1/*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1982, 1986 The Regents of the University of California. 5 * Copyright (c) 1989, 1990 William Jolitz 6 * Copyright (c) 1994 John Dyson 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * the Systems Programming Group of the University of Utah Computer 11 * Science Department, and William Jolitz. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 42 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ 43 */ 44 45#include <sys/cdefs.h> 46__FBSDID("$FreeBSD$"); 47 48#include "opt_isa.h" 49#include "opt_cpu.h" 50 51#include <sys/param.h> 52#include <sys/systm.h> 53#include <sys/bio.h> 54#include <sys/buf.h> 55#include <sys/kernel.h> 56#include <sys/ktr.h> 57#include <sys/lock.h> 58#include <sys/malloc.h> 59#include <sys/mbuf.h> 60#include <sys/mutex.h> 61#include <sys/priv.h> 62#include <sys/proc.h> 63#include <sys/procctl.h> 64#include <sys/smp.h> 65#include <sys/sysctl.h> 66#include <sys/sysent.h> 67#include <sys/unistd.h> 68#include <sys/vnode.h> 69#include <sys/vmmeter.h> 70#include <sys/wait.h> 71 72#include <machine/cpu.h> 73#include <machine/md_var.h> 74#include <machine/pcb.h> 75#include <machine/smp.h> 76#include <machine/specialreg.h> 77#include <machine/tss.h> 78 79#include <vm/vm.h> 80#include <vm/vm_extern.h> 81#include <vm/vm_kern.h> 82#include <vm/vm_page.h> 83#include <vm/vm_map.h> 84#include <vm/vm_param.h> 85 86_Static_assert(OFFSETOF_MONITORBUF == offsetof(struct pcpu, pc_monitorbuf), 87 "OFFSETOF_MONITORBUF does not correspond with offset of pc_monitorbuf."); 88 89void 90set_top_of_stack_td(struct thread *td) 91{ 92 td->td_md.md_stack_base = td->td_kstack + 93 td->td_kstack_pages * PAGE_SIZE - 94 roundup2(cpu_max_ext_state_size, XSAVE_AREA_ALIGN); 95} 96 97struct savefpu * 98get_pcb_user_save_td(struct thread *td) 99{ 100 vm_offset_t p; 101 102 p = td->td_md.md_stack_base; 103 KASSERT((p % XSAVE_AREA_ALIGN) == 0, 104 ("Unaligned pcb_user_save area ptr %#lx td %p", p, td)); 105 return ((struct savefpu *)p); 106} 107 108struct pcb * 109get_pcb_td(struct thread *td) 110{ 111 112 return (&td->td_md.md_pcb); 113} 114 115struct savefpu * 116get_pcb_user_save_pcb(struct pcb *pcb) 117{ 118 struct thread *td; 119 120 td = __containerof(pcb, struct thread, td_md.md_pcb); 121 return (get_pcb_user_save_td(td)); 122} 123 124void * 125alloc_fpusave(int flags) 126{ 127 void *res; 128 struct savefpu_ymm *sf; 129 130 res = malloc(cpu_max_ext_state_size, M_DEVBUF, flags); 131 if (use_xsave) { 132 sf = (struct savefpu_ymm *)res; 133 bzero(&sf->sv_xstate.sx_hd, sizeof(sf->sv_xstate.sx_hd)); 134 sf->sv_xstate.sx_hd.xstate_bv = xsave_mask; 135 } 136 return (res); 137} 138 139/* 140 * Common code shared between cpu_fork() and cpu_copy_thread() for 141 * initializing a thread. 142 */ 143static void 144copy_thread(struct thread *td1, struct thread *td2) 145{ 146 struct pcb *pcb2; 147 148 pcb2 = td2->td_pcb; 149 150 /* Ensure that td1's pcb is up to date for user threads. */ 151 if ((td2->td_pflags & TDP_KTHREAD) == 0) { 152 MPASS(td1 == curthread); 153 fpuexit(td1); 154 update_pcb_bases(td1->td_pcb); 155 } 156 157 /* Copy td1's pcb */ 158 bcopy(td1->td_pcb, pcb2, sizeof(*pcb2)); 159 160 /* Properly initialize pcb_save */ 161 pcb2->pcb_save = get_pcb_user_save_pcb(pcb2); 162 163 /* Kernel threads start with clean FPU and segment bases. */ 164 if ((td2->td_pflags & TDP_KTHREAD) != 0) { 165 pcb2->pcb_fsbase = 0; 166 pcb2->pcb_gsbase = 0; 167 clear_pcb_flags(pcb2, PCB_FPUINITDONE | PCB_USERFPUINITDONE | 168 PCB_KERNFPU | PCB_KERNFPU_THR); 169 } else { 170 MPASS((pcb2->pcb_flags & (PCB_KERNFPU | PCB_KERNFPU_THR)) == 0); 171 bcopy(get_pcb_user_save_td(td1), get_pcb_user_save_pcb(pcb2), 172 cpu_max_ext_state_size); 173 } 174 175 /* 176 * Set registers for trampoline to user mode. Leave space for the 177 * return address on stack. These are the kernel mode register values. 178 */ 179 pcb2->pcb_r12 = (register_t)fork_return; /* fork_trampoline argument */ 180 pcb2->pcb_rbp = 0; 181 pcb2->pcb_rsp = (register_t)td2->td_frame - sizeof(void *); 182 pcb2->pcb_rbx = (register_t)td2; /* fork_trampoline argument */ 183 pcb2->pcb_rip = (register_t)fork_trampoline; 184 /*- 185 * pcb2->pcb_dr*: cloned above. 186 * pcb2->pcb_savefpu: cloned above. 187 * pcb2->pcb_flags: cloned above. 188 * pcb2->pcb_onfault: cloned above (always NULL here?). 189 * pcb2->pcb_[fg]sbase: cloned above 190 */ 191 192 pcb2->pcb_tssp = NULL; 193 194 /* Setup to release spin count in fork_exit(). */ 195 td2->td_md.md_spinlock_count = 1; 196 td2->td_md.md_saved_flags = PSL_KERNEL | PSL_I; 197 pmap_thread_init_invl_gen(td2); 198} 199 200/* 201 * Finish a fork operation, with process p2 nearly set up. 202 * Copy and update the pcb, set up the stack so that the child 203 * ready to run and return to user mode. 204 */ 205void 206cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) 207{ 208 struct proc *p1; 209 struct pcb *pcb2; 210 struct mdproc *mdp1, *mdp2; 211 struct proc_ldt *pldt; 212 213 p1 = td1->td_proc; 214 if ((flags & RFPROC) == 0) { 215 if ((flags & RFMEM) == 0) { 216 /* unshare user LDT */ 217 mdp1 = &p1->p_md; 218 mtx_lock(&dt_lock); 219 if ((pldt = mdp1->md_ldt) != NULL && 220 pldt->ldt_refcnt > 1 && 221 user_ldt_alloc(p1, 1) == NULL) 222 panic("could not copy LDT"); 223 mtx_unlock(&dt_lock); 224 } 225 return; 226 } 227 228 /* Point the stack and pcb to the actual location */ 229 set_top_of_stack_td(td2); 230 td2->td_pcb = pcb2 = get_pcb_td(td2); 231 232 copy_thread(td1, td2); 233 234 /* Reset debug registers in the new process */ 235 x86_clear_dbregs(pcb2); 236 237 /* Point mdproc and then copy over p1's contents */ 238 mdp2 = &p2->p_md; 239 bcopy(&p1->p_md, mdp2, sizeof(*mdp2)); 240 241 /* 242 * Copy the trap frame for the return to user mode as if from a 243 * syscall. This copies most of the user mode register values. 244 */ 245 td2->td_frame = (struct trapframe *)td2->td_md.md_stack_base - 1; 246 bcopy(td1->td_frame, td2->td_frame, sizeof(struct trapframe)); 247 248 td2->td_frame->tf_rax = 0; /* Child returns zero */ 249 td2->td_frame->tf_rflags &= ~PSL_C; /* success */ 250 td2->td_frame->tf_rdx = 1; 251 252 /* 253 * If the parent process has the trap bit set (i.e. a debugger 254 * had single stepped the process to the system call), we need 255 * to clear the trap flag from the new frame. 256 */ 257 td2->td_frame->tf_rflags &= ~PSL_T; 258 259 /* As on i386, do not copy io permission bitmap. */ 260 pcb2->pcb_tssp = NULL; 261 262 /* New segment registers. */ 263 set_pcb_flags_raw(pcb2, PCB_FULL_IRET); 264 265 /* Copy the LDT, if necessary. */ 266 mdp1 = &td1->td_proc->p_md; 267 mdp2 = &p2->p_md; 268 if (mdp1->md_ldt == NULL) { 269 mdp2->md_ldt = NULL; 270 return; 271 } 272 mtx_lock(&dt_lock); 273 if (mdp1->md_ldt != NULL) { 274 if (flags & RFMEM) { 275 mdp1->md_ldt->ldt_refcnt++; 276 mdp2->md_ldt = mdp1->md_ldt; 277 bcopy(&mdp1->md_ldt_sd, &mdp2->md_ldt_sd, sizeof(struct 278 system_segment_descriptor)); 279 } else { 280 mdp2->md_ldt = NULL; 281 mdp2->md_ldt = user_ldt_alloc(p2, 0); 282 if (mdp2->md_ldt == NULL) 283 panic("could not copy LDT"); 284 amd64_set_ldt_data(td2, 0, max_ldt_segment, 285 (struct user_segment_descriptor *) 286 mdp1->md_ldt->ldt_base); 287 } 288 } else 289 mdp2->md_ldt = NULL; 290 mtx_unlock(&dt_lock); 291 292 /* 293 * Now, cpu_switch() can schedule the new process. 294 * pcb_rsp is loaded pointing to the cpu_switch() stack frame 295 * containing the return address when exiting cpu_switch. 296 * This will normally be to fork_trampoline(), which will have 297 * %rbx loaded with the new proc's pointer. fork_trampoline() 298 * will set up a stack to call fork_return(p, frame); to complete 299 * the return to user-mode. 300 */ 301} 302 303/* 304 * Intercept the return address from a freshly forked process that has NOT 305 * been scheduled yet. 306 * 307 * This is needed to make kernel threads stay in kernel mode. 308 */ 309void 310cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg) 311{ 312 /* 313 * Note that the trap frame follows the args, so the function 314 * is really called like this: func(arg, frame); 315 */ 316 td->td_pcb->pcb_r12 = (long) func; /* function */ 317 td->td_pcb->pcb_rbx = (long) arg; /* first arg */ 318} 319 320void 321cpu_exit(struct thread *td) 322{ 323 324 /* 325 * If this process has a custom LDT, release it. 326 */ 327 if (td->td_proc->p_md.md_ldt != NULL) 328 user_ldt_free(td); 329} 330 331void 332cpu_thread_exit(struct thread *td) 333{ 334 struct pcb *pcb; 335 336 critical_enter(); 337 if (td == PCPU_GET(fpcurthread)) 338 fpudrop(); 339 critical_exit(); 340 341 pcb = td->td_pcb; 342 343 /* Disable any hardware breakpoints. */ 344 if (pcb->pcb_flags & PCB_DBREGS) { 345 reset_dbregs(); 346 clear_pcb_flags(pcb, PCB_DBREGS); 347 } 348} 349 350void 351cpu_thread_clean(struct thread *td) 352{ 353 struct pcb *pcb; 354 355 pcb = td->td_pcb; 356 357 /* 358 * Clean TSS/iomap 359 */ 360 if (pcb->pcb_tssp != NULL) { 361 pmap_pti_remove_kva((vm_offset_t)pcb->pcb_tssp, 362 (vm_offset_t)pcb->pcb_tssp + ctob(IOPAGES + 1)); 363 kmem_free((vm_offset_t)pcb->pcb_tssp, ctob(IOPAGES + 1)); 364 pcb->pcb_tssp = NULL; 365 } 366} 367 368void 369cpu_thread_swapin(struct thread *td) 370{ 371} 372 373void 374cpu_thread_swapout(struct thread *td) 375{ 376} 377 378void 379cpu_thread_alloc(struct thread *td) 380{ 381 struct pcb *pcb; 382 struct xstate_hdr *xhdr; 383 384 set_top_of_stack_td(td); 385 td->td_pcb = pcb = get_pcb_td(td); 386 td->td_frame = (struct trapframe *)td->td_md.md_stack_base - 1; 387 pcb->pcb_save = get_pcb_user_save_pcb(pcb); 388 if (use_xsave) { 389 xhdr = (struct xstate_hdr *)(pcb->pcb_save + 1); 390 bzero(xhdr, sizeof(*xhdr)); 391 xhdr->xstate_bv = xsave_mask; 392 } 393} 394 395void 396cpu_thread_free(struct thread *td) 397{ 398 399 cpu_thread_clean(td); 400} 401 402bool 403cpu_exec_vmspace_reuse(struct proc *p, vm_map_t map) 404{ 405 406 return (((curproc->p_md.md_flags & P_MD_KPTI) != 0) == 407 (vm_map_pmap(map)->pm_ucr3 != PMAP_NO_CR3)); 408} 409 410static void 411cpu_procctl_kpti_ctl(struct proc *p, int val) 412{ 413 414 if (pti && val == PROC_KPTI_CTL_ENABLE_ON_EXEC) 415 p->p_md.md_flags |= P_MD_KPTI; 416 if (val == PROC_KPTI_CTL_DISABLE_ON_EXEC) 417 p->p_md.md_flags &= ~P_MD_KPTI; 418} 419 420static void 421cpu_procctl_kpti_status(struct proc *p, int *val) 422{ 423 *val = (p->p_md.md_flags & P_MD_KPTI) != 0 ? 424 PROC_KPTI_CTL_ENABLE_ON_EXEC: 425 PROC_KPTI_CTL_DISABLE_ON_EXEC; 426 if (vmspace_pmap(p->p_vmspace)->pm_ucr3 != PMAP_NO_CR3) 427 *val |= PROC_KPTI_STATUS_ACTIVE; 428} 429 430static int 431cpu_procctl_la_ctl(struct proc *p, int val) 432{ 433 int error; 434 435 error = 0; 436 switch (val) { 437 case PROC_LA_CTL_LA48_ON_EXEC: 438 p->p_md.md_flags |= P_MD_LA48; 439 p->p_md.md_flags &= ~P_MD_LA57; 440 break; 441 case PROC_LA_CTL_LA57_ON_EXEC: 442 if (la57) { 443 p->p_md.md_flags &= ~P_MD_LA48; 444 p->p_md.md_flags |= P_MD_LA57; 445 } else { 446 error = ENOTSUP; 447 } 448 break; 449 case PROC_LA_CTL_DEFAULT_ON_EXEC: 450 p->p_md.md_flags &= ~(P_MD_LA48 | P_MD_LA57); 451 break; 452 } 453 return (error); 454} 455 456static void 457cpu_procctl_la_status(struct proc *p, int *val) 458{ 459 int res; 460 461 if ((p->p_md.md_flags & P_MD_LA48) != 0) 462 res = PROC_LA_CTL_LA48_ON_EXEC; 463 else if ((p->p_md.md_flags & P_MD_LA57) != 0) 464 res = PROC_LA_CTL_LA57_ON_EXEC; 465 else 466 res = PROC_LA_CTL_DEFAULT_ON_EXEC; 467 if (p->p_sysent->sv_maxuser == VM_MAXUSER_ADDRESS_LA48) 468 res |= PROC_LA_STATUS_LA48; 469 else 470 res |= PROC_LA_STATUS_LA57; 471 *val = res; 472} 473 474int 475cpu_procctl(struct thread *td, int idtype, id_t id, int com, void *data) 476{ 477 struct proc *p; 478 int error, val; 479 480 switch (com) { 481 case PROC_KPTI_CTL: 482 case PROC_KPTI_STATUS: 483 case PROC_LA_CTL: 484 case PROC_LA_STATUS: 485 if (idtype != P_PID) { 486 error = EINVAL; 487 break; 488 } 489 if (com == PROC_KPTI_CTL) { 490 /* sad but true and not a joke */ 491 error = priv_check(td, PRIV_IO); 492 if (error != 0) 493 break; 494 } 495 if (com == PROC_KPTI_CTL || com == PROC_LA_CTL) { 496 error = copyin(data, &val, sizeof(val)); 497 if (error != 0) 498 break; 499 } 500 if (com == PROC_KPTI_CTL && 501 val != PROC_KPTI_CTL_ENABLE_ON_EXEC && 502 val != PROC_KPTI_CTL_DISABLE_ON_EXEC) { 503 error = EINVAL; 504 break; 505 } 506 if (com == PROC_LA_CTL && 507 val != PROC_LA_CTL_LA48_ON_EXEC && 508 val != PROC_LA_CTL_LA57_ON_EXEC && 509 val != PROC_LA_CTL_DEFAULT_ON_EXEC) { 510 error = EINVAL; 511 break; 512 } 513 error = pget(id, PGET_CANSEE | PGET_NOTWEXIT | PGET_NOTID, &p); 514 if (error != 0) 515 break; 516 switch (com) { 517 case PROC_KPTI_CTL: 518 cpu_procctl_kpti_ctl(p, val); 519 break; 520 case PROC_KPTI_STATUS: 521 cpu_procctl_kpti_status(p, &val); 522 break; 523 case PROC_LA_CTL: 524 error = cpu_procctl_la_ctl(p, val); 525 break; 526 case PROC_LA_STATUS: 527 cpu_procctl_la_status(p, &val); 528 break; 529 } 530 PROC_UNLOCK(p); 531 if (com == PROC_KPTI_STATUS || com == PROC_LA_STATUS) 532 error = copyout(&val, data, sizeof(val)); 533 break; 534 default: 535 error = EINVAL; 536 break; 537 } 538 return (error); 539} 540 541void 542cpu_set_syscall_retval(struct thread *td, int error) 543{ 544 struct trapframe *frame; 545 546 frame = td->td_frame; 547 if (__predict_true(error == 0)) { 548 frame->tf_rax = td->td_retval[0]; 549 frame->tf_rdx = td->td_retval[1]; 550 frame->tf_rflags &= ~PSL_C; 551 return; 552 } 553 554 switch (error) { 555 case ERESTART: 556 /* 557 * Reconstruct pc, we know that 'syscall' is 2 bytes, 558 * lcall $X,y is 7 bytes, int 0x80 is 2 bytes. 559 * We saved this in tf_err. 560 * %r10 (which was holding the value of %rcx) is restored 561 * for the next iteration. 562 * %r10 restore is only required for freebsd/amd64 processes, 563 * but shall be innocent for any ia32 ABI. 564 * 565 * Require full context restore to get the arguments 566 * in the registers reloaded at return to usermode. 567 */ 568 frame->tf_rip -= frame->tf_err; 569 frame->tf_r10 = frame->tf_rcx; 570 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 571 break; 572 573 case EJUSTRETURN: 574 break; 575 576 default: 577 frame->tf_rax = error; 578 frame->tf_rflags |= PSL_C; 579 break; 580 } 581} 582 583/* 584 * Initialize machine state, mostly pcb and trap frame for a new 585 * thread, about to return to userspace. Put enough state in the new 586 * thread's PCB to get it to go back to the fork_return(), which 587 * finalizes the thread state and handles peculiarities of the first 588 * return to userspace for the new thread. 589 */ 590void 591cpu_copy_thread(struct thread *td, struct thread *td0) 592{ 593 copy_thread(td0, td); 594 595 /* 596 * Copy user general-purpose registers. 597 * 598 * Some of these registers are rewritten by cpu_set_upcall() 599 * and linux_set_upcall(). 600 */ 601 bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe)); 602 603 /* If the current thread has the trap bit set (i.e. a debugger had 604 * single stepped the process to the system call), we need to clear 605 * the trap flag from the new frame. Otherwise, the new thread will 606 * receive a (likely unexpected) SIGTRAP when it executes the first 607 * instruction after returning to userland. 608 */ 609 td->td_frame->tf_rflags &= ~PSL_T; 610 611 set_pcb_flags_raw(td->td_pcb, PCB_FULL_IRET); 612} 613 614/* 615 * Set that machine state for performing an upcall that starts 616 * the entry function with the given argument. 617 */ 618void 619cpu_set_upcall(struct thread *td, void (*entry)(void *), void *arg, 620 stack_t *stack) 621{ 622 623 /* 624 * Do any extra cleaning that needs to be done. 625 * The thread may have optional components 626 * that are not present in a fresh thread. 627 * This may be a recycled thread so make it look 628 * as though it's newly allocated. 629 */ 630 cpu_thread_clean(td); 631 632#ifdef COMPAT_FREEBSD32 633 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 634 /* 635 * Set the trap frame to point at the beginning of the entry 636 * function. 637 */ 638 td->td_frame->tf_rbp = 0; 639 td->td_frame->tf_rsp = 640 (((uintptr_t)stack->ss_sp + stack->ss_size - 4) & ~0x0f) - 4; 641 td->td_frame->tf_rip = (uintptr_t)entry; 642 643 /* Return address sentinel value to stop stack unwinding. */ 644 suword32((void *)td->td_frame->tf_rsp, 0); 645 646 /* Pass the argument to the entry point. */ 647 suword32((void *)(td->td_frame->tf_rsp + sizeof(int32_t)), 648 (uint32_t)(uintptr_t)arg); 649 650 return; 651 } 652#endif 653 654 /* 655 * Set the trap frame to point at the beginning of the uts 656 * function. 657 */ 658 td->td_frame->tf_rbp = 0; 659 td->td_frame->tf_rsp = 660 ((register_t)stack->ss_sp + stack->ss_size) & ~0x0f; 661 td->td_frame->tf_rsp -= 8; 662 td->td_frame->tf_rip = (register_t)entry; 663 td->td_frame->tf_ds = _udatasel; 664 td->td_frame->tf_es = _udatasel; 665 td->td_frame->tf_fs = _ufssel; 666 td->td_frame->tf_gs = _ugssel; 667 td->td_frame->tf_flags = TF_HASSEGS; 668 669 /* Return address sentinel value to stop stack unwinding. */ 670 suword((void *)td->td_frame->tf_rsp, 0); 671 672 /* Pass the argument to the entry point. */ 673 td->td_frame->tf_rdi = (register_t)arg; 674} 675 676int 677cpu_set_user_tls(struct thread *td, void *tls_base) 678{ 679 struct pcb *pcb; 680 681 if ((u_int64_t)tls_base >= VM_MAXUSER_ADDRESS) 682 return (EINVAL); 683 684 pcb = td->td_pcb; 685 set_pcb_flags(pcb, PCB_FULL_IRET); 686#ifdef COMPAT_FREEBSD32 687 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 688 pcb->pcb_gsbase = (register_t)tls_base; 689 return (0); 690 } 691#endif 692 pcb->pcb_fsbase = (register_t)tls_base; 693 return (0); 694} 695 696/* 697 * Software interrupt handler for queued VM system processing. 698 */ 699void 700swi_vm(void *dummy) 701{ 702 if (busdma_swi_pending != 0) 703 busdma_swi(); 704} 705 706/* 707 * Tell whether this address is in some physical memory region. 708 * Currently used by the kernel coredump code in order to avoid 709 * dumping the ``ISA memory hole'' which could cause indefinite hangs, 710 * or other unpredictable behaviour. 711 */ 712 713int 714is_physical_memory(vm_paddr_t addr) 715{ 716 717#ifdef DEV_ISA 718 /* The ISA ``memory hole''. */ 719 if (addr >= 0xa0000 && addr < 0x100000) 720 return 0; 721#endif 722 723 /* 724 * stuff other tests for known memory-mapped devices (PCI?) 725 * here 726 */ 727 728 return 1; 729} 730