aboutsummaryrefslogtreecommitdiff
path: root/target-ppc/mmu-hash64.c
blob: 67fc1b5dec5ef7d29e3542d0b3a83b803b2bc751 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
/*
 *  PowerPC MMU, TLB, SLB and BAT emulation helpers for QEMU.
 *
 *  Copyright (c) 2003-2007 Jocelyn Mayer
 *  Copyright (c) 2013 David Gibson, IBM Corporation
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
#include "cpu.h"
#include "helper.h"
#include "sysemu/kvm.h"
#include "kvm_ppc.h"
#include "mmu-hash64.h"

//#define DEBUG_MMU
//#define DEBUG_SLB

#ifdef DEBUG_MMU
#  define LOG_MMU(...) qemu_log(__VA_ARGS__)
#  define LOG_MMU_STATE(cpu) log_cpu_state((cpu), 0)
#else
#  define LOG_MMU(...) do { } while (0)
#  define LOG_MMU_STATE(cpu) do { } while (0)
#endif

#ifdef DEBUG_SLB
#  define LOG_SLB(...) qemu_log(__VA_ARGS__)
#else
#  define LOG_SLB(...) do { } while (0)
#endif

/*
 * SLB handling
 */

static ppc_slb_t *slb_lookup(CPUPPCState *env, target_ulong eaddr)
{
    uint64_t esid_256M, esid_1T;
    int n;

    LOG_SLB("%s: eaddr " TARGET_FMT_lx "\n", __func__, eaddr);

    esid_256M = (eaddr & SEGMENT_MASK_256M) | SLB_ESID_V;
    esid_1T = (eaddr & SEGMENT_MASK_1T) | SLB_ESID_V;

    for (n = 0; n < env->slb_nr; n++) {
        ppc_slb_t *slb = &env->slb[n];

        LOG_SLB("%s: slot %d %016" PRIx64 " %016"
                    PRIx64 "\n", __func__, n, slb->esid, slb->vsid);
        /* We check for 1T matches on all MMUs here - if the MMU
         * doesn't have 1T segment support, we will have prevented 1T
         * entries from being inserted in the slbmte code. */
        if (((slb->esid == esid_256M) &&
             ((slb->vsid & SLB_VSID_B) == SLB_VSID_B_256M))
            || ((slb->esid == esid_1T) &&
                ((slb->vsid & SLB_VSID_B) == SLB_VSID_B_1T))) {
            return slb;
        }
    }

    return NULL;
}

void dump_slb(FILE *f, fprintf_function cpu_fprintf, CPUPPCState *env)
{
    int i;
    uint64_t slbe, slbv;

    cpu_synchronize_state(CPU(ppc_env_get_cpu(env)));

    cpu_fprintf(f, "SLB\tESID\t\t\tVSID\n");
    for (i = 0; i < env->slb_nr; i++) {
        slbe = env->slb[i].esid;
        slbv = env->slb[i].vsid;
        if (slbe == 0 && slbv == 0) {
            continue;
        }
        cpu_fprintf(f, "%d\t0x%016" PRIx64 "\t0x%016" PRIx64 "\n",
                    i, slbe, slbv);
    }
}

void helper_slbia(CPUPPCState *env)
{
    int n, do_invalidate;

    do_invalidate = 0;
    /* XXX: Warning: slbia never invalidates the first segment */
    for (n = 1; n < env->slb_nr; n++) {
        ppc_slb_t *slb = &env->slb[n];

        if (slb->esid & SLB_ESID_V) {
            slb->esid &= ~SLB_ESID_V;
            /* XXX: given the fact that segment size is 256 MB or 1TB,
             *      and we still don't have a tlb_flush_mask(env, n, mask)
             *      in QEMU, we just invalidate all TLBs
             */
            do_invalidate = 1;
        }
    }
    if (do_invalidate) {
        tlb_flush(env, 1);
    }
}

void helper_slbie(CPUPPCState *env, target_ulong addr)
{
    ppc_slb_t *slb;

    slb = slb_lookup(env, addr);
    if (!slb) {
        return;
    }

    if (slb->esid & SLB_ESID_V) {
        slb->esid &= ~SLB_ESID_V;

        /* XXX: given the fact that segment size is 256 MB or 1TB,
         *      and we still don't have a tlb_flush_mask(env, n, mask)
         *      in QEMU, we just invalidate all TLBs
         */
        tlb_flush(env, 1);
    }
}

int ppc_store_slb(CPUPPCState *env, target_ulong rb, target_ulong rs)
{
    int slot = rb & 0xfff;
    ppc_slb_t *slb = &env->slb[slot];

    if (rb & (0x1000 - env->slb_nr)) {
        return -1; /* Reserved bits set or slot too high */
    }
    if (rs & (SLB_VSID_B & ~SLB_VSID_B_1T)) {
        return -1; /* Bad segment size */
    }
    if ((rs & SLB_VSID_B) && !(env->mmu_model & POWERPC_MMU_1TSEG)) {
        return -1; /* 1T segment on MMU that doesn't support it */
    }

    /* Mask out the slot number as we store the entry */
    slb->esid = rb & (SLB_ESID_ESID | SLB_ESID_V);
    slb->vsid = rs;

    LOG_SLB("%s: %d " TARGET_FMT_lx " - " TARGET_FMT_lx " => %016" PRIx64
            " %016" PRIx64 "\n", __func__, slot, rb, rs,
            slb->esid, slb->vsid);

    return 0;
}

static int ppc_load_slb_esid(CPUPPCState *env, target_ulong rb,
                             target_ulong *rt)
{
    int slot = rb & 0xfff;
    ppc_slb_t *slb = &env->slb[slot];

    if (slot >= env->slb_nr) {
        return -1;
    }

    *rt = slb->esid;
    return 0;
}

static int ppc_load_slb_vsid(CPUPPCState *env, target_ulong rb,
                             target_ulong *rt)
{
    int slot = rb & 0xfff;
    ppc_slb_t *slb = &env->slb[slot];

    if (slot >= env->slb_nr) {
        return -1;
    }

    *rt = slb->vsid;
    return 0;
}

void helper_store_slb(CPUPPCState *env, target_ulong rb, target_ulong rs)
{
    if (ppc_store_slb(env, rb, rs) < 0) {
        helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
                                   POWERPC_EXCP_INVAL);
    }
}

target_ulong helper_load_slb_esid(CPUPPCState *env, target_ulong rb)
{
    target_ulong rt = 0;

    if (ppc_load_slb_esid(env, rb, &rt) < 0) {
        helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
                                   POWERPC_EXCP_INVAL);
    }
    return rt;
}

target_ulong helper_load_slb_vsid(CPUPPCState *env, target_ulong rb)
{
    target_ulong rt = 0;

    if (ppc_load_slb_vsid(env, rb, &rt) < 0) {
        helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
                                   POWERPC_EXCP_INVAL);
    }
    return rt;
}

/*
 * 64-bit hash table MMU handling
 */

static int ppc_hash64_pte_prot(CPUPPCState *env,
                               ppc_slb_t *slb, ppc_hash_pte64_t pte)
{
    unsigned pp, key;
    /* Some pp bit combinations have undefined behaviour, so default
     * to no access in those cases */
    int prot = 0;

    key = !!(msr_pr ? (slb->vsid & SLB_VSID_KP)
             : (slb->vsid & SLB_VSID_KS));
    pp = (pte.pte1 & HPTE64_R_PP) | ((pte.pte1 & HPTE64_R_PP0) >> 61);

    if (key == 0) {
        switch (pp) {
        case 0x0:
        case 0x1:
        case 0x2:
            prot = PAGE_READ | PAGE_WRITE;
            break;

        case 0x3:
        case 0x6:
            prot = PAGE_READ;
            break;
        }
    } else {
        switch (pp) {
        case 0x0:
        case 0x6:
            prot = 0;
            break;

        case 0x1:
        case 0x3:
            prot = PAGE_READ;
            break;

        case 0x2:
            prot = PAGE_READ | PAGE_WRITE;
            break;
        }
    }

    /* No execute if either noexec or guarded bits set */
    if (!(pte.pte1 & HPTE64_R_N) || (pte.pte1 & HPTE64_R_G)
        || (slb->vsid & SLB_VSID_N)) {
        prot |= PAGE_EXEC;
    }

    return prot;
}

static int ppc_hash64_amr_prot(CPUPPCState *env, ppc_hash_pte64_t pte)
{
    int key, amrbits;
    int prot = PAGE_EXEC;


    /* Only recent MMUs implement Virtual Page Class Key Protection */
    if (!(env->mmu_model & POWERPC_MMU_AMR)) {
        return PAGE_READ | PAGE_WRITE | PAGE_EXEC;
    }

    key = HPTE64_R_KEY(pte.pte1);
    amrbits = (env->spr[SPR_AMR] >> 2*(31 - key)) & 0x3;

    /* fprintf(stderr, "AMR protection: key=%d AMR=0x%" PRIx64 "\n", key, */
    /*         env->spr[SPR_AMR]); */

    if (amrbits & 0x2) {
        prot |= PAGE_WRITE;
    }
    if (amrbits & 0x1) {
        prot |= PAGE_READ;
    }

    return prot;
}

static hwaddr ppc_hash64_pteg_search(CPUPPCState *env, hwaddr pteg_off,
                                     bool secondary, target_ulong ptem,
                                     ppc_hash_pte64_t *pte)
{
    hwaddr pte_offset = pteg_off;
    target_ulong pte0, pte1;
    int i;

    for (i = 0; i < HPTES_PER_GROUP; i++) {
        pte0 = ppc_hash64_load_hpte0(env, pte_offset);
        pte1 = ppc_hash64_load_hpte1(env, pte_offset);

        if ((pte0 & HPTE64_V_VALID)
            && (secondary == !!(pte0 & HPTE64_V_SECONDARY))
            && HPTE64_V_COMPARE(pte0, ptem)) {
            pte->pte0 = pte0;
            pte->pte1 = pte1;
            return pte_offset;
        }

        pte_offset += HASH_PTE_SIZE_64;
    }

    return -1;
}

static hwaddr ppc_hash64_htab_lookup(CPUPPCState *env,
                                     ppc_slb_t *slb, target_ulong eaddr,
                                     ppc_hash_pte64_t *pte)
{
    hwaddr pteg_off, pte_offset;
    hwaddr hash;
    uint64_t vsid, epnshift, epnmask, epn, ptem;

    /* Page size according to the SLB, which we use to generate the
     * EPN for hash table lookup..  When we implement more recent MMU
     * extensions this might be different from the actual page size
     * encoded in the PTE */
    epnshift = (slb->vsid & SLB_VSID_L)
        ? TARGET_PAGE_BITS_16M : TARGET_PAGE_BITS;
    epnmask = ~((1ULL << epnshift) - 1);

    if (slb->vsid & SLB_VSID_B) {
        /* 1TB segment */
        vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT_1T;
        epn = (eaddr & ~SEGMENT_MASK_1T) & epnmask;
        hash = vsid ^ (vsid << 25) ^ (epn >> epnshift);
    } else {
        /* 256M segment */
        vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT;
        epn = (eaddr & ~SEGMENT_MASK_256M) & epnmask;
        hash = vsid ^ (epn >> epnshift);
    }
    ptem = (slb->vsid & SLB_VSID_PTEM) | ((epn >> 16) & HPTE64_V_AVPN);

    /* Page address translation */
    LOG_MMU("htab_base " TARGET_FMT_plx " htab_mask " TARGET_FMT_plx
            " hash " TARGET_FMT_plx "\n",
            env->htab_base, env->htab_mask, hash);

    /* Primary PTEG lookup */
    LOG_MMU("0 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
            " vsid=" TARGET_FMT_lx " ptem=" TARGET_FMT_lx
            " hash=" TARGET_FMT_plx "\n",
            env->htab_base, env->htab_mask, vsid, ptem,  hash);
    pteg_off = (hash * HASH_PTEG_SIZE_64) & env->htab_mask;
    pte_offset = ppc_hash64_pteg_search(env, pteg_off, 0, ptem, pte);

    if (pte_offset == -1) {
        /* Secondary PTEG lookup */
        LOG_MMU("1 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
                " vsid=" TARGET_FMT_lx " api=" TARGET_FMT_lx
                " hash=" TARGET_FMT_plx "\n", env->htab_base,
                env->htab_mask, vsid, ptem, ~hash);

        pteg_off = (~hash * HASH_PTEG_SIZE_64) & env->htab_mask;
        pte_offset = ppc_hash64_pteg_search(env, pteg_off, 1, ptem, pte);
    }

    return pte_offset;
}

static hwaddr ppc_hash64_pte_raddr(ppc_slb_t *slb, ppc_hash_pte64_t pte,
                                   target_ulong eaddr)
{
    hwaddr rpn = pte.pte1 & HPTE64_R_RPN;
    /* FIXME: Add support for SLLP extended page sizes */
    int target_page_bits = (slb->vsid & SLB_VSID_L)
        ? TARGET_PAGE_BITS_16M : TARGET_PAGE_BITS;
    hwaddr mask = (1ULL << target_page_bits) - 1;

    return (rpn & ~mask) | (eaddr & mask);
}

int ppc_hash64_handle_mmu_fault(CPUPPCState *env, target_ulong eaddr,
                                int rwx, int mmu_idx)
{
    ppc_slb_t *slb;
    hwaddr pte_offset;
    ppc_hash_pte64_t pte;
    int pp_prot, amr_prot, prot;
    uint64_t new_pte1;
    const int need_prot[] = {PAGE_READ, PAGE_WRITE, PAGE_EXEC};
    hwaddr raddr;

    assert((rwx == 0) || (rwx == 1) || (rwx == 2));

    /* 1. Handle real mode accesses */
    if (((rwx == 2) && (msr_ir == 0)) || ((rwx != 2) && (msr_dr == 0))) {
        /* Translation is off */
        /* In real mode the top 4 effective address bits are ignored */
        raddr = eaddr & 0x0FFFFFFFFFFFFFFFULL;
        tlb_set_page(env, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
                     PAGE_READ | PAGE_WRITE | PAGE_EXEC, mmu_idx,
                     TARGET_PAGE_SIZE);
        return 0;
    }

    /* 2. Translation is on, so look up the SLB */
    slb = slb_lookup(env, eaddr);

    if (!slb) {
        if (rwx == 2) {
            env->exception_index = POWERPC_EXCP_ISEG;
            env->error_code = 0;
        } else {
            env->exception_index = POWERPC_EXCP_DSEG;
            env->error_code = 0;
            env->spr[SPR_DAR] = eaddr;
        }
        return 1;
    }

    /* 3. Check for segment level no-execute violation */
    if ((rwx == 2) && (slb->vsid & SLB_VSID_N)) {
        env->exception_index = POWERPC_EXCP_ISI;
        env->error_code = 0x10000000;
        return 1;
    }

    /* 4. Locate the PTE in the hash table */
    pte_offset = ppc_hash64_htab_lookup(env, slb, eaddr, &pte);
    if (pte_offset == -1) {
        if (rwx == 2) {
            env->exception_index = POWERPC_EXCP_ISI;
            env->error_code = 0x40000000;
        } else {
            env->exception_index = POWERPC_EXCP_DSI;
            env->error_code = 0;
            env->spr[SPR_DAR] = eaddr;
            if (rwx == 1) {
                env->spr[SPR_DSISR] = 0x42000000;
            } else {
                env->spr[SPR_DSISR] = 0x40000000;
            }
        }
        return 1;
    }
    LOG_MMU("found PTE at offset %08" HWADDR_PRIx "\n", pte_offset);

    /* 5. Check access permissions */

    pp_prot = ppc_hash64_pte_prot(env, slb, pte);
    amr_prot = ppc_hash64_amr_prot(env, pte);
    prot = pp_prot & amr_prot;

    if ((need_prot[rwx] & ~prot) != 0) {
        /* Access right violation */
        LOG_MMU("PTE access rejected\n");
        if (rwx == 2) {
            env->exception_index = POWERPC_EXCP_ISI;
            env->error_code = 0x08000000;
        } else {
            target_ulong dsisr = 0;

            env->exception_index = POWERPC_EXCP_DSI;
            env->error_code = 0;
            env->spr[SPR_DAR] = eaddr;
            if (need_prot[rwx] & ~pp_prot) {
                dsisr |= 0x08000000;
            }
            if (rwx == 1) {
                dsisr |= 0x02000000;
            }
            if (need_prot[rwx] & ~amr_prot) {
                dsisr |= 0x00200000;
            }
            env->spr[SPR_DSISR] = dsisr;
        }
        return 1;
    }

    LOG_MMU("PTE access granted !\n");

    /* 6. Update PTE referenced and changed bits if necessary */

    new_pte1 = pte.pte1 | HPTE64_R_R; /* set referenced bit */
    if (rwx == 1) {
        new_pte1 |= HPTE64_R_C; /* set changed (dirty) bit */
    } else {
        /* Treat the page as read-only for now, so that a later write
         * will pass through this function again to set the C bit */
        prot &= ~PAGE_WRITE;
    }

    if (new_pte1 != pte.pte1) {
        ppc_hash64_store_hpte1(env, pte_offset, new_pte1);
    }

    /* 7. Determine the real address from the PTE */

    raddr = ppc_hash64_pte_raddr(slb, pte, eaddr);

    tlb_set_page(env, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
                 prot, mmu_idx, TARGET_PAGE_SIZE);

    return 0;
}

hwaddr ppc_hash64_get_phys_page_debug(CPUPPCState *env, target_ulong addr)
{
    ppc_slb_t *slb;
    hwaddr pte_offset;
    ppc_hash_pte64_t pte;

    if (msr_dr == 0) {
        /* In real mode the top 4 effective address bits are ignored */
        return addr & 0x0FFFFFFFFFFFFFFFULL;
    }

    slb = slb_lookup(env, addr);
    if (!slb) {
        return -1;
    }

    pte_offset = ppc_hash64_htab_lookup(env, slb, addr, &pte);
    if (pte_offset == -1) {
        return -1;
    }

    return ppc_hash64_pte_raddr(slb, pte, addr) & TARGET_PAGE_MASK;
}