target/openrisc/sys_helper.c

   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 2.1 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/exec-all.h"
  24 #include "exec/helper-proto.h"
  25 #include "exception.h"
  26 #ifndef CONFIG_USER_ONLY
  27 #include "hw/boards.h"
  28 #endif
  29
  30 #define TO_SPR(group, number) (((group) << 11) + (number))
  31
  32 void HELPER(mtspr)(CPUOpenRISCState *env, target_ulong spr, target_ulong rb)
  33 {
  34 #ifndef CONFIG_USER_ONLY
  35     OpenRISCCPU *cpu = env_archcpu(env);
  36     CPUState *cs = env_cpu(env);
  37     target_ulong mr;
  38     int idx;
  39 #endif
  40
  41     switch (spr) {
  42 #ifndef CONFIG_USER_ONLY
  43     case TO_SPR(0, 11): /* EVBAR */
  44         env->evbar = rb;
  45         break;
  46
  47     case TO_SPR(0, 16): /* NPC */
  48         cpu_restore_state(cs, GETPC(), true);
  49         /* ??? Mirror or1ksim in not trashing delayed branch state
  50            when "jumping" to the current instruction.  */
  51         if (env->pc != rb) {
  52             env->pc = rb;
  53             env->dflag = 0;
  54             cpu_loop_exit(cs);
  55         }
  56         break;
  57
  58     case TO_SPR(0, 17): /* SR */
  59         cpu_set_sr(env, rb);
  60         break;
  61
  62     case TO_SPR(0, 32): /* EPCR */
  63         env->epcr = rb;
  64         break;
  65
  66     case TO_SPR(0, 48): /* EEAR */
  67         env->eear = rb;
  68         break;
  69
  70     case TO_SPR(0, 64): /* ESR */
  71         env->esr = rb;
  72         break;
  73
  74     case TO_SPR(0, 1024) ... TO_SPR(0, 1024 + (16 * 32)): /* Shadow GPRs */
  75         idx = (spr - 1024);
  76         env->shadow_gpr[idx / 32][idx % 32] = rb;
  77         break;
  78
  79     case TO_SPR(1, 512) ... TO_SPR(1, 512 + TLB_SIZE - 1): /* DTLBW0MR 0-127 */
  80         idx = spr - TO_SPR(1, 512);
  81         mr = env->tlb.dtlb[idx].mr;
  82         if (mr & 1) {
  83             tlb_flush_page(cs, mr & TARGET_PAGE_MASK);
  84         }
  85         if (rb & 1) {
  86             tlb_flush_page(cs, rb & TARGET_PAGE_MASK);
  87         }
  88         env->tlb.dtlb[idx].mr = rb;
  89         break;
  90     case TO_SPR(1, 640) ... TO_SPR(1, 640 + TLB_SIZE - 1): /* DTLBW0TR 0-127 */
  91         idx = spr - TO_SPR(1, 640);
  92         env->tlb.dtlb[idx].tr = rb;
  93         break;
  94     case TO_SPR(1, 768) ... TO_SPR(1, 895):   /* DTLBW1MR 0-127 */
  95     case TO_SPR(1, 896) ... TO_SPR(1, 1023):  /* DTLBW1TR 0-127 */
  96     case TO_SPR(1, 1024) ... TO_SPR(1, 1151): /* DTLBW2MR 0-127 */
  97     case TO_SPR(1, 1152) ... TO_SPR(1, 1279): /* DTLBW2TR 0-127 */
  98     case TO_SPR(1, 1280) ... TO_SPR(1, 1407): /* DTLBW3MR 0-127 */
  99     case TO_SPR(1, 1408) ... TO_SPR(1, 1535): /* DTLBW3TR 0-127 */
 100         break;
 101
 102     case TO_SPR(2, 512) ... TO_SPR(2, 512 + TLB_SIZE - 1): /* ITLBW0MR 0-127 */
 103         idx = spr - TO_SPR(2, 512);
 104         mr = env->tlb.itlb[idx].mr;
 105         if (mr & 1) {
 106             tlb_flush_page(cs, mr & TARGET_PAGE_MASK);
 107         }
 108         if (rb & 1) {
 109             tlb_flush_page(cs, rb & TARGET_PAGE_MASK);
 110         }
 111         env->tlb.itlb[idx].mr = rb;
 112         break;
 113     case TO_SPR(2, 640) ... TO_SPR(2, 640 + TLB_SIZE - 1): /* ITLBW0TR 0-127 */
 114         idx = spr - TO_SPR(2, 640);
 115         env->tlb.itlb[idx].tr = rb;
 116         break;
 117     case TO_SPR(2, 768) ... TO_SPR(2, 895):   /* ITLBW1MR 0-127 */
 118     case TO_SPR(2, 896) ... TO_SPR(2, 1023):  /* ITLBW1TR 0-127 */
 119     case TO_SPR(2, 1024) ... TO_SPR(2, 1151): /* ITLBW2MR 0-127 */
 120     case TO_SPR(2, 1152) ... TO_SPR(2, 1279): /* ITLBW2TR 0-127 */
 121     case TO_SPR(2, 1280) ... TO_SPR(2, 1407): /* ITLBW3MR 0-127 */
 122     case TO_SPR(2, 1408) ... TO_SPR(2, 1535): /* ITLBW3TR 0-127 */
 123         break;
 124
 125     case TO_SPR(5, 1):  /* MACLO */
 126         env->mac = deposit64(env->mac, 0, 32, rb);
 127         break;
 128     case TO_SPR(5, 2):  /* MACHI */
 129         env->mac = deposit64(env->mac, 32, 32, rb);
 130         break;
 131     case TO_SPR(8, 0):  /* PMR */
 132         env->pmr = rb;
 133         if (env->pmr & PMR_DME || env->pmr & PMR_SME) {
 134             cpu_restore_state(cs, GETPC(), true);
 135             env->pc += 4;
 136             cs->halted = 1;
 137             raise_exception(cpu, EXCP_HALTED);
 138         }
 139         break;
 140     case TO_SPR(9, 0):  /* PICMR */
 141         env->picmr = rb;
 142         break;
 143     case TO_SPR(9, 2):  /* PICSR */
 144         env->picsr &= ~rb;
 145         break;
 146     case TO_SPR(10, 0): /* TTMR */
 147         {
 148             if ((env->ttmr & TTMR_M) ^ (rb & TTMR_M)) {
 149                 switch (rb & TTMR_M) {
 150                 case TIMER_NONE:
 151                     cpu_openrisc_count_stop(cpu);
 152                     break;
 153                 case TIMER_INTR:
 154                 case TIMER_SHOT:
 155                 case TIMER_CONT:
 156                     cpu_openrisc_count_start(cpu);
 157                     break;
 158                 default:
 159                     break;
 160                 }
 161             }
 162
 163             int ip = env->ttmr & TTMR_IP;
 164
 165             if (rb & TTMR_IP) {    /* Keep IP bit.  */
 166                 env->ttmr = (rb & ~TTMR_IP) | ip;
 167             } else {    /* Clear IP bit.  */
 168                 env->ttmr = rb & ~TTMR_IP;
 169                 cs->interrupt_request &= ~CPU_INTERRUPT_TIMER;
 170             }
 171
 172             cpu_openrisc_timer_update(cpu);
 173         }
 174         break;
 175
 176     case TO_SPR(10, 1): /* TTCR */
 177         cpu_openrisc_count_set(cpu, rb);
 178         cpu_openrisc_timer_update(cpu);
 179         break;
 180 #endif
 181
 182     case TO_SPR(0, 20): /* FPCSR */
 183         cpu_set_fpcsr(env, rb);
 184         break;
 185     }
 186 }
 187
 188 target_ulong HELPER(mfspr)(CPUOpenRISCState *env, target_ulong rd,
 189                            target_ulong spr)
 190 {
 191 #ifndef CONFIG_USER_ONLY
 192     MachineState *ms = MACHINE(qdev_get_machine());
 193     OpenRISCCPU *cpu = env_archcpu(env);
 194     CPUState *cs = env_cpu(env);
 195     int idx;
 196 #endif
 197
 198     switch (spr) {
 199 #ifndef CONFIG_USER_ONLY
 200     case TO_SPR(0, 0): /* VR */
 201         return env->vr;
 202
 203     case TO_SPR(0, 1): /* UPR */
 204         return env->upr;
 205
 206     case TO_SPR(0, 2): /* CPUCFGR */
 207         return env->cpucfgr;
 208
 209     case TO_SPR(0, 3): /* DMMUCFGR */
 210         return env->dmmucfgr;
 211
 212     case TO_SPR(0, 4): /* IMMUCFGR */
 213         return env->immucfgr;
 214
 215     case TO_SPR(0, 9): /* VR2 */
 216         return env->vr2;
 217
 218     case TO_SPR(0, 10): /* AVR */
 219         return env->avr;
 220
 221     case TO_SPR(0, 11): /* EVBAR */
 222         return env->evbar;
 223
 224     case TO_SPR(0, 16): /* NPC (equals PC) */
 225         cpu_restore_state(cs, GETPC(), false);
 226         return env->pc;
 227
 228     case TO_SPR(0, 17): /* SR */
 229         return cpu_get_sr(env);
 230
 231     case TO_SPR(0, 18): /* PPC */
 232         cpu_restore_state(cs, GETPC(), false);
 233         return env->ppc;
 234
 235     case TO_SPR(0, 32): /* EPCR */
 236         return env->epcr;
 237
 238     case TO_SPR(0, 48): /* EEAR */
 239         return env->eear;
 240
 241     case TO_SPR(0, 64): /* ESR */
 242         return env->esr;
 243
 244     case TO_SPR(0, 128): /* COREID */
 245         return cpu->parent_obj.cpu_index;
 246
 247     case TO_SPR(0, 129): /* NUMCORES */
 248         return ms->smp.max_cpus;
 249
 250     case TO_SPR(0, 1024) ... TO_SPR(0, 1024 + (16 * 32)): /* Shadow GPRs */
 251         idx = (spr - 1024);
 252         return env->shadow_gpr[idx / 32][idx % 32];
 253
 254     case TO_SPR(1, 512) ... TO_SPR(1, 512 + TLB_SIZE - 1): /* DTLBW0MR 0-127 */
 255         idx = spr - TO_SPR(1, 512);
 256         return env->tlb.dtlb[idx].mr;
 257
 258     case TO_SPR(1, 640) ... TO_SPR(1, 640 + TLB_SIZE - 1): /* DTLBW0TR 0-127 */
 259         idx = spr - TO_SPR(1, 640);
 260         return env->tlb.dtlb[idx].tr;
 261
 262     case TO_SPR(1, 768) ... TO_SPR(1, 895):   /* DTLBW1MR 0-127 */
 263     case TO_SPR(1, 896) ... TO_SPR(1, 1023):  /* DTLBW1TR 0-127 */
 264     case TO_SPR(1, 1024) ... TO_SPR(1, 1151): /* DTLBW2MR 0-127 */
 265     case TO_SPR(1, 1152) ... TO_SPR(1, 1279): /* DTLBW2TR 0-127 */
 266     case TO_SPR(1, 1280) ... TO_SPR(1, 1407): /* DTLBW3MR 0-127 */
 267     case TO_SPR(1, 1408) ... TO_SPR(1, 1535): /* DTLBW3TR 0-127 */
 268         break;
 269
 270     case TO_SPR(2, 512) ... TO_SPR(2, 512 + TLB_SIZE - 1): /* ITLBW0MR 0-127 */
 271         idx = spr - TO_SPR(2, 512);
 272         return env->tlb.itlb[idx].mr;
 273
 274     case TO_SPR(2, 640) ... TO_SPR(2, 640 + TLB_SIZE - 1): /* ITLBW0TR 0-127 */
 275         idx = spr - TO_SPR(2, 640);
 276         return env->tlb.itlb[idx].tr;
 277
 278     case TO_SPR(2, 768) ... TO_SPR(2, 895):   /* ITLBW1MR 0-127 */
 279     case TO_SPR(2, 896) ... TO_SPR(2, 1023):  /* ITLBW1TR 0-127 */
 280     case TO_SPR(2, 1024) ... TO_SPR(2, 1151): /* ITLBW2MR 0-127 */
 281     case TO_SPR(2, 1152) ... TO_SPR(2, 1279): /* ITLBW2TR 0-127 */
 282     case TO_SPR(2, 1280) ... TO_SPR(2, 1407): /* ITLBW3MR 0-127 */
 283     case TO_SPR(2, 1408) ... TO_SPR(2, 1535): /* ITLBW3TR 0-127 */
 284         break;
 285
 286     case TO_SPR(5, 1):  /* MACLO */
 287         return (uint32_t)env->mac;
 288         break;
 289     case TO_SPR(5, 2):  /* MACHI */
 290         return env->mac >> 32;
 291         break;
 292
 293     case TO_SPR(8, 0):  /* PMR */
 294         return env->pmr;
 295
 296     case TO_SPR(9, 0):  /* PICMR */
 297         return env->picmr;
 298
 299     case TO_SPR(9, 2):  /* PICSR */
 300         return env->picsr;
 301
 302     case TO_SPR(10, 0): /* TTMR */
 303         return env->ttmr;
 304
 305     case TO_SPR(10, 1): /* TTCR */
 306         cpu_openrisc_count_update(cpu);
 307         return cpu_openrisc_count_get(cpu);
 308 #endif
 309
 310     case TO_SPR(0, 20): /* FPCSR */
 311         return env->fpcsr;
 312     }
 313
 314     /* for rd is passed in, if rd unchanged, just keep it back.  */
 315     return rd;
 316 }