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 #include "tcg/insn-start-words.h"
  30
  31 #define TO_SPR(group, number) (((group) << 11) + (number))
  32
  33 static inline bool is_user(CPUOpenRISCState *env)
  34 {
  35 #ifdef CONFIG_USER_ONLY
  36     return true;
  37 #else
  38     return (env->sr & SR_SM) == 0;
  39 #endif
  40 }
  41
  42 void HELPER(mtspr)(CPUOpenRISCState *env, target_ulong spr, target_ulong rb)
  43 {
  44     OpenRISCCPU *cpu = env_archcpu(env);
  45 #ifndef CONFIG_USER_ONLY
  46     CPUState *cs = env_cpu(env);
  47     target_ulong mr;
  48     int idx;
  49 #endif
  50
  51     /* Handle user accessible SPRs first.  */
  52     switch (spr) {
  53     case TO_SPR(0, 20): /* FPCSR */
  54         cpu_set_fpcsr(env, rb);
  55         return;
  56     }
  57
  58     if (is_user(env)) {
  59         raise_exception(cpu, EXCP_ILLEGAL);
  60     }
  61
  62 #ifndef CONFIG_USER_ONLY
  63     switch (spr) {
  64     case TO_SPR(0, 11): /* EVBAR */
  65         env->evbar = rb;
  66         break;
  67
  68     case TO_SPR(0, 16): /* NPC */
  69         cpu_restore_state(cs, GETPC());
  70         /* ??? Mirror or1ksim in not trashing delayed branch state
  71            when "jumping" to the current instruction.  */
  72         if (env->pc != rb) {
  73             env->pc = rb;
  74             env->dflag = 0;
  75         }
  76         cpu_loop_exit(cs);
  77         break;
  78
  79     case TO_SPR(0, 17): /* SR */
  80         cpu_set_sr(env, rb);
  81         break;
  82
  83     case TO_SPR(0, 32): /* EPCR */
  84         env->epcr = rb;
  85         break;
  86
  87     case TO_SPR(0, 48): /* EEAR */
  88         env->eear = rb;
  89         break;
  90
  91     case TO_SPR(0, 64): /* ESR */
  92         env->esr = rb;
  93         break;
  94
  95     case TO_SPR(0, 1024) ... TO_SPR(0, 1024 + (16 * 32)): /* Shadow GPRs */
  96         idx = (spr - 1024);
  97         env->shadow_gpr[idx / 32][idx % 32] = rb;
  98         break;
  99
 100     case TO_SPR(1, 512) ... TO_SPR(1, 512 + TLB_SIZE - 1): /* DTLBW0MR 0-127 */
 101         idx = spr - TO_SPR(1, 512);
 102         mr = env->tlb.dtlb[idx].mr;
 103         if (mr & 1) {
 104             tlb_flush_page(cs, mr & TARGET_PAGE_MASK);
 105         }
 106         if (rb & 1) {
 107             tlb_flush_page(cs, rb & TARGET_PAGE_MASK);
 108         }
 109         env->tlb.dtlb[idx].mr = rb;
 110         break;
 111     case TO_SPR(1, 640) ... TO_SPR(1, 640 + TLB_SIZE - 1): /* DTLBW0TR 0-127 */
 112         idx = spr - TO_SPR(1, 640);
 113         env->tlb.dtlb[idx].tr = rb;
 114         break;
 115     case TO_SPR(1, 768) ... TO_SPR(1, 895):   /* DTLBW1MR 0-127 */
 116     case TO_SPR(1, 896) ... TO_SPR(1, 1023):  /* DTLBW1TR 0-127 */
 117     case TO_SPR(1, 1024) ... TO_SPR(1, 1151): /* DTLBW2MR 0-127 */
 118     case TO_SPR(1, 1152) ... TO_SPR(1, 1279): /* DTLBW2TR 0-127 */
 119     case TO_SPR(1, 1280) ... TO_SPR(1, 1407): /* DTLBW3MR 0-127 */
 120     case TO_SPR(1, 1408) ... TO_SPR(1, 1535): /* DTLBW3TR 0-127 */
 121         break;
 122
 123     case TO_SPR(2, 512) ... TO_SPR(2, 512 + TLB_SIZE - 1): /* ITLBW0MR 0-127 */
 124         idx = spr - TO_SPR(2, 512);
 125         mr = env->tlb.itlb[idx].mr;
 126         if (mr & 1) {
 127             tlb_flush_page(cs, mr & TARGET_PAGE_MASK);
 128         }
 129         if (rb & 1) {
 130             tlb_flush_page(cs, rb & TARGET_PAGE_MASK);
 131         }
 132         env->tlb.itlb[idx].mr = rb;
 133         break;
 134     case TO_SPR(2, 640) ... TO_SPR(2, 640 + TLB_SIZE - 1): /* ITLBW0TR 0-127 */
 135         idx = spr - TO_SPR(2, 640);
 136         env->tlb.itlb[idx].tr = rb;
 137         break;
 138     case TO_SPR(2, 768) ... TO_SPR(2, 895):   /* ITLBW1MR 0-127 */
 139     case TO_SPR(2, 896) ... TO_SPR(2, 1023):  /* ITLBW1TR 0-127 */
 140     case TO_SPR(2, 1024) ... TO_SPR(2, 1151): /* ITLBW2MR 0-127 */
 141     case TO_SPR(2, 1152) ... TO_SPR(2, 1279): /* ITLBW2TR 0-127 */
 142     case TO_SPR(2, 1280) ... TO_SPR(2, 1407): /* ITLBW3MR 0-127 */
 143     case TO_SPR(2, 1408) ... TO_SPR(2, 1535): /* ITLBW3TR 0-127 */
 144         break;
 145
 146     case TO_SPR(5, 1):  /* MACLO */
 147         env->mac = deposit64(env->mac, 0, 32, rb);
 148         break;
 149     case TO_SPR(5, 2):  /* MACHI */
 150         env->mac = deposit64(env->mac, 32, 32, rb);
 151         break;
 152     case TO_SPR(8, 0):  /* PMR */
 153         env->pmr = rb;
 154         if (env->pmr & PMR_DME || env->pmr & PMR_SME) {
 155             cpu_restore_state(cs, GETPC());
 156             env->pc += 4;
 157             cs->halted = 1;
 158             raise_exception(cpu, EXCP_HALTED);
 159         }
 160         break;
 161     case TO_SPR(9, 0):  /* PICMR */
 162         env->picmr = rb;
 163         bql_lock();
 164         if (env->picsr & env->picmr) {
 165             cpu_interrupt(cs, CPU_INTERRUPT_HARD);
 166         } else {
 167             cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
 168         }
 169         bql_unlock();
 170         break;
 171     case TO_SPR(9, 2):  /* PICSR */
 172         env->picsr &= ~rb;
 173         break;
 174     case TO_SPR(10, 0): /* TTMR */
 175         {
 176             bql_lock();
 177             if ((env->ttmr & TTMR_M) ^ (rb & TTMR_M)) {
 178                 switch (rb & TTMR_M) {
 179                 case TIMER_NONE:
 180                     cpu_openrisc_count_stop(cpu);
 181                     break;
 182                 case TIMER_INTR:
 183                 case TIMER_SHOT:
 184                 case TIMER_CONT:
 185                     cpu_openrisc_count_start(cpu);
 186                     break;
 187                 default:
 188                     break;
 189                 }
 190             }
 191
 192             int ip = env->ttmr & TTMR_IP;
 193
 194             if (rb & TTMR_IP) {    /* Keep IP bit.  */
 195                 env->ttmr = (rb & ~TTMR_IP) | ip;
 196             } else {    /* Clear IP bit.  */
 197                 env->ttmr = rb & ~TTMR_IP;
 198                 cs->interrupt_request &= ~CPU_INTERRUPT_TIMER;
 199             }
 200             cpu_openrisc_timer_update(cpu);
 201             bql_unlock();
 202         }
 203         break;
 204
 205     case TO_SPR(10, 1): /* TTCR */
 206         bql_lock();
 207         cpu_openrisc_count_set(cpu, rb);
 208         cpu_openrisc_timer_update(cpu);
 209         bql_unlock();
 210         break;
 211     }
 212 #endif
 213 }
 214
 215 target_ulong HELPER(mfspr)(CPUOpenRISCState *env, target_ulong rd,
 216                            target_ulong spr)
 217 {
 218     OpenRISCCPU *cpu = env_archcpu(env);
 219 #ifndef CONFIG_USER_ONLY
 220     uint64_t data[TARGET_INSN_START_WORDS];
 221     MachineState *ms = MACHINE(qdev_get_machine());
 222     CPUState *cs = env_cpu(env);
 223     int idx;
 224 #endif
 225
 226     /* Handle user accessible SPRs first.  */
 227     switch (spr) {
 228     case TO_SPR(0, 20): /* FPCSR */
 229         return env->fpcsr;
 230     }
 231
 232     if (is_user(env)) {
 233         raise_exception(cpu, EXCP_ILLEGAL);
 234     }
 235
 236 #ifndef CONFIG_USER_ONLY
 237     switch (spr) {
 238     case TO_SPR(0, 0): /* VR */
 239         return env->vr;
 240
 241     case TO_SPR(0, 1): /* UPR */
 242         return env->upr;
 243
 244     case TO_SPR(0, 2): /* CPUCFGR */
 245         return env->cpucfgr;
 246
 247     case TO_SPR(0, 3): /* DMMUCFGR */
 248         return env->dmmucfgr;
 249
 250     case TO_SPR(0, 4): /* IMMUCFGR */
 251         return env->immucfgr;
 252
 253     case TO_SPR(0, 9): /* VR2 */
 254         return env->vr2;
 255
 256     case TO_SPR(0, 10): /* AVR */
 257         return env->avr;
 258
 259     case TO_SPR(0, 11): /* EVBAR */
 260         return env->evbar;
 261
 262     case TO_SPR(0, 16): /* NPC (equals PC) */
 263         if (cpu_unwind_state_data(cs, GETPC(), data)) {
 264             return data[0];
 265         }
 266         return env->pc;
 267
 268     case TO_SPR(0, 17): /* SR */
 269         return cpu_get_sr(env);
 270
 271     case TO_SPR(0, 18): /* PPC */
 272         if (cpu_unwind_state_data(cs, GETPC(), data)) {
 273             if (data[1] & 2) {
 274                 return data[0] - 4;
 275             }
 276         }
 277         return env->ppc;
 278
 279     case TO_SPR(0, 32): /* EPCR */
 280         return env->epcr;
 281
 282     case TO_SPR(0, 48): /* EEAR */
 283         return env->eear;
 284
 285     case TO_SPR(0, 64): /* ESR */
 286         return env->esr;
 287
 288     case TO_SPR(0, 128): /* COREID */
 289         return cpu->parent_obj.cpu_index;
 290
 291     case TO_SPR(0, 129): /* NUMCORES */
 292         return ms->smp.max_cpus;
 293
 294     case TO_SPR(0, 1024) ... TO_SPR(0, 1024 + (16 * 32)): /* Shadow GPRs */
 295         idx = (spr - 1024);
 296         return env->shadow_gpr[idx / 32][idx % 32];
 297
 298     case TO_SPR(1, 512) ... TO_SPR(1, 512 + TLB_SIZE - 1): /* DTLBW0MR 0-127 */
 299         idx = spr - TO_SPR(1, 512);
 300         return env->tlb.dtlb[idx].mr;
 301
 302     case TO_SPR(1, 640) ... TO_SPR(1, 640 + TLB_SIZE - 1): /* DTLBW0TR 0-127 */
 303         idx = spr - TO_SPR(1, 640);
 304         return env->tlb.dtlb[idx].tr;
 305
 306     case TO_SPR(1, 768) ... TO_SPR(1, 895):   /* DTLBW1MR 0-127 */
 307     case TO_SPR(1, 896) ... TO_SPR(1, 1023):  /* DTLBW1TR 0-127 */
 308     case TO_SPR(1, 1024) ... TO_SPR(1, 1151): /* DTLBW2MR 0-127 */
 309     case TO_SPR(1, 1152) ... TO_SPR(1, 1279): /* DTLBW2TR 0-127 */
 310     case TO_SPR(1, 1280) ... TO_SPR(1, 1407): /* DTLBW3MR 0-127 */
 311     case TO_SPR(1, 1408) ... TO_SPR(1, 1535): /* DTLBW3TR 0-127 */
 312         break;
 313
 314     case TO_SPR(2, 512) ... TO_SPR(2, 512 + TLB_SIZE - 1): /* ITLBW0MR 0-127 */
 315         idx = spr - TO_SPR(2, 512);
 316         return env->tlb.itlb[idx].mr;
 317
 318     case TO_SPR(2, 640) ... TO_SPR(2, 640 + TLB_SIZE - 1): /* ITLBW0TR 0-127 */
 319         idx = spr - TO_SPR(2, 640);
 320         return env->tlb.itlb[idx].tr;
 321
 322     case TO_SPR(2, 768) ... TO_SPR(2, 895):   /* ITLBW1MR 0-127 */
 323     case TO_SPR(2, 896) ... TO_SPR(2, 1023):  /* ITLBW1TR 0-127 */
 324     case TO_SPR(2, 1024) ... TO_SPR(2, 1151): /* ITLBW2MR 0-127 */
 325     case TO_SPR(2, 1152) ... TO_SPR(2, 1279): /* ITLBW2TR 0-127 */
 326     case TO_SPR(2, 1280) ... TO_SPR(2, 1407): /* ITLBW3MR 0-127 */
 327     case TO_SPR(2, 1408) ... TO_SPR(2, 1535): /* ITLBW3TR 0-127 */
 328         break;
 329
 330     case TO_SPR(5, 1):  /* MACLO */
 331         return (uint32_t)env->mac;
 332         break;
 333     case TO_SPR(5, 2):  /* MACHI */
 334         return env->mac >> 32;
 335         break;
 336
 337     case TO_SPR(8, 0):  /* PMR */
 338         return env->pmr;
 339
 340     case TO_SPR(9, 0):  /* PICMR */
 341         return env->picmr;
 342
 343     case TO_SPR(9, 2):  /* PICSR */
 344         return env->picsr;
 345
 346     case TO_SPR(10, 0): /* TTMR */
 347         return env->ttmr;
 348
 349     case TO_SPR(10, 1): /* TTCR */
 350         bql_lock();
 351         cpu_openrisc_count_update(cpu);
 352         bql_unlock();
 353         return cpu_openrisc_count_get(cpu);
 354     }
 355 #endif
 356
 357     /* for rd is passed in, if rd unchanged, just keep it back.  */
 358     return rd;
 359 }