pmap.c revision 270439
1/*- 2 * Copyright (C) 2007-2009 Semihalf, Rafal Jaworowski <raj@semihalf.com> 3 * Copyright (C) 2006 Semihalf, Marian Balakowicz <m8@semihalf.com> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 18 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 20 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 22 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 23 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 24 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * Some hw specific parts of this pmap were derived or influenced 27 * by NetBSD's ibm4xx pmap module. More generic code is shared with 28 * a few other pmap modules from the FreeBSD tree. 29 */ 30 31 /* 32 * VM layout notes: 33 * 34 * Kernel and user threads run within one common virtual address space 35 * defined by AS=0. 36 * 37 * Virtual address space layout: 38 * ----------------------------- 39 * 0x0000_0000 - 0xafff_ffff : user process 40 * 0xb000_0000 - 0xbfff_ffff : pmap_mapdev()-ed area (PCI/PCIE etc.) 41 * 0xc000_0000 - 0xc0ff_ffff : kernel reserved 42 * 0xc000_0000 - data_end : kernel code+data, env, metadata etc. 43 * 0xc100_0000 - 0xfeef_ffff : KVA 44 * 0xc100_0000 - 0xc100_3fff : reserved for page zero/copy 45 * 0xc100_4000 - 0xc200_3fff : reserved for ptbl bufs 46 * 0xc200_4000 - 0xc200_8fff : guard page + kstack0 47 * 0xc200_9000 - 0xfeef_ffff : actual free KVA space 48 * 0xfef0_0000 - 0xffff_ffff : I/O devices region 49 */ 50 51#include <sys/cdefs.h> 52__FBSDID("$FreeBSD: stable/10/sys/powerpc/booke/pmap.c 270439 2014-08-24 07:53:15Z kib $"); 53 54#include <sys/param.h> 55#include <sys/malloc.h> 56#include <sys/ktr.h> 57#include <sys/proc.h> 58#include <sys/user.h> 59#include <sys/queue.h> 60#include <sys/systm.h> 61#include <sys/kernel.h> 62#include <sys/linker.h> 63#include <sys/msgbuf.h> 64#include <sys/lock.h> 65#include <sys/mutex.h> 66#include <sys/rwlock.h> 67#include <sys/sched.h> 68#include <sys/smp.h> 69#include <sys/vmmeter.h> 70 71#include <vm/vm.h> 72#include <vm/vm_page.h> 73#include <vm/vm_kern.h> 74#include <vm/vm_pageout.h> 75#include <vm/vm_extern.h> 76#include <vm/vm_object.h> 77#include <vm/vm_param.h> 78#include <vm/vm_map.h> 79#include <vm/vm_pager.h> 80#include <vm/uma.h> 81 82#include <machine/cpu.h> 83#include <machine/pcb.h> 84#include <machine/platform.h> 85 86#include <machine/tlb.h> 87#include <machine/spr.h> 88#include <machine/md_var.h> 89#include <machine/mmuvar.h> 90#include <machine/pmap.h> 91#include <machine/pte.h> 92 93#include "mmu_if.h" 94 95#ifdef DEBUG 96#define debugf(fmt, args...) printf(fmt, ##args) 97#else 98#define debugf(fmt, args...) 99#endif 100 101#define TODO panic("%s: not implemented", __func__); 102 103extern int dumpsys_minidump; 104 105extern unsigned char _etext[]; 106extern unsigned char _end[]; 107 108extern uint32_t *bootinfo; 109 110#ifdef SMP 111extern uint32_t bp_ntlb1s; 112#endif 113 114vm_paddr_t kernload; 115vm_offset_t kernstart; 116vm_size_t kernsize; 117 118/* Message buffer and tables. */ 119static vm_offset_t data_start; 120static vm_size_t data_end; 121 122/* Phys/avail memory regions. */ 123static struct mem_region *availmem_regions; 124static int availmem_regions_sz; 125static struct mem_region *physmem_regions; 126static int physmem_regions_sz; 127 128/* Reserved KVA space and mutex for mmu_booke_zero_page. */ 129static vm_offset_t zero_page_va; 130static struct mtx zero_page_mutex; 131 132static struct mtx tlbivax_mutex; 133 134/* 135 * Reserved KVA space for mmu_booke_zero_page_idle. This is used 136 * by idle thred only, no lock required. 137 */ 138static vm_offset_t zero_page_idle_va; 139 140/* Reserved KVA space and mutex for mmu_booke_copy_page. */ 141static vm_offset_t copy_page_src_va; 142static vm_offset_t copy_page_dst_va; 143static struct mtx copy_page_mutex; 144 145/**************************************************************************/ 146/* PMAP */ 147/**************************************************************************/ 148 149static int mmu_booke_enter_locked(mmu_t, pmap_t, vm_offset_t, vm_page_t, 150 vm_prot_t, u_int flags, int8_t psind); 151 152unsigned int kptbl_min; /* Index of the first kernel ptbl. */ 153unsigned int kernel_ptbls; /* Number of KVA ptbls. */ 154 155/* 156 * If user pmap is processed with mmu_booke_remove and the resident count 157 * drops to 0, there are no more pages to remove, so we need not continue. 158 */ 159#define PMAP_REMOVE_DONE(pmap) \ 160 ((pmap) != kernel_pmap && (pmap)->pm_stats.resident_count == 0) 161 162extern void tid_flush(tlbtid_t); 163 164/**************************************************************************/ 165/* TLB and TID handling */ 166/**************************************************************************/ 167 168/* Translation ID busy table */ 169static volatile pmap_t tidbusy[MAXCPU][TID_MAX + 1]; 170 171/* 172 * TLB0 capabilities (entry, way numbers etc.). These can vary between e500 173 * core revisions and should be read from h/w registers during early config. 174 */ 175uint32_t tlb0_entries; 176uint32_t tlb0_ways; 177uint32_t tlb0_entries_per_way; 178 179#define TLB0_ENTRIES (tlb0_entries) 180#define TLB0_WAYS (tlb0_ways) 181#define TLB0_ENTRIES_PER_WAY (tlb0_entries_per_way) 182 183#define TLB1_ENTRIES 16 184 185/* In-ram copy of the TLB1 */ 186static tlb_entry_t tlb1[TLB1_ENTRIES]; 187 188/* Next free entry in the TLB1 */ 189static unsigned int tlb1_idx; 190static vm_offset_t tlb1_map_base = VM_MAX_KERNEL_ADDRESS; 191 192static tlbtid_t tid_alloc(struct pmap *); 193 194static void tlb_print_entry(int, uint32_t, uint32_t, uint32_t, uint32_t); 195 196static int tlb1_set_entry(vm_offset_t, vm_offset_t, vm_size_t, uint32_t); 197static void tlb1_write_entry(unsigned int); 198static int tlb1_iomapped(int, vm_paddr_t, vm_size_t, vm_offset_t *); 199static vm_size_t tlb1_mapin_region(vm_offset_t, vm_paddr_t, vm_size_t); 200 201static vm_size_t tsize2size(unsigned int); 202static unsigned int size2tsize(vm_size_t); 203static unsigned int ilog2(unsigned int); 204 205static void set_mas4_defaults(void); 206 207static inline void tlb0_flush_entry(vm_offset_t); 208static inline unsigned int tlb0_tableidx(vm_offset_t, unsigned int); 209 210/**************************************************************************/ 211/* Page table management */ 212/**************************************************************************/ 213 214static struct rwlock_padalign pvh_global_lock; 215 216/* Data for the pv entry allocation mechanism */ 217static uma_zone_t pvzone; 218static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0; 219 220#define PV_ENTRY_ZONE_MIN 2048 /* min pv entries in uma zone */ 221 222#ifndef PMAP_SHPGPERPROC 223#define PMAP_SHPGPERPROC 200 224#endif 225 226static void ptbl_init(void); 227static struct ptbl_buf *ptbl_buf_alloc(void); 228static void ptbl_buf_free(struct ptbl_buf *); 229static void ptbl_free_pmap_ptbl(pmap_t, pte_t *); 230 231static pte_t *ptbl_alloc(mmu_t, pmap_t, unsigned int, boolean_t); 232static void ptbl_free(mmu_t, pmap_t, unsigned int); 233static void ptbl_hold(mmu_t, pmap_t, unsigned int); 234static int ptbl_unhold(mmu_t, pmap_t, unsigned int); 235 236static vm_paddr_t pte_vatopa(mmu_t, pmap_t, vm_offset_t); 237static pte_t *pte_find(mmu_t, pmap_t, vm_offset_t); 238static int pte_enter(mmu_t, pmap_t, vm_page_t, vm_offset_t, uint32_t, boolean_t); 239static int pte_remove(mmu_t, pmap_t, vm_offset_t, uint8_t); 240 241static pv_entry_t pv_alloc(void); 242static void pv_free(pv_entry_t); 243static void pv_insert(pmap_t, vm_offset_t, vm_page_t); 244static void pv_remove(pmap_t, vm_offset_t, vm_page_t); 245 246/* Number of kva ptbl buffers, each covering one ptbl (PTBL_PAGES). */ 247#define PTBL_BUFS (128 * 16) 248 249struct ptbl_buf { 250 TAILQ_ENTRY(ptbl_buf) link; /* list link */ 251 vm_offset_t kva; /* va of mapping */ 252}; 253 254/* ptbl free list and a lock used for access synchronization. */ 255static TAILQ_HEAD(, ptbl_buf) ptbl_buf_freelist; 256static struct mtx ptbl_buf_freelist_lock; 257 258/* Base address of kva space allocated fot ptbl bufs. */ 259static vm_offset_t ptbl_buf_pool_vabase; 260 261/* Pointer to ptbl_buf structures. */ 262static struct ptbl_buf *ptbl_bufs; 263 264void pmap_bootstrap_ap(volatile uint32_t *); 265 266/* 267 * Kernel MMU interface 268 */ 269static void mmu_booke_change_wiring(mmu_t, pmap_t, vm_offset_t, boolean_t); 270static void mmu_booke_clear_modify(mmu_t, vm_page_t); 271static void mmu_booke_copy(mmu_t, pmap_t, pmap_t, vm_offset_t, 272 vm_size_t, vm_offset_t); 273static void mmu_booke_copy_page(mmu_t, vm_page_t, vm_page_t); 274static void mmu_booke_copy_pages(mmu_t, vm_page_t *, 275 vm_offset_t, vm_page_t *, vm_offset_t, int); 276static int mmu_booke_enter(mmu_t, pmap_t, vm_offset_t, vm_page_t, 277 vm_prot_t, u_int flags, int8_t psind); 278static void mmu_booke_enter_object(mmu_t, pmap_t, vm_offset_t, vm_offset_t, 279 vm_page_t, vm_prot_t); 280static void mmu_booke_enter_quick(mmu_t, pmap_t, vm_offset_t, vm_page_t, 281 vm_prot_t); 282static vm_paddr_t mmu_booke_extract(mmu_t, pmap_t, vm_offset_t); 283static vm_page_t mmu_booke_extract_and_hold(mmu_t, pmap_t, vm_offset_t, 284 vm_prot_t); 285static void mmu_booke_init(mmu_t); 286static boolean_t mmu_booke_is_modified(mmu_t, vm_page_t); 287static boolean_t mmu_booke_is_prefaultable(mmu_t, pmap_t, vm_offset_t); 288static boolean_t mmu_booke_is_referenced(mmu_t, vm_page_t); 289static int mmu_booke_ts_referenced(mmu_t, vm_page_t); 290static vm_offset_t mmu_booke_map(mmu_t, vm_offset_t *, vm_paddr_t, vm_paddr_t, 291 int); 292static int mmu_booke_mincore(mmu_t, pmap_t, vm_offset_t, 293 vm_paddr_t *); 294static void mmu_booke_object_init_pt(mmu_t, pmap_t, vm_offset_t, 295 vm_object_t, vm_pindex_t, vm_size_t); 296static boolean_t mmu_booke_page_exists_quick(mmu_t, pmap_t, vm_page_t); 297static void mmu_booke_page_init(mmu_t, vm_page_t); 298static int mmu_booke_page_wired_mappings(mmu_t, vm_page_t); 299static void mmu_booke_pinit(mmu_t, pmap_t); 300static void mmu_booke_pinit0(mmu_t, pmap_t); 301static void mmu_booke_protect(mmu_t, pmap_t, vm_offset_t, vm_offset_t, 302 vm_prot_t); 303static void mmu_booke_qenter(mmu_t, vm_offset_t, vm_page_t *, int); 304static void mmu_booke_qremove(mmu_t, vm_offset_t, int); 305static void mmu_booke_release(mmu_t, pmap_t); 306static void mmu_booke_remove(mmu_t, pmap_t, vm_offset_t, vm_offset_t); 307static void mmu_booke_remove_all(mmu_t, vm_page_t); 308static void mmu_booke_remove_write(mmu_t, vm_page_t); 309static void mmu_booke_zero_page(mmu_t, vm_page_t); 310static void mmu_booke_zero_page_area(mmu_t, vm_page_t, int, int); 311static void mmu_booke_zero_page_idle(mmu_t, vm_page_t); 312static void mmu_booke_activate(mmu_t, struct thread *); 313static void mmu_booke_deactivate(mmu_t, struct thread *); 314static void mmu_booke_bootstrap(mmu_t, vm_offset_t, vm_offset_t); 315static void *mmu_booke_mapdev(mmu_t, vm_paddr_t, vm_size_t); 316static void *mmu_booke_mapdev_attr(mmu_t, vm_paddr_t, vm_size_t, vm_memattr_t); 317static void mmu_booke_unmapdev(mmu_t, vm_offset_t, vm_size_t); 318static vm_paddr_t mmu_booke_kextract(mmu_t, vm_offset_t); 319static void mmu_booke_kenter(mmu_t, vm_offset_t, vm_paddr_t); 320static void mmu_booke_kenter_attr(mmu_t, vm_offset_t, vm_paddr_t, vm_memattr_t); 321static void mmu_booke_kremove(mmu_t, vm_offset_t); 322static boolean_t mmu_booke_dev_direct_mapped(mmu_t, vm_paddr_t, vm_size_t); 323static void mmu_booke_sync_icache(mmu_t, pmap_t, vm_offset_t, 324 vm_size_t); 325static vm_offset_t mmu_booke_dumpsys_map(mmu_t, struct pmap_md *, 326 vm_size_t, vm_size_t *); 327static void mmu_booke_dumpsys_unmap(mmu_t, struct pmap_md *, 328 vm_size_t, vm_offset_t); 329static struct pmap_md *mmu_booke_scan_md(mmu_t, struct pmap_md *); 330 331static mmu_method_t mmu_booke_methods[] = { 332 /* pmap dispatcher interface */ 333 MMUMETHOD(mmu_change_wiring, mmu_booke_change_wiring), 334 MMUMETHOD(mmu_clear_modify, mmu_booke_clear_modify), 335 MMUMETHOD(mmu_copy, mmu_booke_copy), 336 MMUMETHOD(mmu_copy_page, mmu_booke_copy_page), 337 MMUMETHOD(mmu_copy_pages, mmu_booke_copy_pages), 338 MMUMETHOD(mmu_enter, mmu_booke_enter), 339 MMUMETHOD(mmu_enter_object, mmu_booke_enter_object), 340 MMUMETHOD(mmu_enter_quick, mmu_booke_enter_quick), 341 MMUMETHOD(mmu_extract, mmu_booke_extract), 342 MMUMETHOD(mmu_extract_and_hold, mmu_booke_extract_and_hold), 343 MMUMETHOD(mmu_init, mmu_booke_init), 344 MMUMETHOD(mmu_is_modified, mmu_booke_is_modified), 345 MMUMETHOD(mmu_is_prefaultable, mmu_booke_is_prefaultable), 346 MMUMETHOD(mmu_is_referenced, mmu_booke_is_referenced), 347 MMUMETHOD(mmu_ts_referenced, mmu_booke_ts_referenced), 348 MMUMETHOD(mmu_map, mmu_booke_map), 349 MMUMETHOD(mmu_mincore, mmu_booke_mincore), 350 MMUMETHOD(mmu_object_init_pt, mmu_booke_object_init_pt), 351 MMUMETHOD(mmu_page_exists_quick,mmu_booke_page_exists_quick), 352 MMUMETHOD(mmu_page_init, mmu_booke_page_init), 353 MMUMETHOD(mmu_page_wired_mappings, mmu_booke_page_wired_mappings), 354 MMUMETHOD(mmu_pinit, mmu_booke_pinit), 355 MMUMETHOD(mmu_pinit0, mmu_booke_pinit0), 356 MMUMETHOD(mmu_protect, mmu_booke_protect), 357 MMUMETHOD(mmu_qenter, mmu_booke_qenter), 358 MMUMETHOD(mmu_qremove, mmu_booke_qremove), 359 MMUMETHOD(mmu_release, mmu_booke_release), 360 MMUMETHOD(mmu_remove, mmu_booke_remove), 361 MMUMETHOD(mmu_remove_all, mmu_booke_remove_all), 362 MMUMETHOD(mmu_remove_write, mmu_booke_remove_write), 363 MMUMETHOD(mmu_sync_icache, mmu_booke_sync_icache), 364 MMUMETHOD(mmu_zero_page, mmu_booke_zero_page), 365 MMUMETHOD(mmu_zero_page_area, mmu_booke_zero_page_area), 366 MMUMETHOD(mmu_zero_page_idle, mmu_booke_zero_page_idle), 367 MMUMETHOD(mmu_activate, mmu_booke_activate), 368 MMUMETHOD(mmu_deactivate, mmu_booke_deactivate), 369 370 /* Internal interfaces */ 371 MMUMETHOD(mmu_bootstrap, mmu_booke_bootstrap), 372 MMUMETHOD(mmu_dev_direct_mapped,mmu_booke_dev_direct_mapped), 373 MMUMETHOD(mmu_mapdev, mmu_booke_mapdev), 374 MMUMETHOD(mmu_mapdev_attr, mmu_booke_mapdev_attr), 375 MMUMETHOD(mmu_kenter, mmu_booke_kenter), 376 MMUMETHOD(mmu_kenter_attr, mmu_booke_kenter_attr), 377 MMUMETHOD(mmu_kextract, mmu_booke_kextract), 378/* MMUMETHOD(mmu_kremove, mmu_booke_kremove), */ 379 MMUMETHOD(mmu_unmapdev, mmu_booke_unmapdev), 380 381 /* dumpsys() support */ 382 MMUMETHOD(mmu_dumpsys_map, mmu_booke_dumpsys_map), 383 MMUMETHOD(mmu_dumpsys_unmap, mmu_booke_dumpsys_unmap), 384 MMUMETHOD(mmu_scan_md, mmu_booke_scan_md), 385 386 { 0, 0 } 387}; 388 389MMU_DEF(booke_mmu, MMU_TYPE_BOOKE, mmu_booke_methods, 0); 390 391static __inline uint32_t 392tlb_calc_wimg(vm_offset_t pa, vm_memattr_t ma) 393{ 394 uint32_t attrib; 395 int i; 396 397 if (ma != VM_MEMATTR_DEFAULT) { 398 switch (ma) { 399 case VM_MEMATTR_UNCACHEABLE: 400 return (PTE_I | PTE_G); 401 case VM_MEMATTR_WRITE_COMBINING: 402 case VM_MEMATTR_WRITE_BACK: 403 case VM_MEMATTR_PREFETCHABLE: 404 return (PTE_I); 405 case VM_MEMATTR_WRITE_THROUGH: 406 return (PTE_W | PTE_M); 407 } 408 } 409 410 /* 411 * Assume the page is cache inhibited and access is guarded unless 412 * it's in our available memory array. 413 */ 414 attrib = _TLB_ENTRY_IO; 415 for (i = 0; i < physmem_regions_sz; i++) { 416 if ((pa >= physmem_regions[i].mr_start) && 417 (pa < (physmem_regions[i].mr_start + 418 physmem_regions[i].mr_size))) { 419 attrib = _TLB_ENTRY_MEM; 420 break; 421 } 422 } 423 424 return (attrib); 425} 426 427static inline void 428tlb_miss_lock(void) 429{ 430#ifdef SMP 431 struct pcpu *pc; 432 433 if (!smp_started) 434 return; 435 436 STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) { 437 if (pc != pcpup) { 438 439 CTR3(KTR_PMAP, "%s: tlb miss LOCK of CPU=%d, " 440 "tlb_lock=%p", __func__, pc->pc_cpuid, pc->pc_booke_tlb_lock); 441 442 KASSERT((pc->pc_cpuid != PCPU_GET(cpuid)), 443 ("tlb_miss_lock: tried to lock self")); 444 445 tlb_lock(pc->pc_booke_tlb_lock); 446 447 CTR1(KTR_PMAP, "%s: locked", __func__); 448 } 449 } 450#endif 451} 452 453static inline void 454tlb_miss_unlock(void) 455{ 456#ifdef SMP 457 struct pcpu *pc; 458 459 if (!smp_started) 460 return; 461 462 STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) { 463 if (pc != pcpup) { 464 CTR2(KTR_PMAP, "%s: tlb miss UNLOCK of CPU=%d", 465 __func__, pc->pc_cpuid); 466 467 tlb_unlock(pc->pc_booke_tlb_lock); 468 469 CTR1(KTR_PMAP, "%s: unlocked", __func__); 470 } 471 } 472#endif 473} 474 475/* Return number of entries in TLB0. */ 476static __inline void 477tlb0_get_tlbconf(void) 478{ 479 uint32_t tlb0_cfg; 480 481 tlb0_cfg = mfspr(SPR_TLB0CFG); 482 tlb0_entries = tlb0_cfg & TLBCFG_NENTRY_MASK; 483 tlb0_ways = (tlb0_cfg & TLBCFG_ASSOC_MASK) >> TLBCFG_ASSOC_SHIFT; 484 tlb0_entries_per_way = tlb0_entries / tlb0_ways; 485} 486 487/* Initialize pool of kva ptbl buffers. */ 488static void 489ptbl_init(void) 490{ 491 int i; 492 493 CTR3(KTR_PMAP, "%s: s (ptbl_bufs = 0x%08x size 0x%08x)", __func__, 494 (uint32_t)ptbl_bufs, sizeof(struct ptbl_buf) * PTBL_BUFS); 495 CTR3(KTR_PMAP, "%s: s (ptbl_buf_pool_vabase = 0x%08x size = 0x%08x)", 496 __func__, ptbl_buf_pool_vabase, PTBL_BUFS * PTBL_PAGES * PAGE_SIZE); 497 498 mtx_init(&ptbl_buf_freelist_lock, "ptbl bufs lock", NULL, MTX_DEF); 499 TAILQ_INIT(&ptbl_buf_freelist); 500 501 for (i = 0; i < PTBL_BUFS; i++) { 502 ptbl_bufs[i].kva = ptbl_buf_pool_vabase + i * PTBL_PAGES * PAGE_SIZE; 503 TAILQ_INSERT_TAIL(&ptbl_buf_freelist, &ptbl_bufs[i], link); 504 } 505} 506 507/* Get a ptbl_buf from the freelist. */ 508static struct ptbl_buf * 509ptbl_buf_alloc(void) 510{ 511 struct ptbl_buf *buf; 512 513 mtx_lock(&ptbl_buf_freelist_lock); 514 buf = TAILQ_FIRST(&ptbl_buf_freelist); 515 if (buf != NULL) 516 TAILQ_REMOVE(&ptbl_buf_freelist, buf, link); 517 mtx_unlock(&ptbl_buf_freelist_lock); 518 519 CTR2(KTR_PMAP, "%s: buf = %p", __func__, buf); 520 521 return (buf); 522} 523 524/* Return ptbl buff to free pool. */ 525static void 526ptbl_buf_free(struct ptbl_buf *buf) 527{ 528 529 CTR2(KTR_PMAP, "%s: buf = %p", __func__, buf); 530 531 mtx_lock(&ptbl_buf_freelist_lock); 532 TAILQ_INSERT_TAIL(&ptbl_buf_freelist, buf, link); 533 mtx_unlock(&ptbl_buf_freelist_lock); 534} 535 536/* 537 * Search the list of allocated ptbl bufs and find on list of allocated ptbls 538 */ 539static void 540ptbl_free_pmap_ptbl(pmap_t pmap, pte_t *ptbl) 541{ 542 struct ptbl_buf *pbuf; 543 544 CTR2(KTR_PMAP, "%s: ptbl = %p", __func__, ptbl); 545 546 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 547 548 TAILQ_FOREACH(pbuf, &pmap->pm_ptbl_list, link) 549 if (pbuf->kva == (vm_offset_t)ptbl) { 550 /* Remove from pmap ptbl buf list. */ 551 TAILQ_REMOVE(&pmap->pm_ptbl_list, pbuf, link); 552 553 /* Free corresponding ptbl buf. */ 554 ptbl_buf_free(pbuf); 555 break; 556 } 557} 558 559/* Allocate page table. */ 560static pte_t * 561ptbl_alloc(mmu_t mmu, pmap_t pmap, unsigned int pdir_idx, boolean_t nosleep) 562{ 563 vm_page_t mtbl[PTBL_PAGES]; 564 vm_page_t m; 565 struct ptbl_buf *pbuf; 566 unsigned int pidx; 567 pte_t *ptbl; 568 int i, j; 569 570 CTR4(KTR_PMAP, "%s: pmap = %p su = %d pdir_idx = %d", __func__, pmap, 571 (pmap == kernel_pmap), pdir_idx); 572 573 KASSERT((pdir_idx <= (VM_MAXUSER_ADDRESS / PDIR_SIZE)), 574 ("ptbl_alloc: invalid pdir_idx")); 575 KASSERT((pmap->pm_pdir[pdir_idx] == NULL), 576 ("pte_alloc: valid ptbl entry exists!")); 577 578 pbuf = ptbl_buf_alloc(); 579 if (pbuf == NULL) 580 panic("pte_alloc: couldn't alloc kernel virtual memory"); 581 582 ptbl = (pte_t *)pbuf->kva; 583 584 CTR2(KTR_PMAP, "%s: ptbl kva = %p", __func__, ptbl); 585 586 /* Allocate ptbl pages, this will sleep! */ 587 for (i = 0; i < PTBL_PAGES; i++) { 588 pidx = (PTBL_PAGES * pdir_idx) + i; 589 while ((m = vm_page_alloc(NULL, pidx, 590 VM_ALLOC_NOOBJ | VM_ALLOC_WIRED)) == NULL) { 591 PMAP_UNLOCK(pmap); 592 rw_wunlock(&pvh_global_lock); 593 if (nosleep) { 594 ptbl_free_pmap_ptbl(pmap, ptbl); 595 for (j = 0; j < i; j++) 596 vm_page_free(mtbl[j]); 597 atomic_subtract_int(&cnt.v_wire_count, i); 598 return (NULL); 599 } 600 VM_WAIT; 601 rw_wlock(&pvh_global_lock); 602 PMAP_LOCK(pmap); 603 } 604 mtbl[i] = m; 605 } 606 607 /* Map allocated pages into kernel_pmap. */ 608 mmu_booke_qenter(mmu, (vm_offset_t)ptbl, mtbl, PTBL_PAGES); 609 610 /* Zero whole ptbl. */ 611 bzero((caddr_t)ptbl, PTBL_PAGES * PAGE_SIZE); 612 613 /* Add pbuf to the pmap ptbl bufs list. */ 614 TAILQ_INSERT_TAIL(&pmap->pm_ptbl_list, pbuf, link); 615 616 return (ptbl); 617} 618 619/* Free ptbl pages and invalidate pdir entry. */ 620static void 621ptbl_free(mmu_t mmu, pmap_t pmap, unsigned int pdir_idx) 622{ 623 pte_t *ptbl; 624 vm_paddr_t pa; 625 vm_offset_t va; 626 vm_page_t m; 627 int i; 628 629 CTR4(KTR_PMAP, "%s: pmap = %p su = %d pdir_idx = %d", __func__, pmap, 630 (pmap == kernel_pmap), pdir_idx); 631 632 KASSERT((pdir_idx <= (VM_MAXUSER_ADDRESS / PDIR_SIZE)), 633 ("ptbl_free: invalid pdir_idx")); 634 635 ptbl = pmap->pm_pdir[pdir_idx]; 636 637 CTR2(KTR_PMAP, "%s: ptbl = %p", __func__, ptbl); 638 639 KASSERT((ptbl != NULL), ("ptbl_free: null ptbl")); 640 641 /* 642 * Invalidate the pdir entry as soon as possible, so that other CPUs 643 * don't attempt to look up the page tables we are releasing. 644 */ 645 mtx_lock_spin(&tlbivax_mutex); 646 tlb_miss_lock(); 647 648 pmap->pm_pdir[pdir_idx] = NULL; 649 650 tlb_miss_unlock(); 651 mtx_unlock_spin(&tlbivax_mutex); 652 653 for (i = 0; i < PTBL_PAGES; i++) { 654 va = ((vm_offset_t)ptbl + (i * PAGE_SIZE)); 655 pa = pte_vatopa(mmu, kernel_pmap, va); 656 m = PHYS_TO_VM_PAGE(pa); 657 vm_page_free_zero(m); 658 atomic_subtract_int(&cnt.v_wire_count, 1); 659 mmu_booke_kremove(mmu, va); 660 } 661 662 ptbl_free_pmap_ptbl(pmap, ptbl); 663} 664 665/* 666 * Decrement ptbl pages hold count and attempt to free ptbl pages. 667 * Called when removing pte entry from ptbl. 668 * 669 * Return 1 if ptbl pages were freed. 670 */ 671static int 672ptbl_unhold(mmu_t mmu, pmap_t pmap, unsigned int pdir_idx) 673{ 674 pte_t *ptbl; 675 vm_paddr_t pa; 676 vm_page_t m; 677 int i; 678 679 CTR4(KTR_PMAP, "%s: pmap = %p su = %d pdir_idx = %d", __func__, pmap, 680 (pmap == kernel_pmap), pdir_idx); 681 682 KASSERT((pdir_idx <= (VM_MAXUSER_ADDRESS / PDIR_SIZE)), 683 ("ptbl_unhold: invalid pdir_idx")); 684 KASSERT((pmap != kernel_pmap), 685 ("ptbl_unhold: unholding kernel ptbl!")); 686 687 ptbl = pmap->pm_pdir[pdir_idx]; 688 689 //debugf("ptbl_unhold: ptbl = 0x%08x\n", (u_int32_t)ptbl); 690 KASSERT(((vm_offset_t)ptbl >= VM_MIN_KERNEL_ADDRESS), 691 ("ptbl_unhold: non kva ptbl")); 692 693 /* decrement hold count */ 694 for (i = 0; i < PTBL_PAGES; i++) { 695 pa = pte_vatopa(mmu, kernel_pmap, 696 (vm_offset_t)ptbl + (i * PAGE_SIZE)); 697 m = PHYS_TO_VM_PAGE(pa); 698 m->wire_count--; 699 } 700 701 /* 702 * Free ptbl pages if there are no pte etries in this ptbl. 703 * wire_count has the same value for all ptbl pages, so check the last 704 * page. 705 */ 706 if (m->wire_count == 0) { 707 ptbl_free(mmu, pmap, pdir_idx); 708 709 //debugf("ptbl_unhold: e (freed ptbl)\n"); 710 return (1); 711 } 712 713 return (0); 714} 715 716/* 717 * Increment hold count for ptbl pages. This routine is used when a new pte 718 * entry is being inserted into the ptbl. 719 */ 720static void 721ptbl_hold(mmu_t mmu, pmap_t pmap, unsigned int pdir_idx) 722{ 723 vm_paddr_t pa; 724 pte_t *ptbl; 725 vm_page_t m; 726 int i; 727 728 CTR3(KTR_PMAP, "%s: pmap = %p pdir_idx = %d", __func__, pmap, 729 pdir_idx); 730 731 KASSERT((pdir_idx <= (VM_MAXUSER_ADDRESS / PDIR_SIZE)), 732 ("ptbl_hold: invalid pdir_idx")); 733 KASSERT((pmap != kernel_pmap), 734 ("ptbl_hold: holding kernel ptbl!")); 735 736 ptbl = pmap->pm_pdir[pdir_idx]; 737 738 KASSERT((ptbl != NULL), ("ptbl_hold: null ptbl")); 739 740 for (i = 0; i < PTBL_PAGES; i++) { 741 pa = pte_vatopa(mmu, kernel_pmap, 742 (vm_offset_t)ptbl + (i * PAGE_SIZE)); 743 m = PHYS_TO_VM_PAGE(pa); 744 m->wire_count++; 745 } 746} 747 748/* Allocate pv_entry structure. */ 749pv_entry_t 750pv_alloc(void) 751{ 752 pv_entry_t pv; 753 754 pv_entry_count++; 755 if (pv_entry_count > pv_entry_high_water) 756 pagedaemon_wakeup(); 757 pv = uma_zalloc(pvzone, M_NOWAIT); 758 759 return (pv); 760} 761 762/* Free pv_entry structure. */ 763static __inline void 764pv_free(pv_entry_t pve) 765{ 766 767 pv_entry_count--; 768 uma_zfree(pvzone, pve); 769} 770 771 772/* Allocate and initialize pv_entry structure. */ 773static void 774pv_insert(pmap_t pmap, vm_offset_t va, vm_page_t m) 775{ 776 pv_entry_t pve; 777 778 //int su = (pmap == kernel_pmap); 779 //debugf("pv_insert: s (su = %d pmap = 0x%08x va = 0x%08x m = 0x%08x)\n", su, 780 // (u_int32_t)pmap, va, (u_int32_t)m); 781 782 pve = pv_alloc(); 783 if (pve == NULL) 784 panic("pv_insert: no pv entries!"); 785 786 pve->pv_pmap = pmap; 787 pve->pv_va = va; 788 789 /* add to pv_list */ 790 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 791 rw_assert(&pvh_global_lock, RA_WLOCKED); 792 793 TAILQ_INSERT_TAIL(&m->md.pv_list, pve, pv_link); 794 795 //debugf("pv_insert: e\n"); 796} 797 798/* Destroy pv entry. */ 799static void 800pv_remove(pmap_t pmap, vm_offset_t va, vm_page_t m) 801{ 802 pv_entry_t pve; 803 804 //int su = (pmap == kernel_pmap); 805 //debugf("pv_remove: s (su = %d pmap = 0x%08x va = 0x%08x)\n", su, (u_int32_t)pmap, va); 806 807 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 808 rw_assert(&pvh_global_lock, RA_WLOCKED); 809 810 /* find pv entry */ 811 TAILQ_FOREACH(pve, &m->md.pv_list, pv_link) { 812 if ((pmap == pve->pv_pmap) && (va == pve->pv_va)) { 813 /* remove from pv_list */ 814 TAILQ_REMOVE(&m->md.pv_list, pve, pv_link); 815 if (TAILQ_EMPTY(&m->md.pv_list)) 816 vm_page_aflag_clear(m, PGA_WRITEABLE); 817 818 /* free pv entry struct */ 819 pv_free(pve); 820 break; 821 } 822 } 823 824 //debugf("pv_remove: e\n"); 825} 826 827/* 828 * Clean pte entry, try to free page table page if requested. 829 * 830 * Return 1 if ptbl pages were freed, otherwise return 0. 831 */ 832static int 833pte_remove(mmu_t mmu, pmap_t pmap, vm_offset_t va, uint8_t flags) 834{ 835 unsigned int pdir_idx = PDIR_IDX(va); 836 unsigned int ptbl_idx = PTBL_IDX(va); 837 vm_page_t m; 838 pte_t *ptbl; 839 pte_t *pte; 840 841 //int su = (pmap == kernel_pmap); 842 //debugf("pte_remove: s (su = %d pmap = 0x%08x va = 0x%08x flags = %d)\n", 843 // su, (u_int32_t)pmap, va, flags); 844 845 ptbl = pmap->pm_pdir[pdir_idx]; 846 KASSERT(ptbl, ("pte_remove: null ptbl")); 847 848 pte = &ptbl[ptbl_idx]; 849 850 if (pte == NULL || !PTE_ISVALID(pte)) 851 return (0); 852 853 if (PTE_ISWIRED(pte)) 854 pmap->pm_stats.wired_count--; 855 856 /* Handle managed entry. */ 857 if (PTE_ISMANAGED(pte)) { 858 /* Get vm_page_t for mapped pte. */ 859 m = PHYS_TO_VM_PAGE(PTE_PA(pte)); 860 861 if (PTE_ISMODIFIED(pte)) 862 vm_page_dirty(m); 863 864 if (PTE_ISREFERENCED(pte)) 865 vm_page_aflag_set(m, PGA_REFERENCED); 866 867 pv_remove(pmap, va, m); 868 } 869 870 mtx_lock_spin(&tlbivax_mutex); 871 tlb_miss_lock(); 872 873 tlb0_flush_entry(va); 874 pte->flags = 0; 875 pte->rpn = 0; 876 877 tlb_miss_unlock(); 878 mtx_unlock_spin(&tlbivax_mutex); 879 880 pmap->pm_stats.resident_count--; 881 882 if (flags & PTBL_UNHOLD) { 883 //debugf("pte_remove: e (unhold)\n"); 884 return (ptbl_unhold(mmu, pmap, pdir_idx)); 885 } 886 887 //debugf("pte_remove: e\n"); 888 return (0); 889} 890 891/* 892 * Insert PTE for a given page and virtual address. 893 */ 894static int 895pte_enter(mmu_t mmu, pmap_t pmap, vm_page_t m, vm_offset_t va, uint32_t flags, 896 boolean_t nosleep) 897{ 898 unsigned int pdir_idx = PDIR_IDX(va); 899 unsigned int ptbl_idx = PTBL_IDX(va); 900 pte_t *ptbl, *pte; 901 902 CTR4(KTR_PMAP, "%s: su = %d pmap = %p va = %p", __func__, 903 pmap == kernel_pmap, pmap, va); 904 905 /* Get the page table pointer. */ 906 ptbl = pmap->pm_pdir[pdir_idx]; 907 908 if (ptbl == NULL) { 909 /* Allocate page table pages. */ 910 ptbl = ptbl_alloc(mmu, pmap, pdir_idx, nosleep); 911 if (ptbl == NULL) { 912 KASSERT(nosleep, ("nosleep and NULL ptbl")); 913 return (ENOMEM); 914 } 915 } else { 916 /* 917 * Check if there is valid mapping for requested 918 * va, if there is, remove it. 919 */ 920 pte = &pmap->pm_pdir[pdir_idx][ptbl_idx]; 921 if (PTE_ISVALID(pte)) { 922 pte_remove(mmu, pmap, va, PTBL_HOLD); 923 } else { 924 /* 925 * pte is not used, increment hold count 926 * for ptbl pages. 927 */ 928 if (pmap != kernel_pmap) 929 ptbl_hold(mmu, pmap, pdir_idx); 930 } 931 } 932 933 /* 934 * Insert pv_entry into pv_list for mapped page if part of managed 935 * memory. 936 */ 937 if ((m->oflags & VPO_UNMANAGED) == 0) { 938 flags |= PTE_MANAGED; 939 940 /* Create and insert pv entry. */ 941 pv_insert(pmap, va, m); 942 } 943 944 pmap->pm_stats.resident_count++; 945 946 mtx_lock_spin(&tlbivax_mutex); 947 tlb_miss_lock(); 948 949 tlb0_flush_entry(va); 950 if (pmap->pm_pdir[pdir_idx] == NULL) { 951 /* 952 * If we just allocated a new page table, hook it in 953 * the pdir. 954 */ 955 pmap->pm_pdir[pdir_idx] = ptbl; 956 } 957 pte = &(pmap->pm_pdir[pdir_idx][ptbl_idx]); 958 pte->rpn = VM_PAGE_TO_PHYS(m) & ~PTE_PA_MASK; 959 pte->flags |= (PTE_VALID | flags); 960 961 tlb_miss_unlock(); 962 mtx_unlock_spin(&tlbivax_mutex); 963 return (0); 964} 965 966/* Return the pa for the given pmap/va. */ 967static vm_paddr_t 968pte_vatopa(mmu_t mmu, pmap_t pmap, vm_offset_t va) 969{ 970 vm_paddr_t pa = 0; 971 pte_t *pte; 972 973 pte = pte_find(mmu, pmap, va); 974 if ((pte != NULL) && PTE_ISVALID(pte)) 975 pa = (PTE_PA(pte) | (va & PTE_PA_MASK)); 976 return (pa); 977} 978 979/* Get a pointer to a PTE in a page table. */ 980static pte_t * 981pte_find(mmu_t mmu, pmap_t pmap, vm_offset_t va) 982{ 983 unsigned int pdir_idx = PDIR_IDX(va); 984 unsigned int ptbl_idx = PTBL_IDX(va); 985 986 KASSERT((pmap != NULL), ("pte_find: invalid pmap")); 987 988 if (pmap->pm_pdir[pdir_idx]) 989 return (&(pmap->pm_pdir[pdir_idx][ptbl_idx])); 990 991 return (NULL); 992} 993 994/**************************************************************************/ 995/* PMAP related */ 996/**************************************************************************/ 997 998/* 999 * This is called during booke_init, before the system is really initialized. 1000 */ 1001static void 1002mmu_booke_bootstrap(mmu_t mmu, vm_offset_t start, vm_offset_t kernelend) 1003{ 1004 vm_offset_t phys_kernelend; 1005 struct mem_region *mp, *mp1; 1006 int cnt, i, j; 1007 u_int s, e, sz; 1008 u_int phys_avail_count; 1009 vm_size_t physsz, hwphyssz, kstack0_sz; 1010 vm_offset_t kernel_pdir, kstack0, va; 1011 vm_paddr_t kstack0_phys; 1012 void *dpcpu; 1013 pte_t *pte; 1014 1015 debugf("mmu_booke_bootstrap: entered\n"); 1016 1017 /* Initialize invalidation mutex */ 1018 mtx_init(&tlbivax_mutex, "tlbivax", NULL, MTX_SPIN); 1019 1020 /* Read TLB0 size and associativity. */ 1021 tlb0_get_tlbconf(); 1022 1023 /* 1024 * Align kernel start and end address (kernel image). 1025 * Note that kernel end does not necessarily relate to kernsize. 1026 * kernsize is the size of the kernel that is actually mapped. 1027 * Also note that "start - 1" is deliberate. With SMP, the 1028 * entry point is exactly a page from the actual load address. 1029 * As such, trunc_page() has no effect and we're off by a page. 1030 * Since we always have the ELF header between the load address 1031 * and the entry point, we can safely subtract 1 to compensate. 1032 */ 1033 kernstart = trunc_page(start - 1); 1034 data_start = round_page(kernelend); 1035 data_end = data_start; 1036 1037 /* 1038 * Addresses of preloaded modules (like file systems) use 1039 * physical addresses. Make sure we relocate those into 1040 * virtual addresses. 1041 */ 1042 preload_addr_relocate = kernstart - kernload; 1043 1044 /* Allocate the dynamic per-cpu area. */ 1045 dpcpu = (void *)data_end; 1046 data_end += DPCPU_SIZE; 1047 1048 /* Allocate space for the message buffer. */ 1049 msgbufp = (struct msgbuf *)data_end; 1050 data_end += msgbufsize; 1051 debugf(" msgbufp at 0x%08x end = 0x%08x\n", (uint32_t)msgbufp, 1052 data_end); 1053 1054 data_end = round_page(data_end); 1055 1056 /* Allocate space for ptbl_bufs. */ 1057 ptbl_bufs = (struct ptbl_buf *)data_end; 1058 data_end += sizeof(struct ptbl_buf) * PTBL_BUFS; 1059 debugf(" ptbl_bufs at 0x%08x end = 0x%08x\n", (uint32_t)ptbl_bufs, 1060 data_end); 1061 1062 data_end = round_page(data_end); 1063 1064 /* Allocate PTE tables for kernel KVA. */ 1065 kernel_pdir = data_end; 1066 kernel_ptbls = (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS + 1067 PDIR_SIZE - 1) / PDIR_SIZE; 1068 data_end += kernel_ptbls * PTBL_PAGES * PAGE_SIZE; 1069 debugf(" kernel ptbls: %d\n", kernel_ptbls); 1070 debugf(" kernel pdir at 0x%08x end = 0x%08x\n", kernel_pdir, data_end); 1071 1072 debugf(" data_end: 0x%08x\n", data_end); 1073 if (data_end - kernstart > kernsize) { 1074 kernsize += tlb1_mapin_region(kernstart + kernsize, 1075 kernload + kernsize, (data_end - kernstart) - kernsize); 1076 } 1077 data_end = kernstart + kernsize; 1078 debugf(" updated data_end: 0x%08x\n", data_end); 1079 1080 /* 1081 * Clear the structures - note we can only do it safely after the 1082 * possible additional TLB1 translations are in place (above) so that 1083 * all range up to the currently calculated 'data_end' is covered. 1084 */ 1085 dpcpu_init(dpcpu, 0); 1086 memset((void *)ptbl_bufs, 0, sizeof(struct ptbl_buf) * PTBL_SIZE); 1087 memset((void *)kernel_pdir, 0, kernel_ptbls * PTBL_PAGES * PAGE_SIZE); 1088 1089 /*******************************************************/ 1090 /* Set the start and end of kva. */ 1091 /*******************************************************/ 1092 virtual_avail = round_page(data_end); 1093 virtual_end = VM_MAX_KERNEL_ADDRESS; 1094 1095 /* Allocate KVA space for page zero/copy operations. */ 1096 zero_page_va = virtual_avail; 1097 virtual_avail += PAGE_SIZE; 1098 zero_page_idle_va = virtual_avail; 1099 virtual_avail += PAGE_SIZE; 1100 copy_page_src_va = virtual_avail; 1101 virtual_avail += PAGE_SIZE; 1102 copy_page_dst_va = virtual_avail; 1103 virtual_avail += PAGE_SIZE; 1104 debugf("zero_page_va = 0x%08x\n", zero_page_va); 1105 debugf("zero_page_idle_va = 0x%08x\n", zero_page_idle_va); 1106 debugf("copy_page_src_va = 0x%08x\n", copy_page_src_va); 1107 debugf("copy_page_dst_va = 0x%08x\n", copy_page_dst_va); 1108 1109 /* Initialize page zero/copy mutexes. */ 1110 mtx_init(&zero_page_mutex, "mmu_booke_zero_page", NULL, MTX_DEF); 1111 mtx_init(©_page_mutex, "mmu_booke_copy_page", NULL, MTX_DEF); 1112 1113 /* Allocate KVA space for ptbl bufs. */ 1114 ptbl_buf_pool_vabase = virtual_avail; 1115 virtual_avail += PTBL_BUFS * PTBL_PAGES * PAGE_SIZE; 1116 debugf("ptbl_buf_pool_vabase = 0x%08x end = 0x%08x\n", 1117 ptbl_buf_pool_vabase, virtual_avail); 1118 1119 /* Calculate corresponding physical addresses for the kernel region. */ 1120 phys_kernelend = kernload + kernsize; 1121 debugf("kernel image and allocated data:\n"); 1122 debugf(" kernload = 0x%08x\n", kernload); 1123 debugf(" kernstart = 0x%08x\n", kernstart); 1124 debugf(" kernsize = 0x%08x\n", kernsize); 1125 1126 if (sizeof(phys_avail) / sizeof(phys_avail[0]) < availmem_regions_sz) 1127 panic("mmu_booke_bootstrap: phys_avail too small"); 1128 1129 /* 1130 * Remove kernel physical address range from avail regions list. Page 1131 * align all regions. Non-page aligned memory isn't very interesting 1132 * to us. Also, sort the entries for ascending addresses. 1133 */ 1134 1135 /* Retrieve phys/avail mem regions */ 1136 mem_regions(&physmem_regions, &physmem_regions_sz, 1137 &availmem_regions, &availmem_regions_sz); 1138 sz = 0; 1139 cnt = availmem_regions_sz; 1140 debugf("processing avail regions:\n"); 1141 for (mp = availmem_regions; mp->mr_size; mp++) { 1142 s = mp->mr_start; 1143 e = mp->mr_start + mp->mr_size; 1144 debugf(" %08x-%08x -> ", s, e); 1145 /* Check whether this region holds all of the kernel. */ 1146 if (s < kernload && e > phys_kernelend) { 1147 availmem_regions[cnt].mr_start = phys_kernelend; 1148 availmem_regions[cnt++].mr_size = e - phys_kernelend; 1149 e = kernload; 1150 } 1151 /* Look whether this regions starts within the kernel. */ 1152 if (s >= kernload && s < phys_kernelend) { 1153 if (e <= phys_kernelend) 1154 goto empty; 1155 s = phys_kernelend; 1156 } 1157 /* Now look whether this region ends within the kernel. */ 1158 if (e > kernload && e <= phys_kernelend) { 1159 if (s >= kernload) 1160 goto empty; 1161 e = kernload; 1162 } 1163 /* Now page align the start and size of the region. */ 1164 s = round_page(s); 1165 e = trunc_page(e); 1166 if (e < s) 1167 e = s; 1168 sz = e - s; 1169 debugf("%08x-%08x = %x\n", s, e, sz); 1170 1171 /* Check whether some memory is left here. */ 1172 if (sz == 0) { 1173 empty: 1174 memmove(mp, mp + 1, 1175 (cnt - (mp - availmem_regions)) * sizeof(*mp)); 1176 cnt--; 1177 mp--; 1178 continue; 1179 } 1180 1181 /* Do an insertion sort. */ 1182 for (mp1 = availmem_regions; mp1 < mp; mp1++) 1183 if (s < mp1->mr_start) 1184 break; 1185 if (mp1 < mp) { 1186 memmove(mp1 + 1, mp1, (char *)mp - (char *)mp1); 1187 mp1->mr_start = s; 1188 mp1->mr_size = sz; 1189 } else { 1190 mp->mr_start = s; 1191 mp->mr_size = sz; 1192 } 1193 } 1194 availmem_regions_sz = cnt; 1195 1196 /*******************************************************/ 1197 /* Steal physical memory for kernel stack from the end */ 1198 /* of the first avail region */ 1199 /*******************************************************/ 1200 kstack0_sz = KSTACK_PAGES * PAGE_SIZE; 1201 kstack0_phys = availmem_regions[0].mr_start + 1202 availmem_regions[0].mr_size; 1203 kstack0_phys -= kstack0_sz; 1204 availmem_regions[0].mr_size -= kstack0_sz; 1205 1206 /*******************************************************/ 1207 /* Fill in phys_avail table, based on availmem_regions */ 1208 /*******************************************************/ 1209 phys_avail_count = 0; 1210 physsz = 0; 1211 hwphyssz = 0; 1212 TUNABLE_ULONG_FETCH("hw.physmem", (u_long *) &hwphyssz); 1213 1214 debugf("fill in phys_avail:\n"); 1215 for (i = 0, j = 0; i < availmem_regions_sz; i++, j += 2) { 1216 1217 debugf(" region: 0x%08x - 0x%08x (0x%08x)\n", 1218 availmem_regions[i].mr_start, 1219 availmem_regions[i].mr_start + 1220 availmem_regions[i].mr_size, 1221 availmem_regions[i].mr_size); 1222 1223 if (hwphyssz != 0 && 1224 (physsz + availmem_regions[i].mr_size) >= hwphyssz) { 1225 debugf(" hw.physmem adjust\n"); 1226 if (physsz < hwphyssz) { 1227 phys_avail[j] = availmem_regions[i].mr_start; 1228 phys_avail[j + 1] = 1229 availmem_regions[i].mr_start + 1230 hwphyssz - physsz; 1231 physsz = hwphyssz; 1232 phys_avail_count++; 1233 } 1234 break; 1235 } 1236 1237 phys_avail[j] = availmem_regions[i].mr_start; 1238 phys_avail[j + 1] = availmem_regions[i].mr_start + 1239 availmem_regions[i].mr_size; 1240 phys_avail_count++; 1241 physsz += availmem_regions[i].mr_size; 1242 } 1243 physmem = btoc(physsz); 1244 1245 /* Calculate the last available physical address. */ 1246 for (i = 0; phys_avail[i + 2] != 0; i += 2) 1247 ; 1248 Maxmem = powerpc_btop(phys_avail[i + 1]); 1249 1250 debugf("Maxmem = 0x%08lx\n", Maxmem); 1251 debugf("phys_avail_count = %d\n", phys_avail_count); 1252 debugf("physsz = 0x%08x physmem = %ld (0x%08lx)\n", physsz, physmem, 1253 physmem); 1254 1255 /*******************************************************/ 1256 /* Initialize (statically allocated) kernel pmap. */ 1257 /*******************************************************/ 1258 PMAP_LOCK_INIT(kernel_pmap); 1259 kptbl_min = VM_MIN_KERNEL_ADDRESS / PDIR_SIZE; 1260 1261 debugf("kernel_pmap = 0x%08x\n", (uint32_t)kernel_pmap); 1262 debugf("kptbl_min = %d, kernel_ptbls = %d\n", kptbl_min, kernel_ptbls); 1263 debugf("kernel pdir range: 0x%08x - 0x%08x\n", 1264 kptbl_min * PDIR_SIZE, (kptbl_min + kernel_ptbls) * PDIR_SIZE - 1); 1265 1266 /* Initialize kernel pdir */ 1267 for (i = 0; i < kernel_ptbls; i++) 1268 kernel_pmap->pm_pdir[kptbl_min + i] = 1269 (pte_t *)(kernel_pdir + (i * PAGE_SIZE * PTBL_PAGES)); 1270 1271 for (i = 0; i < MAXCPU; i++) { 1272 kernel_pmap->pm_tid[i] = TID_KERNEL; 1273 1274 /* Initialize each CPU's tidbusy entry 0 with kernel_pmap */ 1275 tidbusy[i][0] = kernel_pmap; 1276 } 1277 1278 /* 1279 * Fill in PTEs covering kernel code and data. They are not required 1280 * for address translation, as this area is covered by static TLB1 1281 * entries, but for pte_vatopa() to work correctly with kernel area 1282 * addresses. 1283 */ 1284 for (va = kernstart; va < data_end; va += PAGE_SIZE) { 1285 pte = &(kernel_pmap->pm_pdir[PDIR_IDX(va)][PTBL_IDX(va)]); 1286 pte->rpn = kernload + (va - kernstart); 1287 pte->flags = PTE_M | PTE_SR | PTE_SW | PTE_SX | PTE_WIRED | 1288 PTE_VALID; 1289 } 1290 /* Mark kernel_pmap active on all CPUs */ 1291 CPU_FILL(&kernel_pmap->pm_active); 1292 1293 /* 1294 * Initialize the global pv list lock. 1295 */ 1296 rw_init(&pvh_global_lock, "pmap pv global"); 1297 1298 /*******************************************************/ 1299 /* Final setup */ 1300 /*******************************************************/ 1301 1302 /* Enter kstack0 into kernel map, provide guard page */ 1303 kstack0 = virtual_avail + KSTACK_GUARD_PAGES * PAGE_SIZE; 1304 thread0.td_kstack = kstack0; 1305 thread0.td_kstack_pages = KSTACK_PAGES; 1306 1307 debugf("kstack_sz = 0x%08x\n", kstack0_sz); 1308 debugf("kstack0_phys at 0x%08x - 0x%08x\n", 1309 kstack0_phys, kstack0_phys + kstack0_sz); 1310 debugf("kstack0 at 0x%08x - 0x%08x\n", kstack0, kstack0 + kstack0_sz); 1311 1312 virtual_avail += KSTACK_GUARD_PAGES * PAGE_SIZE + kstack0_sz; 1313 for (i = 0; i < KSTACK_PAGES; i++) { 1314 mmu_booke_kenter(mmu, kstack0, kstack0_phys); 1315 kstack0 += PAGE_SIZE; 1316 kstack0_phys += PAGE_SIZE; 1317 } 1318 1319 debugf("virtual_avail = %08x\n", virtual_avail); 1320 debugf("virtual_end = %08x\n", virtual_end); 1321 1322 debugf("mmu_booke_bootstrap: exit\n"); 1323} 1324 1325void 1326pmap_bootstrap_ap(volatile uint32_t *trcp __unused) 1327{ 1328 int i; 1329 1330 /* 1331 * Finish TLB1 configuration: the BSP already set up its TLB1 and we 1332 * have the snapshot of its contents in the s/w tlb1[] table, so use 1333 * these values directly to (re)program AP's TLB1 hardware. 1334 */ 1335 for (i = bp_ntlb1s; i < tlb1_idx; i++) { 1336 /* Skip invalid entries */ 1337 if (!(tlb1[i].mas1 & MAS1_VALID)) 1338 continue; 1339 1340 tlb1_write_entry(i); 1341 } 1342 1343 set_mas4_defaults(); 1344} 1345 1346/* 1347 * Get the physical page address for the given pmap/virtual address. 1348 */ 1349static vm_paddr_t 1350mmu_booke_extract(mmu_t mmu, pmap_t pmap, vm_offset_t va) 1351{ 1352 vm_paddr_t pa; 1353 1354 PMAP_LOCK(pmap); 1355 pa = pte_vatopa(mmu, pmap, va); 1356 PMAP_UNLOCK(pmap); 1357 1358 return (pa); 1359} 1360 1361/* 1362 * Extract the physical page address associated with the given 1363 * kernel virtual address. 1364 */ 1365static vm_paddr_t 1366mmu_booke_kextract(mmu_t mmu, vm_offset_t va) 1367{ 1368 int i; 1369 1370 /* Check TLB1 mappings */ 1371 for (i = 0; i < tlb1_idx; i++) { 1372 if (!(tlb1[i].mas1 & MAS1_VALID)) 1373 continue; 1374 if (va >= tlb1[i].virt && va < tlb1[i].virt + tlb1[i].size) 1375 return (tlb1[i].phys + (va - tlb1[i].virt)); 1376 } 1377 1378 return (pte_vatopa(mmu, kernel_pmap, va)); 1379} 1380 1381/* 1382 * Initialize the pmap module. 1383 * Called by vm_init, to initialize any structures that the pmap 1384 * system needs to map virtual memory. 1385 */ 1386static void 1387mmu_booke_init(mmu_t mmu) 1388{ 1389 int shpgperproc = PMAP_SHPGPERPROC; 1390 1391 /* 1392 * Initialize the address space (zone) for the pv entries. Set a 1393 * high water mark so that the system can recover from excessive 1394 * numbers of pv entries. 1395 */ 1396 pvzone = uma_zcreate("PV ENTRY", sizeof(struct pv_entry), NULL, NULL, 1397 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_VM | UMA_ZONE_NOFREE); 1398 1399 TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc); 1400 pv_entry_max = shpgperproc * maxproc + cnt.v_page_count; 1401 1402 TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max); 1403 pv_entry_high_water = 9 * (pv_entry_max / 10); 1404 1405 uma_zone_reserve_kva(pvzone, pv_entry_max); 1406 1407 /* Pre-fill pvzone with initial number of pv entries. */ 1408 uma_prealloc(pvzone, PV_ENTRY_ZONE_MIN); 1409 1410 /* Initialize ptbl allocation. */ 1411 ptbl_init(); 1412} 1413 1414/* 1415 * Map a list of wired pages into kernel virtual address space. This is 1416 * intended for temporary mappings which do not need page modification or 1417 * references recorded. Existing mappings in the region are overwritten. 1418 */ 1419static void 1420mmu_booke_qenter(mmu_t mmu, vm_offset_t sva, vm_page_t *m, int count) 1421{ 1422 vm_offset_t va; 1423 1424 va = sva; 1425 while (count-- > 0) { 1426 mmu_booke_kenter(mmu, va, VM_PAGE_TO_PHYS(*m)); 1427 va += PAGE_SIZE; 1428 m++; 1429 } 1430} 1431 1432/* 1433 * Remove page mappings from kernel virtual address space. Intended for 1434 * temporary mappings entered by mmu_booke_qenter. 1435 */ 1436static void 1437mmu_booke_qremove(mmu_t mmu, vm_offset_t sva, int count) 1438{ 1439 vm_offset_t va; 1440 1441 va = sva; 1442 while (count-- > 0) { 1443 mmu_booke_kremove(mmu, va); 1444 va += PAGE_SIZE; 1445 } 1446} 1447 1448/* 1449 * Map a wired page into kernel virtual address space. 1450 */ 1451static void 1452mmu_booke_kenter(mmu_t mmu, vm_offset_t va, vm_paddr_t pa) 1453{ 1454 1455 mmu_booke_kenter_attr(mmu, va, pa, VM_MEMATTR_DEFAULT); 1456} 1457 1458static void 1459mmu_booke_kenter_attr(mmu_t mmu, vm_offset_t va, vm_paddr_t pa, vm_memattr_t ma) 1460{ 1461 unsigned int pdir_idx = PDIR_IDX(va); 1462 unsigned int ptbl_idx = PTBL_IDX(va); 1463 uint32_t flags; 1464 pte_t *pte; 1465 1466 KASSERT(((va >= VM_MIN_KERNEL_ADDRESS) && 1467 (va <= VM_MAX_KERNEL_ADDRESS)), ("mmu_booke_kenter: invalid va")); 1468 1469 flags = PTE_SR | PTE_SW | PTE_SX | PTE_WIRED | PTE_VALID; 1470 flags |= tlb_calc_wimg(pa, ma); 1471 1472 pte = &(kernel_pmap->pm_pdir[pdir_idx][ptbl_idx]); 1473 1474 mtx_lock_spin(&tlbivax_mutex); 1475 tlb_miss_lock(); 1476 1477 if (PTE_ISVALID(pte)) { 1478 1479 CTR1(KTR_PMAP, "%s: replacing entry!", __func__); 1480 1481 /* Flush entry from TLB0 */ 1482 tlb0_flush_entry(va); 1483 } 1484 1485 pte->rpn = pa & ~PTE_PA_MASK; 1486 pte->flags = flags; 1487 1488 //debugf("mmu_booke_kenter: pdir_idx = %d ptbl_idx = %d va=0x%08x " 1489 // "pa=0x%08x rpn=0x%08x flags=0x%08x\n", 1490 // pdir_idx, ptbl_idx, va, pa, pte->rpn, pte->flags); 1491 1492 /* Flush the real memory from the instruction cache. */ 1493 if ((flags & (PTE_I | PTE_G)) == 0) { 1494 __syncicache((void *)va, PAGE_SIZE); 1495 } 1496 1497 tlb_miss_unlock(); 1498 mtx_unlock_spin(&tlbivax_mutex); 1499} 1500 1501/* 1502 * Remove a page from kernel page table. 1503 */ 1504static void 1505mmu_booke_kremove(mmu_t mmu, vm_offset_t va) 1506{ 1507 unsigned int pdir_idx = PDIR_IDX(va); 1508 unsigned int ptbl_idx = PTBL_IDX(va); 1509 pte_t *pte; 1510 1511// CTR2(KTR_PMAP,("%s: s (va = 0x%08x)\n", __func__, va)); 1512 1513 KASSERT(((va >= VM_MIN_KERNEL_ADDRESS) && 1514 (va <= VM_MAX_KERNEL_ADDRESS)), 1515 ("mmu_booke_kremove: invalid va")); 1516 1517 pte = &(kernel_pmap->pm_pdir[pdir_idx][ptbl_idx]); 1518 1519 if (!PTE_ISVALID(pte)) { 1520 1521 CTR1(KTR_PMAP, "%s: invalid pte", __func__); 1522 1523 return; 1524 } 1525 1526 mtx_lock_spin(&tlbivax_mutex); 1527 tlb_miss_lock(); 1528 1529 /* Invalidate entry in TLB0, update PTE. */ 1530 tlb0_flush_entry(va); 1531 pte->flags = 0; 1532 pte->rpn = 0; 1533 1534 tlb_miss_unlock(); 1535 mtx_unlock_spin(&tlbivax_mutex); 1536} 1537 1538/* 1539 * Initialize pmap associated with process 0. 1540 */ 1541static void 1542mmu_booke_pinit0(mmu_t mmu, pmap_t pmap) 1543{ 1544 1545 PMAP_LOCK_INIT(pmap); 1546 mmu_booke_pinit(mmu, pmap); 1547 PCPU_SET(curpmap, pmap); 1548} 1549 1550/* 1551 * Initialize a preallocated and zeroed pmap structure, 1552 * such as one in a vmspace structure. 1553 */ 1554static void 1555mmu_booke_pinit(mmu_t mmu, pmap_t pmap) 1556{ 1557 int i; 1558 1559 CTR4(KTR_PMAP, "%s: pmap = %p, proc %d '%s'", __func__, pmap, 1560 curthread->td_proc->p_pid, curthread->td_proc->p_comm); 1561 1562 KASSERT((pmap != kernel_pmap), ("pmap_pinit: initializing kernel_pmap")); 1563 1564 for (i = 0; i < MAXCPU; i++) 1565 pmap->pm_tid[i] = TID_NONE; 1566 CPU_ZERO(&kernel_pmap->pm_active); 1567 bzero(&pmap->pm_stats, sizeof(pmap->pm_stats)); 1568 bzero(&pmap->pm_pdir, sizeof(pte_t *) * PDIR_NENTRIES); 1569 TAILQ_INIT(&pmap->pm_ptbl_list); 1570} 1571 1572/* 1573 * Release any resources held by the given physical map. 1574 * Called when a pmap initialized by mmu_booke_pinit is being released. 1575 * Should only be called if the map contains no valid mappings. 1576 */ 1577static void 1578mmu_booke_release(mmu_t mmu, pmap_t pmap) 1579{ 1580 1581 KASSERT(pmap->pm_stats.resident_count == 0, 1582 ("pmap_release: pmap resident count %ld != 0", 1583 pmap->pm_stats.resident_count)); 1584} 1585 1586/* 1587 * Insert the given physical page at the specified virtual address in the 1588 * target physical map with the protection requested. If specified the page 1589 * will be wired down. 1590 */ 1591static int 1592mmu_booke_enter(mmu_t mmu, pmap_t pmap, vm_offset_t va, vm_page_t m, 1593 vm_prot_t prot, u_int flags, int8_t psind) 1594{ 1595 int error; 1596 1597 rw_wlock(&pvh_global_lock); 1598 PMAP_LOCK(pmap); 1599 error = mmu_booke_enter_locked(mmu, pmap, va, m, prot, flags, psind); 1600 rw_wunlock(&pvh_global_lock); 1601 PMAP_UNLOCK(pmap); 1602 return (error); 1603} 1604 1605static int 1606mmu_booke_enter_locked(mmu_t mmu, pmap_t pmap, vm_offset_t va, vm_page_t m, 1607 vm_prot_t prot, u_int pmap_flags, int8_t psind __unused) 1608{ 1609 pte_t *pte; 1610 vm_paddr_t pa; 1611 uint32_t flags; 1612 int error, su, sync; 1613 1614 pa = VM_PAGE_TO_PHYS(m); 1615 su = (pmap == kernel_pmap); 1616 sync = 0; 1617 1618 //debugf("mmu_booke_enter_locked: s (pmap=0x%08x su=%d tid=%d m=0x%08x va=0x%08x " 1619 // "pa=0x%08x prot=0x%08x flags=%#x)\n", 1620 // (u_int32_t)pmap, su, pmap->pm_tid, 1621 // (u_int32_t)m, va, pa, prot, flags); 1622 1623 if (su) { 1624 KASSERT(((va >= virtual_avail) && 1625 (va <= VM_MAX_KERNEL_ADDRESS)), 1626 ("mmu_booke_enter_locked: kernel pmap, non kernel va")); 1627 } else { 1628 KASSERT((va <= VM_MAXUSER_ADDRESS), 1629 ("mmu_booke_enter_locked: user pmap, non user va")); 1630 } 1631 if ((m->oflags & VPO_UNMANAGED) == 0 && !vm_page_xbusied(m)) 1632 VM_OBJECT_ASSERT_LOCKED(m->object); 1633 1634 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1635 1636 /* 1637 * If there is an existing mapping, and the physical address has not 1638 * changed, must be protection or wiring change. 1639 */ 1640 if (((pte = pte_find(mmu, pmap, va)) != NULL) && 1641 (PTE_ISVALID(pte)) && (PTE_PA(pte) == pa)) { 1642 1643 /* 1644 * Before actually updating pte->flags we calculate and 1645 * prepare its new value in a helper var. 1646 */ 1647 flags = pte->flags; 1648 flags &= ~(PTE_UW | PTE_UX | PTE_SW | PTE_SX | PTE_MODIFIED); 1649 1650 /* Wiring change, just update stats. */ 1651 if ((pmap_flags & PMAP_ENTER_WIRED) != 0) { 1652 if (!PTE_ISWIRED(pte)) { 1653 flags |= PTE_WIRED; 1654 pmap->pm_stats.wired_count++; 1655 } 1656 } else { 1657 if (PTE_ISWIRED(pte)) { 1658 flags &= ~PTE_WIRED; 1659 pmap->pm_stats.wired_count--; 1660 } 1661 } 1662 1663 if (prot & VM_PROT_WRITE) { 1664 /* Add write permissions. */ 1665 flags |= PTE_SW; 1666 if (!su) 1667 flags |= PTE_UW; 1668 1669 if ((flags & PTE_MANAGED) != 0) 1670 vm_page_aflag_set(m, PGA_WRITEABLE); 1671 } else { 1672 /* Handle modified pages, sense modify status. */ 1673 1674 /* 1675 * The PTE_MODIFIED flag could be set by underlying 1676 * TLB misses since we last read it (above), possibly 1677 * other CPUs could update it so we check in the PTE 1678 * directly rather than rely on that saved local flags 1679 * copy. 1680 */ 1681 if (PTE_ISMODIFIED(pte)) 1682 vm_page_dirty(m); 1683 } 1684 1685 if (prot & VM_PROT_EXECUTE) { 1686 flags |= PTE_SX; 1687 if (!su) 1688 flags |= PTE_UX; 1689 1690 /* 1691 * Check existing flags for execute permissions: if we 1692 * are turning execute permissions on, icache should 1693 * be flushed. 1694 */ 1695 if ((pte->flags & (PTE_UX | PTE_SX)) == 0) 1696 sync++; 1697 } 1698 1699 flags &= ~PTE_REFERENCED; 1700 1701 /* 1702 * The new flags value is all calculated -- only now actually 1703 * update the PTE. 1704 */ 1705 mtx_lock_spin(&tlbivax_mutex); 1706 tlb_miss_lock(); 1707 1708 tlb0_flush_entry(va); 1709 pte->flags = flags; 1710 1711 tlb_miss_unlock(); 1712 mtx_unlock_spin(&tlbivax_mutex); 1713 1714 } else { 1715 /* 1716 * If there is an existing mapping, but it's for a different 1717 * physical address, pte_enter() will delete the old mapping. 1718 */ 1719 //if ((pte != NULL) && PTE_ISVALID(pte)) 1720 // debugf("mmu_booke_enter_locked: replace\n"); 1721 //else 1722 // debugf("mmu_booke_enter_locked: new\n"); 1723 1724 /* Now set up the flags and install the new mapping. */ 1725 flags = (PTE_SR | PTE_VALID); 1726 flags |= PTE_M; 1727 1728 if (!su) 1729 flags |= PTE_UR; 1730 1731 if (prot & VM_PROT_WRITE) { 1732 flags |= PTE_SW; 1733 if (!su) 1734 flags |= PTE_UW; 1735 1736 if ((m->oflags & VPO_UNMANAGED) == 0) 1737 vm_page_aflag_set(m, PGA_WRITEABLE); 1738 } 1739 1740 if (prot & VM_PROT_EXECUTE) { 1741 flags |= PTE_SX; 1742 if (!su) 1743 flags |= PTE_UX; 1744 } 1745 1746 /* If its wired update stats. */ 1747 if ((pmap_flags & PMAP_ENTER_WIRED) != 0) 1748 flags |= PTE_WIRED; 1749 1750 error = pte_enter(mmu, pmap, m, va, flags, 1751 (pmap_flags & PMAP_ENTER_NOSLEEP) != 0); 1752 if (error != 0) 1753 return (KERN_RESOURCE_SHORTAGE); 1754 1755 if ((flags & PMAP_ENTER_WIRED) != 0) 1756 pmap->pm_stats.wired_count++; 1757 1758 /* Flush the real memory from the instruction cache. */ 1759 if (prot & VM_PROT_EXECUTE) 1760 sync++; 1761 } 1762 1763 if (sync && (su || pmap == PCPU_GET(curpmap))) { 1764 __syncicache((void *)va, PAGE_SIZE); 1765 sync = 0; 1766 } 1767 1768 return (KERN_SUCCESS); 1769} 1770 1771/* 1772 * Maps a sequence of resident pages belonging to the same object. 1773 * The sequence begins with the given page m_start. This page is 1774 * mapped at the given virtual address start. Each subsequent page is 1775 * mapped at a virtual address that is offset from start by the same 1776 * amount as the page is offset from m_start within the object. The 1777 * last page in the sequence is the page with the largest offset from 1778 * m_start that can be mapped at a virtual address less than the given 1779 * virtual address end. Not every virtual page between start and end 1780 * is mapped; only those for which a resident page exists with the 1781 * corresponding offset from m_start are mapped. 1782 */ 1783static void 1784mmu_booke_enter_object(mmu_t mmu, pmap_t pmap, vm_offset_t start, 1785 vm_offset_t end, vm_page_t m_start, vm_prot_t prot) 1786{ 1787 vm_page_t m; 1788 vm_pindex_t diff, psize; 1789 1790 VM_OBJECT_ASSERT_LOCKED(m_start->object); 1791 1792 psize = atop(end - start); 1793 m = m_start; 1794 rw_wlock(&pvh_global_lock); 1795 PMAP_LOCK(pmap); 1796 while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) { 1797 mmu_booke_enter_locked(mmu, pmap, start + ptoa(diff), m, 1798 prot & (VM_PROT_READ | VM_PROT_EXECUTE), 1799 PMAP_ENTER_NOSLEEP, 0); 1800 m = TAILQ_NEXT(m, listq); 1801 } 1802 rw_wunlock(&pvh_global_lock); 1803 PMAP_UNLOCK(pmap); 1804} 1805 1806static void 1807mmu_booke_enter_quick(mmu_t mmu, pmap_t pmap, vm_offset_t va, vm_page_t m, 1808 vm_prot_t prot) 1809{ 1810 1811 rw_wlock(&pvh_global_lock); 1812 PMAP_LOCK(pmap); 1813 mmu_booke_enter_locked(mmu, pmap, va, m, 1814 prot & (VM_PROT_READ | VM_PROT_EXECUTE), PMAP_ENTER_NOSLEEP, 1815 0); 1816 rw_wunlock(&pvh_global_lock); 1817 PMAP_UNLOCK(pmap); 1818} 1819 1820/* 1821 * Remove the given range of addresses from the specified map. 1822 * 1823 * It is assumed that the start and end are properly rounded to the page size. 1824 */ 1825static void 1826mmu_booke_remove(mmu_t mmu, pmap_t pmap, vm_offset_t va, vm_offset_t endva) 1827{ 1828 pte_t *pte; 1829 uint8_t hold_flag; 1830 1831 int su = (pmap == kernel_pmap); 1832 1833 //debugf("mmu_booke_remove: s (su = %d pmap=0x%08x tid=%d va=0x%08x endva=0x%08x)\n", 1834 // su, (u_int32_t)pmap, pmap->pm_tid, va, endva); 1835 1836 if (su) { 1837 KASSERT(((va >= virtual_avail) && 1838 (va <= VM_MAX_KERNEL_ADDRESS)), 1839 ("mmu_booke_remove: kernel pmap, non kernel va")); 1840 } else { 1841 KASSERT((va <= VM_MAXUSER_ADDRESS), 1842 ("mmu_booke_remove: user pmap, non user va")); 1843 } 1844 1845 if (PMAP_REMOVE_DONE(pmap)) { 1846 //debugf("mmu_booke_remove: e (empty)\n"); 1847 return; 1848 } 1849 1850 hold_flag = PTBL_HOLD_FLAG(pmap); 1851 //debugf("mmu_booke_remove: hold_flag = %d\n", hold_flag); 1852 1853 rw_wlock(&pvh_global_lock); 1854 PMAP_LOCK(pmap); 1855 for (; va < endva; va += PAGE_SIZE) { 1856 pte = pte_find(mmu, pmap, va); 1857 if ((pte != NULL) && PTE_ISVALID(pte)) 1858 pte_remove(mmu, pmap, va, hold_flag); 1859 } 1860 PMAP_UNLOCK(pmap); 1861 rw_wunlock(&pvh_global_lock); 1862 1863 //debugf("mmu_booke_remove: e\n"); 1864} 1865 1866/* 1867 * Remove physical page from all pmaps in which it resides. 1868 */ 1869static void 1870mmu_booke_remove_all(mmu_t mmu, vm_page_t m) 1871{ 1872 pv_entry_t pv, pvn; 1873 uint8_t hold_flag; 1874 1875 rw_wlock(&pvh_global_lock); 1876 for (pv = TAILQ_FIRST(&m->md.pv_list); pv != NULL; pv = pvn) { 1877 pvn = TAILQ_NEXT(pv, pv_link); 1878 1879 PMAP_LOCK(pv->pv_pmap); 1880 hold_flag = PTBL_HOLD_FLAG(pv->pv_pmap); 1881 pte_remove(mmu, pv->pv_pmap, pv->pv_va, hold_flag); 1882 PMAP_UNLOCK(pv->pv_pmap); 1883 } 1884 vm_page_aflag_clear(m, PGA_WRITEABLE); 1885 rw_wunlock(&pvh_global_lock); 1886} 1887 1888/* 1889 * Map a range of physical addresses into kernel virtual address space. 1890 */ 1891static vm_offset_t 1892mmu_booke_map(mmu_t mmu, vm_offset_t *virt, vm_paddr_t pa_start, 1893 vm_paddr_t pa_end, int prot) 1894{ 1895 vm_offset_t sva = *virt; 1896 vm_offset_t va = sva; 1897 1898 //debugf("mmu_booke_map: s (sva = 0x%08x pa_start = 0x%08x pa_end = 0x%08x)\n", 1899 // sva, pa_start, pa_end); 1900 1901 while (pa_start < pa_end) { 1902 mmu_booke_kenter(mmu, va, pa_start); 1903 va += PAGE_SIZE; 1904 pa_start += PAGE_SIZE; 1905 } 1906 *virt = va; 1907 1908 //debugf("mmu_booke_map: e (va = 0x%08x)\n", va); 1909 return (sva); 1910} 1911 1912/* 1913 * The pmap must be activated before it's address space can be accessed in any 1914 * way. 1915 */ 1916static void 1917mmu_booke_activate(mmu_t mmu, struct thread *td) 1918{ 1919 pmap_t pmap; 1920 u_int cpuid; 1921 1922 pmap = &td->td_proc->p_vmspace->vm_pmap; 1923 1924 CTR5(KTR_PMAP, "%s: s (td = %p, proc = '%s', id = %d, pmap = 0x%08x)", 1925 __func__, td, td->td_proc->p_comm, td->td_proc->p_pid, pmap); 1926 1927 KASSERT((pmap != kernel_pmap), ("mmu_booke_activate: kernel_pmap!")); 1928 1929 sched_pin(); 1930 1931 cpuid = PCPU_GET(cpuid); 1932 CPU_SET_ATOMIC(cpuid, &pmap->pm_active); 1933 PCPU_SET(curpmap, pmap); 1934 1935 if (pmap->pm_tid[cpuid] == TID_NONE) 1936 tid_alloc(pmap); 1937 1938 /* Load PID0 register with pmap tid value. */ 1939 mtspr(SPR_PID0, pmap->pm_tid[cpuid]); 1940 __asm __volatile("isync"); 1941 1942 sched_unpin(); 1943 1944 CTR3(KTR_PMAP, "%s: e (tid = %d for '%s')", __func__, 1945 pmap->pm_tid[PCPU_GET(cpuid)], td->td_proc->p_comm); 1946} 1947 1948/* 1949 * Deactivate the specified process's address space. 1950 */ 1951static void 1952mmu_booke_deactivate(mmu_t mmu, struct thread *td) 1953{ 1954 pmap_t pmap; 1955 1956 pmap = &td->td_proc->p_vmspace->vm_pmap; 1957 1958 CTR5(KTR_PMAP, "%s: td=%p, proc = '%s', id = %d, pmap = 0x%08x", 1959 __func__, td, td->td_proc->p_comm, td->td_proc->p_pid, pmap); 1960 1961 CPU_CLR_ATOMIC(PCPU_GET(cpuid), &pmap->pm_active); 1962 PCPU_SET(curpmap, NULL); 1963} 1964 1965/* 1966 * Copy the range specified by src_addr/len 1967 * from the source map to the range dst_addr/len 1968 * in the destination map. 1969 * 1970 * This routine is only advisory and need not do anything. 1971 */ 1972static void 1973mmu_booke_copy(mmu_t mmu, pmap_t dst_pmap, pmap_t src_pmap, 1974 vm_offset_t dst_addr, vm_size_t len, vm_offset_t src_addr) 1975{ 1976 1977} 1978 1979/* 1980 * Set the physical protection on the specified range of this map as requested. 1981 */ 1982static void 1983mmu_booke_protect(mmu_t mmu, pmap_t pmap, vm_offset_t sva, vm_offset_t eva, 1984 vm_prot_t prot) 1985{ 1986 vm_offset_t va; 1987 vm_page_t m; 1988 pte_t *pte; 1989 1990 if ((prot & VM_PROT_READ) == VM_PROT_NONE) { 1991 mmu_booke_remove(mmu, pmap, sva, eva); 1992 return; 1993 } 1994 1995 if (prot & VM_PROT_WRITE) 1996 return; 1997 1998 PMAP_LOCK(pmap); 1999 for (va = sva; va < eva; va += PAGE_SIZE) { 2000 if ((pte = pte_find(mmu, pmap, va)) != NULL) { 2001 if (PTE_ISVALID(pte)) { 2002 m = PHYS_TO_VM_PAGE(PTE_PA(pte)); 2003 2004 mtx_lock_spin(&tlbivax_mutex); 2005 tlb_miss_lock(); 2006 2007 /* Handle modified pages. */ 2008 if (PTE_ISMODIFIED(pte) && PTE_ISMANAGED(pte)) 2009 vm_page_dirty(m); 2010 2011 tlb0_flush_entry(va); 2012 pte->flags &= ~(PTE_UW | PTE_SW | PTE_MODIFIED); 2013 2014 tlb_miss_unlock(); 2015 mtx_unlock_spin(&tlbivax_mutex); 2016 } 2017 } 2018 } 2019 PMAP_UNLOCK(pmap); 2020} 2021 2022/* 2023 * Clear the write and modified bits in each of the given page's mappings. 2024 */ 2025static void 2026mmu_booke_remove_write(mmu_t mmu, vm_page_t m) 2027{ 2028 pv_entry_t pv; 2029 pte_t *pte; 2030 2031 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2032 ("mmu_booke_remove_write: page %p is not managed", m)); 2033 2034 /* 2035 * If the page is not exclusive busied, then PGA_WRITEABLE cannot be 2036 * set by another thread while the object is locked. Thus, 2037 * if PGA_WRITEABLE is clear, no page table entries need updating. 2038 */ 2039 VM_OBJECT_ASSERT_WLOCKED(m->object); 2040 if (!vm_page_xbusied(m) && (m->aflags & PGA_WRITEABLE) == 0) 2041 return; 2042 rw_wlock(&pvh_global_lock); 2043 TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) { 2044 PMAP_LOCK(pv->pv_pmap); 2045 if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL) { 2046 if (PTE_ISVALID(pte)) { 2047 m = PHYS_TO_VM_PAGE(PTE_PA(pte)); 2048 2049 mtx_lock_spin(&tlbivax_mutex); 2050 tlb_miss_lock(); 2051 2052 /* Handle modified pages. */ 2053 if (PTE_ISMODIFIED(pte)) 2054 vm_page_dirty(m); 2055 2056 /* Flush mapping from TLB0. */ 2057 pte->flags &= ~(PTE_UW | PTE_SW | PTE_MODIFIED); 2058 2059 tlb_miss_unlock(); 2060 mtx_unlock_spin(&tlbivax_mutex); 2061 } 2062 } 2063 PMAP_UNLOCK(pv->pv_pmap); 2064 } 2065 vm_page_aflag_clear(m, PGA_WRITEABLE); 2066 rw_wunlock(&pvh_global_lock); 2067} 2068 2069static void 2070mmu_booke_sync_icache(mmu_t mmu, pmap_t pm, vm_offset_t va, vm_size_t sz) 2071{ 2072 pte_t *pte; 2073 pmap_t pmap; 2074 vm_page_t m; 2075 vm_offset_t addr; 2076 vm_paddr_t pa; 2077 int active, valid; 2078 2079 va = trunc_page(va); 2080 sz = round_page(sz); 2081 2082 rw_wlock(&pvh_global_lock); 2083 pmap = PCPU_GET(curpmap); 2084 active = (pm == kernel_pmap || pm == pmap) ? 1 : 0; 2085 while (sz > 0) { 2086 PMAP_LOCK(pm); 2087 pte = pte_find(mmu, pm, va); 2088 valid = (pte != NULL && PTE_ISVALID(pte)) ? 1 : 0; 2089 if (valid) 2090 pa = PTE_PA(pte); 2091 PMAP_UNLOCK(pm); 2092 if (valid) { 2093 if (!active) { 2094 /* Create a mapping in the active pmap. */ 2095 addr = 0; 2096 m = PHYS_TO_VM_PAGE(pa); 2097 PMAP_LOCK(pmap); 2098 pte_enter(mmu, pmap, m, addr, 2099 PTE_SR | PTE_VALID | PTE_UR, FALSE); 2100 __syncicache((void *)addr, PAGE_SIZE); 2101 pte_remove(mmu, pmap, addr, PTBL_UNHOLD); 2102 PMAP_UNLOCK(pmap); 2103 } else 2104 __syncicache((void *)va, PAGE_SIZE); 2105 } 2106 va += PAGE_SIZE; 2107 sz -= PAGE_SIZE; 2108 } 2109 rw_wunlock(&pvh_global_lock); 2110} 2111 2112/* 2113 * Atomically extract and hold the physical page with the given 2114 * pmap and virtual address pair if that mapping permits the given 2115 * protection. 2116 */ 2117static vm_page_t 2118mmu_booke_extract_and_hold(mmu_t mmu, pmap_t pmap, vm_offset_t va, 2119 vm_prot_t prot) 2120{ 2121 pte_t *pte; 2122 vm_page_t m; 2123 uint32_t pte_wbit; 2124 vm_paddr_t pa; 2125 2126 m = NULL; 2127 pa = 0; 2128 PMAP_LOCK(pmap); 2129retry: 2130 pte = pte_find(mmu, pmap, va); 2131 if ((pte != NULL) && PTE_ISVALID(pte)) { 2132 if (pmap == kernel_pmap) 2133 pte_wbit = PTE_SW; 2134 else 2135 pte_wbit = PTE_UW; 2136 2137 if ((pte->flags & pte_wbit) || ((prot & VM_PROT_WRITE) == 0)) { 2138 if (vm_page_pa_tryrelock(pmap, PTE_PA(pte), &pa)) 2139 goto retry; 2140 m = PHYS_TO_VM_PAGE(PTE_PA(pte)); 2141 vm_page_hold(m); 2142 } 2143 } 2144 2145 PA_UNLOCK_COND(pa); 2146 PMAP_UNLOCK(pmap); 2147 return (m); 2148} 2149 2150/* 2151 * Initialize a vm_page's machine-dependent fields. 2152 */ 2153static void 2154mmu_booke_page_init(mmu_t mmu, vm_page_t m) 2155{ 2156 2157 TAILQ_INIT(&m->md.pv_list); 2158} 2159 2160/* 2161 * mmu_booke_zero_page_area zeros the specified hardware page by 2162 * mapping it into virtual memory and using bzero to clear 2163 * its contents. 2164 * 2165 * off and size must reside within a single page. 2166 */ 2167static void 2168mmu_booke_zero_page_area(mmu_t mmu, vm_page_t m, int off, int size) 2169{ 2170 vm_offset_t va; 2171 2172 /* XXX KASSERT off and size are within a single page? */ 2173 2174 mtx_lock(&zero_page_mutex); 2175 va = zero_page_va; 2176 2177 mmu_booke_kenter(mmu, va, VM_PAGE_TO_PHYS(m)); 2178 bzero((caddr_t)va + off, size); 2179 mmu_booke_kremove(mmu, va); 2180 2181 mtx_unlock(&zero_page_mutex); 2182} 2183 2184/* 2185 * mmu_booke_zero_page zeros the specified hardware page. 2186 */ 2187static void 2188mmu_booke_zero_page(mmu_t mmu, vm_page_t m) 2189{ 2190 2191 mmu_booke_zero_page_area(mmu, m, 0, PAGE_SIZE); 2192} 2193 2194/* 2195 * mmu_booke_copy_page copies the specified (machine independent) page by 2196 * mapping the page into virtual memory and using memcopy to copy the page, 2197 * one machine dependent page at a time. 2198 */ 2199static void 2200mmu_booke_copy_page(mmu_t mmu, vm_page_t sm, vm_page_t dm) 2201{ 2202 vm_offset_t sva, dva; 2203 2204 sva = copy_page_src_va; 2205 dva = copy_page_dst_va; 2206 2207 mtx_lock(©_page_mutex); 2208 mmu_booke_kenter(mmu, sva, VM_PAGE_TO_PHYS(sm)); 2209 mmu_booke_kenter(mmu, dva, VM_PAGE_TO_PHYS(dm)); 2210 memcpy((caddr_t)dva, (caddr_t)sva, PAGE_SIZE); 2211 mmu_booke_kremove(mmu, dva); 2212 mmu_booke_kremove(mmu, sva); 2213 mtx_unlock(©_page_mutex); 2214} 2215 2216static inline void 2217mmu_booke_copy_pages(mmu_t mmu, vm_page_t *ma, vm_offset_t a_offset, 2218 vm_page_t *mb, vm_offset_t b_offset, int xfersize) 2219{ 2220 void *a_cp, *b_cp; 2221 vm_offset_t a_pg_offset, b_pg_offset; 2222 int cnt; 2223 2224 mtx_lock(©_page_mutex); 2225 while (xfersize > 0) { 2226 a_pg_offset = a_offset & PAGE_MASK; 2227 cnt = min(xfersize, PAGE_SIZE - a_pg_offset); 2228 mmu_booke_kenter(mmu, copy_page_src_va, 2229 VM_PAGE_TO_PHYS(ma[a_offset >> PAGE_SHIFT])); 2230 a_cp = (char *)copy_page_src_va + a_pg_offset; 2231 b_pg_offset = b_offset & PAGE_MASK; 2232 cnt = min(cnt, PAGE_SIZE - b_pg_offset); 2233 mmu_booke_kenter(mmu, copy_page_dst_va, 2234 VM_PAGE_TO_PHYS(mb[b_offset >> PAGE_SHIFT])); 2235 b_cp = (char *)copy_page_dst_va + b_pg_offset; 2236 bcopy(a_cp, b_cp, cnt); 2237 mmu_booke_kremove(mmu, copy_page_dst_va); 2238 mmu_booke_kremove(mmu, copy_page_src_va); 2239 a_offset += cnt; 2240 b_offset += cnt; 2241 xfersize -= cnt; 2242 } 2243 mtx_unlock(©_page_mutex); 2244} 2245 2246/* 2247 * mmu_booke_zero_page_idle zeros the specified hardware page by mapping it 2248 * into virtual memory and using bzero to clear its contents. This is intended 2249 * to be called from the vm_pagezero process only and outside of Giant. No 2250 * lock is required. 2251 */ 2252static void 2253mmu_booke_zero_page_idle(mmu_t mmu, vm_page_t m) 2254{ 2255 vm_offset_t va; 2256 2257 va = zero_page_idle_va; 2258 mmu_booke_kenter(mmu, va, VM_PAGE_TO_PHYS(m)); 2259 bzero((caddr_t)va, PAGE_SIZE); 2260 mmu_booke_kremove(mmu, va); 2261} 2262 2263/* 2264 * Return whether or not the specified physical page was modified 2265 * in any of physical maps. 2266 */ 2267static boolean_t 2268mmu_booke_is_modified(mmu_t mmu, vm_page_t m) 2269{ 2270 pte_t *pte; 2271 pv_entry_t pv; 2272 boolean_t rv; 2273 2274 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2275 ("mmu_booke_is_modified: page %p is not managed", m)); 2276 rv = FALSE; 2277 2278 /* 2279 * If the page is not exclusive busied, then PGA_WRITEABLE cannot be 2280 * concurrently set while the object is locked. Thus, if PGA_WRITEABLE 2281 * is clear, no PTEs can be modified. 2282 */ 2283 VM_OBJECT_ASSERT_WLOCKED(m->object); 2284 if (!vm_page_xbusied(m) && (m->aflags & PGA_WRITEABLE) == 0) 2285 return (rv); 2286 rw_wlock(&pvh_global_lock); 2287 TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) { 2288 PMAP_LOCK(pv->pv_pmap); 2289 if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL && 2290 PTE_ISVALID(pte)) { 2291 if (PTE_ISMODIFIED(pte)) 2292 rv = TRUE; 2293 } 2294 PMAP_UNLOCK(pv->pv_pmap); 2295 if (rv) 2296 break; 2297 } 2298 rw_wunlock(&pvh_global_lock); 2299 return (rv); 2300} 2301 2302/* 2303 * Return whether or not the specified virtual address is eligible 2304 * for prefault. 2305 */ 2306static boolean_t 2307mmu_booke_is_prefaultable(mmu_t mmu, pmap_t pmap, vm_offset_t addr) 2308{ 2309 2310 return (FALSE); 2311} 2312 2313/* 2314 * Return whether or not the specified physical page was referenced 2315 * in any physical maps. 2316 */ 2317static boolean_t 2318mmu_booke_is_referenced(mmu_t mmu, vm_page_t m) 2319{ 2320 pte_t *pte; 2321 pv_entry_t pv; 2322 boolean_t rv; 2323 2324 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2325 ("mmu_booke_is_referenced: page %p is not managed", m)); 2326 rv = FALSE; 2327 rw_wlock(&pvh_global_lock); 2328 TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) { 2329 PMAP_LOCK(pv->pv_pmap); 2330 if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL && 2331 PTE_ISVALID(pte)) { 2332 if (PTE_ISREFERENCED(pte)) 2333 rv = TRUE; 2334 } 2335 PMAP_UNLOCK(pv->pv_pmap); 2336 if (rv) 2337 break; 2338 } 2339 rw_wunlock(&pvh_global_lock); 2340 return (rv); 2341} 2342 2343/* 2344 * Clear the modify bits on the specified physical page. 2345 */ 2346static void 2347mmu_booke_clear_modify(mmu_t mmu, vm_page_t m) 2348{ 2349 pte_t *pte; 2350 pv_entry_t pv; 2351 2352 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2353 ("mmu_booke_clear_modify: page %p is not managed", m)); 2354 VM_OBJECT_ASSERT_WLOCKED(m->object); 2355 KASSERT(!vm_page_xbusied(m), 2356 ("mmu_booke_clear_modify: page %p is exclusive busied", m)); 2357 2358 /* 2359 * If the page is not PG_AWRITEABLE, then no PTEs can be modified. 2360 * If the object containing the page is locked and the page is not 2361 * exclusive busied, then PG_AWRITEABLE cannot be concurrently set. 2362 */ 2363 if ((m->aflags & PGA_WRITEABLE) == 0) 2364 return; 2365 rw_wlock(&pvh_global_lock); 2366 TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) { 2367 PMAP_LOCK(pv->pv_pmap); 2368 if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL && 2369 PTE_ISVALID(pte)) { 2370 mtx_lock_spin(&tlbivax_mutex); 2371 tlb_miss_lock(); 2372 2373 if (pte->flags & (PTE_SW | PTE_UW | PTE_MODIFIED)) { 2374 tlb0_flush_entry(pv->pv_va); 2375 pte->flags &= ~(PTE_SW | PTE_UW | PTE_MODIFIED | 2376 PTE_REFERENCED); 2377 } 2378 2379 tlb_miss_unlock(); 2380 mtx_unlock_spin(&tlbivax_mutex); 2381 } 2382 PMAP_UNLOCK(pv->pv_pmap); 2383 } 2384 rw_wunlock(&pvh_global_lock); 2385} 2386 2387/* 2388 * Return a count of reference bits for a page, clearing those bits. 2389 * It is not necessary for every reference bit to be cleared, but it 2390 * is necessary that 0 only be returned when there are truly no 2391 * reference bits set. 2392 * 2393 * XXX: The exact number of bits to check and clear is a matter that 2394 * should be tested and standardized at some point in the future for 2395 * optimal aging of shared pages. 2396 */ 2397static int 2398mmu_booke_ts_referenced(mmu_t mmu, vm_page_t m) 2399{ 2400 pte_t *pte; 2401 pv_entry_t pv; 2402 int count; 2403 2404 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2405 ("mmu_booke_ts_referenced: page %p is not managed", m)); 2406 count = 0; 2407 rw_wlock(&pvh_global_lock); 2408 TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) { 2409 PMAP_LOCK(pv->pv_pmap); 2410 if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL && 2411 PTE_ISVALID(pte)) { 2412 if (PTE_ISREFERENCED(pte)) { 2413 mtx_lock_spin(&tlbivax_mutex); 2414 tlb_miss_lock(); 2415 2416 tlb0_flush_entry(pv->pv_va); 2417 pte->flags &= ~PTE_REFERENCED; 2418 2419 tlb_miss_unlock(); 2420 mtx_unlock_spin(&tlbivax_mutex); 2421 2422 if (++count > 4) { 2423 PMAP_UNLOCK(pv->pv_pmap); 2424 break; 2425 } 2426 } 2427 } 2428 PMAP_UNLOCK(pv->pv_pmap); 2429 } 2430 rw_wunlock(&pvh_global_lock); 2431 return (count); 2432} 2433 2434/* 2435 * Change wiring attribute for a map/virtual-address pair. 2436 */ 2437static void 2438mmu_booke_change_wiring(mmu_t mmu, pmap_t pmap, vm_offset_t va, boolean_t wired) 2439{ 2440 pte_t *pte; 2441 2442 PMAP_LOCK(pmap); 2443 if ((pte = pte_find(mmu, pmap, va)) != NULL) { 2444 if (wired) { 2445 if (!PTE_ISWIRED(pte)) { 2446 pte->flags |= PTE_WIRED; 2447 pmap->pm_stats.wired_count++; 2448 } 2449 } else { 2450 if (PTE_ISWIRED(pte)) { 2451 pte->flags &= ~PTE_WIRED; 2452 pmap->pm_stats.wired_count--; 2453 } 2454 } 2455 } 2456 PMAP_UNLOCK(pmap); 2457} 2458 2459/* 2460 * Return true if the pmap's pv is one of the first 16 pvs linked to from this 2461 * page. This count may be changed upwards or downwards in the future; it is 2462 * only necessary that true be returned for a small subset of pmaps for proper 2463 * page aging. 2464 */ 2465static boolean_t 2466mmu_booke_page_exists_quick(mmu_t mmu, pmap_t pmap, vm_page_t m) 2467{ 2468 pv_entry_t pv; 2469 int loops; 2470 boolean_t rv; 2471 2472 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2473 ("mmu_booke_page_exists_quick: page %p is not managed", m)); 2474 loops = 0; 2475 rv = FALSE; 2476 rw_wlock(&pvh_global_lock); 2477 TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) { 2478 if (pv->pv_pmap == pmap) { 2479 rv = TRUE; 2480 break; 2481 } 2482 if (++loops >= 16) 2483 break; 2484 } 2485 rw_wunlock(&pvh_global_lock); 2486 return (rv); 2487} 2488 2489/* 2490 * Return the number of managed mappings to the given physical page that are 2491 * wired. 2492 */ 2493static int 2494mmu_booke_page_wired_mappings(mmu_t mmu, vm_page_t m) 2495{ 2496 pv_entry_t pv; 2497 pte_t *pte; 2498 int count = 0; 2499 2500 if ((m->oflags & VPO_UNMANAGED) != 0) 2501 return (count); 2502 rw_wlock(&pvh_global_lock); 2503 TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) { 2504 PMAP_LOCK(pv->pv_pmap); 2505 if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL) 2506 if (PTE_ISVALID(pte) && PTE_ISWIRED(pte)) 2507 count++; 2508 PMAP_UNLOCK(pv->pv_pmap); 2509 } 2510 rw_wunlock(&pvh_global_lock); 2511 return (count); 2512} 2513 2514static int 2515mmu_booke_dev_direct_mapped(mmu_t mmu, vm_paddr_t pa, vm_size_t size) 2516{ 2517 int i; 2518 vm_offset_t va; 2519 2520 /* 2521 * This currently does not work for entries that 2522 * overlap TLB1 entries. 2523 */ 2524 for (i = 0; i < tlb1_idx; i ++) { 2525 if (tlb1_iomapped(i, pa, size, &va) == 0) 2526 return (0); 2527 } 2528 2529 return (EFAULT); 2530} 2531 2532vm_offset_t 2533mmu_booke_dumpsys_map(mmu_t mmu, struct pmap_md *md, vm_size_t ofs, 2534 vm_size_t *sz) 2535{ 2536 vm_paddr_t pa, ppa; 2537 vm_offset_t va; 2538 vm_size_t gran; 2539 2540 /* Raw physical memory dumps don't have a virtual address. */ 2541 if (md->md_vaddr == ~0UL) { 2542 /* We always map a 256MB page at 256M. */ 2543 gran = 256 * 1024 * 1024; 2544 pa = md->md_paddr + ofs; 2545 ppa = pa & ~(gran - 1); 2546 ofs = pa - ppa; 2547 va = gran; 2548 tlb1_set_entry(va, ppa, gran, _TLB_ENTRY_IO); 2549 if (*sz > (gran - ofs)) 2550 *sz = gran - ofs; 2551 return (va + ofs); 2552 } 2553 2554 /* Minidumps are based on virtual memory addresses. */ 2555 va = md->md_vaddr + ofs; 2556 if (va >= kernstart + kernsize) { 2557 gran = PAGE_SIZE - (va & PAGE_MASK); 2558 if (*sz > gran) 2559 *sz = gran; 2560 } 2561 return (va); 2562} 2563 2564void 2565mmu_booke_dumpsys_unmap(mmu_t mmu, struct pmap_md *md, vm_size_t ofs, 2566 vm_offset_t va) 2567{ 2568 2569 /* Raw physical memory dumps don't have a virtual address. */ 2570 if (md->md_vaddr == ~0UL) { 2571 tlb1_idx--; 2572 tlb1[tlb1_idx].mas1 = 0; 2573 tlb1[tlb1_idx].mas2 = 0; 2574 tlb1[tlb1_idx].mas3 = 0; 2575 tlb1_write_entry(tlb1_idx); 2576 return; 2577 } 2578 2579 /* Minidumps are based on virtual memory addresses. */ 2580 /* Nothing to do... */ 2581} 2582 2583struct pmap_md * 2584mmu_booke_scan_md(mmu_t mmu, struct pmap_md *prev) 2585{ 2586 static struct pmap_md md; 2587 pte_t *pte; 2588 vm_offset_t va; 2589 2590 if (dumpsys_minidump) { 2591 md.md_paddr = ~0UL; /* Minidumps use virtual addresses. */ 2592 if (prev == NULL) { 2593 /* 1st: kernel .data and .bss. */ 2594 md.md_index = 1; 2595 md.md_vaddr = trunc_page((uintptr_t)_etext); 2596 md.md_size = round_page((uintptr_t)_end) - md.md_vaddr; 2597 return (&md); 2598 } 2599 switch (prev->md_index) { 2600 case 1: 2601 /* 2nd: msgbuf and tables (see pmap_bootstrap()). */ 2602 md.md_index = 2; 2603 md.md_vaddr = data_start; 2604 md.md_size = data_end - data_start; 2605 break; 2606 case 2: 2607 /* 3rd: kernel VM. */ 2608 va = prev->md_vaddr + prev->md_size; 2609 /* Find start of next chunk (from va). */ 2610 while (va < virtual_end) { 2611 /* Don't dump the buffer cache. */ 2612 if (va >= kmi.buffer_sva && 2613 va < kmi.buffer_eva) { 2614 va = kmi.buffer_eva; 2615 continue; 2616 } 2617 pte = pte_find(mmu, kernel_pmap, va); 2618 if (pte != NULL && PTE_ISVALID(pte)) 2619 break; 2620 va += PAGE_SIZE; 2621 } 2622 if (va < virtual_end) { 2623 md.md_vaddr = va; 2624 va += PAGE_SIZE; 2625 /* Find last page in chunk. */ 2626 while (va < virtual_end) { 2627 /* Don't run into the buffer cache. */ 2628 if (va == kmi.buffer_sva) 2629 break; 2630 pte = pte_find(mmu, kernel_pmap, va); 2631 if (pte == NULL || !PTE_ISVALID(pte)) 2632 break; 2633 va += PAGE_SIZE; 2634 } 2635 md.md_size = va - md.md_vaddr; 2636 break; 2637 } 2638 md.md_index = 3; 2639 /* FALLTHROUGH */ 2640 default: 2641 return (NULL); 2642 } 2643 } else { /* minidumps */ 2644 mem_regions(&physmem_regions, &physmem_regions_sz, 2645 &availmem_regions, &availmem_regions_sz); 2646 2647 if (prev == NULL) { 2648 /* first physical chunk. */ 2649 md.md_paddr = physmem_regions[0].mr_start; 2650 md.md_size = physmem_regions[0].mr_size; 2651 md.md_vaddr = ~0UL; 2652 md.md_index = 1; 2653 } else if (md.md_index < physmem_regions_sz) { 2654 md.md_paddr = physmem_regions[md.md_index].mr_start; 2655 md.md_size = physmem_regions[md.md_index].mr_size; 2656 md.md_vaddr = ~0UL; 2657 md.md_index++; 2658 } else { 2659 /* There's no next physical chunk. */ 2660 return (NULL); 2661 } 2662 } 2663 2664 return (&md); 2665} 2666 2667/* 2668 * Map a set of physical memory pages into the kernel virtual address space. 2669 * Return a pointer to where it is mapped. This routine is intended to be used 2670 * for mapping device memory, NOT real memory. 2671 */ 2672static void * 2673mmu_booke_mapdev(mmu_t mmu, vm_paddr_t pa, vm_size_t size) 2674{ 2675 2676 return (mmu_booke_mapdev_attr(mmu, pa, size, VM_MEMATTR_DEFAULT)); 2677} 2678 2679static void * 2680mmu_booke_mapdev_attr(mmu_t mmu, vm_paddr_t pa, vm_size_t size, vm_memattr_t ma) 2681{ 2682 void *res; 2683 uintptr_t va; 2684 vm_size_t sz; 2685 int i; 2686 2687 /* 2688 * Check if this is premapped in TLB1. Note: this should probably also 2689 * check whether a sequence of TLB1 entries exist that match the 2690 * requirement, but now only checks the easy case. 2691 */ 2692 if (ma == VM_MEMATTR_DEFAULT) { 2693 for (i = 0; i < tlb1_idx; i++) { 2694 if (!(tlb1[i].mas1 & MAS1_VALID)) 2695 continue; 2696 if (pa >= tlb1[i].phys && 2697 (pa + size) <= (tlb1[i].phys + tlb1[i].size)) 2698 return (void *)(tlb1[i].virt + 2699 (pa - tlb1[i].phys)); 2700 } 2701 } 2702 2703 size = roundup(size, PAGE_SIZE); 2704 2705 /* 2706 * We leave a hole for device direct mapping between the maximum user 2707 * address (0x8000000) and the minimum KVA address (0xc0000000). If 2708 * devices are in there, just map them 1:1. If not, map them to the 2709 * device mapping area about VM_MAX_KERNEL_ADDRESS. These mapped 2710 * addresses should be pulled from an allocator, but since we do not 2711 * ever free TLB1 entries, it is safe just to increment a counter. 2712 * Note that there isn't a lot of address space here (128 MB) and it 2713 * is not at all difficult to imagine running out, since that is a 4:1 2714 * compression from the 0xc0000000 - 0xf0000000 address space that gets 2715 * mapped there. 2716 */ 2717 if (pa >= (VM_MAXUSER_ADDRESS + PAGE_SIZE) && 2718 (pa + size - 1) < VM_MIN_KERNEL_ADDRESS) 2719 va = pa; 2720 else 2721 va = atomic_fetchadd_int(&tlb1_map_base, size); 2722 res = (void *)va; 2723 2724 do { 2725 sz = 1 << (ilog2(size) & ~1); 2726 if (bootverbose) 2727 printf("Wiring VA=%x to PA=%x (size=%x), " 2728 "using TLB1[%d]\n", va, pa, sz, tlb1_idx); 2729 tlb1_set_entry(va, pa, sz, tlb_calc_wimg(pa, ma)); 2730 size -= sz; 2731 pa += sz; 2732 va += sz; 2733 } while (size > 0); 2734 2735 return (res); 2736} 2737 2738/* 2739 * 'Unmap' a range mapped by mmu_booke_mapdev(). 2740 */ 2741static void 2742mmu_booke_unmapdev(mmu_t mmu, vm_offset_t va, vm_size_t size) 2743{ 2744#ifdef SUPPORTS_SHRINKING_TLB1 2745 vm_offset_t base, offset; 2746 2747 /* 2748 * Unmap only if this is inside kernel virtual space. 2749 */ 2750 if ((va >= VM_MIN_KERNEL_ADDRESS) && (va <= VM_MAX_KERNEL_ADDRESS)) { 2751 base = trunc_page(va); 2752 offset = va & PAGE_MASK; 2753 size = roundup(offset + size, PAGE_SIZE); 2754 kva_free(base, size); 2755 } 2756#endif 2757} 2758 2759/* 2760 * mmu_booke_object_init_pt preloads the ptes for a given object into the 2761 * specified pmap. This eliminates the blast of soft faults on process startup 2762 * and immediately after an mmap. 2763 */ 2764static void 2765mmu_booke_object_init_pt(mmu_t mmu, pmap_t pmap, vm_offset_t addr, 2766 vm_object_t object, vm_pindex_t pindex, vm_size_t size) 2767{ 2768 2769 VM_OBJECT_ASSERT_WLOCKED(object); 2770 KASSERT(object->type == OBJT_DEVICE || object->type == OBJT_SG, 2771 ("mmu_booke_object_init_pt: non-device object")); 2772} 2773 2774/* 2775 * Perform the pmap work for mincore. 2776 */ 2777static int 2778mmu_booke_mincore(mmu_t mmu, pmap_t pmap, vm_offset_t addr, 2779 vm_paddr_t *locked_pa) 2780{ 2781 2782 /* XXX: this should be implemented at some point */ 2783 return (0); 2784} 2785 2786/**************************************************************************/ 2787/* TID handling */ 2788/**************************************************************************/ 2789 2790/* 2791 * Allocate a TID. If necessary, steal one from someone else. 2792 * The new TID is flushed from the TLB before returning. 2793 */ 2794static tlbtid_t 2795tid_alloc(pmap_t pmap) 2796{ 2797 tlbtid_t tid; 2798 int thiscpu; 2799 2800 KASSERT((pmap != kernel_pmap), ("tid_alloc: kernel pmap")); 2801 2802 CTR2(KTR_PMAP, "%s: s (pmap = %p)", __func__, pmap); 2803 2804 thiscpu = PCPU_GET(cpuid); 2805 2806 tid = PCPU_GET(tid_next); 2807 if (tid > TID_MAX) 2808 tid = TID_MIN; 2809 PCPU_SET(tid_next, tid + 1); 2810 2811 /* If we are stealing TID then clear the relevant pmap's field */ 2812 if (tidbusy[thiscpu][tid] != NULL) { 2813 2814 CTR2(KTR_PMAP, "%s: warning: stealing tid %d", __func__, tid); 2815 2816 tidbusy[thiscpu][tid]->pm_tid[thiscpu] = TID_NONE; 2817 2818 /* Flush all entries from TLB0 matching this TID. */ 2819 tid_flush(tid); 2820 } 2821 2822 tidbusy[thiscpu][tid] = pmap; 2823 pmap->pm_tid[thiscpu] = tid; 2824 __asm __volatile("msync; isync"); 2825 2826 CTR3(KTR_PMAP, "%s: e (%02d next = %02d)", __func__, tid, 2827 PCPU_GET(tid_next)); 2828 2829 return (tid); 2830} 2831 2832/**************************************************************************/ 2833/* TLB0 handling */ 2834/**************************************************************************/ 2835 2836static void 2837tlb_print_entry(int i, uint32_t mas1, uint32_t mas2, uint32_t mas3, 2838 uint32_t mas7) 2839{ 2840 int as; 2841 char desc[3]; 2842 tlbtid_t tid; 2843 vm_size_t size; 2844 unsigned int tsize; 2845 2846 desc[2] = '\0'; 2847 if (mas1 & MAS1_VALID) 2848 desc[0] = 'V'; 2849 else 2850 desc[0] = ' '; 2851 2852 if (mas1 & MAS1_IPROT) 2853 desc[1] = 'P'; 2854 else 2855 desc[1] = ' '; 2856 2857 as = (mas1 & MAS1_TS_MASK) ? 1 : 0; 2858 tid = MAS1_GETTID(mas1); 2859 2860 tsize = (mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT; 2861 size = 0; 2862 if (tsize) 2863 size = tsize2size(tsize); 2864 2865 debugf("%3d: (%s) [AS=%d] " 2866 "sz = 0x%08x tsz = %d tid = %d mas1 = 0x%08x " 2867 "mas2(va) = 0x%08x mas3(pa) = 0x%08x mas7 = 0x%08x\n", 2868 i, desc, as, size, tsize, tid, mas1, mas2, mas3, mas7); 2869} 2870 2871/* Convert TLB0 va and way number to tlb0[] table index. */ 2872static inline unsigned int 2873tlb0_tableidx(vm_offset_t va, unsigned int way) 2874{ 2875 unsigned int idx; 2876 2877 idx = (way * TLB0_ENTRIES_PER_WAY); 2878 idx += (va & MAS2_TLB0_ENTRY_IDX_MASK) >> MAS2_TLB0_ENTRY_IDX_SHIFT; 2879 return (idx); 2880} 2881 2882/* 2883 * Invalidate TLB0 entry. 2884 */ 2885static inline void 2886tlb0_flush_entry(vm_offset_t va) 2887{ 2888 2889 CTR2(KTR_PMAP, "%s: s va=0x%08x", __func__, va); 2890 2891 mtx_assert(&tlbivax_mutex, MA_OWNED); 2892 2893 __asm __volatile("tlbivax 0, %0" :: "r"(va & MAS2_EPN_MASK)); 2894 __asm __volatile("isync; msync"); 2895 __asm __volatile("tlbsync; msync"); 2896 2897 CTR1(KTR_PMAP, "%s: e", __func__); 2898} 2899 2900/* Print out contents of the MAS registers for each TLB0 entry */ 2901void 2902tlb0_print_tlbentries(void) 2903{ 2904 uint32_t mas0, mas1, mas2, mas3, mas7; 2905 int entryidx, way, idx; 2906 2907 debugf("TLB0 entries:\n"); 2908 for (way = 0; way < TLB0_WAYS; way ++) 2909 for (entryidx = 0; entryidx < TLB0_ENTRIES_PER_WAY; entryidx++) { 2910 2911 mas0 = MAS0_TLBSEL(0) | MAS0_ESEL(way); 2912 mtspr(SPR_MAS0, mas0); 2913 __asm __volatile("isync"); 2914 2915 mas2 = entryidx << MAS2_TLB0_ENTRY_IDX_SHIFT; 2916 mtspr(SPR_MAS2, mas2); 2917 2918 __asm __volatile("isync; tlbre"); 2919 2920 mas1 = mfspr(SPR_MAS1); 2921 mas2 = mfspr(SPR_MAS2); 2922 mas3 = mfspr(SPR_MAS3); 2923 mas7 = mfspr(SPR_MAS7); 2924 2925 idx = tlb0_tableidx(mas2, way); 2926 tlb_print_entry(idx, mas1, mas2, mas3, mas7); 2927 } 2928} 2929 2930/**************************************************************************/ 2931/* TLB1 handling */ 2932/**************************************************************************/ 2933 2934/* 2935 * TLB1 mapping notes: 2936 * 2937 * TLB1[0] Kernel text and data. 2938 * TLB1[1-15] Additional kernel text and data mappings (if required), PCI 2939 * windows, other devices mappings. 2940 */ 2941 2942/* 2943 * Write given entry to TLB1 hardware. 2944 * Use 32 bit pa, clear 4 high-order bits of RPN (mas7). 2945 */ 2946static void 2947tlb1_write_entry(unsigned int idx) 2948{ 2949 uint32_t mas0, mas7; 2950 2951 //debugf("tlb1_write_entry: s\n"); 2952 2953 /* Clear high order RPN bits */ 2954 mas7 = 0; 2955 2956 /* Select entry */ 2957 mas0 = MAS0_TLBSEL(1) | MAS0_ESEL(idx); 2958 //debugf("tlb1_write_entry: mas0 = 0x%08x\n", mas0); 2959 2960 mtspr(SPR_MAS0, mas0); 2961 __asm __volatile("isync"); 2962 mtspr(SPR_MAS1, tlb1[idx].mas1); 2963 __asm __volatile("isync"); 2964 mtspr(SPR_MAS2, tlb1[idx].mas2); 2965 __asm __volatile("isync"); 2966 mtspr(SPR_MAS3, tlb1[idx].mas3); 2967 __asm __volatile("isync"); 2968 mtspr(SPR_MAS7, mas7); 2969 __asm __volatile("isync; tlbwe; isync; msync"); 2970 2971 //debugf("tlb1_write_entry: e\n"); 2972} 2973 2974/* 2975 * Return the largest uint value log such that 2^log <= num. 2976 */ 2977static unsigned int 2978ilog2(unsigned int num) 2979{ 2980 int lz; 2981 2982 __asm ("cntlzw %0, %1" : "=r" (lz) : "r" (num)); 2983 return (31 - lz); 2984} 2985 2986/* 2987 * Convert TLB TSIZE value to mapped region size. 2988 */ 2989static vm_size_t 2990tsize2size(unsigned int tsize) 2991{ 2992 2993 /* 2994 * size = 4^tsize KB 2995 * size = 4^tsize * 2^10 = 2^(2 * tsize - 10) 2996 */ 2997 2998 return ((1 << (2 * tsize)) * 1024); 2999} 3000 3001/* 3002 * Convert region size (must be power of 4) to TLB TSIZE value. 3003 */ 3004static unsigned int 3005size2tsize(vm_size_t size) 3006{ 3007 3008 return (ilog2(size) / 2 - 5); 3009} 3010 3011/* 3012 * Register permanent kernel mapping in TLB1. 3013 * 3014 * Entries are created starting from index 0 (current free entry is 3015 * kept in tlb1_idx) and are not supposed to be invalidated. 3016 */ 3017static int 3018tlb1_set_entry(vm_offset_t va, vm_offset_t pa, vm_size_t size, 3019 uint32_t flags) 3020{ 3021 uint32_t ts, tid; 3022 int tsize, index; 3023 3024 index = atomic_fetchadd_int(&tlb1_idx, 1); 3025 if (index >= TLB1_ENTRIES) { 3026 printf("tlb1_set_entry: TLB1 full!\n"); 3027 return (-1); 3028 } 3029 3030 /* Convert size to TSIZE */ 3031 tsize = size2tsize(size); 3032 3033 tid = (TID_KERNEL << MAS1_TID_SHIFT) & MAS1_TID_MASK; 3034 /* XXX TS is hard coded to 0 for now as we only use single address space */ 3035 ts = (0 << MAS1_TS_SHIFT) & MAS1_TS_MASK; 3036 3037 /* 3038 * Atomicity is preserved by the atomic increment above since nothing 3039 * is ever removed from tlb1. 3040 */ 3041 3042 tlb1[index].phys = pa; 3043 tlb1[index].virt = va; 3044 tlb1[index].size = size; 3045 tlb1[index].mas1 = MAS1_VALID | MAS1_IPROT | ts | tid; 3046 tlb1[index].mas1 |= ((tsize << MAS1_TSIZE_SHIFT) & MAS1_TSIZE_MASK); 3047 tlb1[index].mas2 = (va & MAS2_EPN_MASK) | flags; 3048 3049 /* Set supervisor RWX permission bits */ 3050 tlb1[index].mas3 = (pa & MAS3_RPN) | MAS3_SR | MAS3_SW | MAS3_SX; 3051 3052 tlb1_write_entry(index); 3053 3054 /* 3055 * XXX in general TLB1 updates should be propagated between CPUs, 3056 * since current design assumes to have the same TLB1 set-up on all 3057 * cores. 3058 */ 3059 return (0); 3060} 3061 3062/* 3063 * Map in contiguous RAM region into the TLB1 using maximum of 3064 * KERNEL_REGION_MAX_TLB_ENTRIES entries. 3065 * 3066 * If necessary round up last entry size and return total size 3067 * used by all allocated entries. 3068 */ 3069vm_size_t 3070tlb1_mapin_region(vm_offset_t va, vm_paddr_t pa, vm_size_t size) 3071{ 3072 vm_size_t pgs[KERNEL_REGION_MAX_TLB_ENTRIES]; 3073 vm_size_t mapped, pgsz, base, mask; 3074 int idx, nents; 3075 3076 /* Round up to the next 1M */ 3077 size = (size + (1 << 20) - 1) & ~((1 << 20) - 1); 3078 3079 mapped = 0; 3080 idx = 0; 3081 base = va; 3082 pgsz = 64*1024*1024; 3083 while (mapped < size) { 3084 while (mapped < size && idx < KERNEL_REGION_MAX_TLB_ENTRIES) { 3085 while (pgsz > (size - mapped)) 3086 pgsz >>= 2; 3087 pgs[idx++] = pgsz; 3088 mapped += pgsz; 3089 } 3090 3091 /* We under-map. Correct for this. */ 3092 if (mapped < size) { 3093 while (pgs[idx - 1] == pgsz) { 3094 idx--; 3095 mapped -= pgsz; 3096 } 3097 /* XXX We may increase beyond out starting point. */ 3098 pgsz <<= 2; 3099 pgs[idx++] = pgsz; 3100 mapped += pgsz; 3101 } 3102 } 3103 3104 nents = idx; 3105 mask = pgs[0] - 1; 3106 /* Align address to the boundary */ 3107 if (va & mask) { 3108 va = (va + mask) & ~mask; 3109 pa = (pa + mask) & ~mask; 3110 } 3111 3112 for (idx = 0; idx < nents; idx++) { 3113 pgsz = pgs[idx]; 3114 debugf("%u: %x -> %x, size=%x\n", idx, pa, va, pgsz); 3115 tlb1_set_entry(va, pa, pgsz, _TLB_ENTRY_MEM); 3116 pa += pgsz; 3117 va += pgsz; 3118 } 3119 3120 mapped = (va - base); 3121 printf("mapped size 0x%08x (wasted space 0x%08x)\n", 3122 mapped, mapped - size); 3123 return (mapped); 3124} 3125 3126/* 3127 * TLB1 initialization routine, to be called after the very first 3128 * assembler level setup done in locore.S. 3129 */ 3130void 3131tlb1_init() 3132{ 3133 uint32_t mas0, mas1, mas2, mas3; 3134 uint32_t tsz; 3135 u_int i; 3136 3137 if (bootinfo != NULL && bootinfo[0] != 1) { 3138 tlb1_idx = *((uint16_t *)(bootinfo + 8)); 3139 } else 3140 tlb1_idx = 1; 3141 3142 /* The first entry/entries are used to map the kernel. */ 3143 for (i = 0; i < tlb1_idx; i++) { 3144 mas0 = MAS0_TLBSEL(1) | MAS0_ESEL(i); 3145 mtspr(SPR_MAS0, mas0); 3146 __asm __volatile("isync; tlbre"); 3147 3148 mas1 = mfspr(SPR_MAS1); 3149 if ((mas1 & MAS1_VALID) == 0) 3150 continue; 3151 3152 mas2 = mfspr(SPR_MAS2); 3153 mas3 = mfspr(SPR_MAS3); 3154 3155 tlb1[i].mas1 = mas1; 3156 tlb1[i].mas2 = mfspr(SPR_MAS2); 3157 tlb1[i].mas3 = mas3; 3158 tlb1[i].virt = mas2 & MAS2_EPN_MASK; 3159 tlb1[i].phys = mas3 & MAS3_RPN; 3160 3161 if (i == 0) 3162 kernload = mas3 & MAS3_RPN; 3163 3164 tsz = (mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT; 3165 tlb1[i].size = (tsz > 0) ? tsize2size(tsz) : 0; 3166 kernsize += tlb1[i].size; 3167 } 3168 3169#ifdef SMP 3170 bp_ntlb1s = tlb1_idx; 3171#endif 3172 3173 /* Purge the remaining entries */ 3174 for (i = tlb1_idx; i < TLB1_ENTRIES; i++) 3175 tlb1_write_entry(i); 3176 3177 /* Setup TLB miss defaults */ 3178 set_mas4_defaults(); 3179} 3180 3181vm_offset_t 3182pmap_early_io_map(vm_paddr_t pa, vm_size_t size) 3183{ 3184 vm_paddr_t pa_base; 3185 vm_offset_t va, sz; 3186 int i; 3187 3188 KASSERT(!pmap_bootstrapped, ("Do not use after PMAP is up!")); 3189 3190 for (i = 0; i < tlb1_idx; i++) { 3191 if (!(tlb1[i].mas1 & MAS1_VALID)) 3192 continue; 3193 if (pa >= tlb1[i].phys && (pa + size) <= 3194 (tlb1[i].phys + tlb1[i].size)) 3195 return (tlb1[i].virt + (pa - tlb1[i].phys)); 3196 } 3197 3198 pa_base = trunc_page(pa); 3199 size = roundup(size + (pa - pa_base), PAGE_SIZE); 3200 tlb1_map_base = roundup2(tlb1_map_base, 1 << (ilog2(size) & ~1)); 3201 va = tlb1_map_base + (pa - pa_base); 3202 3203 do { 3204 sz = 1 << (ilog2(size) & ~1); 3205 tlb1_set_entry(tlb1_map_base, pa_base, sz, _TLB_ENTRY_IO); 3206 size -= sz; 3207 pa_base += sz; 3208 tlb1_map_base += sz; 3209 } while (size > 0); 3210 3211#ifdef SMP 3212 bp_ntlb1s = tlb1_idx; 3213#endif 3214 3215 return (va); 3216} 3217 3218/* 3219 * Setup MAS4 defaults. 3220 * These values are loaded to MAS0-2 on a TLB miss. 3221 */ 3222static void 3223set_mas4_defaults(void) 3224{ 3225 uint32_t mas4; 3226 3227 /* Defaults: TLB0, PID0, TSIZED=4K */ 3228 mas4 = MAS4_TLBSELD0; 3229 mas4 |= (TLB_SIZE_4K << MAS4_TSIZED_SHIFT) & MAS4_TSIZED_MASK; 3230#ifdef SMP 3231 mas4 |= MAS4_MD; 3232#endif 3233 mtspr(SPR_MAS4, mas4); 3234 __asm __volatile("isync"); 3235} 3236 3237/* 3238 * Print out contents of the MAS registers for each TLB1 entry 3239 */ 3240void 3241tlb1_print_tlbentries(void) 3242{ 3243 uint32_t mas0, mas1, mas2, mas3, mas7; 3244 int i; 3245 3246 debugf("TLB1 entries:\n"); 3247 for (i = 0; i < TLB1_ENTRIES; i++) { 3248 3249 mas0 = MAS0_TLBSEL(1) | MAS0_ESEL(i); 3250 mtspr(SPR_MAS0, mas0); 3251 3252 __asm __volatile("isync; tlbre"); 3253 3254 mas1 = mfspr(SPR_MAS1); 3255 mas2 = mfspr(SPR_MAS2); 3256 mas3 = mfspr(SPR_MAS3); 3257 mas7 = mfspr(SPR_MAS7); 3258 3259 tlb_print_entry(i, mas1, mas2, mas3, mas7); 3260 } 3261} 3262 3263/* 3264 * Print out contents of the in-ram tlb1 table. 3265 */ 3266void 3267tlb1_print_entries(void) 3268{ 3269 int i; 3270 3271 debugf("tlb1[] table entries:\n"); 3272 for (i = 0; i < TLB1_ENTRIES; i++) 3273 tlb_print_entry(i, tlb1[i].mas1, tlb1[i].mas2, tlb1[i].mas3, 0); 3274} 3275 3276/* 3277 * Return 0 if the physical IO range is encompassed by one of the 3278 * the TLB1 entries, otherwise return related error code. 3279 */ 3280static int 3281tlb1_iomapped(int i, vm_paddr_t pa, vm_size_t size, vm_offset_t *va) 3282{ 3283 uint32_t prot; 3284 vm_paddr_t pa_start; 3285 vm_paddr_t pa_end; 3286 unsigned int entry_tsize; 3287 vm_size_t entry_size; 3288 3289 *va = (vm_offset_t)NULL; 3290 3291 /* Skip invalid entries */ 3292 if (!(tlb1[i].mas1 & MAS1_VALID)) 3293 return (EINVAL); 3294 3295 /* 3296 * The entry must be cache-inhibited, guarded, and r/w 3297 * so it can function as an i/o page 3298 */ 3299 prot = tlb1[i].mas2 & (MAS2_I | MAS2_G); 3300 if (prot != (MAS2_I | MAS2_G)) 3301 return (EPERM); 3302 3303 prot = tlb1[i].mas3 & (MAS3_SR | MAS3_SW); 3304 if (prot != (MAS3_SR | MAS3_SW)) 3305 return (EPERM); 3306 3307 /* The address should be within the entry range. */ 3308 entry_tsize = (tlb1[i].mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT; 3309 KASSERT((entry_tsize), ("tlb1_iomapped: invalid entry tsize")); 3310 3311 entry_size = tsize2size(entry_tsize); 3312 pa_start = tlb1[i].mas3 & MAS3_RPN; 3313 pa_end = pa_start + entry_size - 1; 3314 3315 if ((pa < pa_start) || ((pa + size) > pa_end)) 3316 return (ERANGE); 3317 3318 /* Return virtual address of this mapping. */ 3319 *va = (tlb1[i].mas2 & MAS2_EPN_MASK) + (pa - pa_start); 3320 return (0); 3321} 3322