target-s390x/misc_helper.c

   1 /*
   2  *  S/390 misc helper routines
   3  *
   4  *  Copyright (c) 2009 Ulrich Hecht
   5  *  Copyright (c) 2009 Alexander Graf
   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 "cpu.h"
  22 #include "exec/memory.h"
  23 #include "qemu/host-utils.h"
  24 #include "helper.h"
  25 #include <string.h>
  26 #include "sysemu/kvm.h"
  27 #include "qemu/timer.h"
  28 #ifdef CONFIG_KVM
  29 #include <linux/kvm.h>
  30 #endif
  31
  32 #if !defined(CONFIG_USER_ONLY)
  33 #include "exec/softmmu_exec.h"
  34 #include "sysemu/cpus.h"
  35 #include "sysemu/sysemu.h"
  36 #include "hw/s390x/ebcdic.h"
  37 #endif
  38
  39 /* #define DEBUG_HELPER */
  40 #ifdef DEBUG_HELPER
  41 #define HELPER_LOG(x...) qemu_log(x)
  42 #else
  43 #define HELPER_LOG(x...)
  44 #endif
  45
  46 /* Raise an exception dynamically from a helper function.  */
  47 void QEMU_NORETURN runtime_exception(CPUS390XState *env, int excp,
  48                                      uintptr_t retaddr)
  49 {
  50     int t;
  51
  52     env->exception_index = EXCP_PGM;
  53     env->int_pgm_code = excp;
  54
  55     /* Use the (ultimate) callers address to find the insn that trapped.  */
  56     cpu_restore_state(env, retaddr);
  57
  58     /* Advance past the insn.  */
  59     t = cpu_ldub_code(env, env->psw.addr);
  60     env->int_pgm_ilen = t = get_ilen(t);
  61     env->psw.addr += 2 * t;
  62
  63     cpu_loop_exit(env);
  64 }
  65
  66 /* Raise an exception statically from a TB.  */
  67 void HELPER(exception)(CPUS390XState *env, uint32_t excp)
  68 {
  69     HELPER_LOG("%s: exception %d\n", __func__, excp);
  70     env->exception_index = excp;
  71     cpu_loop_exit(env);
  72 }
  73
  74 #ifndef CONFIG_USER_ONLY
  75
  76 void program_interrupt(CPUS390XState *env, uint32_t code, int ilen)
  77 {
  78     qemu_log_mask(CPU_LOG_INT, "program interrupt at %#" PRIx64 "\n",
  79                   env->psw.addr);
  80
  81     if (kvm_enabled()) {
  82 #ifdef CONFIG_KVM
  83         kvm_s390_interrupt(s390_env_get_cpu(env), KVM_S390_PROGRAM_INT, code);
  84 #endif
  85     } else {
  86         env->int_pgm_code = code;
  87         env->int_pgm_ilen = ilen;
  88         env->exception_index = EXCP_PGM;
  89         cpu_loop_exit(env);
  90     }
  91 }
  92
  93 /* SCLP service call */
  94 uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
  95 {
  96     int r = sclp_service_call(r1, r2);
  97     if (r < 0) {
  98         program_interrupt(env, -r, 4);
  99         return 0;
 100     }
 101     return r;
 102 }
 103
 104 #ifndef CONFIG_USER_ONLY
 105 static void cpu_reset_all(void)
 106 {
 107     CPUState *cs;
 108     S390CPUClass *scc;
 109
 110     CPU_FOREACH(cs) {
 111         scc = S390_CPU_GET_CLASS(cs);
 112         scc->cpu_reset(cs);
 113     }
 114 }
 115
 116 static void cpu_full_reset_all(void)
 117 {
 118     CPUState *cpu;
 119
 120     CPU_FOREACH(cpu) {
 121         cpu_reset(cpu);
 122     }
 123 }
 124
 125 static int modified_clear_reset(S390CPU *cpu)
 126 {
 127     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 128
 129     pause_all_vcpus();
 130     cpu_synchronize_all_states();
 131     cpu_full_reset_all();
 132     io_subsystem_reset();
 133     scc->load_normal(CPU(cpu));
 134     cpu_synchronize_all_post_reset();
 135     resume_all_vcpus();
 136     return 0;
 137 }
 138
 139 static int load_normal_reset(S390CPU *cpu)
 140 {
 141     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 142
 143     pause_all_vcpus();
 144     cpu_synchronize_all_states();
 145     cpu_reset_all();
 146     io_subsystem_reset();
 147     scc->initial_cpu_reset(CPU(cpu));
 148     scc->load_normal(CPU(cpu));
 149     cpu_synchronize_all_post_reset();
 150     resume_all_vcpus();
 151     return 0;
 152 }
 153
 154 #define DIAG_308_RC_NO_CONF         0x0102
 155 #define DIAG_308_RC_INVALID         0x0402
 156 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3)
 157 {
 158     uint64_t addr =  env->regs[r1];
 159     uint64_t subcode = env->regs[r3];
 160
 161     if (env->psw.mask & PSW_MASK_PSTATE) {
 162         program_interrupt(env, PGM_PRIVILEGED, ILEN_LATER_INC);
 163         return;
 164     }
 165
 166     if ((subcode & ~0x0ffffULL) || (subcode > 6)) {
 167         program_interrupt(env, PGM_SPECIFICATION, ILEN_LATER_INC);
 168         return;
 169     }
 170
 171     switch (subcode) {
 172     case 0:
 173         modified_clear_reset(s390_env_get_cpu(env));
 174         break;
 175     case 1:
 176         load_normal_reset(s390_env_get_cpu(env));
 177         break;
 178     case 5:
 179         if ((r1 & 1) || (addr & 0x0fffULL)) {
 180             program_interrupt(env, PGM_SPECIFICATION, ILEN_LATER_INC);
 181             return;
 182         }
 183         env->regs[r1+1] = DIAG_308_RC_INVALID;
 184         return;
 185     case 6:
 186         if ((r1 & 1) || (addr & 0x0fffULL)) {
 187             program_interrupt(env, PGM_SPECIFICATION, ILEN_LATER_INC);
 188             return;
 189         }
 190         env->regs[r1+1] = DIAG_308_RC_NO_CONF;
 191         return;
 192     default:
 193         hw_error("Unhandled diag308 subcode %" PRIx64, subcode);
 194         break;
 195     }
 196 }
 197 #endif
 198
 199 /* DIAG */
 200 uint64_t HELPER(diag)(CPUS390XState *env, uint32_t num, uint64_t mem,
 201                       uint64_t code)
 202 {
 203     uint64_t r;
 204
 205     switch (num) {
 206     case 0x500:
 207         /* KVM hypercall */
 208         r = s390_virtio_hypercall(env);
 209         break;
 210     case 0x44:
 211         /* yield */
 212         r = 0;
 213         break;
 214     case 0x308:
 215         /* ipl */
 216         r = 0;
 217         break;
 218     default:
 219         r = -1;
 220         break;
 221     }
 222
 223     if (r) {
 224         program_interrupt(env, PGM_OPERATION, ILEN_LATER_INC);
 225     }
 226
 227     return r;
 228 }
 229
 230 /* Set Prefix */
 231 void HELPER(spx)(CPUS390XState *env, uint64_t a1)
 232 {
 233     uint32_t prefix = a1 & 0x7fffe000;
 234     env->psa = prefix;
 235     qemu_log("prefix: %#x\n", prefix);
 236     tlb_flush_page(env, 0);
 237     tlb_flush_page(env, TARGET_PAGE_SIZE);
 238 }
 239
 240 static inline uint64_t clock_value(CPUS390XState *env)
 241 {
 242     uint64_t time;
 243
 244     time = env->tod_offset +
 245         time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - env->tod_basetime);
 246
 247     return time;
 248 }
 249
 250 /* Store Clock */
 251 uint64_t HELPER(stck)(CPUS390XState *env)
 252 {
 253     return clock_value(env);
 254 }
 255
 256 /* Set Clock Comparator */
 257 void HELPER(sckc)(CPUS390XState *env, uint64_t time)
 258 {
 259     if (time == -1ULL) {
 260         return;
 261     }
 262
 263     /* difference between now and then */
 264     time -= clock_value(env);
 265     /* nanoseconds */
 266     time = (time * 125) >> 9;
 267
 268     timer_mod(env->tod_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + time);
 269 }
 270
 271 /* Store Clock Comparator */
 272 uint64_t HELPER(stckc)(CPUS390XState *env)
 273 {
 274     /* XXX implement */
 275     return 0;
 276 }
 277
 278 /* Set CPU Timer */
 279 void HELPER(spt)(CPUS390XState *env, uint64_t time)
 280 {
 281     if (time == -1ULL) {
 282         return;
 283     }
 284
 285     /* nanoseconds */
 286     time = (time * 125) >> 9;
 287
 288     timer_mod(env->cpu_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + time);
 289 }
 290
 291 /* Store CPU Timer */
 292 uint64_t HELPER(stpt)(CPUS390XState *env)
 293 {
 294     /* XXX implement */
 295     return 0;
 296 }
 297
 298 /* Store System Information */
 299 uint32_t HELPER(stsi)(CPUS390XState *env, uint64_t a0,
 300                       uint64_t r0, uint64_t r1)
 301 {
 302     int cc = 0;
 303     int sel1, sel2;
 304
 305     if ((r0 & STSI_LEVEL_MASK) <= STSI_LEVEL_3 &&
 306         ((r0 & STSI_R0_RESERVED_MASK) || (r1 & STSI_R1_RESERVED_MASK))) {
 307         /* valid function code, invalid reserved bits */
 308         program_interrupt(env, PGM_SPECIFICATION, 2);
 309     }
 310
 311     sel1 = r0 & STSI_R0_SEL1_MASK;
 312     sel2 = r1 & STSI_R1_SEL2_MASK;
 313
 314     /* XXX: spec exception if sysib is not 4k-aligned */
 315
 316     switch (r0 & STSI_LEVEL_MASK) {
 317     case STSI_LEVEL_1:
 318         if ((sel1 == 1) && (sel2 == 1)) {
 319             /* Basic Machine Configuration */
 320             struct sysib_111 sysib;
 321
 322             memset(&sysib, 0, sizeof(sysib));
 323             ebcdic_put(sysib.manuf, "QEMU            ", 16);
 324             /* same as machine type number in STORE CPU ID */
 325             ebcdic_put(sysib.type, "QEMU", 4);
 326             /* same as model number in STORE CPU ID */
 327             ebcdic_put(sysib.model, "QEMU            ", 16);
 328             ebcdic_put(sysib.sequence, "QEMU            ", 16);
 329             ebcdic_put(sysib.plant, "QEMU", 4);
 330             cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 331         } else if ((sel1 == 2) && (sel2 == 1)) {
 332             /* Basic Machine CPU */
 333             struct sysib_121 sysib;
 334
 335             memset(&sysib, 0, sizeof(sysib));
 336             /* XXX make different for different CPUs? */
 337             ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 338             ebcdic_put(sysib.plant, "QEMU", 4);
 339             stw_p(&sysib.cpu_addr, env->cpu_num);
 340             cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 341         } else if ((sel1 == 2) && (sel2 == 2)) {
 342             /* Basic Machine CPUs */
 343             struct sysib_122 sysib;
 344
 345             memset(&sysib, 0, sizeof(sysib));
 346             stl_p(&sysib.capability, 0x443afc29);
 347             /* XXX change when SMP comes */
 348             stw_p(&sysib.total_cpus, 1);
 349             stw_p(&sysib.active_cpus, 1);
 350             stw_p(&sysib.standby_cpus, 0);
 351             stw_p(&sysib.reserved_cpus, 0);
 352             cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 353         } else {
 354             cc = 3;
 355         }
 356         break;
 357     case STSI_LEVEL_2:
 358         {
 359             if ((sel1 == 2) && (sel2 == 1)) {
 360                 /* LPAR CPU */
 361                 struct sysib_221 sysib;
 362
 363                 memset(&sysib, 0, sizeof(sysib));
 364                 /* XXX make different for different CPUs? */
 365                 ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 366                 ebcdic_put(sysib.plant, "QEMU", 4);
 367                 stw_p(&sysib.cpu_addr, env->cpu_num);
 368                 stw_p(&sysib.cpu_id, 0);
 369                 cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 370             } else if ((sel1 == 2) && (sel2 == 2)) {
 371                 /* LPAR CPUs */
 372                 struct sysib_222 sysib;
 373
 374                 memset(&sysib, 0, sizeof(sysib));
 375                 stw_p(&sysib.lpar_num, 0);
 376                 sysib.lcpuc = 0;
 377                 /* XXX change when SMP comes */
 378                 stw_p(&sysib.total_cpus, 1);
 379                 stw_p(&sysib.conf_cpus, 1);
 380                 stw_p(&sysib.standby_cpus, 0);
 381                 stw_p(&sysib.reserved_cpus, 0);
 382                 ebcdic_put(sysib.name, "QEMU    ", 8);
 383                 stl_p(&sysib.caf, 1000);
 384                 stw_p(&sysib.dedicated_cpus, 0);
 385                 stw_p(&sysib.shared_cpus, 0);
 386                 cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 387             } else {
 388                 cc = 3;
 389             }
 390             break;
 391         }
 392     case STSI_LEVEL_3:
 393         {
 394             if ((sel1 == 2) && (sel2 == 2)) {
 395                 /* VM CPUs */
 396                 struct sysib_322 sysib;
 397
 398                 memset(&sysib, 0, sizeof(sysib));
 399                 sysib.count = 1;
 400                 /* XXX change when SMP comes */
 401                 stw_p(&sysib.vm[0].total_cpus, 1);
 402                 stw_p(&sysib.vm[0].conf_cpus, 1);
 403                 stw_p(&sysib.vm[0].standby_cpus, 0);
 404                 stw_p(&sysib.vm[0].reserved_cpus, 0);
 405                 ebcdic_put(sysib.vm[0].name, "KVMguest", 8);
 406                 stl_p(&sysib.vm[0].caf, 1000);
 407                 ebcdic_put(sysib.vm[0].cpi, "KVM/Linux       ", 16);
 408                 cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 409             } else {
 410                 cc = 3;
 411             }
 412             break;
 413         }
 414     case STSI_LEVEL_CURRENT:
 415         env->regs[0] = STSI_LEVEL_3;
 416         break;
 417     default:
 418         cc = 3;
 419         break;
 420     }
 421
 422     return cc;
 423 }
 424
 425 uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
 426                       uint64_t cpu_addr)
 427 {
 428     int cc = 0;
 429
 430     HELPER_LOG("%s: %016" PRIx64 " %08x %016" PRIx64 "\n",
 431                __func__, order_code, r1, cpu_addr);
 432
 433     /* Remember: Use "R1 or R1 + 1, whichever is the odd-numbered register"
 434        as parameter (input). Status (output) is always R1. */
 435
 436     switch (order_code) {
 437     case SIGP_SET_ARCH:
 438         /* switch arch */
 439         break;
 440     case SIGP_SENSE:
 441         /* enumerate CPU status */
 442         if (cpu_addr) {
 443             /* XXX implement when SMP comes */
 444             return 3;
 445         }
 446         env->regs[r1] &= 0xffffffff00000000ULL;
 447         cc = 1;
 448         break;
 449 #if !defined(CONFIG_USER_ONLY)
 450     case SIGP_RESTART:
 451         qemu_system_reset_request();
 452         cpu_loop_exit(env);
 453         break;
 454     case SIGP_STOP:
 455         qemu_system_shutdown_request();
 456         cpu_loop_exit(env);
 457         break;
 458 #endif
 459     default:
 460         /* unknown sigp */
 461         fprintf(stderr, "XXX unknown sigp: 0x%" PRIx64 "\n", order_code);
 462         cc = 3;
 463     }
 464
 465     return cc;
 466 }
 467 #endif