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/sysemu.h"
  35 #endif
  36
  37 /* #define DEBUG_HELPER */
  38 #ifdef DEBUG_HELPER
  39 #define HELPER_LOG(x...) qemu_log(x)
  40 #else
  41 #define HELPER_LOG(x...)
  42 #endif
  43
  44 /* Raise an exception dynamically from a helper function.  */
  45 void QEMU_NORETURN runtime_exception(CPUS390XState *env, int excp,
  46                                      uintptr_t retaddr)
  47 {
  48     int t;
  49
  50     env->exception_index = EXCP_PGM;
  51     env->int_pgm_code = excp;
  52
  53     /* Use the (ultimate) callers address to find the insn that trapped.  */
  54     cpu_restore_state(env, retaddr);
  55
  56     /* Advance past the insn.  */
  57     t = cpu_ldub_code(env, env->psw.addr);
  58     env->int_pgm_ilen = t = get_ilen(t);
  59     env->psw.addr += 2 * t;
  60
  61     cpu_loop_exit(env);
  62 }
  63
  64 /* Raise an exception statically from a TB.  */
  65 void HELPER(exception)(CPUS390XState *env, uint32_t excp)
  66 {
  67     HELPER_LOG("%s: exception %d\n", __func__, excp);
  68     env->exception_index = excp;
  69     cpu_loop_exit(env);
  70 }
  71
  72 #ifndef CONFIG_USER_ONLY
  73 void program_interrupt(CPUS390XState *env, uint32_t code, int ilen)
  74 {
  75     qemu_log_mask(CPU_LOG_INT, "program interrupt at %#" PRIx64 "\n",
  76                   env->psw.addr);
  77
  78     if (kvm_enabled()) {
  79 #ifdef CONFIG_KVM
  80         kvm_s390_interrupt(s390_env_get_cpu(env), KVM_S390_PROGRAM_INT, code);
  81 #endif
  82     } else {
  83         env->int_pgm_code = code;
  84         env->int_pgm_ilen = ilen;
  85         env->exception_index = EXCP_PGM;
  86         cpu_loop_exit(env);
  87     }
  88 }
  89
  90 /* SCLP service call */
  91 uint32_t HELPER(servc)(CPUS390XState *env, uint32_t r1, uint64_t r2)
  92 {
  93     int r;
  94
  95     r = sclp_service_call(r1, r2);
  96     if (r < 0) {
  97         program_interrupt(env, -r, 4);
  98         return 0;
  99     }
 100     return r;
 101 }
 102
 103 /* DIAG */
 104 uint64_t HELPER(diag)(CPUS390XState *env, uint32_t num, uint64_t mem,
 105                       uint64_t code)
 106 {
 107     uint64_t r;
 108
 109     switch (num) {
 110     case 0x500:
 111         /* KVM hypercall */
 112         r = s390_virtio_hypercall(env, mem, code);
 113         break;
 114     case 0x44:
 115         /* yield */
 116         r = 0;
 117         break;
 118     case 0x308:
 119         /* ipl */
 120         r = 0;
 121         break;
 122     default:
 123         r = -1;
 124         break;
 125     }
 126
 127     if (r) {
 128         program_interrupt(env, PGM_OPERATION, ILEN_LATER_INC);
 129     }
 130
 131     return r;
 132 }
 133
 134 /* Set Prefix */
 135 void HELPER(spx)(CPUS390XState *env, uint64_t a1)
 136 {
 137     uint32_t prefix = a1 & 0x7fffe000;
 138     env->psa = prefix;
 139     qemu_log("prefix: %#x\n", prefix);
 140     tlb_flush_page(env, 0);
 141     tlb_flush_page(env, TARGET_PAGE_SIZE);
 142 }
 143
 144 static inline uint64_t clock_value(CPUS390XState *env)
 145 {
 146     uint64_t time;
 147
 148     time = env->tod_offset +
 149         time2tod(qemu_get_clock_ns(vm_clock) - env->tod_basetime);
 150
 151     return time;
 152 }
 153
 154 /* Store Clock */
 155 uint64_t HELPER(stck)(CPUS390XState *env)
 156 {
 157     return clock_value(env);
 158 }
 159
 160 /* Store Clock Extended */
 161 uint32_t HELPER(stcke)(CPUS390XState *env, uint64_t a1)
 162 {
 163     cpu_stb_data(env, a1, 0);
 164     /* basically the same value as stck */
 165     cpu_stq_data(env, a1 + 1, clock_value(env) | env->cpu_num);
 166     /* more fine grained than stck */
 167     cpu_stq_data(env, a1 + 9, 0);
 168     /* XXX programmable fields */
 169     cpu_stw_data(env, a1 + 17, 0);
 170
 171     return 0;
 172 }
 173
 174 /* Set Clock Comparator */
 175 void HELPER(sckc)(CPUS390XState *env, uint64_t time)
 176 {
 177     if (time == -1ULL) {
 178         return;
 179     }
 180
 181     /* difference between now and then */
 182     time -= clock_value(env);
 183     /* nanoseconds */
 184     time = (time * 125) >> 9;
 185
 186     qemu_mod_timer(env->tod_timer, qemu_get_clock_ns(vm_clock) + time);
 187 }
 188
 189 /* Store Clock Comparator */
 190 uint64_t HELPER(stckc)(CPUS390XState *env)
 191 {
 192     /* XXX implement */
 193     return 0;
 194 }
 195
 196 /* Set CPU Timer */
 197 void HELPER(spt)(CPUS390XState *env, uint64_t time)
 198 {
 199     if (time == -1ULL) {
 200         return;
 201     }
 202
 203     /* nanoseconds */
 204     time = (time * 125) >> 9;
 205
 206     qemu_mod_timer(env->cpu_timer, qemu_get_clock_ns(vm_clock) + time);
 207 }
 208
 209 /* Store CPU Timer */
 210 uint64_t HELPER(stpt)(CPUS390XState *env)
 211 {
 212     /* XXX implement */
 213     return 0;
 214 }
 215
 216 /* Store System Information */
 217 uint32_t HELPER(stsi)(CPUS390XState *env, uint64_t a0, uint32_t r0,
 218                       uint32_t r1)
 219 {
 220     int cc = 0;
 221     int sel1, sel2;
 222
 223     if ((r0 & STSI_LEVEL_MASK) <= STSI_LEVEL_3 &&
 224         ((r0 & STSI_R0_RESERVED_MASK) || (r1 & STSI_R1_RESERVED_MASK))) {
 225         /* valid function code, invalid reserved bits */
 226         program_interrupt(env, PGM_SPECIFICATION, 2);
 227     }
 228
 229     sel1 = r0 & STSI_R0_SEL1_MASK;
 230     sel2 = r1 & STSI_R1_SEL2_MASK;
 231
 232     /* XXX: spec exception if sysib is not 4k-aligned */
 233
 234     switch (r0 & STSI_LEVEL_MASK) {
 235     case STSI_LEVEL_1:
 236         if ((sel1 == 1) && (sel2 == 1)) {
 237             /* Basic Machine Configuration */
 238             struct sysib_111 sysib;
 239
 240             memset(&sysib, 0, sizeof(sysib));
 241             ebcdic_put(sysib.manuf, "QEMU            ", 16);
 242             /* same as machine type number in STORE CPU ID */
 243             ebcdic_put(sysib.type, "QEMU", 4);
 244             /* same as model number in STORE CPU ID */
 245             ebcdic_put(sysib.model, "QEMU            ", 16);
 246             ebcdic_put(sysib.sequence, "QEMU            ", 16);
 247             ebcdic_put(sysib.plant, "QEMU", 4);
 248             cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 249         } else if ((sel1 == 2) && (sel2 == 1)) {
 250             /* Basic Machine CPU */
 251             struct sysib_121 sysib;
 252
 253             memset(&sysib, 0, sizeof(sysib));
 254             /* XXX make different for different CPUs? */
 255             ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 256             ebcdic_put(sysib.plant, "QEMU", 4);
 257             stw_p(&sysib.cpu_addr, env->cpu_num);
 258             cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 259         } else if ((sel1 == 2) && (sel2 == 2)) {
 260             /* Basic Machine CPUs */
 261             struct sysib_122 sysib;
 262
 263             memset(&sysib, 0, sizeof(sysib));
 264             stl_p(&sysib.capability, 0x443afc29);
 265             /* XXX change when SMP comes */
 266             stw_p(&sysib.total_cpus, 1);
 267             stw_p(&sysib.active_cpus, 1);
 268             stw_p(&sysib.standby_cpus, 0);
 269             stw_p(&sysib.reserved_cpus, 0);
 270             cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 271         } else {
 272             cc = 3;
 273         }
 274         break;
 275     case STSI_LEVEL_2:
 276         {
 277             if ((sel1 == 2) && (sel2 == 1)) {
 278                 /* LPAR CPU */
 279                 struct sysib_221 sysib;
 280
 281                 memset(&sysib, 0, sizeof(sysib));
 282                 /* XXX make different for different CPUs? */
 283                 ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 284                 ebcdic_put(sysib.plant, "QEMU", 4);
 285                 stw_p(&sysib.cpu_addr, env->cpu_num);
 286                 stw_p(&sysib.cpu_id, 0);
 287                 cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 288             } else if ((sel1 == 2) && (sel2 == 2)) {
 289                 /* LPAR CPUs */
 290                 struct sysib_222 sysib;
 291
 292                 memset(&sysib, 0, sizeof(sysib));
 293                 stw_p(&sysib.lpar_num, 0);
 294                 sysib.lcpuc = 0;
 295                 /* XXX change when SMP comes */
 296                 stw_p(&sysib.total_cpus, 1);
 297                 stw_p(&sysib.conf_cpus, 1);
 298                 stw_p(&sysib.standby_cpus, 0);
 299                 stw_p(&sysib.reserved_cpus, 0);
 300                 ebcdic_put(sysib.name, "QEMU    ", 8);
 301                 stl_p(&sysib.caf, 1000);
 302                 stw_p(&sysib.dedicated_cpus, 0);
 303                 stw_p(&sysib.shared_cpus, 0);
 304                 cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 305             } else {
 306                 cc = 3;
 307             }
 308             break;
 309         }
 310     case STSI_LEVEL_3:
 311         {
 312             if ((sel1 == 2) && (sel2 == 2)) {
 313                 /* VM CPUs */
 314                 struct sysib_322 sysib;
 315
 316                 memset(&sysib, 0, sizeof(sysib));
 317                 sysib.count = 1;
 318                 /* XXX change when SMP comes */
 319                 stw_p(&sysib.vm[0].total_cpus, 1);
 320                 stw_p(&sysib.vm[0].conf_cpus, 1);
 321                 stw_p(&sysib.vm[0].standby_cpus, 0);
 322                 stw_p(&sysib.vm[0].reserved_cpus, 0);
 323                 ebcdic_put(sysib.vm[0].name, "KVMguest", 8);
 324                 stl_p(&sysib.vm[0].caf, 1000);
 325                 ebcdic_put(sysib.vm[0].cpi, "KVM/Linux       ", 16);
 326                 cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);
 327             } else {
 328                 cc = 3;
 329             }
 330             break;
 331         }
 332     case STSI_LEVEL_CURRENT:
 333         env->regs[0] = STSI_LEVEL_3;
 334         break;
 335     default:
 336         cc = 3;
 337         break;
 338     }
 339
 340     return cc;
 341 }
 342
 343 uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
 344                       uint64_t cpu_addr)
 345 {
 346     int cc = 0;
 347
 348     HELPER_LOG("%s: %016" PRIx64 " %08x %016" PRIx64 "\n",
 349                __func__, order_code, r1, cpu_addr);
 350
 351     /* Remember: Use "R1 or R1 + 1, whichever is the odd-numbered register"
 352        as parameter (input). Status (output) is always R1. */
 353
 354     switch (order_code) {
 355     case SIGP_SET_ARCH:
 356         /* switch arch */
 357         break;
 358     case SIGP_SENSE:
 359         /* enumerate CPU status */
 360         if (cpu_addr) {
 361             /* XXX implement when SMP comes */
 362             return 3;
 363         }
 364         env->regs[r1] &= 0xffffffff00000000ULL;
 365         cc = 1;
 366         break;
 367 #if !defined(CONFIG_USER_ONLY)
 368     case SIGP_RESTART:
 369         qemu_system_reset_request();
 370         cpu_loop_exit(env);
 371         break;
 372     case SIGP_STOP:
 373         qemu_system_shutdown_request();
 374         cpu_loop_exit(env);
 375         break;
 376 #endif
 377     default:
 378         /* unknown sigp */
 379         fprintf(stderr, "XXX unknown sigp: 0x%" PRIx64 "\n", order_code);
 380         cc = 3;
 381     }
 382
 383     return cc;
 384 }
 385 #endif