target-ppc/mmu-hash64.c

   1 /*
   2  *  PowerPC MMU, TLB, SLB and BAT emulation helpers for QEMU.
   3  *
   4  *  Copyright (c) 2003-2007 Jocelyn Mayer
   5  *  Copyright (c) 2013 David Gibson, IBM Corporation
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20 #include "cpu.h"
  21 #include "helper.h"
  22 #include "sysemu/kvm.h"
  23 #include "kvm_ppc.h"
  24 #include "mmu-hash64.h"
  25
  26 //#define DEBUG_MMU
  27 //#define DEBUG_SLB
  28
  29 #ifdef DEBUG_MMU
  30 #  define LOG_MMU(...) qemu_log(__VA_ARGS__)
  31 #  define LOG_MMU_STATE(cpu) log_cpu_state((cpu), 0)
  32 #else
  33 #  define LOG_MMU(...) do { } while (0)
  34 #  define LOG_MMU_STATE(cpu) do { } while (0)
  35 #endif
  36
  37 #ifdef DEBUG_SLB
  38 #  define LOG_SLB(...) qemu_log(__VA_ARGS__)
  39 #else
  40 #  define LOG_SLB(...) do { } while (0)
  41 #endif
  42
  43 /*
  44  * Used to indicate whether we have allocated htab in the
  45  * host kernel
  46  */
  47 bool kvmppc_kern_htab;
  48 /*
  49  * SLB handling
  50  */
  51
  52 static ppc_slb_t *slb_lookup(CPUPPCState *env, target_ulong eaddr)
  53 {
  54     uint64_t esid_256M, esid_1T;
  55     int n;
  56
  57     LOG_SLB("%s: eaddr " TARGET_FMT_lx "\n", __func__, eaddr);
  58
  59     esid_256M = (eaddr & SEGMENT_MASK_256M) | SLB_ESID_V;
  60     esid_1T = (eaddr & SEGMENT_MASK_1T) | SLB_ESID_V;
  61
  62     for (n = 0; n < env->slb_nr; n++) {
  63         ppc_slb_t *slb = &env->slb[n];
  64
  65         LOG_SLB("%s: slot %d %016" PRIx64 " %016"
  66                     PRIx64 "\n", __func__, n, slb->esid, slb->vsid);
  67         /* We check for 1T matches on all MMUs here - if the MMU
  68          * doesn't have 1T segment support, we will have prevented 1T
  69          * entries from being inserted in the slbmte code. */
  70         if (((slb->esid == esid_256M) &&
  71              ((slb->vsid & SLB_VSID_B) == SLB_VSID_B_256M))
  72             || ((slb->esid == esid_1T) &&
  73                 ((slb->vsid & SLB_VSID_B) == SLB_VSID_B_1T))) {
  74             return slb;
  75         }
  76     }
  77
  78     return NULL;
  79 }
  80
  81 void dump_slb(FILE *f, fprintf_function cpu_fprintf, CPUPPCState *env)
  82 {
  83     int i;
  84     uint64_t slbe, slbv;
  85
  86     cpu_synchronize_state(CPU(ppc_env_get_cpu(env)));
  87
  88     cpu_fprintf(f, "SLB\tESID\t\t\tVSID\n");
  89     for (i = 0; i < env->slb_nr; i++) {
  90         slbe = env->slb[i].esid;
  91         slbv = env->slb[i].vsid;
  92         if (slbe == 0 && slbv == 0) {
  93             continue;
  94         }
  95         cpu_fprintf(f, "%d\t0x%016" PRIx64 "\t0x%016" PRIx64 "\n",
  96                     i, slbe, slbv);
  97     }
  98 }
  99
 100 void helper_slbia(CPUPPCState *env)
 101 {
 102     int n, do_invalidate;
 103
 104     do_invalidate = 0;
 105     /* XXX: Warning: slbia never invalidates the first segment */
 106     for (n = 1; n < env->slb_nr; n++) {
 107         ppc_slb_t *slb = &env->slb[n];
 108
 109         if (slb->esid & SLB_ESID_V) {
 110             slb->esid &= ~SLB_ESID_V;
 111             /* XXX: given the fact that segment size is 256 MB or 1TB,
 112              *      and we still don't have a tlb_flush_mask(env, n, mask)
 113              *      in QEMU, we just invalidate all TLBs
 114              */
 115             do_invalidate = 1;
 116         }
 117     }
 118     if (do_invalidate) {
 119         tlb_flush(env, 1);
 120     }
 121 }
 122
 123 void helper_slbie(CPUPPCState *env, target_ulong addr)
 124 {
 125     ppc_slb_t *slb;
 126
 127     slb = slb_lookup(env, addr);
 128     if (!slb) {
 129         return;
 130     }
 131
 132     if (slb->esid & SLB_ESID_V) {
 133         slb->esid &= ~SLB_ESID_V;
 134
 135         /* XXX: given the fact that segment size is 256 MB or 1TB,
 136          *      and we still don't have a tlb_flush_mask(env, n, mask)
 137          *      in QEMU, we just invalidate all TLBs
 138          */
 139         tlb_flush(env, 1);
 140     }
 141 }
 142
 143 int ppc_store_slb(CPUPPCState *env, target_ulong rb, target_ulong rs)
 144 {
 145     int slot = rb & 0xfff;
 146     ppc_slb_t *slb = &env->slb[slot];
 147
 148     if (rb & (0x1000 - env->slb_nr)) {
 149         return -1; /* Reserved bits set or slot too high */
 150     }
 151     if (rs & (SLB_VSID_B & ~SLB_VSID_B_1T)) {
 152         return -1; /* Bad segment size */
 153     }
 154     if ((rs & SLB_VSID_B) && !(env->mmu_model & POWERPC_MMU_1TSEG)) {
 155         return -1; /* 1T segment on MMU that doesn't support it */
 156     }
 157
 158     /* Mask out the slot number as we store the entry */
 159     slb->esid = rb & (SLB_ESID_ESID | SLB_ESID_V);
 160     slb->vsid = rs;
 161
 162     LOG_SLB("%s: %d " TARGET_FMT_lx " - " TARGET_FMT_lx " => %016" PRIx64
 163             " %016" PRIx64 "\n", __func__, slot, rb, rs,
 164             slb->esid, slb->vsid);
 165
 166     return 0;
 167 }
 168
 169 static int ppc_load_slb_esid(CPUPPCState *env, target_ulong rb,
 170                              target_ulong *rt)
 171 {
 172     int slot = rb & 0xfff;
 173     ppc_slb_t *slb = &env->slb[slot];
 174
 175     if (slot >= env->slb_nr) {
 176         return -1;
 177     }
 178
 179     *rt = slb->esid;
 180     return 0;
 181 }
 182
 183 static int ppc_load_slb_vsid(CPUPPCState *env, target_ulong rb,
 184                              target_ulong *rt)
 185 {
 186     int slot = rb & 0xfff;
 187     ppc_slb_t *slb = &env->slb[slot];
 188
 189     if (slot >= env->slb_nr) {
 190         return -1;
 191     }
 192
 193     *rt = slb->vsid;
 194     return 0;
 195 }
 196
 197 void helper_store_slb(CPUPPCState *env, target_ulong rb, target_ulong rs)
 198 {
 199     if (ppc_store_slb(env, rb, rs) < 0) {
 200         helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
 201                                    POWERPC_EXCP_INVAL);
 202     }
 203 }
 204
 205 target_ulong helper_load_slb_esid(CPUPPCState *env, target_ulong rb)
 206 {
 207     target_ulong rt = 0;
 208
 209     if (ppc_load_slb_esid(env, rb, &rt) < 0) {
 210         helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
 211                                    POWERPC_EXCP_INVAL);
 212     }
 213     return rt;
 214 }
 215
 216 target_ulong helper_load_slb_vsid(CPUPPCState *env, target_ulong rb)
 217 {
 218     target_ulong rt = 0;
 219
 220     if (ppc_load_slb_vsid(env, rb, &rt) < 0) {
 221         helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
 222                                    POWERPC_EXCP_INVAL);
 223     }
 224     return rt;
 225 }
 226
 227 /*
 228  * 64-bit hash table MMU handling
 229  */
 230
 231 static int ppc_hash64_pte_prot(CPUPPCState *env,
 232                                ppc_slb_t *slb, ppc_hash_pte64_t pte)
 233 {
 234     unsigned pp, key;
 235     /* Some pp bit combinations have undefined behaviour, so default
 236      * to no access in those cases */
 237     int prot = 0;
 238
 239     key = !!(msr_pr ? (slb->vsid & SLB_VSID_KP)
 240              : (slb->vsid & SLB_VSID_KS));
 241     pp = (pte.pte1 & HPTE64_R_PP) | ((pte.pte1 & HPTE64_R_PP0) >> 61);
 242
 243     if (key == 0) {
 244         switch (pp) {
 245         case 0x0:
 246         case 0x1:
 247         case 0x2:
 248             prot = PAGE_READ | PAGE_WRITE;
 249             break;
 250
 251         case 0x3:
 252         case 0x6:
 253             prot = PAGE_READ;
 254             break;
 255         }
 256     } else {
 257         switch (pp) {
 258         case 0x0:
 259         case 0x6:
 260             prot = 0;
 261             break;
 262
 263         case 0x1:
 264         case 0x3:
 265             prot = PAGE_READ;
 266             break;
 267
 268         case 0x2:
 269             prot = PAGE_READ | PAGE_WRITE;
 270             break;
 271         }
 272     }
 273
 274     /* No execute if either noexec or guarded bits set */
 275     if (!(pte.pte1 & HPTE64_R_N) || (pte.pte1 & HPTE64_R_G)
 276         || (slb->vsid & SLB_VSID_N)) {
 277         prot |= PAGE_EXEC;
 278     }
 279
 280     return prot;
 281 }
 282
 283 static int ppc_hash64_amr_prot(CPUPPCState *env, ppc_hash_pte64_t pte)
 284 {
 285     int key, amrbits;
 286     int prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 287
 288
 289     /* Only recent MMUs implement Virtual Page Class Key Protection */
 290     if (!(env->mmu_model & POWERPC_MMU_AMR)) {
 291         return prot;
 292     }
 293
 294     key = HPTE64_R_KEY(pte.pte1);
 295     amrbits = (env->spr[SPR_AMR] >> 2*(31 - key)) & 0x3;
 296
 297     /* fprintf(stderr, "AMR protection: key=%d AMR=0x%" PRIx64 "\n", key, */
 298     /*         env->spr[SPR_AMR]); */
 299
 300     /*
 301      * A store is permitted if the AMR bit is 0. Remove write
 302      * protection if it is set.
 303      */
 304     if (amrbits & 0x2) {
 305         prot &= ~PAGE_WRITE;
 306     }
 307     /*
 308      * A load is permitted if the AMR bit is 0. Remove read
 309      * protection if it is set.
 310      */
 311     if (amrbits & 0x1) {
 312         prot &= ~PAGE_READ;
 313     }
 314
 315     return prot;
 316 }
 317
 318 uint64_t ppc_hash64_start_access(PowerPCCPU *cpu, target_ulong pte_index)
 319 {
 320     uint64_t token = 0;
 321     hwaddr pte_offset;
 322
 323     pte_offset = pte_index * HASH_PTE_SIZE_64;
 324     if (kvmppc_kern_htab) {
 325         /*
 326          * HTAB is controlled by KVM. Fetch the PTEG into a new buffer.
 327          */
 328         token = kvmppc_hash64_read_pteg(cpu, pte_index);
 329         if (token) {
 330             return token;
 331         }
 332         /*
 333          * pteg read failed, even though we have allocated htab via
 334          * kvmppc_reset_htab.
 335          */
 336         return 0;
 337     }
 338     /*
 339      * HTAB is controlled by QEMU. Just point to the internally
 340      * accessible PTEG.
 341      */
 342     if (cpu->env.external_htab) {
 343         token = (uint64_t)(uintptr_t) cpu->env.external_htab + pte_offset;
 344     } else if (cpu->env.htab_base) {
 345         token = cpu->env.htab_base + pte_offset;
 346     }
 347     return token;
 348 }
 349
 350 void ppc_hash64_stop_access(uint64_t token)
 351 {
 352     if (kvmppc_kern_htab) {
 353         return kvmppc_hash64_free_pteg(token);
 354     }
 355 }
 356
 357 static hwaddr ppc_hash64_pteg_search(CPUPPCState *env, hwaddr hash,
 358                                      bool secondary, target_ulong ptem,
 359                                      ppc_hash_pte64_t *pte)
 360 {
 361     int i;
 362     uint64_t token;
 363     target_ulong pte0, pte1;
 364     target_ulong pte_index;
 365
 366     pte_index = (hash & env->htab_mask) * HPTES_PER_GROUP;
 367     token = ppc_hash64_start_access(ppc_env_get_cpu(env), pte_index);
 368     if (!token) {
 369         return -1;
 370     }
 371     for (i = 0; i < HPTES_PER_GROUP; i++) {
 372         pte0 = ppc_hash64_load_hpte0(env, token, i);
 373         pte1 = ppc_hash64_load_hpte1(env, token, i);
 374
 375         if ((pte0 & HPTE64_V_VALID)
 376             && (secondary == !!(pte0 & HPTE64_V_SECONDARY))
 377             && HPTE64_V_COMPARE(pte0, ptem)) {
 378             pte->pte0 = pte0;
 379             pte->pte1 = pte1;
 380             ppc_hash64_stop_access(token);
 381             return (pte_index + i) * HASH_PTE_SIZE_64;
 382         }
 383     }
 384     ppc_hash64_stop_access(token);
 385     /*
 386      * We didn't find a valid entry.
 387      */
 388     return -1;
 389 }
 390
 391 static hwaddr ppc_hash64_htab_lookup(CPUPPCState *env,
 392                                      ppc_slb_t *slb, target_ulong eaddr,
 393                                      ppc_hash_pte64_t *pte)
 394 {
 395     hwaddr pte_offset;
 396     hwaddr hash;
 397     uint64_t vsid, epnshift, epnmask, epn, ptem;
 398
 399     /* Page size according to the SLB, which we use to generate the
 400      * EPN for hash table lookup..  When we implement more recent MMU
 401      * extensions this might be different from the actual page size
 402      * encoded in the PTE */
 403     epnshift = (slb->vsid & SLB_VSID_L)
 404         ? TARGET_PAGE_BITS_16M : TARGET_PAGE_BITS;
 405     epnmask = ~((1ULL << epnshift) - 1);
 406
 407     if (slb->vsid & SLB_VSID_B) {
 408         /* 1TB segment */
 409         vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT_1T;
 410         epn = (eaddr & ~SEGMENT_MASK_1T) & epnmask;
 411         hash = vsid ^ (vsid << 25) ^ (epn >> epnshift);
 412     } else {
 413         /* 256M segment */
 414         vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT;
 415         epn = (eaddr & ~SEGMENT_MASK_256M) & epnmask;
 416         hash = vsid ^ (epn >> epnshift);
 417     }
 418     ptem = (slb->vsid & SLB_VSID_PTEM) | ((epn >> 16) & HPTE64_V_AVPN);
 419
 420     /* Page address translation */
 421     LOG_MMU("htab_base " TARGET_FMT_plx " htab_mask " TARGET_FMT_plx
 422             " hash " TARGET_FMT_plx "\n",
 423             env->htab_base, env->htab_mask, hash);
 424
 425     /* Primary PTEG lookup */
 426     LOG_MMU("0 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
 427             " vsid=" TARGET_FMT_lx " ptem=" TARGET_FMT_lx
 428             " hash=" TARGET_FMT_plx "\n",
 429             env->htab_base, env->htab_mask, vsid, ptem,  hash);
 430     pte_offset = ppc_hash64_pteg_search(env, hash, 0, ptem, pte);
 431
 432     if (pte_offset == -1) {
 433         /* Secondary PTEG lookup */
 434         LOG_MMU("1 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
 435                 " vsid=" TARGET_FMT_lx " api=" TARGET_FMT_lx
 436                 " hash=" TARGET_FMT_plx "\n", env->htab_base,
 437                 env->htab_mask, vsid, ptem, ~hash);
 438
 439         pte_offset = ppc_hash64_pteg_search(env, ~hash, 1, ptem, pte);
 440     }
 441
 442     return pte_offset;
 443 }
 444
 445 static hwaddr ppc_hash64_pte_raddr(ppc_slb_t *slb, ppc_hash_pte64_t pte,
 446                                    target_ulong eaddr)
 447 {
 448     hwaddr rpn = pte.pte1 & HPTE64_R_RPN;
 449     /* FIXME: Add support for SLLP extended page sizes */
 450     int target_page_bits = (slb->vsid & SLB_VSID_L)
 451         ? TARGET_PAGE_BITS_16M : TARGET_PAGE_BITS;
 452     hwaddr mask = (1ULL << target_page_bits) - 1;
 453
 454     return (rpn & ~mask) | (eaddr & mask);
 455 }
 456
 457 int ppc_hash64_handle_mmu_fault(CPUPPCState *env, target_ulong eaddr,
 458                                 int rwx, int mmu_idx)
 459 {
 460     ppc_slb_t *slb;
 461     hwaddr pte_offset;
 462     ppc_hash_pte64_t pte;
 463     int pp_prot, amr_prot, prot;
 464     uint64_t new_pte1;
 465     const int need_prot[] = {PAGE_READ, PAGE_WRITE, PAGE_EXEC};
 466     hwaddr raddr;
 467
 468     assert((rwx == 0) || (rwx == 1) || (rwx == 2));
 469
 470     /* 1. Handle real mode accesses */
 471     if (((rwx == 2) && (msr_ir == 0)) || ((rwx != 2) && (msr_dr == 0))) {
 472         /* Translation is off */
 473         /* In real mode the top 4 effective address bits are ignored */
 474         raddr = eaddr & 0x0FFFFFFFFFFFFFFFULL;
 475         tlb_set_page(env, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
 476                      PAGE_READ | PAGE_WRITE | PAGE_EXEC, mmu_idx,
 477                      TARGET_PAGE_SIZE);
 478         return 0;
 479     }
 480
 481     /* 2. Translation is on, so look up the SLB */
 482     slb = slb_lookup(env, eaddr);
 483
 484     if (!slb) {
 485         if (rwx == 2) {
 486             env->exception_index = POWERPC_EXCP_ISEG;
 487             env->error_code = 0;
 488         } else {
 489             env->exception_index = POWERPC_EXCP_DSEG;
 490             env->error_code = 0;
 491             env->spr[SPR_DAR] = eaddr;
 492         }
 493         return 1;
 494     }
 495
 496     /* 3. Check for segment level no-execute violation */
 497     if ((rwx == 2) && (slb->vsid & SLB_VSID_N)) {
 498         env->exception_index = POWERPC_EXCP_ISI;
 499         env->error_code = 0x10000000;
 500         return 1;
 501     }
 502
 503     /* 4. Locate the PTE in the hash table */
 504     pte_offset = ppc_hash64_htab_lookup(env, slb, eaddr, &pte);
 505     if (pte_offset == -1) {
 506         if (rwx == 2) {
 507             env->exception_index = POWERPC_EXCP_ISI;
 508             env->error_code = 0x40000000;
 509         } else {
 510             env->exception_index = POWERPC_EXCP_DSI;
 511             env->error_code = 0;
 512             env->spr[SPR_DAR] = eaddr;
 513             if (rwx == 1) {
 514                 env->spr[SPR_DSISR] = 0x42000000;
 515             } else {
 516                 env->spr[SPR_DSISR] = 0x40000000;
 517             }
 518         }
 519         return 1;
 520     }
 521     LOG_MMU("found PTE at offset %08" HWADDR_PRIx "\n", pte_offset);
 522
 523     /* 5. Check access permissions */
 524
 525     pp_prot = ppc_hash64_pte_prot(env, slb, pte);
 526     amr_prot = ppc_hash64_amr_prot(env, pte);
 527     prot = pp_prot & amr_prot;
 528
 529     if ((need_prot[rwx] & ~prot) != 0) {
 530         /* Access right violation */
 531         LOG_MMU("PTE access rejected\n");
 532         if (rwx == 2) {
 533             env->exception_index = POWERPC_EXCP_ISI;
 534             env->error_code = 0x08000000;
 535         } else {
 536             target_ulong dsisr = 0;
 537
 538             env->exception_index = POWERPC_EXCP_DSI;
 539             env->error_code = 0;
 540             env->spr[SPR_DAR] = eaddr;
 541             if (need_prot[rwx] & ~pp_prot) {
 542                 dsisr |= 0x08000000;
 543             }
 544             if (rwx == 1) {
 545                 dsisr |= 0x02000000;
 546             }
 547             if (need_prot[rwx] & ~amr_prot) {
 548                 dsisr |= 0x00200000;
 549             }
 550             env->spr[SPR_DSISR] = dsisr;
 551         }
 552         return 1;
 553     }
 554
 555     LOG_MMU("PTE access granted !\n");
 556
 557     /* 6. Update PTE referenced and changed bits if necessary */
 558
 559     new_pte1 = pte.pte1 | HPTE64_R_R; /* set referenced bit */
 560     if (rwx == 1) {
 561         new_pte1 |= HPTE64_R_C; /* set changed (dirty) bit */
 562     } else {
 563         /* Treat the page as read-only for now, so that a later write
 564          * will pass through this function again to set the C bit */
 565         prot &= ~PAGE_WRITE;
 566     }
 567
 568     if (new_pte1 != pte.pte1) {
 569         ppc_hash64_store_hpte(env, pte_offset / HASH_PTE_SIZE_64,
 570                               pte.pte0, new_pte1);
 571     }
 572
 573     /* 7. Determine the real address from the PTE */
 574
 575     raddr = ppc_hash64_pte_raddr(slb, pte, eaddr);
 576
 577     tlb_set_page(env, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
 578                  prot, mmu_idx, TARGET_PAGE_SIZE);
 579
 580     return 0;
 581 }
 582
 583 hwaddr ppc_hash64_get_phys_page_debug(CPUPPCState *env, target_ulong addr)
 584 {
 585     ppc_slb_t *slb;
 586     hwaddr pte_offset;
 587     ppc_hash_pte64_t pte;
 588
 589     if (msr_dr == 0) {
 590         /* In real mode the top 4 effective address bits are ignored */
 591         return addr & 0x0FFFFFFFFFFFFFFFULL;
 592     }
 593
 594     slb = slb_lookup(env, addr);
 595     if (!slb) {
 596         return -1;
 597     }
 598
 599     pte_offset = ppc_hash64_htab_lookup(env, slb, addr, &pte);
 600     if (pte_offset == -1) {
 601         return -1;
 602     }
 603
 604     return ppc_hash64_pte_raddr(slb, pte, addr) & TARGET_PAGE_MASK;
 605 }
 606
 607 void ppc_hash64_store_hpte(CPUPPCState *env,
 608                            target_ulong pte_index,
 609                            target_ulong pte0, target_ulong pte1)
 610 {
 611     CPUState *cs = ENV_GET_CPU(env);
 612
 613     if (kvmppc_kern_htab) {
 614         return kvmppc_hash64_write_pte(env, pte_index, pte0, pte1);
 615     }
 616
 617     pte_index *= HASH_PTE_SIZE_64;
 618     if (env->external_htab) {
 619         stq_p(env->external_htab + pte_index, pte0);
 620         stq_p(env->external_htab + pte_index + HASH_PTE_SIZE_64/2, pte1);
 621     } else {
 622         stq_phys(cs->as, env->htab_base + pte_index, pte0);
 623         stq_phys(cs->as, env->htab_base + pte_index + HASH_PTE_SIZE_64/2, pte1);
 624     }
 625 }