1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * PowerPC version 4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 5 * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP 6 * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> 7 * Adapted for Power Macintosh by Paul Mackerras. 8 * Low-level exception handlers and MMU support 9 * rewritten by Paul Mackerras. 10 * Copyright (C) 1996 Paul Mackerras. 11 * 12 * This file contains low-level assembler routines for managing 13 * the PowerPC MMU hash table. (PPC 8xx processors don't use a 14 * hash table, so this file is not used on them.) 15 */ 16 17#include <linux/pgtable.h> 18#include <asm/reg.h> 19#include <asm/page.h> 20#include <asm/cputable.h> 21#include <asm/ppc_asm.h> 22#include <asm/thread_info.h> 23#include <asm/asm-offsets.h> 24#include <asm/export.h> 25#include <asm/feature-fixups.h> 26#include <asm/code-patching-asm.h> 27 28#ifdef CONFIG_SMP 29 .section .bss 30 .align 2 31mmu_hash_lock: 32 .space 4 33#endif /* CONFIG_SMP */ 34 35/* 36 * Load a PTE into the hash table, if possible. 37 * The address is in r4, and r3 contains an access flag: 38 * _PAGE_RW (0x400) if a write. 39 * r9 contains the SRR1 value, from which we use the MSR_PR bit. 40 * SPRG_THREAD contains the physical address of the current task's thread. 41 * 42 * Returns to the caller if the access is illegal or there is no 43 * mapping for the address. Otherwise it places an appropriate PTE 44 * in the hash table and returns from the exception. 45 * Uses r0, r3 - r6, r8, r10, ctr, lr. 46 */ 47 .text 48_GLOBAL(hash_page) 49#ifdef CONFIG_SMP 50 lis r8, (mmu_hash_lock - PAGE_OFFSET)@h 51 ori r8, r8, (mmu_hash_lock - PAGE_OFFSET)@l 52 lis r0,0x0fff 53 b 10f 5411: lwz r6,0(r8) 55 cmpwi 0,r6,0 56 bne 11b 5710: lwarx r6,0,r8 58 cmpwi 0,r6,0 59 bne- 11b 60 stwcx. r0,0,r8 61 bne- 10b 62 isync 63#endif 64 /* Get PTE (linux-style) and check access */ 65 lis r0,KERNELBASE@h /* check if kernel address */ 66 cmplw 0,r4,r0 67 ori r3,r3,_PAGE_USER|_PAGE_PRESENT /* test low addresses as user */ 68 mfspr r5, SPRN_SPRG_PGDIR /* phys page-table root */ 69 blt+ 112f /* assume user more likely */ 70 lis r5, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ 71 addi r5 ,r5 ,(swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */ 72 rlwimi r3,r9,32-12,29,29 /* MSR_PR -> _PAGE_USER */ 73112: 74#ifndef CONFIG_PTE_64BIT 75 rlwimi r5,r4,12,20,29 /* insert top 10 bits of address */ 76 lwz r8,0(r5) /* get pmd entry */ 77 rlwinm. r8,r8,0,0,19 /* extract address of pte page */ 78#else 79 rlwinm r8,r4,13,19,29 /* Compute pgdir/pmd offset */ 80 lwzx r8,r8,r5 /* Get L1 entry */ 81 rlwinm. r8,r8,0,0,20 /* extract pt base address */ 82#endif 83#ifdef CONFIG_SMP 84 beq- .Lhash_page_out /* return if no mapping */ 85#else 86 /* XXX it seems like the 601 will give a machine fault on the 87 rfi if its alignment is wrong (bottom 4 bits of address are 88 8 or 0xc) and we have had a not-taken conditional branch 89 to the address following the rfi. */ 90 beqlr- 91#endif 92#ifndef CONFIG_PTE_64BIT 93 rlwimi r8,r4,22,20,29 /* insert next 10 bits of address */ 94#else 95 rlwimi r8,r4,23,20,28 /* compute pte address */ 96#endif 97 rlwinm r0,r3,32-3,24,24 /* _PAGE_RW access -> _PAGE_DIRTY */ 98 ori r0,r0,_PAGE_ACCESSED|_PAGE_HASHPTE 99 100 /* 101 * Update the linux PTE atomically. We do the lwarx up-front 102 * because almost always, there won't be a permission violation 103 * and there won't already be an HPTE, and thus we will have 104 * to update the PTE to set _PAGE_HASHPTE. -- paulus. 105 * 106 * If PTE_64BIT is set, the low word is the flags word; use that 107 * word for locking since it contains all the interesting bits. 108 */ 109#if (PTE_FLAGS_OFFSET != 0) 110 addi r8,r8,PTE_FLAGS_OFFSET 111#endif 112.Lretry: 113 lwarx r6,0,r8 /* get linux-style pte, flag word */ 114 andc. r5,r3,r6 /* check access & ~permission */ 115#ifdef CONFIG_SMP 116 bne- .Lhash_page_out /* return if access not permitted */ 117#else 118 bnelr- 119#endif 120 or r5,r0,r6 /* set accessed/dirty bits */ 121#ifdef CONFIG_PTE_64BIT 122#ifdef CONFIG_SMP 123 subf r10,r6,r8 /* create false data dependency */ 124 subi r10,r10,PTE_FLAGS_OFFSET 125 lwzx r10,r6,r10 /* Get upper PTE word */ 126#else 127 lwz r10,-PTE_FLAGS_OFFSET(r8) 128#endif /* CONFIG_SMP */ 129#endif /* CONFIG_PTE_64BIT */ 130 stwcx. r5,0,r8 /* attempt to update PTE */ 131 bne- .Lretry /* retry if someone got there first */ 132 133 mfsrin r3,r4 /* get segment reg for segment */ 134#ifndef CONFIG_VMAP_STACK 135 mfctr r0 136 stw r0,_CTR(r11) 137#endif 138 bl create_hpte /* add the hash table entry */ 139 140#ifdef CONFIG_SMP 141 eieio 142 lis r8, (mmu_hash_lock - PAGE_OFFSET)@ha 143 li r0,0 144 stw r0, (mmu_hash_lock - PAGE_OFFSET)@l(r8) 145#endif 146 147#ifdef CONFIG_VMAP_STACK 148 b fast_hash_page_return 149#else 150 /* Return from the exception */ 151 lwz r5,_CTR(r11) 152 mtctr r5 153 lwz r0,GPR0(r11) 154 lwz r8,GPR8(r11) 155 b fast_exception_return 156#endif 157 158#ifdef CONFIG_SMP 159.Lhash_page_out: 160 eieio 161 lis r8, (mmu_hash_lock - PAGE_OFFSET)@ha 162 li r0,0 163 stw r0, (mmu_hash_lock - PAGE_OFFSET)@l(r8) 164 blr 165#endif /* CONFIG_SMP */ 166_ASM_NOKPROBE_SYMBOL(hash_page) 167 168/* 169 * Add an entry for a particular page to the hash table. 170 * 171 * add_hash_page(unsigned context, unsigned long va, unsigned long pmdval) 172 * 173 * We assume any necessary modifications to the pte (e.g. setting 174 * the accessed bit) have already been done and that there is actually 175 * a hash table in use (i.e. we're not on a 603). 176 */ 177_GLOBAL(add_hash_page) 178 mflr r0 179 stw r0,4(r1) 180 181 /* Convert context and va to VSID */ 182 mulli r3,r3,897*16 /* multiply context by context skew */ 183 rlwinm r0,r4,4,28,31 /* get ESID (top 4 bits of va) */ 184 mulli r0,r0,0x111 /* multiply by ESID skew */ 185 add r3,r3,r0 /* note create_hpte trims to 24 bits */ 186 187#ifdef CONFIG_SMP 188 lwz r8,TASK_CPU(r2) /* to go in mmu_hash_lock */ 189 oris r8,r8,12 190#endif /* CONFIG_SMP */ 191 192 /* 193 * We disable interrupts here, even on UP, because we don't 194 * want to race with hash_page, and because we want the 195 * _PAGE_HASHPTE bit to be a reliable indication of whether 196 * the HPTE exists (or at least whether one did once). 197 * We also turn off the MMU for data accesses so that we 198 * we can't take a hash table miss (assuming the code is 199 * covered by a BAT). -- paulus 200 */ 201 mfmsr r9 202 SYNC 203 rlwinm r0,r9,0,17,15 /* clear bit 16 (MSR_EE) */ 204 rlwinm r0,r0,0,28,26 /* clear MSR_DR */ 205 mtmsr r0 206 SYNC_601 207 isync 208 209#ifdef CONFIG_SMP 210 lis r6, (mmu_hash_lock - PAGE_OFFSET)@ha 211 addi r6, r6, (mmu_hash_lock - PAGE_OFFSET)@l 21210: lwarx r0,0,r6 /* take the mmu_hash_lock */ 213 cmpi 0,r0,0 214 bne- 11f 215 stwcx. r8,0,r6 216 beq+ 12f 21711: lwz r0,0(r6) 218 cmpi 0,r0,0 219 beq 10b 220 b 11b 22112: isync 222#endif 223 224 /* 225 * Fetch the linux pte and test and set _PAGE_HASHPTE atomically. 226 * If _PAGE_HASHPTE was already set, we don't replace the existing 227 * HPTE, so we just unlock and return. 228 */ 229 mr r8,r5 230#ifndef CONFIG_PTE_64BIT 231 rlwimi r8,r4,22,20,29 232#else 233 rlwimi r8,r4,23,20,28 234 addi r8,r8,PTE_FLAGS_OFFSET 235#endif 2361: lwarx r6,0,r8 237 andi. r0,r6,_PAGE_HASHPTE 238 bne 9f /* if HASHPTE already set, done */ 239#ifdef CONFIG_PTE_64BIT 240#ifdef CONFIG_SMP 241 subf r10,r6,r8 /* create false data dependency */ 242 subi r10,r10,PTE_FLAGS_OFFSET 243 lwzx r10,r6,r10 /* Get upper PTE word */ 244#else 245 lwz r10,-PTE_FLAGS_OFFSET(r8) 246#endif /* CONFIG_SMP */ 247#endif /* CONFIG_PTE_64BIT */ 248 ori r5,r6,_PAGE_HASHPTE 249 stwcx. r5,0,r8 250 bne- 1b 251 252 bl create_hpte 253 2549: 255#ifdef CONFIG_SMP 256 lis r6, (mmu_hash_lock - PAGE_OFFSET)@ha 257 addi r6, r6, (mmu_hash_lock - PAGE_OFFSET)@l 258 eieio 259 li r0,0 260 stw r0,0(r6) /* clear mmu_hash_lock */ 261#endif 262 263 /* reenable interrupts and DR */ 264 mtmsr r9 265 SYNC_601 266 isync 267 268 lwz r0,4(r1) 269 mtlr r0 270 blr 271_ASM_NOKPROBE_SYMBOL(add_hash_page) 272 273/* 274 * This routine adds a hardware PTE to the hash table. 275 * It is designed to be called with the MMU either on or off. 276 * r3 contains the VSID, r4 contains the virtual address, 277 * r5 contains the linux PTE, r6 contains the old value of the 278 * linux PTE (before setting _PAGE_HASHPTE). r10 contains the 279 * upper half of the PTE if CONFIG_PTE_64BIT. 280 * On SMP, the caller should have the mmu_hash_lock held. 281 * We assume that the caller has (or will) set the _PAGE_HASHPTE 282 * bit in the linux PTE in memory. The value passed in r6 should 283 * be the old linux PTE value; if it doesn't have _PAGE_HASHPTE set 284 * this routine will skip the search for an existing HPTE. 285 * This procedure modifies r0, r3 - r6, r8, cr0. 286 * -- paulus. 287 * 288 * For speed, 4 of the instructions get patched once the size and 289 * physical address of the hash table are known. These definitions 290 * of Hash_base and Hash_bits below are just an example. 291 */ 292Hash_base = 0xc0180000 293Hash_bits = 12 /* e.g. 256kB hash table */ 294Hash_msk = (((1 << Hash_bits) - 1) * 64) 295 296/* defines for the PTE format for 32-bit PPCs */ 297#define HPTE_SIZE 8 298#define PTEG_SIZE 64 299#define LG_PTEG_SIZE 6 300#define LDPTEu lwzu 301#define LDPTE lwz 302#define STPTE stw 303#define CMPPTE cmpw 304#define PTE_H 0x40 305#define PTE_V 0x80000000 306#define TST_V(r) rlwinm. r,r,0,0,0 307#define SET_V(r) oris r,r,PTE_V@h 308#define CLR_V(r,t) rlwinm r,r,0,1,31 309 310#define HASH_LEFT 31-(LG_PTEG_SIZE+Hash_bits-1) 311#define HASH_RIGHT 31-LG_PTEG_SIZE 312 313_GLOBAL(create_hpte) 314 /* Convert linux-style PTE (r5) to low word of PPC-style PTE (r8) */ 315 rlwinm r8,r5,32-9,30,30 /* _PAGE_RW -> PP msb */ 316 rlwinm r0,r5,32-6,30,30 /* _PAGE_DIRTY -> PP msb */ 317 and r8,r8,r0 /* writable if _RW & _DIRTY */ 318 rlwimi r5,r5,32-1,30,30 /* _PAGE_USER -> PP msb */ 319 rlwimi r5,r5,32-2,31,31 /* _PAGE_USER -> PP lsb */ 320 ori r8,r8,0xe04 /* clear out reserved bits */ 321 andc r8,r5,r8 /* PP = user? (rw&dirty? 1: 3): 0 */ 322BEGIN_FTR_SECTION 323 rlwinm r8,r8,0,~_PAGE_COHERENT /* clear M (coherence not required) */ 324END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT) 325#ifdef CONFIG_PTE_64BIT 326 /* Put the XPN bits into the PTE */ 327 rlwimi r8,r10,8,20,22 328 rlwimi r8,r10,2,29,29 329#endif 330 331 /* Construct the high word of the PPC-style PTE (r5) */ 332 rlwinm r5,r3,7,1,24 /* put VSID in 0x7fffff80 bits */ 333 rlwimi r5,r4,10,26,31 /* put in API (abbrev page index) */ 334 SET_V(r5) /* set V (valid) bit */ 335 336 patch_site 0f, patch__hash_page_A0 337 patch_site 1f, patch__hash_page_A1 338 patch_site 2f, patch__hash_page_A2 339 /* Get the address of the primary PTE group in the hash table (r3) */ 3400: lis r0, (Hash_base - PAGE_OFFSET)@h /* base address of hash table */ 3411: rlwimi r0,r3,LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* VSID -> hash */ 3422: rlwinm r3,r4,20+LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* PI -> hash */ 343 xor r3,r3,r0 /* make primary hash */ 344 li r0,8 /* PTEs/group */ 345 346 /* 347 * Test the _PAGE_HASHPTE bit in the old linux PTE, and skip the search 348 * if it is clear, meaning that the HPTE isn't there already... 349 */ 350 andi. r6,r6,_PAGE_HASHPTE 351 beq+ 10f /* no PTE: go look for an empty slot */ 352 tlbie r4 353 354 lis r4, (htab_hash_searches - PAGE_OFFSET)@ha 355 lwz r6, (htab_hash_searches - PAGE_OFFSET)@l(r4) 356 addi r6,r6,1 /* count how many searches we do */ 357 stw r6, (htab_hash_searches - PAGE_OFFSET)@l(r4) 358 359 /* Search the primary PTEG for a PTE whose 1st (d)word matches r5 */ 360 mtctr r0 361 addi r4,r3,-HPTE_SIZE 3621: LDPTEu r6,HPTE_SIZE(r4) /* get next PTE */ 363 CMPPTE 0,r6,r5 364 bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */ 365 beq+ .Lfound_slot 366 367 patch_site 0f, patch__hash_page_B 368 /* Search the secondary PTEG for a matching PTE */ 369 ori r5,r5,PTE_H /* set H (secondary hash) bit */ 3700: xoris r4,r3,Hash_msk>>16 /* compute secondary hash */ 371 xori r4,r4,(-PTEG_SIZE & 0xffff) 372 addi r4,r4,-HPTE_SIZE 373 mtctr r0 3742: LDPTEu r6,HPTE_SIZE(r4) 375 CMPPTE 0,r6,r5 376 bdnzf 2,2b 377 beq+ .Lfound_slot 378 xori r5,r5,PTE_H /* clear H bit again */ 379 380 /* Search the primary PTEG for an empty slot */ 38110: mtctr r0 382 addi r4,r3,-HPTE_SIZE /* search primary PTEG */ 3831: LDPTEu r6,HPTE_SIZE(r4) /* get next PTE */ 384 TST_V(r6) /* test valid bit */ 385 bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */ 386 beq+ .Lfound_empty 387 388 /* update counter of times that the primary PTEG is full */ 389 lis r4, (primary_pteg_full - PAGE_OFFSET)@ha 390 lwz r6, (primary_pteg_full - PAGE_OFFSET)@l(r4) 391 addi r6,r6,1 392 stw r6, (primary_pteg_full - PAGE_OFFSET)@l(r4) 393 394 patch_site 0f, patch__hash_page_C 395 /* Search the secondary PTEG for an empty slot */ 396 ori r5,r5,PTE_H /* set H (secondary hash) bit */ 3970: xoris r4,r3,Hash_msk>>16 /* compute secondary hash */ 398 xori r4,r4,(-PTEG_SIZE & 0xffff) 399 addi r4,r4,-HPTE_SIZE 400 mtctr r0 4012: LDPTEu r6,HPTE_SIZE(r4) 402 TST_V(r6) 403 bdnzf 2,2b 404 beq+ .Lfound_empty 405 xori r5,r5,PTE_H /* clear H bit again */ 406 407 /* 408 * Choose an arbitrary slot in the primary PTEG to overwrite. 409 * Since both the primary and secondary PTEGs are full, and we 410 * have no information that the PTEs in the primary PTEG are 411 * more important or useful than those in the secondary PTEG, 412 * and we know there is a definite (although small) speed 413 * advantage to putting the PTE in the primary PTEG, we always 414 * put the PTE in the primary PTEG. 415 * 416 * In addition, we skip any slot that is mapping kernel text in 417 * order to avoid a deadlock when not using BAT mappings if 418 * trying to hash in the kernel hash code itself after it has 419 * already taken the hash table lock. This works in conjunction 420 * with pre-faulting of the kernel text. 421 * 422 * If the hash table bucket is full of kernel text entries, we'll 423 * lockup here but that shouldn't happen 424 */ 425 4261: lis r4, (next_slot - PAGE_OFFSET)@ha /* get next evict slot */ 427 lwz r6, (next_slot - PAGE_OFFSET)@l(r4) 428 addi r6,r6,HPTE_SIZE /* search for candidate */ 429 andi. r6,r6,7*HPTE_SIZE 430 stw r6,next_slot@l(r4) 431 add r4,r3,r6 432 LDPTE r0,HPTE_SIZE/2(r4) /* get PTE second word */ 433 clrrwi r0,r0,12 434 lis r6,etext@h 435 ori r6,r6,etext@l /* get etext */ 436 tophys(r6,r6) 437 cmpl cr0,r0,r6 /* compare and try again */ 438 blt 1b 439 440#ifndef CONFIG_SMP 441 /* Store PTE in PTEG */ 442.Lfound_empty: 443 STPTE r5,0(r4) 444.Lfound_slot: 445 STPTE r8,HPTE_SIZE/2(r4) 446 447#else /* CONFIG_SMP */ 448/* 449 * Between the tlbie above and updating the hash table entry below, 450 * another CPU could read the hash table entry and put it in its TLB. 451 * There are 3 cases: 452 * 1. using an empty slot 453 * 2. updating an earlier entry to change permissions (i.e. enable write) 454 * 3. taking over the PTE for an unrelated address 455 * 456 * In each case it doesn't really matter if the other CPUs have the old 457 * PTE in their TLB. So we don't need to bother with another tlbie here, 458 * which is convenient as we've overwritten the register that had the 459 * address. :-) The tlbie above is mainly to make sure that this CPU comes 460 * and gets the new PTE from the hash table. 461 * 462 * We do however have to make sure that the PTE is never in an invalid 463 * state with the V bit set. 464 */ 465.Lfound_empty: 466.Lfound_slot: 467 CLR_V(r5,r0) /* clear V (valid) bit in PTE */ 468 STPTE r5,0(r4) 469 sync 470 TLBSYNC 471 STPTE r8,HPTE_SIZE/2(r4) /* put in correct RPN, WIMG, PP bits */ 472 sync 473 SET_V(r5) 474 STPTE r5,0(r4) /* finally set V bit in PTE */ 475#endif /* CONFIG_SMP */ 476 477 sync /* make sure pte updates get to memory */ 478 blr 479_ASM_NOKPROBE_SYMBOL(create_hpte) 480 481 .section .bss 482 .align 2 483next_slot: 484 .space 4 485primary_pteg_full: 486 .space 4 487htab_hash_searches: 488 .space 4 489 .previous 490 491/* 492 * Flush the entry for a particular page from the hash table. 493 * 494 * flush_hash_pages(unsigned context, unsigned long va, unsigned long pmdval, 495 * int count) 496 * 497 * We assume that there is a hash table in use (Hash != 0). 498 */ 499_GLOBAL(flush_hash_pages) 500 /* 501 * We disable interrupts here, even on UP, because we want 502 * the _PAGE_HASHPTE bit to be a reliable indication of 503 * whether the HPTE exists (or at least whether one did once). 504 * We also turn off the MMU for data accesses so that we 505 * we can't take a hash table miss (assuming the code is 506 * covered by a BAT). -- paulus 507 */ 508 mfmsr r10 509 SYNC 510 rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */ 511 rlwinm r0,r0,0,28,26 /* clear MSR_DR */ 512 mtmsr r0 513 SYNC_601 514 isync 515 516 /* First find a PTE in the range that has _PAGE_HASHPTE set */ 517#ifndef CONFIG_PTE_64BIT 518 rlwimi r5,r4,22,20,29 519#else 520 rlwimi r5,r4,23,20,28 521#endif 5221: lwz r0,PTE_FLAGS_OFFSET(r5) 523 cmpwi cr1,r6,1 524 andi. r0,r0,_PAGE_HASHPTE 525 bne 2f 526 ble cr1,19f 527 addi r4,r4,0x1000 528 addi r5,r5,PTE_SIZE 529 addi r6,r6,-1 530 b 1b 531 532 /* Convert context and va to VSID */ 5332: mulli r3,r3,897*16 /* multiply context by context skew */ 534 rlwinm r0,r4,4,28,31 /* get ESID (top 4 bits of va) */ 535 mulli r0,r0,0x111 /* multiply by ESID skew */ 536 add r3,r3,r0 /* note code below trims to 24 bits */ 537 538 /* Construct the high word of the PPC-style PTE (r11) */ 539 rlwinm r11,r3,7,1,24 /* put VSID in 0x7fffff80 bits */ 540 rlwimi r11,r4,10,26,31 /* put in API (abbrev page index) */ 541 SET_V(r11) /* set V (valid) bit */ 542 543#ifdef CONFIG_SMP 544 lis r9, (mmu_hash_lock - PAGE_OFFSET)@ha 545 addi r9, r9, (mmu_hash_lock - PAGE_OFFSET)@l 546 tophys (r8, r2) 547 lwz r8, TASK_CPU(r8) 548 oris r8,r8,9 54910: lwarx r0,0,r9 550 cmpi 0,r0,0 551 bne- 11f 552 stwcx. r8,0,r9 553 beq+ 12f 55411: lwz r0,0(r9) 555 cmpi 0,r0,0 556 beq 10b 557 b 11b 55812: isync 559#endif 560 561 /* 562 * Check the _PAGE_HASHPTE bit in the linux PTE. If it is 563 * already clear, we're done (for this pte). If not, 564 * clear it (atomically) and proceed. -- paulus. 565 */ 566#if (PTE_FLAGS_OFFSET != 0) 567 addi r5,r5,PTE_FLAGS_OFFSET 568#endif 56933: lwarx r8,0,r5 /* fetch the pte flags word */ 570 andi. r0,r8,_PAGE_HASHPTE 571 beq 8f /* done if HASHPTE is already clear */ 572 rlwinm r8,r8,0,31,29 /* clear HASHPTE bit */ 573 stwcx. r8,0,r5 /* update the pte */ 574 bne- 33b 575 576 patch_site 0f, patch__flush_hash_A0 577 patch_site 1f, patch__flush_hash_A1 578 patch_site 2f, patch__flush_hash_A2 579 /* Get the address of the primary PTE group in the hash table (r3) */ 5800: lis r8, (Hash_base - PAGE_OFFSET)@h /* base address of hash table */ 5811: rlwimi r8,r3,LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* VSID -> hash */ 5822: rlwinm r0,r4,20+LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* PI -> hash */ 583 xor r8,r0,r8 /* make primary hash */ 584 585 /* Search the primary PTEG for a PTE whose 1st (d)word matches r5 */ 586 li r0,8 /* PTEs/group */ 587 mtctr r0 588 addi r12,r8,-HPTE_SIZE 5891: LDPTEu r0,HPTE_SIZE(r12) /* get next PTE */ 590 CMPPTE 0,r0,r11 591 bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */ 592 beq+ 3f 593 594 patch_site 0f, patch__flush_hash_B 595 /* Search the secondary PTEG for a matching PTE */ 596 ori r11,r11,PTE_H /* set H (secondary hash) bit */ 597 li r0,8 /* PTEs/group */ 5980: xoris r12,r8,Hash_msk>>16 /* compute secondary hash */ 599 xori r12,r12,(-PTEG_SIZE & 0xffff) 600 addi r12,r12,-HPTE_SIZE 601 mtctr r0 6022: LDPTEu r0,HPTE_SIZE(r12) 603 CMPPTE 0,r0,r11 604 bdnzf 2,2b 605 xori r11,r11,PTE_H /* clear H again */ 606 bne- 4f /* should rarely fail to find it */ 607 6083: li r0,0 609 STPTE r0,0(r12) /* invalidate entry */ 6104: sync 611 tlbie r4 /* in hw tlb too */ 612 sync 613 6148: ble cr1,9f /* if all ptes checked */ 61581: addi r6,r6,-1 616 addi r5,r5,PTE_SIZE 617 addi r4,r4,0x1000 618 lwz r0,0(r5) /* check next pte */ 619 cmpwi cr1,r6,1 620 andi. r0,r0,_PAGE_HASHPTE 621 bne 33b 622 bgt cr1,81b 623 6249: 625#ifdef CONFIG_SMP 626 TLBSYNC 627 li r0,0 628 stw r0,0(r9) /* clear mmu_hash_lock */ 629#endif 630 63119: mtmsr r10 632 SYNC_601 633 isync 634 blr 635EXPORT_SYMBOL(flush_hash_pages) 636_ASM_NOKPROBE_SYMBOL(flush_hash_pages) 637 638/* 639 * Flush an entry from the TLB 640 */ 641_GLOBAL(_tlbie) 642#ifdef CONFIG_SMP 643 lwz r8,TASK_CPU(r2) 644 oris r8,r8,11 645 mfmsr r10 646 SYNC 647 rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */ 648 rlwinm r0,r0,0,28,26 /* clear DR */ 649 mtmsr r0 650 SYNC_601 651 isync 652 lis r9,mmu_hash_lock@h 653 ori r9,r9,mmu_hash_lock@l 654 tophys(r9,r9) 65510: lwarx r7,0,r9 656 cmpwi 0,r7,0 657 bne- 10b 658 stwcx. r8,0,r9 659 bne- 10b 660 eieio 661 tlbie r3 662 sync 663 TLBSYNC 664 li r0,0 665 stw r0,0(r9) /* clear mmu_hash_lock */ 666 mtmsr r10 667 SYNC_601 668 isync 669#else /* CONFIG_SMP */ 670 tlbie r3 671 sync 672#endif /* CONFIG_SMP */ 673 blr 674_ASM_NOKPROBE_SYMBOL(_tlbie) 675 676/* 677 * Flush the entire TLB. 603/603e only 678 */ 679_GLOBAL(_tlbia) 680#if defined(CONFIG_SMP) 681 lwz r8,TASK_CPU(r2) 682 oris r8,r8,10 683 mfmsr r10 684 SYNC 685 rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */ 686 rlwinm r0,r0,0,28,26 /* clear DR */ 687 mtmsr r0 688 SYNC_601 689 isync 690 lis r9,mmu_hash_lock@h 691 ori r9,r9,mmu_hash_lock@l 692 tophys(r9,r9) 69310: lwarx r7,0,r9 694 cmpwi 0,r7,0 695 bne- 10b 696 stwcx. r8,0,r9 697 bne- 10b 698#endif /* CONFIG_SMP */ 699 li r5, 32 700 lis r4, KERNELBASE@h 701 mtctr r5 702 sync 7030: tlbie r4 704 addi r4, r4, 0x1000 705 bdnz 0b 706 sync 707#ifdef CONFIG_SMP 708 TLBSYNC 709 li r0,0 710 stw r0,0(r9) /* clear mmu_hash_lock */ 711 mtmsr r10 712 SYNC_601 713 isync 714#endif /* CONFIG_SMP */ 715 blr 716_ASM_NOKPROBE_SYMBOL(_tlbia) 717