LXR qemu/target-openrisc/sys

   1/*
   2 * OpenRISC system instructions helper routines
   3 *
   4 * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
   5 *                         Zhizhou Zhang <etouzh@gmail.com>
   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
  21#include "qemu/osdep.h"
  22#include "cpu.h"
  23#include "exec/helper-proto.h"
  24
  25#define TO_SPR(group, number) (((group) << 11) + (number))
  26
  27void HELPER(mtspr)(CPUOpenRISCState *env,
  28                   target_ulong ra, target_ulong rb, target_ulong offset)
  29{
  30#ifndef CONFIG_USER_ONLY
  31    int spr = (ra | offset);
  32    int idx;
  33
  34    OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
  35    CPUState *cs = CPU(cpu);
  36
  37    switch (spr) {
  38    case TO_SPR(0, 0): /* VR */
  39        env->vr = rb;
  40        break;
  41
  42    case TO_SPR(0, 16): /* NPC */
  43        env->npc = rb;
  44        break;
  45
  46    case TO_SPR(0, 17): /* SR */
  47        if ((env->sr & (SR_IME | SR_DME | SR_SM)) ^
  48            (rb & (SR_IME | SR_DME | SR_SM))) {
  49            tlb_flush(cs, 1);
  50        }
  51        env->sr = rb;
  52        env->sr |= SR_FO;      /* FO is const equal to 1 */
  53        if (env->sr & SR_DME) {
  54            env->tlb->cpu_openrisc_map_address_data =
  55                &cpu_openrisc_get_phys_data;
  56        } else {
  57            env->tlb->cpu_openrisc_map_address_data =
  58                &cpu_openrisc_get_phys_nommu;
  59        }
  60
  61        if (env->sr & SR_IME) {
  62            env->tlb->cpu_openrisc_map_address_code =
  63                &cpu_openrisc_get_phys_code;
  64        } else {
  65            env->tlb->cpu_openrisc_map_address_code =
  66                &cpu_openrisc_get_phys_nommu;
  67        }
  68        break;
  69
  70    case TO_SPR(0, 18): /* PPC */
  71        env->ppc = rb;
  72        break;
  73
  74    case TO_SPR(0, 32): /* EPCR */
  75        env->epcr = rb;
  76        break;
  77
  78    case TO_SPR(0, 48): /* EEAR */
  79        env->eear = rb;
  80        break;
  81
  82    case TO_SPR(0, 64): /* ESR */
  83        env->esr = rb;
  84        break;
  85    case TO_SPR(1, 512) ... TO_SPR(1, 512+DTLB_SIZE-1): /* DTLBW0MR 0-127 */
  86        idx = spr - TO_SPR(1, 512);
  87        if (!(rb & 1)) {
  88            tlb_flush_page(cs, env->tlb->dtlb[0][idx].mr & TARGET_PAGE_MASK);
  89        }
  90        env->tlb->dtlb[0][idx].mr = rb;
  91        break;
  92
  93    case TO_SPR(1, 640) ... TO_SPR(1, 640+DTLB_SIZE-1): /* DTLBW0TR 0-127 */
  94        idx = spr - TO_SPR(1, 640);
  95        env->tlb->dtlb[0][idx].tr = rb;
  96        break;
  97    case TO_SPR(1, 768) ... TO_SPR(1, 895):   /* DTLBW1MR 0-127 */
  98    case TO_SPR(1, 896) ... TO_SPR(1, 1023):  /* DTLBW1TR 0-127 */
  99    case TO_SPR(1, 1024) ... TO_SPR(1, 1151): /* DTLBW2MR 0-127 */
 100    case TO_SPR(1, 1152) ... TO_SPR(1, 1279): /* DTLBW2TR 0-127 */
 101    case TO_SPR(1, 1280) ... TO_SPR(1, 1407): /* DTLBW3MR 0-127 */
 102    case TO_SPR(1, 1408) ... TO_SPR(1, 1535): /* DTLBW3TR 0-127 */
 103        break;
 104    case TO_SPR(2, 512) ... TO_SPR(2, 512+ITLB_SIZE-1):   /* ITLBW0MR 0-127 */
 105        idx = spr - TO_SPR(2, 512);
 106        if (!(rb & 1)) {
 107            tlb_flush_page(cs, env->tlb->itlb[0][idx].mr & TARGET_PAGE_MASK);
 108        }
 109        env->tlb->itlb[0][idx].mr = rb;
 110        break;
 111
 112    case TO_SPR(2, 640) ... TO_SPR(2, 640+ITLB_SIZE-1): /* ITLBW0TR 0-127 */
 113        idx = spr - TO_SPR(2, 640);
 114        env->tlb->itlb[0][idx].tr = rb;
 115        break;
 116    case TO_SPR(2, 768) ... TO_SPR(2, 895):   /* ITLBW1MR 0-127 */
 117    case TO_SPR(2, 896) ... TO_SPR(2, 1023):  /* ITLBW1TR 0-127 */
 118    case TO_SPR(2, 1024) ... TO_SPR(2, 1151): /* ITLBW2MR 0-127 */
 119    case TO_SPR(2, 1152) ... TO_SPR(2, 1279): /* ITLBW2TR 0-127 */
 120    case TO_SPR(2, 1280) ... TO_SPR(2, 1407): /* ITLBW3MR 0-127 */
 121    case TO_SPR(2, 1408) ... TO_SPR(2, 1535): /* ITLBW3TR 0-127 */
 122        break;
 123    case TO_SPR(9, 0):  /* PICMR */
 124        env->picmr |= rb;
 125        break;
 126    case TO_SPR(9, 2):  /* PICSR */
 127        env->picsr &= ~rb;
 128        break;
 129    case TO_SPR(10, 0): /* TTMR */
 130        {
 131            if ((env->ttmr & TTMR_M) ^ (rb & TTMR_M)) {
 132                switch (rb & TTMR_M) {
 133                case TIMER_NONE:
 134                    cpu_openrisc_count_stop(cpu);
 135                    break;
 136                case TIMER_INTR:
 137                case TIMER_SHOT:
 138                case TIMER_CONT:
 139                    cpu_openrisc_count_start(cpu);
 140                    break;
 141                default:
 142                    break;
 143                }
 144            }
 145
 146            int ip = env->ttmr & TTMR_IP;
 147
 148            if (rb & TTMR_IP) {    /* Keep IP bit.  */
 149                env->ttmr = (rb & ~TTMR_IP) | ip;
 150            } else {    /* Clear IP bit.  */
 151                env->ttmr = rb & ~TTMR_IP;
 152                cs->interrupt_request &= ~CPU_INTERRUPT_TIMER;
 153            }
 154
 155            cpu_openrisc_timer_update(cpu);
 156        }
 157        break;
 158
 159    case TO_SPR(10, 1): /* TTCR */
 160        env->ttcr = rb;
 161        if (env->ttmr & TIMER_NONE) {
 162            return;
 163        }
 164        cpu_openrisc_timer_update(cpu);
 165        break;
 166    default:
 167
 168        break;
 169    }
 170#endif
 171}
 172
 173target_ulong HELPER(mfspr)(CPUOpenRISCState *env,
 174                           target_ulong rd, target_ulong ra, uint32_t offset)
 175{
 176#ifndef CONFIG_USER_ONLY
 177    int spr = (ra | offset);
 178    int idx;
 179
 180    OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
 181
 182    switch (spr) {
 183    case TO_SPR(0, 0): /* VR */
 184        return env->vr & SPR_VR;
 185
 186    case TO_SPR(0, 1): /* UPR */
 187        return env->upr;    /* TT, DM, IM, UP present */
 188
 189    case TO_SPR(0, 2): /* CPUCFGR */
 190        return env->cpucfgr;
 191
 192    case TO_SPR(0, 3): /* DMMUCFGR */
 193        return env->dmmucfgr;    /* 1Way, 64 entries */
 194
 195    case TO_SPR(0, 4): /* IMMUCFGR */
 196        return env->immucfgr;
 197
 198    case TO_SPR(0, 16): /* NPC */
 199        return env->npc;
 200
 201    case TO_SPR(0, 17): /* SR */
 202        return env->sr;
 203
 204    case TO_SPR(0, 18): /* PPC */
 205        return env->ppc;
 206
 207    case TO_SPR(0, 32): /* EPCR */
 208        return env->epcr;
 209
 210    case TO_SPR(0, 48): /* EEAR */
 211        return env->eear;
 212
 213    case TO_SPR(0, 64): /* ESR */
 214        return env->esr;
 215
 216    case TO_SPR(1, 512) ... TO_SPR(1, 512+DTLB_SIZE-1): /* DTLBW0MR 0-127 */
 217        idx = spr - TO_SPR(1, 512);
 218        return env->tlb->dtlb[0][idx].mr;
 219
 220    case TO_SPR(1, 640) ... TO_SPR(1, 640+DTLB_SIZE-1): /* DTLBW0TR 0-127 */
 221        idx = spr - TO_SPR(1, 640);
 222        return env->tlb->dtlb[0][idx].tr;
 223
 224    case TO_SPR(1, 768) ... TO_SPR(1, 895):   /* DTLBW1MR 0-127 */
 225    case TO_SPR(1, 896) ... TO_SPR(1, 1023):  /* DTLBW1TR 0-127 */
 226    case TO_SPR(1, 1024) ... TO_SPR(1, 1151): /* DTLBW2MR 0-127 */
 227    case TO_SPR(1, 1152) ... TO_SPR(1, 1279): /* DTLBW2TR 0-127 */
 228    case TO_SPR(1, 1280) ... TO_SPR(1, 1407): /* DTLBW3MR 0-127 */
 229    case TO_SPR(1, 1408) ... TO_SPR(1, 1535): /* DTLBW3TR 0-127 */
 230        break;
 231
 232    case TO_SPR(2, 512) ... TO_SPR(2, 512+ITLB_SIZE-1): /* ITLBW0MR 0-127 */
 233        idx = spr - TO_SPR(2, 512);
 234        return env->tlb->itlb[0][idx].mr;
 235
 236    case TO_SPR(2, 640) ... TO_SPR(2, 640+ITLB_SIZE-1): /* ITLBW0TR 0-127 */
 237        idx = spr - TO_SPR(2, 640);
 238        return env->tlb->itlb[0][idx].tr;
 239
 240    case TO_SPR(2, 768) ... TO_SPR(2, 895):   /* ITLBW1MR 0-127 */
 241    case TO_SPR(2, 896) ... TO_SPR(2, 1023):  /* ITLBW1TR 0-127 */
 242    case TO_SPR(2, 1024) ... TO_SPR(2, 1151): /* ITLBW2MR 0-127 */
 243    case TO_SPR(2, 1152) ... TO_SPR(2, 1279): /* ITLBW2TR 0-127 */
 244    case TO_SPR(2, 1280) ... TO_SPR(2, 1407): /* ITLBW3MR 0-127 */
 245    case TO_SPR(2, 1408) ... TO_SPR(2, 1535): /* ITLBW3TR 0-127 */
 246        break;
 247
 248    case TO_SPR(9, 0):  /* PICMR */
 249        return env->picmr;
 250
 251    case TO_SPR(9, 2):  /* PICSR */
 252        return env->picsr;
 253
 254    case TO_SPR(10, 0): /* TTMR */
 255        return env->ttmr;
 256
 257    case TO_SPR(10, 1): /* TTCR */
 258        cpu_openrisc_count_update(cpu);
 259        return env->ttcr;
 260
 261    default:
 262        break;
 263    }
 264#endif
 265
 266/*If we later need to add tracepoints (or debug printfs) for the return
 267value, it may be useful to structure the code like this:
 268
 269target_ulong ret = 0;
 270
 271switch() {
 272case x:
 273 ret = y;
 274 break;
 275case z:
 276 ret = 42;
 277 break;
 278...
 279}
 280
 281later something like trace_spr_read(ret);
 282
 283return ret;*/
 284
 285    /* for rd is passed in, if rd unchanged, just keep it back.  */
 286    return rd;
 287}
 288