summaryrefslogtreecommitdiffstats
path: root/target-sh4/helper.c
blob: fd4efee4a62ab00d7a2d931f0e0183944f7cf538 (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
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
/*
 *  SH4 emulation
 *
 *  Copyright (c) 2005 Samuel Tardieu
 *
 * 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 <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <signal.h>

#include "cpu.h"

#if !defined(CONFIG_USER_ONLY)
#include "hw/sh_intc.h"
#endif

#if defined(CONFIG_USER_ONLY)

void do_interrupt (CPUSH4State *env)
{
  env->exception_index = -1;
}

int cpu_sh4_handle_mmu_fault(CPUSH4State * env, target_ulong address, int rw,
                             int mmu_idx)
{
    env->tea = address;
    env->exception_index = -1;
    switch (rw) {
    case 0:
        env->exception_index = 0x0a0;
        break;
    case 1:
        env->exception_index = 0x0c0;
        break;
    case 2:
        env->exception_index = 0x0a0;
        break;
    }
    return 1;
}

int cpu_sh4_is_cached(CPUSH4State * env, target_ulong addr)
{
    /* For user mode, only U0 area is cachable. */
    return !(addr & 0x80000000);
}

#else /* !CONFIG_USER_ONLY */

#define MMU_OK                   0
#define MMU_ITLB_MISS            (-1)
#define MMU_ITLB_MULTIPLE        (-2)
#define MMU_ITLB_VIOLATION       (-3)
#define MMU_DTLB_MISS_READ       (-4)
#define MMU_DTLB_MISS_WRITE      (-5)
#define MMU_DTLB_INITIAL_WRITE   (-6)
#define MMU_DTLB_VIOLATION_READ  (-7)
#define MMU_DTLB_VIOLATION_WRITE (-8)
#define MMU_DTLB_MULTIPLE        (-9)
#define MMU_DTLB_MISS            (-10)
#define MMU_IADDR_ERROR          (-11)
#define MMU_DADDR_ERROR_READ     (-12)
#define MMU_DADDR_ERROR_WRITE    (-13)

void do_interrupt(CPUSH4State *env)
{
    CPUState *cs = CPU(sh_env_get_cpu(env));
    int do_irq = cs->interrupt_request & CPU_INTERRUPT_HARD;
    int do_exp, irq_vector = env->exception_index;

    /* prioritize exceptions over interrupts */

    do_exp = env->exception_index != -1;
    do_irq = do_irq && (env->exception_index == -1);

    if (env->sr & SR_BL) {
        if (do_exp && env->exception_index != 0x1e0) {
            env->exception_index = 0x000; /* masked exception -> reset */
        }
        if (do_irq && !env->in_sleep) {
            return; /* masked */
        }
    }
    env->in_sleep = 0;

    if (do_irq) {
        irq_vector = sh_intc_get_pending_vector(env->intc_handle,
						(env->sr >> 4) & 0xf);
        if (irq_vector == -1) {
            return; /* masked */
	}
    }

    if (qemu_loglevel_mask(CPU_LOG_INT)) {
	const char *expname;
	switch (env->exception_index) {
	case 0x0e0:
	    expname = "addr_error";
	    break;
	case 0x040:
	    expname = "tlb_miss";
	    break;
	case 0x0a0:
	    expname = "tlb_violation";
	    break;
	case 0x180:
	    expname = "illegal_instruction";
	    break;
	case 0x1a0:
	    expname = "slot_illegal_instruction";
	    break;
	case 0x800:
	    expname = "fpu_disable";
	    break;
	case 0x820:
	    expname = "slot_fpu";
	    break;
	case 0x100:
	    expname = "data_write";
	    break;
	case 0x060:
	    expname = "dtlb_miss_write";
	    break;
	case 0x0c0:
	    expname = "dtlb_violation_write";
	    break;
	case 0x120:
	    expname = "fpu_exception";
	    break;
	case 0x080:
	    expname = "initial_page_write";
	    break;
	case 0x160:
	    expname = "trapa";
	    break;
	default:
            expname = do_irq ? "interrupt" : "???";
            break;
	}
	qemu_log("exception 0x%03x [%s] raised\n",
		  irq_vector, expname);
	log_cpu_state(env, 0);
    }

    env->ssr = env->sr;
    env->spc = env->pc;
    env->sgr = env->gregs[15];
    env->sr |= SR_BL | SR_MD | SR_RB;

    if (env->flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL)) {
        /* Branch instruction should be executed again before delay slot. */
	env->spc -= 2;
	/* Clear flags for exception/interrupt routine. */
	env->flags &= ~(DELAY_SLOT | DELAY_SLOT_CONDITIONAL | DELAY_SLOT_TRUE);
    }
    if (env->flags & DELAY_SLOT_CLEARME)
        env->flags = 0;

    if (do_exp) {
        env->expevt = env->exception_index;
        switch (env->exception_index) {
        case 0x000:
        case 0x020:
        case 0x140:
            env->sr &= ~SR_FD;
            env->sr |= 0xf << 4; /* IMASK */
            env->pc = 0xa0000000;
            break;
        case 0x040:
        case 0x060:
            env->pc = env->vbr + 0x400;
            break;
        case 0x160:
            env->spc += 2; /* special case for TRAPA */
            /* fall through */
        default:
            env->pc = env->vbr + 0x100;
            break;
        }
        return;
    }

    if (do_irq) {
        env->intevt = irq_vector;
        env->pc = env->vbr + 0x600;
        return;
    }
}

static void update_itlb_use(CPUSH4State * env, int itlbnb)
{
    uint8_t or_mask = 0, and_mask = (uint8_t) - 1;

    switch (itlbnb) {
    case 0:
	and_mask = 0x1f;
	break;
    case 1:
	and_mask = 0xe7;
	or_mask = 0x80;
	break;
    case 2:
	and_mask = 0xfb;
	or_mask = 0x50;
	break;
    case 3:
	or_mask = 0x2c;
	break;
    }

    env->mmucr &= (and_mask << 24) | 0x00ffffff;
    env->mmucr |= (or_mask << 24);
}

static int itlb_replacement(CPUSH4State * env)
{
    if ((env->mmucr & 0xe0000000) == 0xe0000000)
	return 0;
    if ((env->mmucr & 0x98000000) == 0x18000000)
	return 1;
    if ((env->mmucr & 0x54000000) == 0x04000000)
	return 2;
    if ((env->mmucr & 0x2c000000) == 0x00000000)
	return 3;
    cpu_abort(env, "Unhandled itlb_replacement");
}

/* Find the corresponding entry in the right TLB
   Return entry, MMU_DTLB_MISS or MMU_DTLB_MULTIPLE
*/
static int find_tlb_entry(CPUSH4State * env, target_ulong address,
			  tlb_t * entries, uint8_t nbtlb, int use_asid)
{
    int match = MMU_DTLB_MISS;
    uint32_t start, end;
    uint8_t asid;
    int i;

    asid = env->pteh & 0xff;

    for (i = 0; i < nbtlb; i++) {
	if (!entries[i].v)
	    continue;		/* Invalid entry */
	if (!entries[i].sh && use_asid && entries[i].asid != asid)
	    continue;		/* Bad ASID */
	start = (entries[i].vpn << 10) & ~(entries[i].size - 1);
	end = start + entries[i].size - 1;
	if (address >= start && address <= end) {	/* Match */
	    if (match != MMU_DTLB_MISS)
		return MMU_DTLB_MULTIPLE;	/* Multiple match */
	    match = i;
	}
    }
    return match;
}

static void increment_urc(CPUSH4State * env)
{
    uint8_t urb, urc;

    /* Increment URC */
    urb = ((env->mmucr) >> 18) & 0x3f;
    urc = ((env->mmucr) >> 10) & 0x3f;
    urc++;
    if ((urb > 0 && urc > urb) || urc > (UTLB_SIZE - 1))
	urc = 0;
    env->mmucr = (env->mmucr & 0xffff03ff) | (urc << 10);
}

/* Copy and utlb entry into itlb
   Return entry
*/
static int copy_utlb_entry_itlb(CPUSH4State *env, int utlb)
{
    int itlb;

    tlb_t * ientry;
    itlb = itlb_replacement(env);
    ientry = &env->itlb[itlb];
    if (ientry->v) {
        tlb_flush_page(env, ientry->vpn << 10);
    }
    *ientry = env->utlb[utlb];
    update_itlb_use(env, itlb);
    return itlb;
}

/* Find itlb entry
   Return entry, MMU_ITLB_MISS, MMU_ITLB_MULTIPLE or MMU_DTLB_MULTIPLE
*/
static int find_itlb_entry(CPUSH4State * env, target_ulong address,
                           int use_asid)
{
    int e;

    e = find_tlb_entry(env, address, env->itlb, ITLB_SIZE, use_asid);
    if (e == MMU_DTLB_MULTIPLE) {
	e = MMU_ITLB_MULTIPLE;
    } else if (e == MMU_DTLB_MISS) {
	e = MMU_ITLB_MISS;
    } else if (e >= 0) {
	update_itlb_use(env, e);
    }
    return e;
}

/* Find utlb entry
   Return entry, MMU_DTLB_MISS, MMU_DTLB_MULTIPLE */
static int find_utlb_entry(CPUSH4State * env, target_ulong address, int use_asid)
{
    /* per utlb access */
    increment_urc(env);

    /* Return entry */
    return find_tlb_entry(env, address, env->utlb, UTLB_SIZE, use_asid);
}

/* Match address against MMU
   Return MMU_OK, MMU_DTLB_MISS_READ, MMU_DTLB_MISS_WRITE,
   MMU_DTLB_INITIAL_WRITE, MMU_DTLB_VIOLATION_READ,
   MMU_DTLB_VIOLATION_WRITE, MMU_ITLB_MISS,
   MMU_ITLB_MULTIPLE, MMU_ITLB_VIOLATION,
   MMU_IADDR_ERROR, MMU_DADDR_ERROR_READ, MMU_DADDR_ERROR_WRITE.
*/
static int get_mmu_address(CPUSH4State * env, target_ulong * physical,
			   int *prot, target_ulong address,
			   int rw, int access_type)
{
    int use_asid, n;
    tlb_t *matching = NULL;

    use_asid = (env->mmucr & MMUCR_SV) == 0 || (env->sr & SR_MD) == 0;

    if (rw == 2) {
        n = find_itlb_entry(env, address, use_asid);
	if (n >= 0) {
	    matching = &env->itlb[n];
	    if (!(env->sr & SR_MD) && !(matching->pr & 2))
		n = MMU_ITLB_VIOLATION;
	    else
		*prot = PAGE_EXEC;
        } else {
            n = find_utlb_entry(env, address, use_asid);
            if (n >= 0) {
                n = copy_utlb_entry_itlb(env, n);
                matching = &env->itlb[n];
                if (!(env->sr & SR_MD) && !(matching->pr & 2)) {
                      n = MMU_ITLB_VIOLATION;
                } else {
                    *prot = PAGE_READ | PAGE_EXEC;
                    if ((matching->pr & 1) && matching->d) {
                        *prot |= PAGE_WRITE;
                    }
                }
            } else if (n == MMU_DTLB_MULTIPLE) {
                n = MMU_ITLB_MULTIPLE;
            } else if (n == MMU_DTLB_MISS) {
                n = MMU_ITLB_MISS;
            }
	}
    } else {
	n = find_utlb_entry(env, address, use_asid);
	if (n >= 0) {
	    matching = &env->utlb[n];
            if (!(env->sr & SR_MD) && !(matching->pr & 2)) {
                n = (rw == 1) ? MMU_DTLB_VIOLATION_WRITE :
                    MMU_DTLB_VIOLATION_READ;
            } else if ((rw == 1) && !(matching->pr & 1)) {
                n = MMU_DTLB_VIOLATION_WRITE;
            } else if ((rw == 1) && !matching->d) {
                n = MMU_DTLB_INITIAL_WRITE;
            } else {
                *prot = PAGE_READ;
                if ((matching->pr & 1) && matching->d) {
                    *prot |= PAGE_WRITE;
                }
            }
	} else if (n == MMU_DTLB_MISS) {
	    n = (rw == 1) ? MMU_DTLB_MISS_WRITE :
		MMU_DTLB_MISS_READ;
	}
    }
    if (n >= 0) {
	n = MMU_OK;
	*physical = ((matching->ppn << 10) & ~(matching->size - 1)) |
	    (address & (matching->size - 1));
    }
    return n;
}

static int get_physical_address(CPUSH4State * env, target_ulong * physical,
                                int *prot, target_ulong address,
                                int rw, int access_type)
{
    /* P1, P2 and P4 areas do not use translation */
    if ((address >= 0x80000000 && address < 0xc0000000) ||
	address >= 0xe0000000) {
	if (!(env->sr & SR_MD)
	    && (address < 0xe0000000 || address >= 0xe4000000)) {
	    /* Unauthorized access in user mode (only store queues are available) */
	    fprintf(stderr, "Unauthorized access\n");
	    if (rw == 0)
		return MMU_DADDR_ERROR_READ;
	    else if (rw == 1)
		return MMU_DADDR_ERROR_WRITE;
	    else
		return MMU_IADDR_ERROR;
	}
	if (address >= 0x80000000 && address < 0xc0000000) {
	    /* Mask upper 3 bits for P1 and P2 areas */
	    *physical = address & 0x1fffffff;
	} else {
	    *physical = address;
	}
	*prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
	return MMU_OK;
    }

    /* If MMU is disabled, return the corresponding physical page */
    if (!(env->mmucr & MMUCR_AT)) {
	*physical = address & 0x1FFFFFFF;
	*prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
	return MMU_OK;
    }

    /* We need to resort to the MMU */
    return get_mmu_address(env, physical, prot, address, rw, access_type);
}

int cpu_sh4_handle_mmu_fault(CPUSH4State * env, target_ulong address, int rw,
                             int mmu_idx)
{
    target_ulong physical;
    int prot, ret, access_type;

    access_type = ACCESS_INT;
    ret =
	get_physical_address(env, &physical, &prot, address, rw,
			     access_type);

    if (ret != MMU_OK) {
	env->tea = address;
	if (ret != MMU_DTLB_MULTIPLE && ret != MMU_ITLB_MULTIPLE) {
	    env->pteh = (env->pteh & PTEH_ASID_MASK) |
		    (address & PTEH_VPN_MASK);
	}
	switch (ret) {
	case MMU_ITLB_MISS:
	case MMU_DTLB_MISS_READ:
	    env->exception_index = 0x040;
	    break;
	case MMU_DTLB_MULTIPLE:
	case MMU_ITLB_MULTIPLE:
	    env->exception_index = 0x140;
	    break;
	case MMU_ITLB_VIOLATION:
	    env->exception_index = 0x0a0;
	    break;
	case MMU_DTLB_MISS_WRITE:
	    env->exception_index = 0x060;
	    break;
	case MMU_DTLB_INITIAL_WRITE:
	    env->exception_index = 0x080;
	    break;
	case MMU_DTLB_VIOLATION_READ:
	    env->exception_index = 0x0a0;
	    break;
	case MMU_DTLB_VIOLATION_WRITE:
	    env->exception_index = 0x0c0;
	    break;
	case MMU_IADDR_ERROR:
	case MMU_DADDR_ERROR_READ:
	    env->exception_index = 0x0e0;
	    break;
	case MMU_DADDR_ERROR_WRITE:
	    env->exception_index = 0x100;
	    break;
	default:
            cpu_abort(env, "Unhandled MMU fault");
	}
	return 1;
    }

    address &= TARGET_PAGE_MASK;
    physical &= TARGET_PAGE_MASK;

    tlb_set_page(env, address, physical, prot, mmu_idx, TARGET_PAGE_SIZE);
    return 0;
}

hwaddr cpu_get_phys_page_debug(CPUSH4State * env, target_ulong addr)
{
    target_ulong physical;
    int prot;

    get_physical_address(env, &physical, &prot, addr, 0, 0);
    return physical;
}

void cpu_load_tlb(CPUSH4State * env)
{
    int n = cpu_mmucr_urc(env->mmucr);
    tlb_t * entry = &env->utlb[n];

    if (entry->v) {
        /* Overwriting valid entry in utlb. */
        target_ulong address = entry->vpn << 10;
	tlb_flush_page(env, address);
    }

    /* Take values into cpu status from registers. */
    entry->asid = (uint8_t)cpu_pteh_asid(env->pteh);
    entry->vpn  = cpu_pteh_vpn(env->pteh);
    entry->v    = (uint8_t)cpu_ptel_v(env->ptel);
    entry->ppn  = cpu_ptel_ppn(env->ptel);
    entry->sz   = (uint8_t)cpu_ptel_sz(env->ptel);
    switch (entry->sz) {
    case 0: /* 00 */
        entry->size = 1024; /* 1K */
        break;
    case 1: /* 01 */
        entry->size = 1024 * 4; /* 4K */
        break;
    case 2: /* 10 */
        entry->size = 1024 * 64; /* 64K */
        break;
    case 3: /* 11 */
        entry->size = 1024 * 1024; /* 1M */
        break;
    default:
        cpu_abort(env, "Unhandled load_tlb");
        break;
    }
    entry->sh   = (uint8_t)cpu_ptel_sh(env->ptel);
    entry->c    = (uint8_t)cpu_ptel_c(env->ptel);
    entry->pr   = (uint8_t)cpu_ptel_pr(env->ptel);
    entry->d    = (uint8_t)cpu_ptel_d(env->ptel);
    entry->wt   = (uint8_t)cpu_ptel_wt(env->ptel);
    entry->sa   = (uint8_t)cpu_ptea_sa(env->ptea);
    entry->tc   = (uint8_t)cpu_ptea_tc(env->ptea);
}

 void cpu_sh4_invalidate_tlb(CPUSH4State *s)
{
    int i;

    /* UTLB */
    for (i = 0; i < UTLB_SIZE; i++) {
        tlb_t * entry = &s->utlb[i];
        entry->v = 0;
    }
    /* ITLB */
    for (i = 0; i < ITLB_SIZE; i++) {
        tlb_t * entry = &s->itlb[i];
        entry->v = 0;
    }

    tlb_flush(s, 1);
}

uint32_t cpu_sh4_read_mmaped_itlb_addr(CPUSH4State *s,
                                       hwaddr addr)
{
    int index = (addr & 0x00000300) >> 8;
    tlb_t * entry = &s->itlb[index];

    return (entry->vpn  << 10) |
           (entry->v    <<  8) |
           (entry->asid);
}

void cpu_sh4_write_mmaped_itlb_addr(CPUSH4State *s, hwaddr addr,
				    uint32_t mem_value)
{
    uint32_t vpn = (mem_value & 0xfffffc00) >> 10;
    uint8_t v = (uint8_t)((mem_value & 0x00000100) >> 8);
    uint8_t asid = (uint8_t)(mem_value & 0x000000ff);

    int index = (addr & 0x00000300) >> 8;
    tlb_t * entry = &s->itlb[index];
    if (entry->v) {
        /* Overwriting valid entry in itlb. */
        target_ulong address = entry->vpn << 10;
        tlb_flush_page(s, address);
    }
    entry->asid = asid;
    entry->vpn = vpn;
    entry->v = v;
}

uint32_t cpu_sh4_read_mmaped_itlb_data(CPUSH4State *s,
                                       hwaddr addr)
{
    int array = (addr & 0x00800000) >> 23;
    int index = (addr & 0x00000300) >> 8;
    tlb_t * entry = &s->itlb[index];

    if (array == 0) {
        /* ITLB Data Array 1 */
        return (entry->ppn << 10) |
               (entry->v   <<  8) |
               (entry->pr  <<  5) |
               ((entry->sz & 1) <<  6) |
               ((entry->sz & 2) <<  4) |
               (entry->c   <<  3) |
               (entry->sh  <<  1);
    } else {
        /* ITLB Data Array 2 */
        return (entry->tc << 1) |
               (entry->sa);
    }
}

void cpu_sh4_write_mmaped_itlb_data(CPUSH4State *s, hwaddr addr,
                                    uint32_t mem_value)
{
    int array = (addr & 0x00800000) >> 23;
    int index = (addr & 0x00000300) >> 8;
    tlb_t * entry = &s->itlb[index];

    if (array == 0) {
        /* ITLB Data Array 1 */
        if (entry->v) {
            /* Overwriting valid entry in utlb. */
            target_ulong address = entry->vpn << 10;
            tlb_flush_page(s, address);
        }
        entry->ppn = (mem_value & 0x1ffffc00) >> 10;
        entry->v   = (mem_value & 0x00000100) >> 8;
        entry->sz  = (mem_value & 0x00000080) >> 6 |
                     (mem_value & 0x00000010) >> 4;
        entry->pr  = (mem_value & 0x00000040) >> 5;
        entry->c   = (mem_value & 0x00000008) >> 3;
        entry->sh  = (mem_value & 0x00000002) >> 1;
    } else {
        /* ITLB Data Array 2 */
        entry->tc  = (mem_value & 0x00000008) >> 3;
        entry->sa  = (mem_value & 0x00000007);
    }
}

uint32_t cpu_sh4_read_mmaped_utlb_addr(CPUSH4State *s,
                                       hwaddr addr)
{
    int index = (addr & 0x00003f00) >> 8;
    tlb_t * entry = &s->utlb[index];

    increment_urc(s); /* per utlb access */

    return (entry->vpn  << 10) |
           (entry->v    <<  8) |
           (entry->asid);
}

void cpu_sh4_write_mmaped_utlb_addr(CPUSH4State *s, hwaddr addr,
				    uint32_t mem_value)
{
    int associate = addr & 0x0000080;
    uint32_t vpn = (mem_value & 0xfffffc00) >> 10;
    uint8_t d = (uint8_t)((mem_value & 0x00000200) >> 9);
    uint8_t v = (uint8_t)((mem_value & 0x00000100) >> 8);
    uint8_t asid = (uint8_t)(mem_value & 0x000000ff);
    int use_asid = (s->mmucr & MMUCR_SV) == 0 || (s->sr & SR_MD) == 0;

    if (associate) {
        int i;
	tlb_t * utlb_match_entry = NULL;
	int needs_tlb_flush = 0;

	/* search UTLB */
	for (i = 0; i < UTLB_SIZE; i++) {
            tlb_t * entry = &s->utlb[i];
            if (!entry->v)
	        continue;

            if (entry->vpn == vpn
                && (!use_asid || entry->asid == asid || entry->sh)) {
	        if (utlb_match_entry) {
		    /* Multiple TLB Exception */
		    s->exception_index = 0x140;
		    s->tea = addr;
		    break;
	        }
		if (entry->v && !v)
		    needs_tlb_flush = 1;
		entry->v = v;
		entry->d = d;
	        utlb_match_entry = entry;
	    }
	    increment_urc(s); /* per utlb access */
	}

	/* search ITLB */
	for (i = 0; i < ITLB_SIZE; i++) {
            tlb_t * entry = &s->itlb[i];
            if (entry->vpn == vpn
                && (!use_asid || entry->asid == asid || entry->sh)) {
	        if (entry->v && !v)
		    needs_tlb_flush = 1;
	        if (utlb_match_entry)
		    *entry = *utlb_match_entry;
	        else
		    entry->v = v;
		break;
	    }
	}

	if (needs_tlb_flush)
	    tlb_flush_page(s, vpn << 10);
        
    } else {
        int index = (addr & 0x00003f00) >> 8;
        tlb_t * entry = &s->utlb[index];
	if (entry->v) {
	    /* Overwriting valid entry in utlb. */
            target_ulong address = entry->vpn << 10;
	    tlb_flush_page(s, address);
	}
	entry->asid = asid;
	entry->vpn = vpn;
	entry->d = d;
	entry->v = v;
	increment_urc(s);
    }
}

uint32_t cpu_sh4_read_mmaped_utlb_data(CPUSH4State *s,
                                       hwaddr addr)
{
    int array = (addr & 0x00800000) >> 23;
    int index = (addr & 0x00003f00) >> 8;
    tlb_t * entry = &s->utlb[index];

    increment_urc(s); /* per utlb access */

    if (array == 0) {
        /* ITLB Data Array 1 */
        return (entry->ppn << 10) |
               (entry->v   <<  8) |
               (entry->pr  <<  5) |
               ((entry->sz & 1) <<  6) |
               ((entry->sz & 2) <<  4) |
               (entry->c   <<  3) |
               (entry->d   <<  2) |
               (entry->sh  <<  1) |
               (entry->wt);
    } else {
        /* ITLB Data Array 2 */
        return (entry->tc << 1) |
               (entry->sa);
    }
}

void cpu_sh4_write_mmaped_utlb_data(CPUSH4State *s, hwaddr addr,
                                    uint32_t mem_value)
{
    int array = (addr & 0x00800000) >> 23;
    int index = (addr & 0x00003f00) >> 8;
    tlb_t * entry = &s->utlb[index];

    increment_urc(s); /* per utlb access */

    if (array == 0) {
        /* UTLB Data Array 1 */
        if (entry->v) {
            /* Overwriting valid entry in utlb. */
            target_ulong address = entry->vpn << 10;
            tlb_flush_page(s, address);
        }
        entry->ppn = (mem_value & 0x1ffffc00) >> 10;
        entry->v   = (mem_value & 0x00000100) >> 8;
        entry->sz  = (mem_value & 0x00000080) >> 6 |
                     (mem_value & 0x00000010) >> 4;
        entry->pr  = (mem_value & 0x00000060) >> 5;
        entry->c   = (mem_value & 0x00000008) >> 3;
        entry->d   = (mem_value & 0x00000004) >> 2;
        entry->sh  = (mem_value & 0x00000002) >> 1;
        entry->wt  = (mem_value & 0x00000001);
    } else {
        /* UTLB Data Array 2 */
        entry->tc = (mem_value & 0x00000008) >> 3;
        entry->sa = (mem_value & 0x00000007);
    }
}

int cpu_sh4_is_cached(CPUSH4State * env, target_ulong addr)
{
    int n;
    int use_asid = (env->mmucr & MMUCR_SV) == 0 || (env->sr & SR_MD) == 0;

    /* check area */
    if (env->sr & SR_MD) {
        /* For previledged mode, P2 and P4 area is not cachable. */
        if ((0xA0000000 <= addr && addr < 0xC0000000) || 0xE0000000 <= addr)
            return 0;
    } else {
        /* For user mode, only U0 area is cachable. */
        if (0x80000000 <= addr)
            return 0;
    }

    /*
     * TODO : Evaluate CCR and check if the cache is on or off.
     *        Now CCR is not in CPUSH4State, but in SH7750State.
     *        When you move the ccr into CPUSH4State, the code will be
     *        as follows.
     */
#if 0
    /* check if operand cache is enabled or not. */
    if (!(env->ccr & 1))
        return 0;
#endif

    /* if MMU is off, no check for TLB. */
    if (env->mmucr & MMUCR_AT)
        return 1;

    /* check TLB */
    n = find_tlb_entry(env, addr, env->itlb, ITLB_SIZE, use_asid);
    if (n >= 0)
        return env->itlb[n].c;

    n = find_tlb_entry(env, addr, env->utlb, UTLB_SIZE, use_asid);
    if (n >= 0)
        return env->utlb[n].c;

    return 0;
}

#endif
OpenPOWER on IntegriCloud