 return (0); 1590 } 1591 return (EINVAL); 1592} 1593 1594SYSCTL_PROC(_machdep, OID_AUTO, idle, CTLTYPE_STRING | CTLFLAG_RW, 0, 0, 1595 idle_sysctl, "A", "currently selected idle function"); 1596 1597/* 1598 * Reset registers to default values on exec. 1599 */ 1600void 1601exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 1602{ 1603 struct trapframe *regs = td->td_frame; 1604 struct pcb *pcb = td->td_pcb; 1605 1606 /* Reset pc->pcb_gs and %gs before possibly invalidating it. */ 1607 pcb->pcb_gs = _udatasel; 1608 load_gs(_udatasel); 1609 1610 mtx_lock_spin(&dt_lock); 1611 if (td->td_proc->p_md.md_ldt) 1612 user_ldt_free(td); 1613 else 1614 mtx_unlock_spin(&dt_lock); 1615 1616 bzero((char *)regs, sizeof(struct trapframe)); 1617 regs->tf_eip = imgp->entry_addr; 1618 regs->tf_esp = stack; 1619 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1620 regs->tf_ss = _udatasel; 1621 regs->tf_ds = _udatasel; 1622 regs->tf_es = _udatasel; 1623 regs->tf_fs = _udatasel; 1624 regs->tf_cs = _ucodesel; 1625 1626 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1627 regs->tf_ebx = imgp->ps_strings; 1628 1629 /* 1630 * Reset the hardware debug registers if they were in use. 1631 * They won't have any meaning for the newly exec'd process. 1632 */ 1633 if (pcb->pcb_flags & PCB_DBREGS) { 1634 pcb->pcb_dr0 = 0; 1635 pcb->pcb_dr1 = 0; 1636 pcb->pcb_dr2 = 0; 1637 pcb->pcb_dr3 = 0; 1638 pcb->pcb_dr6 = 0; 1639 pcb->pcb_dr7 = 0; 1640 if (pcb == curpcb) { 1641 /* 1642 * Clear the debug registers on the running 1643 * CPU, otherwise they will end up affecting 1644 * the next process we switch to. 1645 */ 1646 reset_dbregs(); 1647 } 1648 pcb->pcb_flags &= ~PCB_DBREGS; 1649 } 1650 1651 pcb->pcb_initial_npxcw = __INITIAL_NPXCW__; 1652 1653 /* 1654 * Drop the FP state if we hold it, so that the process gets a 1655 * clean FP state if it uses the FPU again. 1656 */ 1657 fpstate_drop(td); 1658 1659 /* 1660 * XXX - Linux emulator 1661 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1662 * on it. 1663 */ 1664 td->td_retval[1] = 0; 1665} 1666 1667void 1668cpu_setregs(void) 1669{ 1670 unsigned int cr0; 1671 1672 cr0 = rcr0(); 1673 1674 /* 1675 * CR0_MP, CR0_NE and CR0_TS are set for NPX (FPU) support: 1676 * 1677 * Prepare to trap all ESC (i.e., NPX) instructions and all WAIT 1678 * instructions. We must set the CR0_MP bit and use the CR0_TS 1679 * bit to control the trap, because setting the CR0_EM bit does 1680 * not cause WAIT instructions to trap. It's important to trap 1681 * WAIT instructions - otherwise the "wait" variants of no-wait 1682 * control instructions would degenerate to the "no-wait" variants 1683 * after FP context switches but work correctly otherwise. It's 1684 * particularly important to trap WAITs when there is no NPX - 1685 * otherwise the "wait" variants would always degenerate. 1686 * 1687 * Try setting CR0_NE to get correct error reporting on 486DX's. 1688 * Setting it should fail or do nothing on lesser processors. 1689 */ 1690 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM; 1691 load_cr0(cr0); 1692 load_gs(_udatasel); 1693} 1694 1695u_long bootdev; /* not a struct cdev *- encoding is different */ 1696SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev, 1697 CTLFLAG_RD, &bootdev, 0, "Maybe the Boot device (not in struct cdev *format)"); 1698 1699static char bootmethod[16] = "BIOS"; 1700SYSCTL_STRING(_machdep, OID_AUTO, bootmethod, CTLFLAG_RD, bootmethod, 0, 1701 "System firmware boot method"); 1702 1703/* 1704 * Initialize 386 and configure to run kernel 1705 */ 1706 1707/* 1708 * Initialize segments & interrupt table 1709 */ 1710 1711int _default_ldt; 1712 1713#ifdef XEN 1714union descriptor *gdt; 1715union descriptor *ldt; 1716#else 1717union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1718union descriptor ldt[NLDT]; /* local descriptor table */ 1719#endif 1720static struct gate_descriptor idt0[NIDT]; 1721struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1722struct region_descriptor r_gdt, r_idt; /* table descriptors */ 1723struct mtx dt_lock; /* lock for GDT and LDT */ 1724 1725static struct i386tss dblfault_tss; 1726static char dblfault_stack[PAGE_SIZE]; 1727 1728extern vm_offset_t proc0kstack; 1729 1730 1731/* 1732 * software prototypes -- in more palatable form. 1733 * 1734 * GCODE_SEL through GUDATA_SEL must be in this order for syscall/sysret 1735 * GUFS_SEL and GUGS_SEL must be in this order (swtch.s knows it) 1736 */ 1737struct soft_segment_descriptor gdt_segs[] = { 1738/* GNULL_SEL 0 Null Descriptor */ 1739{ .ssd_base = 0x0, 1740 .ssd_limit = 0x0, 1741 .ssd_type = 0, 1742 .ssd_dpl = SEL_KPL, 1743 .ssd_p = 0, 1744 .ssd_xx = 0, .ssd_xx1 = 0, 1745 .ssd_def32 = 0, 1746 .ssd_gran = 0 }, 1747/* GPRIV_SEL 1 SMP Per-Processor Private Data Descriptor */ 1748{ .ssd_base = 0x0, 1749 .ssd_limit = 0xfffff, 1750 .ssd_type = SDT_MEMRWA, 1751 .ssd_dpl = SEL_KPL, 1752 .ssd_p = 1, 1753 .ssd_xx = 0, .ssd_xx1 = 0, 1754 .ssd_def32 = 1, 1755 .ssd_gran = 1 }, 1756/* GUFS_SEL 2 %fs Descriptor for user */ 1757{ .ssd_base = 0x0, 1758 .ssd_limit = 0xfffff, 1759 .ssd_type = SDT_MEMRWA, 1760 .ssd_dpl = SEL_UPL, 1761 .ssd_p = 1, 1762 .ssd_xx = 0, .ssd_xx1 = 0, 1763 .ssd_def32 = 1, 1764 .ssd_gran = 1 }, 1765/* GUGS_SEL 3 %gs Descriptor for user */ 1766{ .ssd_base = 0x0, 1767 .ssd_limit = 0xfffff, 1768 .ssd_type = SDT_MEMRWA, 1769 .ssd_dpl = SEL_UPL, 1770 .ssd_p = 1, 1771 .ssd_xx = 0, .ssd_xx1 = 0, 1772 .ssd_def32 = 1, 1773 .ssd_gran = 1 }, 1774/* GCODE_SEL 4 Code Descriptor for kernel */ 1775{ .ssd_base = 0x0, 1776 .ssd_limit = 0xfffff, 1777 .ssd_type = SDT_MEMERA, 1778 .ssd_dpl = SEL_KPL, 1779 .ssd_p = 1, 1780 .ssd_xx = 0, .ssd_xx1 = 0, 1781 .ssd_def32 = 1, 1782 .ssd_gran = 1 }, 1783/* GDATA_SEL 5 Data Descriptor for kernel */ 1784{ .ssd_base = 0x0, 1785 .ssd_limit = 0xfffff, 1786 .ssd_type = SDT_MEMRWA, 1787 .ssd_dpl = SEL_KPL, 1788 .ssd_p = 1, 1789 .ssd_xx = 0, .ssd_xx1 = 0, 1790 .ssd_def32 = 1, 1791 .ssd_gran = 1 }, 1792/* GUCODE_SEL 6 Code Descriptor for user */ 1793{ .ssd_base = 0x0, 1794 .ssd_limit = 0xfffff, 1795 .ssd_type = SDT_MEMERA, 1796 .ssd_dpl = SEL_UPL, 1797 .ssd_p = 1, 1798 .ssd_xx = 0, .ssd_xx1 = 0, 1799 .ssd_def32 = 1, 1800 .ssd_gran = 1 }, 1801/* GUDATA_SEL 7 Data Descriptor for user */ 1802{ .ssd_base = 0x0, 1803 .ssd_limit = 0xfffff, 1804 .ssd_type = SDT_MEMRWA, 1805 .ssd_dpl = SEL_UPL, 1806 .ssd_p = 1, 1807 .ssd_xx = 0, .ssd_xx1 = 0, 1808 .ssd_def32 = 1, 1809 .ssd_gran = 1 }, 1810/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1811{ .ssd_base = 0x400, 1812 .ssd_limit = 0xfffff, 1813 .ssd_type = SDT_MEMRWA, 1814 .ssd_dpl = SEL_KPL, 1815 .ssd_p = 1, 1816 .ssd_xx = 0, .ssd_xx1 = 0, 1817 .ssd_def32 = 1, 1818 .ssd_gran = 1 }, 1819#ifndef XEN 1820/* GPROC0_SEL 9 Proc 0 Tss Descriptor */ 1821{ 1822 .ssd_base = 0x0, 1823 .ssd_limit = sizeof(struct i386tss)-1, 1824 .ssd_type = SDT_SYS386TSS, 1825 .ssd_dpl = 0, 1826 .ssd_p = 1, 1827 .ssd_xx = 0, .ssd_xx1 = 0, 1828 .ssd_def32 = 0, 1829 .ssd_gran = 0 }, 1830/* GLDT_SEL 10 LDT Descriptor */ 1831{ .ssd_base = (int) ldt, 1832 .ssd_limit = sizeof(ldt)-1, 1833 .ssd_type = SDT_SYSLDT, 1834 .ssd_dpl = SEL_UPL, 1835 .ssd_p = 1, 1836 .ssd_xx = 0, .ssd_xx1 = 0, 1837 .ssd_def32 = 0, 1838 .ssd_gran = 0 }, 1839/* GUSERLDT_SEL 11 User LDT Descriptor per process */ 1840{ .ssd_base = (int) ldt, 1841 .ssd_limit = (512 * sizeof(union descriptor)-1), 1842 .ssd_type = SDT_SYSLDT, 1843 .ssd_dpl = 0, 1844 .ssd_p = 1, 1845 .ssd_xx = 0, .ssd_xx1 = 0, 1846 .ssd_def32 = 0, 1847 .ssd_gran = 0 }, 1848/* GPANIC_SEL 12 Panic Tss Descriptor */ 1849{ .ssd_base = (int) &dblfault_tss, 1850 .ssd_limit = sizeof(struct i386tss)-1, 1851 .ssd_type = SDT_SYS386TSS, 1852 .ssd_dpl = 0, 1853 .ssd_p = 1, 1854 .ssd_xx = 0, .ssd_xx1 = 0, 1855 .ssd_def32 = 0, 1856 .ssd_gran = 0 }, 1857/* GBIOSCODE32_SEL 13 BIOS 32-bit interface (32bit Code) */ 1858{ .ssd_base = 0, 1859 .ssd_limit = 0xfffff, 1860 .ssd_type = SDT_MEMERA, 1861 .ssd_dpl = 0, 1862 .ssd_p = 1, 1863 .ssd_xx = 0, .ssd_xx1 = 0, 1864 .ssd_def32 = 0, 1865 .ssd_gran = 1 }, 1866/* GBIOSCODE16_SEL 14 BIOS 32-bit interface (16bit Code) */ 1867{ .ssd_base = 0, 1868 .ssd_limit = 0xfffff, 1869 .ssd_type = SDT_MEMERA, 1870 .ssd_dpl = 0, 1871 .ssd_p = 1, 1872 .ssd_xx = 0, .ssd_xx1 = 0, 1873 .ssd_def32 = 0, 1874 .ssd_gran = 1 }, 1875/* GBIOSDATA_SEL 15 BIOS 32-bit interface (Data) */ 1876{ .ssd_base = 0, 1877 .ssd_limit = 0xfffff, 1878 .ssd_type = SDT_MEMRWA, 1879 .ssd_dpl = 0, 1880 .ssd_p = 1, 1881 .ssd_xx = 0, .ssd_xx1 = 0, 1882 .ssd_def32 = 1, 1883 .ssd_gran = 1 }, 1884/* GBIOSUTIL_SEL 16 BIOS 16-bit interface (Utility) */ 1885{ .ssd_base = 0, 1886 .ssd_limit = 0xfffff, 1887 .ssd_type = SDT_MEMRWA, 1888 .ssd_dpl = 0, 1889 .ssd_p = 1, 1890 .ssd_xx = 0, .ssd_xx1 = 0, 1891 .ssd_def32 = 0, 1892 .ssd_gran = 1 }, 1893/* GBIOSARGS_SEL 17 BIOS 16-bit interface (Arguments) */ 1894{ .ssd_base = 0, 1895 .ssd_limit = 0xfffff, 1896 .ssd_type = SDT_MEMRWA, 1897 .ssd_dpl = 0, 1898 .ssd_p = 1, 1899 .ssd_xx = 0, .ssd_xx1 = 0, 1900 .ssd_def32 = 0, 1901 .ssd_gran = 1 }, 1902/* GNDIS_SEL 18 NDIS Descriptor */ 1903{ .ssd_base = 0x0, 1904 .ssd_limit = 0x0, 1905 .ssd_type = 0, 1906 .ssd_dpl = 0, 1907 .ssd_p = 0, 1908 .ssd_xx = 0, .ssd_xx1 = 0, 1909 .ssd_def32 = 0, 1910 .ssd_gran = 0 }, 1911#endif /* !XEN */ 1912}; 1913 1914static struct soft_segment_descriptor ldt_segs[] = { 1915 /* Null Descriptor - overwritten by call gate */ 1916{ .ssd_base = 0x0, 1917 .ssd_limit = 0x0, 1918 .ssd_type = 0, 1919 .ssd_dpl = 0, 1920 .ssd_p = 0, 1921 .ssd_xx = 0, .ssd_xx1 = 0, 1922 .ssd_def32 = 0, 1923 .ssd_gran = 0 }, 1924 /* Null Descriptor - overwritten by call gate */ 1925{ .ssd_base = 0x0, 1926 .ssd_limit = 0x0, 1927 .ssd_type = 0, 1928 .ssd_dpl = 0, 1929 .ssd_p = 0, 1930 .ssd_xx = 0, .ssd_xx1 = 0, 1931 .ssd_def32 = 0, 1932 .ssd_gran = 0 }, 1933 /* Null Descriptor - overwritten by call gate */ 1934{ .ssd_base = 0x0, 1935 .ssd_limit = 0x0, 1936 .ssd_type = 0, 1937 .ssd_dpl = 0, 1938 .ssd_p = 0, 1939 .ssd_xx = 0, .ssd_xx1 = 0, 1940 .ssd_def32 = 0, 1941 .ssd_gran = 0 }, 1942 /* Code Descriptor for user */ 1943{ .ssd_base = 0x0, 1944 .ssd_limit = 0xfffff, 1945 .ssd_type = SDT_MEMERA, 1946 .ssd_dpl = SEL_UPL, 1947 .ssd_p = 1, 1948 .ssd_xx = 0, .ssd_xx1 = 0, 1949 .ssd_def32 = 1, 1950 .ssd_gran = 1 }, 1951 /* Null Descriptor - overwritten by call gate */ 1952{ .ssd_base = 0x0, 1953 .ssd_limit = 0x0, 1954 .ssd_type = 0, 1955 .ssd_dpl = 0, 1956 .ssd_p = 0, 1957 .ssd_xx = 0, .ssd_xx1 = 0, 1958 .ssd_def32 = 0, 1959 .ssd_gran = 0 }, 1960 /* Data Descriptor for user */ 1961{ .ssd_base = 0x0, 1962 .ssd_limit = 0xfffff, 1963 .ssd_type = SDT_MEMRWA, 1964 .ssd_dpl = SEL_UPL, 1965 .ssd_p = 1, 1966 .ssd_xx = 0, .ssd_xx1 = 0, 1967 .ssd_def32 = 1, 1968 .ssd_gran = 1 }, 1969}; 1970 1971void 1972setidt(idx, func, typ, dpl, selec) 1973 int idx; 1974 inthand_t *func; 1975 int typ; 1976 int dpl; 1977 int selec; 1978{ 1979 struct gate_descriptor *ip; 1980 1981 ip = idt + idx; 1982 ip->gd_looffset = (int)func; 1983 ip->gd_selector = selec; 1984 ip->gd_stkcpy = 0; 1985 ip->gd_xx = 0; 1986 ip->gd_type = typ; 1987 ip->gd_dpl = dpl; 1988 ip->gd_p = 1; 1989 ip->gd_hioffset = ((int)func)>>16 ; 1990} 1991 1992extern inthand_t 1993 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1994 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1995 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1996 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1997 IDTVEC(xmm), 1998#ifdef KDTRACE_HOOKS 1999 IDTVEC(dtrace_ret), 2000#endif 2001#ifdef XENHVM 2002 IDTVEC(xen_intr_upcall), 2003#endif 2004 IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall); 2005 2006#ifdef DDB 2007/* 2008 * Display the index and function name of any IDT entries that don't use 2009 * the default 'rsvd' entry point. 2010 */ 2011DB_SHOW_COMMAND(idt, db_show_idt) 2012{ 2013 struct gate_descriptor *ip; 2014 int idx; 2015 uintptr_t func; 2016 2017 ip = idt; 2018 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) { 2019 func = (ip->gd_hioffset << 16 | ip->gd_looffset); 2020 if (func != (uintptr_t)&IDTVEC(rsvd)) { 2021 db_printf("%3d\t", idx); 2022 db_printsym(func, DB_STGY_PROC); 2023 db_printf("\n"); 2024 } 2025 ip++; 2026 } 2027} 2028 2029/* Show privileged registers. */ 2030DB_SHOW_COMMAND(sysregs, db_show_sysregs) 2031{ 2032 uint64_t idtr, gdtr; 2033 2034 idtr = ridt(); 2035 db_printf("idtr\t0x%08x/%04x\n", 2036 (u_int)(idtr >> 16), (u_int)idtr & 0xffff); 2037 gdtr = rgdt(); 2038 db_printf("gdtr\t0x%08x/%04x\n", 2039 (u_int)(gdtr >> 16), (u_int)gdtr & 0xffff); 2040 db_printf("ldtr\t0x%04x\n", rldt()); 2041 db_printf("tr\t0x%04x\n", rtr()); 2042 db_printf("cr0\t0x%08x\n", rcr0()); 2043 db_printf("cr2\t0x%08x\n", rcr2()); 2044 db_printf("cr3\t0x%08x\n", rcr3()); 2045 db_printf("cr4\t0x%08x\n", rcr4()); 2046} 2047#endif 2048 2049void 2050sdtossd(sd, ssd) 2051 struct segment_descriptor *sd; 2052 struct soft_segment_descriptor *ssd; 2053{ 2054 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 2055 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 2056 ssd->ssd_type = sd->sd_type; 2057 ssd->ssd_dpl = sd->sd_dpl; 2058 ssd->ssd_p = sd->sd_p; 2059 ssd->ssd_def32 = sd->sd_def32; 2060 ssd->ssd_gran = sd->sd_gran; 2061} 2062 2063#if !defined(PC98) && !defined(XEN) 2064static int 2065add_smap_entry(struct bios_smap *smap, vm_paddr_t *physmap, int *physmap_idxp) 2066{ 2067 int i, insert_idx, physmap_idx; 2068 2069 physmap_idx = *physmap_idxp; 2070 2071 if (boothowto & RB_VERBOSE) 2072 printf("SMAP type=%02x base=%016llx len=%016llx\n", 2073 smap->type, smap->base, smap->length); 2074 2075 if (smap->type != SMAP_TYPE_MEMORY) 2076 return (1); 2077 2078 if (smap->length == 0) 2079 return (1); 2080 2081#ifndef PAE 2082 if (smap->base > 0xffffffff) { 2083 printf("%uK of memory above 4GB ignored\n", 2084 (u_int)(smap->length / 1024)); 2085 return (1); 2086 } 2087#endif 2088 2089 /* 2090 * Find insertion point while checking for overlap. Start off by 2091 * assuming the new entry will be added to the end. 2092 */ 2093 insert_idx = physmap_idx + 2; 2094 for (i = 0; i <= physmap_idx; i += 2) { 2095 if (smap->base < physmap[i + 1]) { 2096 if (smap->base + smap->length <= physmap[i]) { 2097 insert_idx = i; 2098 break; 2099 } 2100 if (boothowto & RB_VERBOSE) 2101 printf( 2102 "Overlapping memory regions, ignoring second region\n"); 2103 return (1); 2104 } 2105 } 2106 2107 /* See if we can prepend to the next entry. */ 2108 if (insert_idx <= physmap_idx && 2109 smap->base + smap->length == physmap[insert_idx]) { 2110 physmap[insert_idx] = smap->base; 2111 return (1); 2112 } 2113 2114 /* See if we can append to the previous entry. */ 2115 if (insert_idx > 0 && smap->base == physmap[insert_idx - 1]) { 2116 physmap[insert_idx - 1] += smap->length; 2117 return (1); 2118 } 2119 2120 physmap_idx += 2; 2121 *physmap_idxp = physmap_idx; 2122 if (physmap_idx == PHYSMAP_SIZE) { 2123 printf( 2124 "Too many segments in the physical address map, giving up\n"); 2125 return (0); 2126 } 2127 2128 /* 2129 * Move the last 'N' entries down to make room for the new 2130 * entry if needed. 2131 */ 2132 for (i = physmap_idx; i > insert_idx; i -= 2) { 2133 physmap[i] = physmap[i - 2]; 2134 physmap[i + 1] = physmap[i - 1]; 2135 } 2136 2137 /* Insert the new entry. */ 2138 physmap[insert_idx] = smap->base; 2139 physmap[insert_idx + 1] = smap->base + smap->length; 2140 return (1); 2141} 2142#endif /* !PC98 && !XEN */ 2143 2144#ifndef XEN 2145static void 2146basemem_setup(void) 2147{ 2148 vm_paddr_t pa; 2149 pt_entry_t *pte; 2150 int i; 2151 2152 if (basemem > 640) { 2153 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 2154 basemem); 2155 basemem = 640; 2156 } 2157 2158 /* 2159 * XXX if biosbasemem is now < 640, there is a `hole' 2160 * between the end of base memory and the start of 2161 * ISA memory. The hole may be empty or it may 2162 * contain BIOS code or data. Map it read/write so 2163 * that the BIOS can write to it. (Memory from 0 to 2164 * the physical end of the kernel is mapped read-only 2165 * to begin with and then parts of it are remapped. 2166 * The parts that aren't remapped form holes that 2167 * remain read-only and are unused by the kernel. 2168 * The base memory area is below the physical end of 2169 * the kernel and right now forms a read-only hole. 2170 * The part of it from PAGE_SIZE to 2171 * (trunc_page(biosbasemem * 1024) - 1) will be 2172 * remapped and used by the kernel later.) 2173 * 2174 * This code is similar to the code used in 2175 * pmap_mapdev, but since no memory needs to be 2176 * allocated we simply change the mapping. 2177 */ 2178 for (pa = trunc_page(basemem * 1024); 2179 pa < ISA_HOLE_START; pa += PAGE_SIZE) 2180 pmap_kenter(KERNBASE + pa, pa); 2181 2182 /* 2183 * Map pages between basemem and ISA_HOLE_START, if any, r/w into 2184 * the vm86 page table so that vm86 can scribble on them using 2185 * the vm86 map too. XXX: why 2 ways for this and only 1 way for 2186 * page 0, at least as initialized here? 2187 */ 2188 pte = (pt_entry_t *)vm86paddr; 2189 for (i = basemem / 4; i < 160; i++) 2190 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 2191} 2192#endif /* !XEN */ 2193 2194/* 2195 * Populate the (physmap) array with base/bound pairs describing the 2196 * available physical memory in the system, then test this memory and 2197 * build the phys_avail array describing the actually-available memory. 2198 * 2199 * If we cannot accurately determine the physical memory map, then use 2200 * value from the 0xE801 call, and failing that, the RTC. 2201 * 2202 * Total memory size may be set by the kernel environment variable 2203 * hw.physmem or the compile-time define MAXMEM. 2204 * 2205 * XXX first should be vm_paddr_t. 2206 */ 2207#ifdef PC98 2208static void 2209getmemsize(int first) 2210{ 2211 int off, physmap_idx, pa_indx, da_indx; 2212 u_long physmem_tunable, memtest; 2213 vm_paddr_t physmap[PHYSMAP_SIZE]; 2214 pt_entry_t *pte; 2215 quad_t dcons_addr, dcons_size; 2216 int i; 2217 int pg_n; 2218 u_int extmem; 2219 u_int under16; 2220 vm_paddr_t pa; 2221 2222 bzero(physmap, sizeof(physmap)); 2223 2224 /* XXX - some of EPSON machines can't use PG_N */ 2225 pg_n = PG_N; 2226 if (pc98_machine_type & M_EPSON_PC98) { 2227 switch (epson_machine_id) { 2228#ifdef WB_CACHE 2229 default: 2230#endif 2231 case EPSON_PC486_HX: 2232 case EPSON_PC486_HG: 2233 case EPSON_PC486_HA: 2234 pg_n = 0; 2235 break; 2236 } 2237 } 2238 2239 under16 = pc98_getmemsize(&basemem, &extmem); 2240 basemem_setup(); 2241 2242 physmap[0] = 0; 2243 physmap[1] = basemem * 1024; 2244 physmap_idx = 2; 2245 physmap[physmap_idx] = 0x100000; 2246 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 2247 2248 /* 2249 * Now, physmap contains a map of physical memory. 2250 */ 2251 2252#ifdef SMP 2253 /* make hole for AP bootstrap code */ 2254 physmap[1] = mp_bootaddress(physmap[1]); 2255#endif 2256 2257 /* 2258 * Maxmem isn't the "maximum memory", it's one larger than the 2259 * highest page of the physical address space. It should be 2260 * called something like "Maxphyspage". We may adjust this 2261 * based on ``hw.physmem'' and the results of the memory test. 2262 */ 2263 Maxmem = atop(physmap[physmap_idx + 1]); 2264 2265#ifdef MAXMEM 2266 Maxmem = MAXMEM / 4; 2267#endif 2268 2269 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable)) 2270 Maxmem = atop(physmem_tunable); 2271 2272 /* 2273 * By default keep the memtest enabled. Use a general name so that 2274 * one could eventually do more with the code than just disable it. 2275 */ 2276 memtest = 1; 2277 TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest); 2278 2279 if (atop(physmap[physmap_idx + 1]) != Maxmem && 2280 (boothowto & RB_VERBOSE)) 2281 printf("Physical memory use set to %ldK\n", Maxmem * 4); 2282 2283 /* 2284 * If Maxmem has been increased beyond what the system has detected, 2285 * extend the last memory segment to the new limit. 2286 */ 2287 if (atop(physmap[physmap_idx + 1]) < Maxmem) 2288 physmap[physmap_idx + 1] = ptoa((vm_paddr_t)Maxmem); 2289 2290 /* 2291 * We need to divide chunk if Maxmem is larger than 16MB and 2292 * under 16MB area is not full of memory. 2293 * (1) system area (15-16MB region) is cut off 2294 * (2) extended memory is only over 16MB area (ex. Melco "HYPERMEMORY") 2295 */ 2296 if ((under16 != 16 * 1024) && (extmem > 15 * 1024)) { 2297 /* 15M - 16M region is cut off, so need to divide chunk */ 2298 physmap[physmap_idx + 1] = under16 * 1024; 2299 physmap_idx += 2; 2300 physmap[physmap_idx] = 0x1000000; 2301 physmap[physmap_idx + 1] = physmap[2] + extmem * 1024; 2302 } 2303 2304 /* call pmap initialization to make new kernel address space */ 2305 pmap_bootstrap(first); 2306 2307 /* 2308 * Size up each available chunk of physical memory. 2309 */ 2310 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 2311 pa_indx = 0; 2312 da_indx = 1; 2313 phys_avail[pa_indx++] = physmap[0]; 2314 phys_avail[pa_indx] = physmap[0]; 2315 dump_avail[da_indx] = physmap[0]; 2316 pte = CMAP3; 2317 2318 /* 2319 * Get dcons buffer address 2320 */ 2321 if (getenv_quad("dcons.addr", &dcons_addr) == 0 || 2322 getenv_quad("dcons.size", &dcons_size) == 0) 2323 dcons_addr = 0; 2324 2325 /* 2326 * physmap is in bytes, so when converting to page boundaries, 2327 * round up the start address and round down the end address. 2328 */ 2329 for (i = 0; i <= physmap_idx; i += 2) { 2330 vm_paddr_t end; 2331 2332 end = ptoa((vm_paddr_t)Maxmem); 2333 if (physmap[i + 1] < end) 2334 end = trunc_page(physmap[i + 1]); 2335 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 2336 int tmp, page_bad, full; 2337 int *ptr = (int *)CADDR3; 2338 2339 full = FALSE; 2340 /* 2341 * block out kernel memory as not available. 2342 */ 2343 if (pa >= KERNLOAD && pa < first) 2344 goto do_dump_avail; 2345 2346 /* 2347 * block out dcons buffer 2348 */ 2349 if (dcons_addr > 0 2350 && pa >= trunc_page(dcons_addr) 2351 && pa < dcons_addr + dcons_size) 2352 goto do_dump_avail; 2353 2354 page_bad = FALSE; 2355 if (memtest == 0) 2356 goto skip_memtest; 2357 2358 /* 2359 * map page into kernel: valid, read/write,non-cacheable 2360 */ 2361 *pte = pa | PG_V | PG_RW | pg_n; 2362 invltlb(); 2363 2364 tmp = *(int *)ptr; 2365 /* 2366 * Test for alternating 1's and 0's 2367 */ 2368 *(volatile int *)ptr = 0xaaaaaaaa; 2369 if (*(volatile int *)ptr != 0xaaaaaaaa) 2370 page_bad = TRUE; 2371 /* 2372 * Test for alternating 0's and 1's 2373 */ 2374 *(volatile int *)ptr = 0x55555555; 2375 if (*(volatile int *)ptr != 0x55555555) 2376 page_bad = TRUE; 2377 /* 2378 * Test for all 1's 2379 */ 2380 *(volatile int *)ptr = 0xffffffff; 2381 if (*(volatile int *)ptr != 0xffffffff) 2382 page_bad = TRUE; 2383 /* 2384 * Test for all 0's 2385 */ 2386 *(volatile int *)ptr = 0x0; 2387 if (*(volatile int *)ptr != 0x0) 2388 page_bad = TRUE; 2389 /* 2390 * Restore original value. 2391 */ 2392 *(int *)ptr = tmp; 2393 2394skip_memtest: 2395 /* 2396 * Adjust array of valid/good pages. 2397 */ 2398 if (page_bad == TRUE) 2399 continue; 2400 /* 2401 * If this good page is a continuation of the 2402 * previous set of good pages, then just increase 2403 * the end pointer. Otherwise start a new chunk. 2404 * Note that "end" points one higher than end, 2405 * making the range >= start and < end. 2406 * If we're also doing a speculative memory 2407 * test and we at or past the end, bump up Maxmem 2408 * so that we keep going. The first bad page 2409 * will terminate the loop. 2410 */ 2411 if (phys_avail[pa_indx] == pa) { 2412 phys_avail[pa_indx] += PAGE_SIZE; 2413 } else { 2414 pa_indx++; 2415 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 2416 printf( 2417 "Too many holes in the physical address space, giving up\n"); 2418 pa_indx--; 2419 full = TRUE; 2420 goto do_dump_avail; 2421 } 2422 phys_avail[pa_indx++] = pa; /* start */ 2423 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 2424 } 2425 physmem++; 2426do_dump_avail: 2427 if (dump_avail[da_indx] == pa) { 2428 dump_avail[da_indx] += PAGE_SIZE; 2429 } else { 2430 da_indx++; 2431 if (da_indx == DUMP_AVAIL_ARRAY_END) { 2432 da_indx--; 2433 goto do_next; 2434 } 2435 dump_avail[da_indx++] = pa; /* start */ 2436 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */ 2437 } 2438do_next: 2439 if (full) 2440 break; 2441 } 2442 } 2443 *pte = 0; 2444 invltlb(); 2445 2446 /* 2447 * XXX 2448 * The last chunk must contain at least one page plus the message 2449 * buffer to avoid complicating other code (message buffer address 2450 * calculation, etc.). 2451 */ 2452 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 2453 round_page(msgbufsize) >= phys_avail[pa_indx]) { 2454 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 2455 phys_avail[pa_indx--] = 0; 2456 phys_avail[pa_indx--] = 0; 2457 } 2458 2459 Maxmem = atop(phys_avail[pa_indx]); 2460 2461 /* Trim off space for the message buffer. */ 2462 phys_avail[pa_indx] -= round_page(msgbufsize); 2463 2464 /* Map the message buffer. */ 2465 for (off = 0; off < round_page(msgbufsize); off += PAGE_SIZE) 2466 pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] + 2467 off); 2468 2469 PT_UPDATES_FLUSH(); 2470} 2471#else /* PC98 */ 2472static void 2473getmemsize(int first) 2474{ 2475 int has_smap, off, physmap_idx, pa_indx, da_indx; 2476 u_long physmem_tunable, memtest; 2477 vm_paddr_t physmap[PHYSMAP_SIZE]; 2478 pt_entry_t *pte; 2479 quad_t dcons_addr, dcons_size; 2480#ifndef XEN 2481 int hasbrokenint12, i, res; 2482 u_int extmem; 2483 struct vm86frame vmf; 2484 struct vm86context vmc; 2485 vm_paddr_t pa; 2486 struct bios_smap *smap, *smapbase, *smapend; 2487 u_int32_t smapsize; 2488 caddr_t kmdp; 2489#endif 2490 2491 has_smap = 0; 2492#if defined(XEN) 2493 Maxmem = xen_start_info->nr_pages - init_first; 2494 physmem = Maxmem; 2495 basemem = 0; 2496 physmap[0] = init_first << PAGE_SHIFT; 2497 physmap[1] = ptoa(Maxmem) - round_page(msgbufsize); 2498 physmap_idx = 0; 2499#else 2500#ifdef XBOX 2501 if (arch_i386_is_xbox) { 2502 /* 2503 * We queried the memory size before, so chop off 4MB for 2504 * the framebuffer and inform the OS of this. 2505 */ 2506 physmap[0] = 0; 2507 physmap[1] = (arch_i386_xbox_memsize * 1024 * 1024) - XBOX_FB_SIZE; 2508 physmap_idx = 0; 2509 goto physmap_done; 2510 } 2511#endif 2512 bzero(&vmf, sizeof(vmf)); 2513 bzero(physmap, sizeof(physmap)); 2514 basemem = 0; 2515 2516 /* 2517 * Check if the loader supplied an SMAP memory map. If so, 2518 * use that and do not make any VM86 calls. 2519 */ 2520 physmap_idx = 0; 2521 smapbase = NULL; 2522 kmdp = preload_search_by_type("elf kernel"); 2523 if (kmdp == NULL) 2524 kmdp = preload_search_by_type("elf32 kernel"); 2525 if (kmdp != NULL) 2526 smapbase = (struct bios_smap *)preload_search_info(kmdp, 2527 MODINFO_METADATA | MODINFOMD_SMAP); 2528 if (smapbase != NULL) { 2529 /* 2530 * subr_module.c says: 2531 * "Consumer may safely assume that size value precedes data." 2532 * ie: an int32_t immediately precedes SMAP. 2533 */ 2534 smapsize = *((u_int32_t *)smapbase - 1); 2535 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize); 2536 has_smap = 1; 2537 2538 for (smap = smapbase; smap < smapend; smap++) 2539 if (!add_smap_entry(smap, physmap, &physmap_idx)) 2540 break; 2541 goto have_smap; 2542 } 2543 2544 /* 2545 * Some newer BIOSes have a broken INT 12H implementation 2546 * which causes a kernel panic immediately. In this case, we 2547 * need use the SMAP to determine the base memory size. 2548 */ 2549 hasbrokenint12 = 0; 2550 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12); 2551 if (hasbrokenint12 == 0) { 2552 /* Use INT12 to determine base memory size. */ 2553 vm86_intcall(0x12, &vmf); 2554 basemem = vmf.vmf_ax; 2555 basemem_setup(); 2556 } 2557 2558 /* 2559 * Fetch the memory map with INT 15:E820. Map page 1 R/W into 2560 * the kernel page table so we can use it as a buffer. The 2561 * kernel will unmap this page later. 2562 */ 2563 pmap_kenter(KERNBASE + (1 << PAGE_SHIFT), 1 << PAGE_SHIFT); 2564 vmc.npages = 0; 2565 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 2566 res = vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 2567 KASSERT(res != 0, ("vm86_getptr() failed: address not found")); 2568 2569 vmf.vmf_ebx = 0; 2570 do { 2571 vmf.vmf_eax = 0xE820; 2572 vmf.vmf_edx = SMAP_SIG; 2573 vmf.vmf_ecx = sizeof(struct bios_smap); 2574 i = vm86_datacall(0x15, &vmf, &vmc); 2575 if (i || vmf.vmf_eax != SMAP_SIG) 2576 break; 2577 has_smap = 1; 2578 if (!add_smap_entry(smap, physmap, &physmap_idx)) 2579 break; 2580 } while (vmf.vmf_ebx != 0); 2581 2582have_smap: 2583 /* 2584 * If we didn't fetch the "base memory" size from INT12, 2585 * figure it out from the SMAP (or just guess). 2586 */ 2587 if (basemem == 0) { 2588 for (i = 0; i <= physmap_idx; i += 2) { 2589 if (physmap[i] == 0x00000000) { 2590 basemem = physmap[i + 1] / 1024; 2591 break; 2592 } 2593 } 2594 2595 /* XXX: If we couldn't find basemem from SMAP, just guess. */ 2596 if (basemem == 0) 2597 basemem = 640; 2598 basemem_setup(); 2599 } 2600 2601 if (physmap[1] != 0) 2602 goto physmap_done; 2603 2604 /* 2605 * If we failed to find an SMAP, figure out the extended 2606 * memory size. We will then build a simple memory map with 2607 * two segments, one for "base memory" and the second for 2608 * "extended memory". Note that "extended memory" starts at a 2609 * physical address of 1MB and that both basemem and extmem 2610 * are in units of 1KB. 2611 * 2612 * First, try to fetch the extended memory size via INT 15:E801. 2613 */ 2614 vmf.vmf_ax = 0xE801; 2615 if (vm86_intcall(0x15, &vmf) == 0) { 2616 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 2617 } else { 2618 /* 2619 * If INT15:E801 fails, this is our last ditch effort 2620 * to determine the extended memory size. Currently 2621 * we prefer the RTC value over INT15:88. 2622 */ 2623#if 0 2624 vmf.vmf_ah = 0x88; 2625 vm86_intcall(0x15, &vmf); 2626 extmem = vmf.vmf_ax; 2627#else 2628 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 2629#endif 2630 } 2631 2632 /* 2633 * Special hack for chipsets that still remap the 384k hole when 2634 * there's 16MB of memory - this really confuses people that 2635 * are trying to use bus mastering ISA controllers with the 2636 * "16MB limit"; they only have 16MB, but the remapping puts 2637 * them beyond the limit. 2638 * 2639 * If extended memory is between 15-16MB (16-17MB phys address range), 2640 * chop it to 15MB. 2641 */ 2642 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 2643 extmem = 15 * 1024; 2644 2645 physmap[0] = 0; 2646 physmap[1] = basemem * 1024; 2647 physmap_idx = 2; 2648 physmap[physmap_idx] = 0x100000; 2649 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 2650 2651physmap_done: 2652#endif 2653 /* 2654 * Now, physmap contains a map of physical memory. 2655 */ 2656 2657#ifdef SMP 2658 /* make hole for AP bootstrap code */ 2659 physmap[1] = mp_bootaddress(physmap[1]); 2660#endif 2661 2662 /* 2663 * Maxmem isn't the "maximum memory", it's one larger than the 2664 * highest page of the physical address space. It should be 2665 * called something like "Maxphyspage". We may adjust this 2666 * based on ``hw.physmem'' and the results of the memory test. 2667 */ 2668 Maxmem = atop(physmap[physmap_idx + 1]); 2669 2670#ifdef MAXMEM 2671 Maxmem = MAXMEM / 4; 2672#endif 2673 2674 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable)) 2675 Maxmem = atop(physmem_tunable); 2676 2677 /* 2678 * If we have an SMAP, don't allow MAXMEM or hw.physmem to extend 2679 * the amount of memory in the system. 2680 */ 2681 if (has_smap && Maxmem > atop(physmap[physmap_idx + 1])) 2682 Maxmem = atop(physmap[physmap_idx + 1]); 2683 2684 /* 2685 * By default enable the memory test on real hardware, and disable 2686 * it if we appear to be running in a VM. This avoids touching all 2687 * pages unnecessarily, which doesn't matter on real hardware but is 2688 * bad for shared VM hosts. Use a general name so that 2689 * one could eventually do more with the code than just disable it. 2690 */ 2691 memtest = (vm_guest > VM_GUEST_NO) ? 0 : 1; 2692 TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest); 2693 2694 if (atop(physmap[physmap_idx + 1]) != Maxmem && 2695 (boothowto & RB_VERBOSE)) 2696 printf("Physical memory use set to %ldK\n", Maxmem * 4); 2697 2698 /* 2699 * If Maxmem has been increased beyond what the system has detected, 2700 * extend the last memory segment to the new limit. 2701 */ 2702 if (atop(physmap[physmap_idx + 1]) < Maxmem) 2703 physmap[physmap_idx + 1] = ptoa((vm_paddr_t)Maxmem); 2704 2705 /* call pmap initialization to make new kernel address space */ 2706 pmap_bootstrap(first); 2707 2708 /* 2709 * Size up each available chunk of physical memory. 2710 */ 2711 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 2712 pa_indx = 0; 2713 da_indx = 1; 2714 phys_avail[pa_indx++] = physmap[0]; 2715 phys_avail[pa_indx] = physmap[0]; 2716 dump_avail[da_indx] = physmap[0]; 2717 pte = CMAP3; 2718 2719 /* 2720 * Get dcons buffer address 2721 */ 2722 if (getenv_quad("dcons.addr", &dcons_addr) == 0 || 2723 getenv_quad("dcons.size", &dcons_size) == 0) 2724 dcons_addr = 0; 2725 2726#ifndef XEN 2727 /* 2728 * physmap is in bytes, so when converting to page boundaries, 2729 * round up the start address and round down the end address. 2730 */ 2731 for (i = 0; i <= physmap_idx; i += 2) { 2732 vm_paddr_t end; 2733 2734 end = ptoa((vm_paddr_t)Maxmem); 2735 if (physmap[i + 1] < end) 2736 end = trunc_page(physmap[i + 1]); 2737 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 2738 int tmp, page_bad, full; 2739 int *ptr = (int *)CADDR3; 2740 2741 full = FALSE; 2742 /* 2743 * block out kernel memory as not available. 2744 */ 2745 if (pa >= KERNLOAD && pa < first) 2746 goto do_dump_avail; 2747 2748 /* 2749 * block out dcons buffer 2750 */ 2751 if (dcons_addr > 0 2752 && pa >= trunc_page(dcons_addr) 2753 && pa < dcons_addr + dcons_size) 2754 goto do_dump_avail; 2755 2756 page_bad = FALSE; 2757 if (memtest == 0) 2758 goto skip_memtest; 2759 2760 /* 2761 * map page into kernel: valid, read/write,non-cacheable 2762 */ 2763 *pte = pa | PG_V | PG_RW | PG_N; 2764 invltlb(); 2765 2766 tmp = *(int *)ptr; 2767 /* 2768 * Test for alternating 1's and 0's 2769 */ 2770 *(volatile int *)ptr = 0xaaaaaaaa; 2771 if (*(volatile int *)ptr != 0xaaaaaaaa) 2772 page_bad = TRUE; 2773 /* 2774 * Test for alternating 0's and 1's 2775 */ 2776 *(volatile int *)ptr = 0x55555555; 2777 if (*(volatile int *)ptr != 0x55555555) 2778 page_bad = TRUE; 2779 /* 2780 * Test for all 1's 2781 */ 2782 *(volatile int *)ptr = 0xffffffff; 2783 if (*(volatile int *)ptr != 0xffffffff) 2784 page_bad = TRUE; 2785 /* 2786 * Test for all 0's 2787 */ 2788 *(volatile int *)ptr = 0x0; 2789 if (*(volatile int *)ptr != 0x0) 2790 page_bad = TRUE; 2791 /* 2792 * Restore original value. 2793 */ 2794 *(int *)ptr = tmp; 2795 2796skip_memtest: 2797 /* 2798 * Adjust array of valid/good pages. 2799 */ 2800 if (page_bad == TRUE) 2801 continue; 2802 /* 2803 * If this good page is a continuation of the 2804 * previous set of good pages, then just increase 2805 * the end pointer. Otherwise start a new chunk. 2806 * Note that "end" points one higher than end, 2807 * making the range >= start and < end. 2808 * If we're also doing a speculative memory 2809 * test and we at or past the end, bump up Maxmem 2810 * so that we keep going. The first bad page 2811 * will terminate the loop. 2812 */ 2813 if (phys_avail[pa_indx] == pa) { 2814 phys_avail[pa_indx] += PAGE_SIZE; 2815 } else { 2816 pa_indx++; 2817 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 2818 printf( 2819 "Too many holes in the physical address space, giving up\n"); 2820 pa_indx--; 2821 full = TRUE; 2822 goto do_dump_avail; 2823 } 2824 phys_avail[pa_indx++] = pa; /* start */ 2825 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 2826 } 2827 physmem++; 2828do_dump_avail: 2829 if (dump_avail[da_indx] == pa) { 2830 dump_avail[da_indx] += PAGE_SIZE; 2831 } else { 2832 da_indx++; 2833 if (da_indx == DUMP_AVAIL_ARRAY_END) { 2834 da_indx--; 2835 goto do_next; 2836 } 2837 dump_avail[da_indx++] = pa; /* start */ 2838 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */ 2839 } 2840do_next: 2841 if (full) 2842 break; 2843 } 2844 } 2845 *pte = 0; 2846 invltlb(); 2847#else 2848 phys_avail[0] = physfree; 2849 phys_avail[1] = xen_start_info->nr_pages*PAGE_SIZE; 2850 dump_avail[0] = 0; 2851 dump_avail[1] = xen_start_info->nr_pages*PAGE_SIZE; 2852 2853#endif 2854 2855 /* 2856 * XXX 2857 * The last chunk must contain at least one page plus the message 2858 * buffer to avoid complicating other code (message buffer address 2859 * calculation, etc.). 2860 */ 2861 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 2862 round_page(msgbufsize) >= phys_avail[pa_indx]) { 2863 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 2864 phys_avail[pa_indx--] = 0; 2865 phys_avail[pa_indx--] = 0; 2866 } 2867 2868 Maxmem = atop(phys_avail[pa_indx]); 2869 2870 /* Trim off space for the message buffer. */ 2871 phys_avail[pa_indx] -= round_page(msgbufsize); 2872 2873 /* Map the message buffer. */ 2874 for (off = 0; off < round_page(msgbufsize); off += PAGE_SIZE) 2875 pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] + 2876 off); 2877 2878 PT_UPDATES_FLUSH(); 2879} 2880#endif /* PC98 */ 2881 2882#ifdef XEN 2883#define MTOPSIZE (1<<(14 + PAGE_SHIFT)) 2884 2885register_t 2886init386(first) 2887 int first; 2888{ 2889 unsigned long gdtmachpfn; 2890 int error, gsel_tss, metadata_missing, x, pa; 2891 struct pcpu *pc; 2892#ifdef CPU_ENABLE_SSE 2893 struct xstate_hdr *xhdr; 2894#endif 2895 struct callback_register event = { 2896 .type = CALLBACKTYPE_event, 2897 .address = {GSEL(GCODE_SEL, SEL_KPL), (unsigned long)Xhypervisor_callback }, 2898 }; 2899 struct callback_register failsafe = { 2900 .type = CALLBACKTYPE_failsafe, 2901 .address = {GSEL(GCODE_SEL, SEL_KPL), (unsigned long)failsafe_callback }, 2902 }; 2903 2904 thread0.td_kstack = proc0kstack; 2905 thread0.td_kstack_pages = KSTACK_PAGES; 2906 2907 /* 2908 * This may be done better later if it gets more high level 2909 * components in it. If so just link td->td_proc here. 2910 */ 2911 proc_linkup0(&proc0, &thread0); 2912 2913 metadata_missing = 0; 2914 if (xen_start_info->mod_start) { 2915 preload_metadata = (caddr_t)xen_start_info->mod_start; 2916 preload_bootstrap_relocate(KERNBASE); 2917 } else { 2918 metadata_missing = 1; 2919 } 2920 if (envmode == 1) 2921 kern_envp = static_env; 2922 else if ((caddr_t)xen_start_info->cmd_line) 2923 kern_envp = xen_setbootenv((caddr_t)xen_start_info->cmd_line); 2924 2925 boothowto |= xen_boothowto(kern_envp); 2926 2927 /* Init basic tunables, hz etc */ 2928 init_param1(); 2929 2930 /* 2931 * XEN occupies a portion of the upper virtual address space 2932 * At its base it manages an array mapping machine page frames 2933 * to physical page frames - hence we need to be able to 2934 * access 4GB - (64MB - 4MB + 64k) 2935 */ 2936 gdt_segs[GPRIV_SEL].ssd_limit = atop(HYPERVISOR_VIRT_START + MTOPSIZE); 2937 gdt_segs[GUFS_SEL].ssd_limit = atop(HYPERVISOR_VIRT_START + MTOPSIZE); 2938 gdt_segs[GUGS_SEL].ssd_limit = atop(HYPERVISOR_VIRT_START + MTOPSIZE); 2939 gdt_segs[GCODE_SEL].ssd_limit = atop(HYPERVISOR_VIRT_START + MTOPSIZE); 2940 gdt_segs[GDATA_SEL].ssd_limit = atop(HYPERVISOR_VIRT_START + MTOPSIZE); 2941 gdt_segs[GUCODE_SEL].ssd_limit = atop(HYPERVISOR_VIRT_START + MTOPSIZE); 2942 gdt_segs[GUDATA_SEL].ssd_limit = atop(HYPERVISOR_VIRT_START + MTOPSIZE); 2943 gdt_segs[GBIOSLOWMEM_SEL].ssd_limit = atop(HYPERVISOR_VIRT_START + MTOPSIZE); 2944 2945 pc = &__pcpu[0]; 2946 gdt_segs[GPRIV_SEL].ssd_base = (int) pc; 2947 gdt_segs[GPROC0_SEL].ssd_base = (int) &pc->pc_common_tss; 2948 2949 PT_SET_MA(gdt, xpmap_ptom(VTOP(gdt)) | PG_V | PG_RW); 2950 bzero(gdt, PAGE_SIZE); 2951 for (x = 0; x < NGDT; x++) 2952 ssdtosd(&gdt_segs[x], &gdt[x].sd); 2953 2954 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_SPIN); 2955 2956 gdtmachpfn = vtomach(gdt) >> PAGE_SHIFT; 2957 PT_SET_MA(gdt, xpmap_ptom(VTOP(gdt)) | PG_V); 2958 PANIC_IF(HYPERVISOR_set_gdt(&gdtmachpfn, 512) != 0); 2959 lgdt(&r_gdt); 2960 gdtset = 1; 2961 2962 if ((error = HYPERVISOR_set_trap_table(trap_table)) != 0) { 2963 panic("set_trap_table failed - error %d\n", error); 2964 } 2965 2966 error = HYPERVISOR_callback_op(CALLBACKOP_register, &event); 2967 if (error == 0) 2968 error = HYPERVISOR_callback_op(CALLBACKOP_register, &failsafe); 2969#if CONFIG_XEN_COMPAT <= 0x030002 2970 if (error == -ENOXENSYS) 2971 HYPERVISOR_set_callbacks(GSEL(GCODE_SEL, SEL_KPL), 2972 (unsigned long)Xhypervisor_callback, 2973 GSEL(GCODE_SEL, SEL_KPL), (unsigned long)failsafe_callback); 2974#endif 2975 pcpu_init(pc, 0, sizeof(struct pcpu)); 2976 for (pa = first; pa < first + DPCPU_SIZE; pa += PAGE_SIZE) 2977 pmap_kenter(pa + KERNBASE, pa); 2978 dpcpu_init((void *)(first + KERNBASE), 0); 2979 first += DPCPU_SIZE; 2980 physfree += DPCPU_SIZE; 2981 init_first += DPCPU_SIZE / PAGE_SIZE; 2982 2983 PCPU_SET(prvspace, pc); 2984 PCPU_SET(curthread, &thread0); 2985 2986 /* 2987 * Initialize mutexes. 2988 * 2989 * icu_lock: in order to allow an interrupt to occur in a critical 2990 * section, to set pcpu->ipending (etc...) properly, we 2991 * must be able to get the icu lock, so it can't be 2992 * under witness. 2993 */ 2994 mutex_init(); 2995 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS | MTX_NOPROFILE); 2996 2997 /* make ldt memory segments */ 2998 PT_SET_MA(ldt, xpmap_ptom(VTOP(ldt)) | PG_V | PG_RW); 2999 bzero(ldt, PAGE_SIZE); 3000 ldt_segs[LUCODE_SEL].ssd_limit = atop(0 - 1); 3001 ldt_segs[LUDATA_SEL].ssd_limit = atop(0 - 1); 3002 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 3003 ssdtosd(&ldt_segs[x], &ldt[x].sd); 3004 3005 default_proc_ldt.ldt_base = (caddr_t)ldt; 3006 default_proc_ldt.ldt_len = 6; 3007 _default_ldt = (int)&default_proc_ldt; 3008 PCPU_SET(currentldt, _default_ldt); 3009 PT_SET_MA(ldt, *vtopte((unsigned long)ldt) & ~PG_RW); 3010 xen_set_ldt((unsigned long) ldt, (sizeof ldt_segs / sizeof ldt_segs[0])); 3011 3012#if defined(XEN_PRIVILEGED) 3013 /* 3014 * Initialize the i8254 before the console so that console 3015 * initialization can use DELAY(). 3016 */ 3017 i8254_init(); 3018#endif 3019 3020 /* 3021 * Initialize the console before we print anything out. 3022 */ 3023 cninit(); 3024 3025 if (metadata_missing) 3026 printf("WARNING: loader(8) metadata is missing!\n"); 3027 3028#ifdef DEV_ISA 3029#ifdef DEV_ATPIC 3030 elcr_probe(); 3031 atpic_startup(); 3032#else 3033 /* Reset and mask the atpics and leave them shut down. */ 3034 atpic_reset(); 3035 3036 /* 3037 * Point the ICU spurious interrupt vectors at the APIC spurious 3038 * interrupt handler. 3039 */ 3040 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYS386IGT, SEL_KPL, 3041 GSEL(GCODE_SEL, SEL_KPL)); 3042 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYS386IGT, SEL_KPL, 3043 GSEL(GCODE_SEL, SEL_KPL)); 3044#endif 3045#endif 3046 3047#ifdef DDB 3048 ksym_start = bootinfo.bi_symtab; 3049 ksym_end = bootinfo.bi_esymtab; 3050#endif 3051 3052 kdb_init(); 3053 3054#ifdef KDB 3055 if (boothowto & RB_KDB) 3056 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger"); 3057#endif 3058 3059 finishidentcpu(); /* Final stage of CPU initialization */ 3060 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 3061 GSEL(GCODE_SEL, SEL_KPL)); 3062 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 3063 GSEL(GCODE_SEL, SEL_KPL)); 3064 initializecpu(); /* Initialize CPU registers */ 3065 initializecpucache(); 3066 3067 /* pointer to selector slot for %fs/%gs */ 3068 PCPU_SET(fsgs_gdt, &gdt[GUFS_SEL].sd); 3069 3070 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 3071 dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)]; 3072 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 3073 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 3074#if defined(PAE) || defined(PAE_TABLES) 3075 dblfault_tss.tss_cr3 = (int)IdlePDPT; 3076#else 3077 dblfault_tss.tss_cr3 = (int)IdlePTD; 3078#endif 3079 dblfault_tss.tss_eip = (int)dblfault_handler; 3080 dblfault_tss.tss_eflags = PSL_KERNEL; 3081 dblfault_tss.tss_ds = dblfault_tss.tss_es = 3082 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 3083 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 3084 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 3085 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 3086 3087 vm86_initialize(); 3088 getmemsize(first); 3089 init_param2(physmem); 3090 3091 /* now running on new page tables, configured,and u/iom is accessible */ 3092 3093 msgbufinit(msgbufp, msgbufsize); 3094#ifdef DEV_NPX 3095 npxinit(true); 3096#endif 3097 /* 3098 * Set up thread0 pcb after npxinit calculated pcb + fpu save 3099 * area size. Zero out the extended state header in fpu save 3100 * area. 3101 */ 3102 thread0.td_pcb = get_pcb_td(&thread0); 3103 bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size); 3104#ifdef CPU_ENABLE_SSE 3105 if (use_xsave) { 3106 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) + 3107 1); 3108 xhdr->xstate_bv = xsave_mask; 3109 } 3110#endif 3111 PCPU_SET(curpcb, thread0.td_pcb); 3112 /* make an initial tss so cpu can get interrupt stack on syscall! */ 3113 /* Note: -16 is so we can grow the trapframe if we came from vm86 */ 3114 PCPU_SET(common_tss.tss_esp0, (vm_offset_t)thread0.td_pcb - 16); 3115 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 3116 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 3117 HYPERVISOR_stack_switch(GSEL(GDATA_SEL, SEL_KPL), 3118 PCPU_GET(common_tss.tss_esp0)); 3119 3120 /* transfer to user mode */ 3121 3122 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL); 3123 _udatasel = GSEL(GUDATA_SEL, SEL_UPL); 3124 3125 /* setup proc 0's pcb */ 3126 thread0.td_pcb->pcb_flags = 0; 3127#if defined(PAE) || defined(PAE_TABLES) 3128 thread0.td_pcb->pcb_cr3 = (int)IdlePDPT; 3129#else 3130 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; 3131#endif 3132 thread0.td_pcb->pcb_ext = 0; 3133 thread0.td_frame = &proc0_tf; 3134 thread0.td_pcb->pcb_fsd = PCPU_GET(fsgs_gdt)[0]; 3135 thread0.td_pcb->pcb_gsd = PCPU_GET(fsgs_gdt)[1]; 3136 3137 cpu_probe_amdc1e(); 3138 3139 /* Location of kernel stack for locore */ 3140 return ((register_t)thread0.td_pcb); 3141} 3142 3143#else 3144register_t 3145init386(first) 3146 int first; 3147{ 3148 struct gate_descriptor *gdp; 3149 int gsel_tss, metadata_missing, x, pa; 3150 struct pcpu *pc; 3151#ifdef CPU_ENABLE_SSE 3152 struct xstate_hdr *xhdr; 3153#endif 3154 3155 thread0.td_kstack = proc0kstack; 3156 thread0.td_kstack_pages = TD0_KSTACK_PAGES; 3157 3158 /* 3159 * This may be done better later if it gets more high level 3160 * components in it. If so just link td->td_proc here. 3161 */ 3162 proc_linkup0(&proc0, &thread0); 3163 3164#ifdef PC98 3165 /* 3166 * Initialize DMAC 3167 */ 3168 pc98_init_dmac(); 3169#endif 3170 3171 metadata_missing = 0; 3172 if (bootinfo.bi_modulep) { 3173 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 3174 preload_bootstrap_relocate(KERNBASE); 3175 } else { 3176 metadata_missing = 1; 3177 } 3178 if (envmode == 1) 3179 kern_envp = static_env; 3180 else if (bootinfo.bi_envp) 3181 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 3182 3183 /* Init basic tunables, hz etc */ 3184 init_param1(); 3185 3186 /* 3187 * Make gdt memory segments. All segments cover the full 4GB 3188 * of address space and permissions are enforced at page level. 3189 */ 3190 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1); 3191 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1); 3192 gdt_segs[GUCODE_SEL].ssd_limit = atop(0 - 1); 3193 gdt_segs[GUDATA_SEL].ssd_limit = atop(0 - 1); 3194 gdt_segs[GUFS_SEL].ssd_limit = atop(0 - 1); 3195 gdt_segs[GUGS_SEL].ssd_limit = atop(0 - 1); 3196 3197 pc = &__pcpu[0]; 3198 gdt_segs[GPRIV_SEL].ssd_limit = atop(0 - 1); 3199 gdt_segs[GPRIV_SEL].ssd_base = (int) pc; 3200 gdt_segs[GPROC0_SEL].ssd_base = (int) &pc->pc_common_tss; 3201 3202 for (x = 0; x < NGDT; x++) 3203 ssdtosd(&gdt_segs[x], &gdt[x].sd); 3204 3205 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 3206 r_gdt.rd_base = (int) gdt; 3207 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_SPIN); 3208 lgdt(&r_gdt); 3209 3210 pcpu_init(pc, 0, sizeof(struct pcpu)); 3211 for (pa = first; pa < first + DPCPU_SIZE; pa += PAGE_SIZE) 3212 pmap_kenter(pa + KERNBASE, pa); 3213 dpcpu_init((void *)(first + KERNBASE), 0); 3214 first += DPCPU_SIZE; 3215 PCPU_SET(prvspace, pc); 3216 PCPU_SET(curthread, &thread0); 3217 3218 /* 3219 * Initialize mutexes. 3220 * 3221 * icu_lock: in order to allow an interrupt to occur in a critical 3222 * section, to set pcpu->ipending (etc...) properly, we 3223 * must be able to get the icu lock, so it can't be 3224 * under witness. 3225 */ 3226 mutex_init(); 3227 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS | MTX_NOPROFILE); 3228 3229 /* make ldt memory segments */ 3230 ldt_segs[LUCODE_SEL].ssd_limit = atop(0 - 1); 3231 ldt_segs[LUDATA_SEL].ssd_limit = atop(0 - 1); 3232 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 3233 ssdtosd(&ldt_segs[x], &ldt[x].sd); 3234 3235 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 3236 lldt(_default_ldt); 3237 PCPU_SET(currentldt, _default_ldt); 3238 3239 /* exceptions */ 3240 for (x = 0; x < NIDT; x++) 3241 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 3242 GSEL(GCODE_SEL, SEL_KPL)); 3243 setidt(IDT_DE, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, 3244 GSEL(GCODE_SEL, SEL_KPL)); 3245 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYS386IGT, SEL_KPL, 3246 GSEL(GCODE_SEL, SEL_KPL)); 3247 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYS386IGT, SEL_KPL, 3248 GSEL(GCODE_SEL, SEL_KPL)); 3249 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYS386IGT, SEL_UPL, 3250 GSEL(GCODE_SEL, SEL_KPL)); 3251 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, 3252 GSEL(GCODE_SEL, SEL_KPL)); 3253 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, 3254 GSEL(GCODE_SEL, SEL_KPL)); 3255 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 3256 GSEL(GCODE_SEL, SEL_KPL)); 3257 setidt(IDT_NM, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL 3258 , GSEL(GCODE_SEL, SEL_KPL)); 3259 setidt(IDT_DF, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 3260 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, 3261 GSEL(GCODE_SEL, SEL_KPL)); 3262 setidt(IDT_TS, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, 3263 GSEL(GCODE_SEL, SEL_KPL)); 3264 setidt(IDT_NP, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, 3265 GSEL(GCODE_SEL, SEL_KPL)); 3266 setidt(IDT_SS, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, 3267 GSEL(GCODE_SEL, SEL_KPL)); 3268 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 3269 GSEL(GCODE_SEL, SEL_KPL)); 3270 setidt(IDT_PF, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, 3271 GSEL(GCODE_SEL, SEL_KPL)); 3272 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, 3273 GSEL(GCODE_SEL, SEL_KPL)); 3274 setidt(IDT_AC, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, 3275 GSEL(GCODE_SEL, SEL_KPL)); 3276 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, 3277 GSEL(GCODE_SEL, SEL_KPL)); 3278 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, 3279 GSEL(GCODE_SEL, SEL_KPL)); 3280 setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL, 3281 GSEL(GCODE_SEL, SEL_KPL)); 3282#ifdef KDTRACE_HOOKS 3283 setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret), SDT_SYS386TGT, SEL_UPL, 3284 GSEL(GCODE_SEL, SEL_KPL)); 3285#endif 3286#ifdef XENHVM 3287 setidt(IDT_EVTCHN, &IDTVEC(xen_intr_upcall), SDT_SYS386IGT, SEL_UPL, 3288 GSEL(GCODE_SEL, SEL_KPL)); 3289#endif 3290 3291 r_idt.rd_limit = sizeof(idt0) - 1; 3292 r_idt.rd_base = (int) idt; 3293 lidt(&r_idt); 3294 3295#ifdef XBOX 3296 /* 3297 * The following code queries the PCI ID of 0:0:0. For the XBOX, 3298 * This should be 0x10de / 0x02a5. 3299 * 3300 * This is exactly what Linux does. 3301 */ 3302 outl(0xcf8, 0x80000000); 3303 if (inl(0xcfc) == 0x02a510de) { 3304 arch_i386_is_xbox = 1; 3305 pic16l_setled(XBOX_LED_GREEN); 3306 3307 /* 3308 * We are an XBOX, but we may have either 64MB or 128MB of 3309 * memory. The PCI host bridge should be programmed for this, 3310 * so we just query it. 3311 */ 3312 outl(0xcf8, 0x80000084); 3313 arch_i386_xbox_memsize = (inl(0xcfc) == 0x7FFFFFF) ? 128 : 64; 3314 } 3315#endif /* XBOX */ 3316 3317 /* 3318 * Initialize the i8254 before the console so that console 3319 * initialization can use DELAY(). 3320 */ 3321 i8254_init(); 3322 3323 finishidentcpu(); /* Final stage of CPU initialization */ 3324 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 3325 GSEL(GCODE_SEL, SEL_KPL)); 3326 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 3327 GSEL(GCODE_SEL, SEL_KPL)); 3328 initializecpu(); /* Initialize CPU registers */ 3329 initializecpucache(); 3330 3331 /* pointer to selector slot for %fs/%gs */ 3332 PCPU_SET(fsgs_gdt, &gdt[GUFS_SEL].sd); 3333 3334 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 3335 dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)]; 3336 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 3337 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 3338#if defined(PAE) || defined(PAE_TABLES) 3339 dblfault_tss.tss_cr3 = (int)IdlePDPT; 3340#else 3341 dblfault_tss.tss_cr3 = (int)IdlePTD; 3342#endif 3343 dblfault_tss.tss_eip = (int)dblfault_handler; 3344 dblfault_tss.tss_eflags = PSL_KERNEL; 3345 dblfault_tss.tss_ds = dblfault_tss.tss_es = 3346 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 3347 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 3348 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 3349 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 3350 3351 vm86_initialize(); 3352 getmemsize(first); 3353 init_param2(physmem); 3354 3355 /* now running on new page tables, configured,and u/iom is accessible */ 3356 3357 /* 3358 * Initialize the console before we print anything out. 3359 */ 3360 cninit(); 3361 3362 if (metadata_missing) 3363 printf("WARNING: loader(8) metadata is missing!\n"); 3364 3365#ifdef DEV_ISA 3366#ifdef DEV_ATPIC 3367#ifndef PC98 3368 elcr_probe(); 3369#endif 3370 atpic_startup(); 3371#else 3372 /* Reset and mask the atpics and leave them shut down. */ 3373 atpic_reset(); 3374 3375 /* 3376 * Point the ICU spurious interrupt vectors at the APIC spurious 3377 * interrupt handler. 3378 */ 3379 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYS386IGT, SEL_KPL, 3380 GSEL(GCODE_SEL, SEL_KPL)); 3381 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYS386IGT, SEL_KPL, 3382 GSEL(GCODE_SEL, SEL_KPL)); 3383#endif 3384#endif 3385 3386#ifdef DDB 3387 ksym_start = bootinfo.bi_symtab; 3388 ksym_end = bootinfo.bi_esymtab; 3389#endif 3390 3391 kdb_init(); 3392 3393#ifdef KDB 3394 if (boothowto & RB_KDB) 3395 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger"); 3396#endif 3397 3398 msgbufinit(msgbufp, msgbufsize); 3399#ifdef DEV_NPX 3400 npxinit(true); 3401#endif 3402 /* 3403 * Set up thread0 pcb after npxinit calculated pcb + fpu save 3404 * area size. Zero out the extended state header in fpu save 3405 * area. 3406 */ 3407 thread0.td_pcb = get_pcb_td(&thread0); 3408 bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size); 3409#ifdef CPU_ENABLE_SSE 3410 if (use_xsave) { 3411 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) + 3412 1); 3413 xhdr->xstate_bv = xsave_mask; 3414 } 3415#endif 3416 PCPU_SET(curpcb, thread0.td_pcb); 3417 /* make an initial tss so cpu can get interrupt stack on syscall! */ 3418 /* Note: -16 is so we can grow the trapframe if we came from vm86 */ 3419 PCPU_SET(common_tss.tss_esp0, (vm_offset_t)thread0.td_pcb - 16); 3420 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 3421 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 3422 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd); 3423 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt)); 3424 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16); 3425 ltr(gsel_tss); 3426 3427 /* make a call gate to reenter kernel with */ 3428 gdp = &ldt[LSYS5CALLS_SEL].gd; 3429 3430 x = (int) &IDTVEC(lcall_syscall); 3431 gdp->gd_looffset = x; 3432 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 3433 gdp->gd_stkcpy = 1; 3434 gdp->gd_type = SDT_SYS386CGT; 3435 gdp->gd_dpl = SEL_UPL; 3436 gdp->gd_p = 1; 3437 gdp->gd_hioffset = x >> 16; 3438 3439 /* XXX does this work? */ 3440 /* XXX yes! */ 3441 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 3442 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 3443 3444 /* transfer to user mode */ 3445 3446 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL); 3447 _udatasel = GSEL(GUDATA_SEL, SEL_UPL); 3448 3449 /* setup proc 0's pcb */ 3450 thread0.td_pcb->pcb_flags = 0; 3451#if defined(PAE) || defined(PAE_TABLES) 3452 thread0.td_pcb->pcb_cr3 = (int)IdlePDPT; 3453#else 3454 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; 3455#endif 3456 thread0.td_pcb->pcb_ext = 0; 3457 thread0.td_frame = &proc0_tf; 3458 3459 cpu_probe_amdc1e(); 3460 3461#ifdef FDT 3462 x86_init_fdt(); 3463#endif 3464 3465 /* Location of kernel stack for locore */ 3466 return ((register_t)thread0.td_pcb); 3467} 3468#endif 3469 3470void 3471cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 3472{ 3473 3474 pcpu->pc_acpi_id = 0xffffffff; 3475} 3476 3477#ifndef PC98 3478static int 3479smap_sysctl_handler(SYSCTL_HANDLER_ARGS) 3480{ 3481 struct bios_smap *smapbase; 3482 struct bios_smap_xattr smap; 3483 caddr_t kmdp; 3484 uint32_t *smapattr; 3485 int count, error, i; 3486 3487 /* Retrieve the system memory map from the loader. */ 3488 kmdp = preload_search_by_type("elf kernel"); 3489 if (kmdp == NULL) 3490 kmdp = preload_search_by_type("elf32 kernel"); 3491 if (kmdp == NULL) 3492 return (0); 3493 smapbase = (struct bios_smap *)preload_search_info(kmdp, 3494 MODINFO_METADATA | MODINFOMD_SMAP); 3495 if (smapbase == NULL) 3496 return (0); 3497 smapattr = (uint32_t *)preload_search_info(kmdp, 3498 MODINFO_METADATA | MODINFOMD_SMAP_XATTR); 3499 count = *((u_int32_t *)smapbase - 1) / sizeof(*smapbase); 3500 error = 0; 3501 for (i = 0; i < count; i++) { 3502 smap.base = smapbase[i].base; 3503 smap.length = smapbase[i].length; 3504 smap.type = smapbase[i].type; 3505 if (smapattr != NULL) 3506 smap.xattr = smapattr[i]; 3507 else 3508 smap.xattr = 0; 3509 error = SYSCTL_OUT(req, &smap, sizeof(smap)); 3510 } 3511 return (error); 3512} 3513SYSCTL_PROC(_machdep, OID_AUTO, smap, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0, 3514 smap_sysctl_handler, "S,bios_smap_xattr", "Raw BIOS SMAP data"); 3515#endif /* !PC98 */ 3516 3517void 3518spinlock_enter(void) 3519{ 3520 struct thread *td; 3521 register_t flags; 3522 3523 td = curthread; 3524 if (td->td_md.md_spinlock_count == 0) { 3525 flags = intr_disable(); 3526 td->td_md.md_spinlock_count = 1; 3527 td->td_md.md_saved_flags = flags; 3528 } else 3529 td->td_md.md_spinlock_count++; 3530 critical_enter(); 3531} 3532 3533void 3534spinlock_exit(void) 3535{ 3536 struct thread *td; 3537 register_t flags; 3538 3539 td = curthread; 3540 critical_exit(); 3541 flags = td->td_md.md_saved_flags; 3542 td->td_md.md_spinlock_count--; 3543 if (td->td_md.md_spinlock_count == 0) 3544 intr_restore(flags); 3545} 3546 3547#if defined(I586_CPU) && !defined(NO_F00F_HACK) 3548static void f00f_hack(void *unused); 3549SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 3550 3551static void 3552f00f_hack(void *unused) 3553{ 3554 struct gate_descriptor *new_idt; 3555 vm_offset_t tmp; 3556 3557 if (!has_f00f_bug) 3558 return; 3559 3560 GIANT_REQUIRED; 3561 3562 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 3563 3564 tmp = kmem_malloc(kernel_arena, PAGE_SIZE * 2, M_WAITOK | M_ZERO); 3565 if (tmp == 0) 3566 panic("kmem_malloc returned 0"); 3567 3568 /* Put the problematic entry (#6) at the end of the lower page. */ 3569 new_idt = (struct gate_descriptor*) 3570 (tmp + PAGE_SIZE - 7 * sizeof(struct gate_descriptor)); 3571 bcopy(idt, new_idt, sizeof(idt0)); 3572 r_idt.rd_base = (u_int)new_idt; 3573 lidt(&r_idt); 3574 idt = new_idt; 3575 pmap_protect(kernel_pmap, tmp, tmp + PAGE_SIZE, VM_PROT_READ); 3576} 3577#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 3578 3579/* 3580 * Construct a PCB from a trapframe. This is called from kdb_trap() where 3581 * we want to start a backtrace from the function that caused us to enter 3582 * the debugger. We have the context in the trapframe, but base the trace 3583 * on the PCB. The PCB doesn't have to be perfect, as long as it contains 3584 * enough for a backtrace. 3585 */ 3586void 3587makectx(struct trapframe *tf, struct pcb *pcb) 3588{ 3589 3590 pcb->pcb_edi = tf->tf_edi; 3591 pcb->pcb_esi = tf->tf_esi; 3592 pcb->pcb_ebp = tf->tf_ebp; 3593 pcb->pcb_ebx = tf->tf_ebx; 3594 pcb->pcb_eip = tf->tf_eip; 3595 pcb->pcb_esp = (ISPL(tf->tf_cs)) ? tf->tf_esp : (int)(tf + 1) - 8; 3596} 3597 3598int 3599ptrace_set_pc(struct thread *td, u_long addr) 3600{ 3601 3602 td->td_frame->tf_eip = addr; 3603 return (0); 3604} 3605 3606int 3607ptrace_single_step(struct thread *td) 3608{ 3609 td->td_frame->tf_eflags |= PSL_T; 3610 return (0); 3611} 3612 3613int 3614ptrace_clear_single_step(struct thread *td) 3615{ 3616 td->td_frame->tf_eflags &= ~PSL_T; 3617 return (0); 3618} 3619 3620int 3621fill_regs(struct thread *td, struct reg *regs) 3622{ 3623 struct pcb *pcb; 3624 struct trapframe *tp; 3625 3626 tp = td->td_frame; 3627 pcb = td->td_pcb; 3628 regs->r_gs = pcb->pcb_gs; 3629 return (fill_frame_regs(tp, regs)); 3630} 3631 3632int 3633fill_frame_regs(struct trapframe *tp, struct reg *regs) 3634{ 3635 regs->r_fs = tp->tf_fs; 3636 regs->r_es = tp->tf_es; 3637 regs->r_ds = tp->tf_ds; 3638 regs->r_edi = tp->tf_edi; 3639 regs->r_esi = tp->tf_esi; 3640 regs->r_ebp = tp->tf_ebp; 3641 regs->r_ebx = tp->tf_ebx; 3642 regs->r_edx = tp->tf_edx; 3643 regs->r_ecx = tp->tf_ecx; 3644 regs->r_eax = tp->tf_eax; 3645 regs->r_eip = tp->tf_eip; 3646 regs->r_cs = tp->tf_cs; 3647 regs->r_eflags = tp->tf_eflags; 3648 regs->r_esp = tp->tf_esp; 3649 regs->r_ss = tp->tf_ss; 3650 return (0); 3651} 3652 3653int 3654set_regs(struct thread *td, struct reg *regs) 3655{ 3656 struct pcb *pcb; 3657 struct trapframe *tp; 3658 3659 tp = td->td_frame; 3660 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 3661 !CS_SECURE(regs->r_cs)) 3662 return (EINVAL); 3663 pcb = td->td_pcb; 3664 tp->tf_fs = regs->r_fs; 3665 tp->tf_es = regs->r_es; 3666 tp->tf_ds = regs->r_ds; 3667 tp->tf_edi = regs->r_edi; 3668 tp->tf_esi = regs->r_esi; 3669 tp->tf_ebp = regs->r_ebp; 3670 tp->tf_ebx = regs->r_ebx; 3671 tp->tf_edx = regs->r_edx; 3672 tp->tf_ecx = regs->r_ecx; 3673 tp->tf_eax = regs->r_eax; 3674 tp->tf_eip = regs->r_eip; 3675 tp->tf_cs = regs->r_cs; 3676 tp->tf_eflags = regs->r_eflags; 3677 tp->tf_esp = regs->r_esp; 3678 tp->tf_ss = regs->r_ss; 3679 pcb->pcb_gs = regs->r_gs; 3680 return (0); 3681} 3682 3683#ifdef CPU_ENABLE_SSE 3684static void 3685fill_fpregs_xmm(sv_xmm, sv_87) 3686 struct savexmm *sv_xmm; 3687 struct save87 *sv_87; 3688{ 3689 register struct env87 *penv_87 = &sv_87->sv_env; 3690 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 3691 int i; 3692 3693 bzero(sv_87, sizeof(*sv_87)); 3694 3695 /* FPU control/status */ 3696 penv_87->en_cw = penv_xmm->en_cw; 3697 penv_87->en_sw = penv_xmm->en_sw; 3698 penv_87->en_tw = penv_xmm->en_tw; 3699 penv_87->en_fip = penv_xmm->en_fip; 3700 penv_87->en_fcs = penv_xmm->en_fcs; 3701 penv_87->en_opcode = penv_xmm->en_opcode; 3702 penv_87->en_foo = penv_xmm->en_foo; 3703 penv_87->en_fos = penv_xmm->en_fos; 3704 3705 /* FPU registers */ 3706 for (i = 0; i < 8; ++i) 3707 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc; 3708} 3709 3710static void 3711set_fpregs_xmm(sv_87, sv_xmm) 3712 struct save87 *sv_87; 3713 struct savexmm *sv_xmm; 3714{ 3715 register struct env87 *penv_87 = &sv_87->sv_env; 3716 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 3717 int i; 3718 3719 /* FPU control/status */ 3720 penv_xmm->en_cw = penv_87->en_cw; 3721 penv_xmm->en_sw = penv_87->en_sw; 3722 penv_xmm->en_tw = penv_87->en_tw; 3723 penv_xmm->en_fip = penv_87->en_fip; 3724 penv_xmm->en_fcs = penv_87->en_fcs; 3725 penv_xmm->en_opcode = penv_87->en_opcode; 3726 penv_xmm->en_foo = penv_87->en_foo; 3727 penv_xmm->en_fos = penv_87->en_fos; 3728 3729 /* FPU registers */ 3730 for (i = 0; i < 8; ++i) 3731 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 3732} 3733#endif /* CPU_ENABLE_SSE */ 3734 3735int 3736fill_fpregs(struct thread *td, struct fpreg *fpregs) 3737{ 3738 3739 KASSERT(td == curthread || TD_IS_SUSPENDED(td) || 3740 P_SHOULDSTOP(td->td_proc), 3741 ("not suspended thread %p", td)); 3742#ifdef DEV_NPX 3743 npxgetregs(td); 3744#else 3745 bzero(fpregs, sizeof(*fpregs)); 3746#endif 3747#ifdef CPU_ENABLE_SSE 3748 if (cpu_fxsr) 3749 fill_fpregs_xmm(&get_pcb_user_save_td(td)->sv_xmm, 3750 (struct save87 *)fpregs); 3751 else 3752#endif /* CPU_ENABLE_SSE */ 3753 bcopy(&get_pcb_user_save_td(td)->sv_87, fpregs, 3754 sizeof(*fpregs)); 3755 return (0); 3756} 3757 3758int 3759set_fpregs(struct thread *td, struct fpreg *fpregs) 3760{ 3761 3762#ifdef CPU_ENABLE_SSE 3763 if (cpu_fxsr) 3764 set_fpregs_xmm((struct save87 *)fpregs, 3765 &get_pcb_user_save_td(td)->sv_xmm); 3766 else 3767#endif /* CPU_ENABLE_SSE */ 3768 bcopy(fpregs, &get_pcb_user_save_td(td)->sv_87, 3769 sizeof(*fpregs)); 3770#ifdef DEV_NPX 3771 npxuserinited(td); 3772#endif 3773 return (0); 3774} 3775 3776/* 3777 * Get machine context. 3778 */ 3779int 3780get_mcontext(struct thread *td, mcontext_t *mcp, int flags) 3781{ 3782 struct trapframe *tp; 3783 struct segment_descriptor *sdp; 3784 3785 tp = td->td_frame; 3786 3787 PROC_LOCK(curthread->td_proc); 3788 mcp->mc_onstack = sigonstack(tp->tf_esp); 3789 PROC_UNLOCK(curthread->td_proc); 3790 mcp->mc_gs = td->td_pcb->pcb_gs; 3791 mcp->mc_fs = tp->tf_fs; 3792 mcp->mc_es = tp->tf_es; 3793 mcp->mc_ds = tp->tf_ds; 3794 mcp->mc_edi = tp->tf_edi; 3795 mcp->mc_esi = tp->tf_esi; 3796 mcp->mc_ebp = tp->tf_ebp; 3797 mcp->mc_isp = tp->tf_isp; 3798 mcp->mc_eflags = tp->tf_eflags; 3799 if (flags & GET_MC_CLEAR_RET) { 3800 mcp->mc_eax = 0; 3801 mcp->mc_edx = 0; 3802 mcp->mc_eflags &= ~PSL_C; 3803 } else { 3804 mcp->mc_eax = tp->tf_eax; 3805 mcp->mc_edx = tp->tf_edx; 3806 } 3807 mcp->mc_ebx = tp->tf_ebx; 3808 mcp->mc_ecx = tp->tf_ecx; 3809 mcp->mc_eip = tp->tf_eip; 3810 mcp->mc_cs = tp->tf_cs; 3811 mcp->mc_esp = tp->tf_esp; 3812 mcp->mc_ss = tp->tf_ss; 3813 mcp->mc_len = sizeof(*mcp); 3814 get_fpcontext(td, mcp, NULL, 0); 3815 sdp = &td->td_pcb->pcb_fsd; 3816 mcp->mc_fsbase = sdp->sd_hibase << 24 | sdp->sd_lobase; 3817 sdp = &td->td_pcb->pcb_gsd; 3818 mcp->mc_gsbase = sdp->sd_hibase << 24 | sdp->sd_lobase; 3819 mcp->mc_flags = 0; 3820 mcp->mc_xfpustate = 0; 3821 mcp->mc_xfpustate_len = 0; 3822 bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2)); 3823 return (0); 3824} 3825 3826/* 3827 * Set machine context. 3828 * 3829 * However, we don't set any but the user modifiable flags, and we won't 3830 * touch the cs selector. 3831 */ 3832int 3833set_mcontext(struct thread *td, mcontext_t *mcp) 3834{ 3835 struct trapframe *tp; 3836 char *xfpustate; 3837 int eflags, ret; 3838 3839 tp = td->td_frame; 3840 if (mcp->mc_len != sizeof(*mcp) || 3841 (mcp->mc_flags & ~_MC_FLAG_MASK) != 0) 3842 return (EINVAL); 3843 eflags = (mcp->mc_eflags & PSL_USERCHANGE) | 3844 (tp->tf_eflags & ~PSL_USERCHANGE); 3845 if (mcp->mc_flags & _MC_HASFPXSTATE) { 3846 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size - 3847 sizeof(union savefpu)) 3848 return (EINVAL); 3849 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len); 3850 ret = copyin((void *)mcp->mc_xfpustate, xfpustate, 3851 mcp->mc_xfpustate_len); 3852 if (ret != 0) 3853 return (ret); 3854 } else 3855 xfpustate = NULL; 3856 ret = set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len); 3857 if (ret != 0) 3858 return (ret); 3859 tp->tf_fs = mcp->mc_fs; 3860 tp->tf_es = mcp->mc_es; 3861 tp->tf_ds = mcp->mc_ds; 3862 tp->tf_edi = mcp->mc_edi; 3863 tp->tf_esi = mcp->mc_esi; 3864 tp->tf_ebp = mcp->mc_ebp; 3865 tp->tf_ebx = mcp->mc_ebx; 3866 tp->tf_edx = mcp->mc_edx; 3867 tp->tf_ecx = mcp->mc_ecx; 3868 tp->tf_eax = mcp->mc_eax; 3869 tp->tf_eip = mcp->mc_eip; 3870 tp->tf_eflags = eflags; 3871 tp->tf_esp = mcp->mc_esp; 3872 tp->tf_ss = mcp->mc_ss; 3873 td->td_pcb->pcb_gs = mcp->mc_gs; 3874 return (0); 3875} 3876 3877static void 3878get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave, 3879 size_t xfpusave_len) 3880{ 3881#ifdef CPU_ENABLE_SSE 3882 size_t max_len, len; 3883#endif 3884 3885#ifndef DEV_NPX 3886 mcp->mc_fpformat = _MC_FPFMT_NODEV; 3887 mcp->mc_ownedfp = _MC_FPOWNED_NONE; 3888 bzero(mcp->mc_fpstate, sizeof(mcp->mc_fpstate)); 3889#else 3890 mcp->mc_ownedfp = npxgetregs(td); 3891 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0], 3892 sizeof(mcp->mc_fpstate)); 3893 mcp->mc_fpformat = npxformat(); 3894#ifdef CPU_ENABLE_SSE 3895 if (!use_xsave || xfpusave_len == 0) 3896 return; 3897 max_len = cpu_max_ext_state_size - sizeof(union savefpu); 3898 len = xfpusave_len; 3899 if (len > max_len) { 3900 len = max_len; 3901 bzero(xfpusave + max_len, len - max_len); 3902 } 3903 mcp->mc_flags |= _MC_HASFPXSTATE; 3904 mcp->mc_xfpustate_len = len; 3905 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len); 3906#endif 3907#endif 3908} 3909 3910static int 3911set_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpustate, 3912 size_t xfpustate_len) 3913{ 3914 union savefpu *fpstate; 3915 int error; 3916 3917 if (mcp->mc_fpformat == _MC_FPFMT_NODEV) 3918 return (0); 3919 else if (mcp->mc_fpformat != _MC_FPFMT_387 && 3920 mcp->mc_fpformat != _MC_FPFMT_XMM) 3921 return (EINVAL); 3922 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) { 3923 /* We don't care what state is left in the FPU or PCB. */ 3924 fpstate_drop(td); 3925 error = 0; 3926 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU || 3927 mcp->mc_ownedfp == _MC_FPOWNED_PCB) { 3928#ifdef DEV_NPX 3929 fpstate = (union savefpu *)&mcp->mc_fpstate; 3930#ifdef CPU_ENABLE_SSE 3931 if (cpu_fxsr) 3932 fpstate->sv_xmm.sv_env.en_mxcsr &= cpu_mxcsr_mask; 3933#endif 3934 error = npxsetregs(td, fpstate, xfpustate, xfpustate_len); 3935#else 3936 error = EINVAL; 3937#endif 3938 } else 3939 return (EINVAL); 3940 return (error); 3941} 3942 3943static void 3944fpstate_drop(struct thread *td) 3945{ 3946 3947 KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu")); 3948 critical_enter(); 3949#ifdef DEV_NPX 3950 if (PCPU_GET(fpcurthread) == td) 3951 npxdrop(); 3952#endif 3953 /* 3954 * XXX force a full drop of the npx. The above only drops it if we 3955 * owned it. npxgetregs() has the same bug in the !cpu_fxsr case. 3956 * 3957 * XXX I don't much like npxgetregs()'s semantics of doing a full 3958 * drop. Dropping only to the pcb matches fnsave's behaviour. 3959 * We only need to drop to !PCB_INITDONE in sendsig(). But 3960 * sendsig() is the only caller of npxgetregs()... perhaps we just 3961 * have too many layers. 3962 */ 3963 curthread->td_pcb->pcb_flags &= ~(PCB_NPXINITDONE | 3964 PCB_NPXUSERINITDONE); 3965 critical_exit(); 3966} 3967 3968int 3969fill_dbregs(struct thread *td, struct dbreg *dbregs) 3970{ 3971 struct pcb *pcb; 3972 3973 if (td == NULL) { 3974 dbregs->dr[0] = rdr0(); 3975 dbregs->dr[1] = rdr1(); 3976 dbregs->dr[2] = rdr2(); 3977 dbregs->dr[3] = rdr3(); 3978 dbregs->dr[4] = rdr4(); 3979 dbregs->dr[5] = rdr5(); 3980 dbregs->dr[6] = rdr6(); 3981 dbregs->dr[7] = rdr7(); 3982 } else { 3983 pcb = td->td_pcb; 3984 dbregs->dr[0] = pcb->pcb_dr0; 3985 dbregs->dr[1] = pcb->pcb_dr1; 3986 dbregs->dr[2] = pcb->pcb_dr2; 3987 dbregs->dr[3] = pcb->pcb_dr3; 3988 dbregs->dr[4] = 0; 3989 dbregs->dr[5] = 0; 3990 dbregs->dr[6] = pcb->pcb_dr6; 3991 dbregs->dr[7] = pcb->pcb_dr7; 3992 } 3993 return (0); 3994} 3995 3996int 3997set_dbregs(struct thread *td, struct dbreg *dbregs) 3998{ 3999 struct pcb *pcb; 4000 int i; 4001 4002 if (td == NULL) { 4003 load_dr0(dbregs->dr[0]); 4004 load_dr1(dbregs->dr[1]); 4005 load_dr2(dbregs->dr[2]); 4006 load_dr3(dbregs->dr[3]); 4007 load_dr4(dbregs->dr[4]); 4008 load_dr5(dbregs->dr[5]); 4009 load_dr6(dbregs->dr[6]); 4010 load_dr7(dbregs->dr[7]); 4011 } else { 4012 /* 4013 * Don't let an illegal value for dr7 get set. Specifically, 4014 * check for undefined settings. Setting these bit patterns 4015 * result in undefined behaviour and can lead to an unexpected 4016 * TRCTRAP. 4017 */ 4018 for (i = 0; i < 4; i++) { 4019 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02) 4020 return (EINVAL); 4021 if (DBREG_DR7_LEN(dbregs->dr[7], i) == 0x02) 4022 return (EINVAL); 4023 } 4024 4025 pcb = td->td_pcb; 4026 4027 /* 4028 * Don't let a process set a breakpoint that is not within the 4029 * process's address space. If a process could do this, it 4030 * could halt the system by setting a breakpoint in the kernel 4031 * (if ddb was enabled). Thus, we need to check to make sure 4032 * that no breakpoints are being enabled for addresses outside 4033 * process's address space. 4034 * 4035 * XXX - what about when the watched area of the user's 4036 * address space is written into from within the kernel 4037 * ... wouldn't that still cause a breakpoint to be generated 4038 * from within kernel mode? 4039 */ 4040 4041 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) { 4042 /* dr0 is enabled */ 4043 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS) 4044 return (EINVAL); 4045 } 4046 4047 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) { 4048 /* dr1 is enabled */ 4049 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS) 4050 return (EINVAL); 4051 } 4052 4053 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) { 4054 /* dr2 is enabled */ 4055 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS) 4056 return (EINVAL); 4057 } 4058 4059 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) { 4060 /* dr3 is enabled */ 4061 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS) 4062 return (EINVAL); 4063 } 4064 4065 pcb->pcb_dr0 = dbregs->dr[0]; 4066 pcb->pcb_dr1 = dbregs->dr[1]; 4067 pcb->pcb_dr2 = dbregs->dr[2]; 4068 pcb->pcb_dr3 = dbregs->dr[3]; 4069 pcb->pcb_dr6 = dbregs->dr[6]; 4070 pcb->pcb_dr7 = dbregs->dr[7]; 4071 4072 pcb->pcb_flags |= PCB_DBREGS; 4073 } 4074 4075 return (0); 4076} 4077 4078/* 4079 * Return > 0 if a hardware breakpoint has been hit, and the 4080 * breakpoint was in user space. Return 0, otherwise. 4081 */ 4082int 4083user_dbreg_trap(void) 4084{ 4085 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 4086 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 4087 int nbp; /* number of breakpoints that triggered */ 4088 caddr_t addr[4]; /* breakpoint addresses */ 4089 int i; 4090 4091 dr7 = rdr7(); 4092 if ((dr7 & 0x000000ff) == 0) { 4093 /* 4094 * all GE and LE bits in the dr7 register are zero, 4095 * thus the trap couldn't have been caused by the 4096 * hardware debug registers 4097 */ 4098 return 0; 4099 } 4100 4101 nbp = 0; 4102 dr6 = rdr6(); 4103 bp = dr6 & 0x0000000f; 4104 4105 if (!bp) { 4106 /* 4107 * None of the breakpoint bits are set meaning this 4108 * trap was not caused by any of the debug registers 4109 */ 4110 return 0; 4111 } 4112 4113 /* 4114 * at least one of the breakpoints were hit, check to see 4115 * which ones and if any of them are user space addresses 4116 */ 4117 4118 if (bp & 0x01) { 4119 addr[nbp++] = (caddr_t)rdr0(); 4120 } 4121 if (bp & 0x02) { 4122 addr[nbp++] = (caddr_t)rdr1(); 4123 } 4124 if (bp & 0x04) { 4125 addr[nbp++] = (caddr_t)rdr2(); 4126 } 4127 if (bp & 0x08) { 4128 addr[nbp++] = (caddr_t)rdr3(); 4129 } 4130 4131 for (i = 0; i < nbp; i++) { 4132 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) { 4133 /* 4134 * addr[i] is in user space 4135 */ 4136 return nbp; 4137 } 4138 } 4139 4140 /* 4141 * None of the breakpoints are in user space. 4142 */ 4143 return 0; 4144} 4145 4146#ifdef KDB 4147 4148/* 4149 * Provide inb() and outb() as functions. They are normally only available as 4150 * inline functions, thus cannot be called from the debugger. 4151 */ 4152 4153/* silence compiler warnings */ 4154u_char inb_(u_short); 4155void outb_(u_short, u_char); 4156 4157u_char 4158inb_(u_short port) 4159{ 4160 return inb(port); 4161} 4162 4163void 4164outb_(u_short port, u_char data) 4165{ 4166 outb(port, data); 4167} 4168 4169#endif /* KDB */ 4170