target-s390x/cpu.c

   1 /*
   2  * QEMU S/390 CPU
   3  *
   4  * Copyright (c) 2009 Ulrich Hecht
   5  * Copyright (c) 2011 Alexander Graf
   6  * Copyright (c) 2012 SUSE LINUX Products GmbH
   7  * Copyright (c) 2012 IBM Corp.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, see
  21  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  22  * Contributions after 2012-12-11 are licensed under the terms of the
  23  * GNU GPL, version 2 or (at your option) any later version.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "cpu.h"
  28 #include "qemu-common.h"
  29 #include "qemu/timer.h"
  30 #include "qemu/error-report.h"
  31 #include "hw/hw.h"
  32 #include "trace.h"
  33 #ifndef CONFIG_USER_ONLY
  34 #include "sysemu/arch_init.h"
  35 #endif
  36
  37 #define CR0_RESET       0xE0UL
  38 #define CR14_RESET      0xC2000000UL;
  39
  40 /* generate CPU information for cpu -? */
  41 void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
  42 {
  43 #ifdef CONFIG_KVM
  44     (*cpu_fprintf)(f, "s390 %16s\n", "host");
  45 #endif
  46 }
  47
  48 #ifndef CONFIG_USER_ONLY
  49 CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
  50 {
  51     CpuDefinitionInfoList *entry;
  52     CpuDefinitionInfo *info;
  53
  54     info = g_malloc0(sizeof(*info));
  55     info->name = g_strdup("host");
  56
  57     entry = g_malloc0(sizeof(*entry));
  58     entry->value = info;
  59
  60     return entry;
  61 }
  62 #endif
  63
  64 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  65 {
  66     S390CPU *cpu = S390_CPU(cs);
  67
  68     cpu->env.psw.addr = value;
  69 }
  70
  71 static bool s390_cpu_has_work(CPUState *cs)
  72 {
  73     S390CPU *cpu = S390_CPU(cs);
  74     CPUS390XState *env = &cpu->env;
  75
  76     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  77            (env->psw.mask & PSW_MASK_EXT);
  78 }
  79
  80 #if !defined(CONFIG_USER_ONLY)
  81 /* S390CPUClass::load_normal() */
  82 static void s390_cpu_load_normal(CPUState *s)
  83 {
  84     S390CPU *cpu = S390_CPU(s);
  85     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  86     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  87     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  88 }
  89 #endif
  90
  91 /* S390CPUClass::cpu_reset() */
  92 static void s390_cpu_reset(CPUState *s)
  93 {
  94     S390CPU *cpu = S390_CPU(s);
  95     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  96     CPUS390XState *env = &cpu->env;
  97
  98     env->pfault_token = -1UL;
  99     scc->parent_reset(s);
 100     cpu->env.sigp_order = 0;
 101     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 102     tlb_flush(s, 1);
 103 }
 104
 105 /* S390CPUClass::initial_reset() */
 106 static void s390_cpu_initial_reset(CPUState *s)
 107 {
 108     S390CPU *cpu = S390_CPU(s);
 109     CPUS390XState *env = &cpu->env;
 110     int i;
 111
 112     s390_cpu_reset(s);
 113     /* initial reset does not touch regs,fregs and aregs */
 114     memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
 115                          offsetof(CPUS390XState, fpc));
 116
 117     /* architectured initial values for CR 0 and 14 */
 118     env->cregs[0] = CR0_RESET;
 119     env->cregs[14] = CR14_RESET;
 120
 121     /* architectured initial value for Breaking-Event-Address register */
 122     env->gbea = 1;
 123
 124     env->pfault_token = -1UL;
 125     env->ext_index = -1;
 126     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 127         env->io_index[i] = -1;
 128     }
 129
 130     /* tininess for underflow is detected before rounding */
 131     set_float_detect_tininess(float_tininess_before_rounding,
 132                               &env->fpu_status);
 133
 134     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 135     if (kvm_enabled()) {
 136         kvm_s390_reset_vcpu(cpu);
 137     }
 138     tlb_flush(s, 1);
 139 }
 140
 141 /* CPUClass:reset() */
 142 static void s390_cpu_full_reset(CPUState *s)
 143 {
 144     S390CPU *cpu = S390_CPU(s);
 145     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 146     CPUS390XState *env = &cpu->env;
 147     int i;
 148
 149     scc->parent_reset(s);
 150     cpu->env.sigp_order = 0;
 151     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 152
 153     memset(env, 0, offsetof(CPUS390XState, cpu_num));
 154
 155     /* architectured initial values for CR 0 and 14 */
 156     env->cregs[0] = CR0_RESET;
 157     env->cregs[14] = CR14_RESET;
 158
 159     /* architectured initial value for Breaking-Event-Address register */
 160     env->gbea = 1;
 161
 162     env->pfault_token = -1UL;
 163     env->ext_index = -1;
 164     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 165         env->io_index[i] = -1;
 166     }
 167
 168     /* tininess for underflow is detected before rounding */
 169     set_float_detect_tininess(float_tininess_before_rounding,
 170                               &env->fpu_status);
 171
 172     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 173     if (kvm_enabled()) {
 174         kvm_s390_reset_vcpu(cpu);
 175     }
 176     tlb_flush(s, 1);
 177 }
 178
 179 #if !defined(CONFIG_USER_ONLY)
 180 static void s390_cpu_machine_reset_cb(void *opaque)
 181 {
 182     S390CPU *cpu = opaque;
 183
 184     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, CPU(cpu));
 185 }
 186 #endif
 187
 188 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 189 {
 190     info->mach = bfd_mach_s390_64;
 191     info->print_insn = print_insn_s390;
 192 }
 193
 194 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 195 {
 196     CPUState *cs = CPU(dev);
 197     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 198
 199     s390_cpu_gdb_init(cs);
 200     qemu_init_vcpu(cs);
 201 #if !defined(CONFIG_USER_ONLY)
 202     run_on_cpu(cs, s390_do_cpu_full_reset, cs);
 203 #else
 204     cpu_reset(cs);
 205 #endif
 206
 207     scc->parent_realize(dev, errp);
 208 }
 209
 210 static void s390_cpu_initfn(Object *obj)
 211 {
 212     CPUState *cs = CPU(obj);
 213     S390CPU *cpu = S390_CPU(obj);
 214     CPUS390XState *env = &cpu->env;
 215     static bool inited;
 216     static int cpu_num = 0;
 217 #if !defined(CONFIG_USER_ONLY)
 218     struct tm tm;
 219 #endif
 220
 221     cs->env_ptr = env;
 222     cpu_exec_init(cs, &error_abort);
 223 #if !defined(CONFIG_USER_ONLY)
 224     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 225     qemu_get_timedate(&tm, 0);
 226     env->tod_offset = TOD_UNIX_EPOCH +
 227                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 228     env->tod_basetime = 0;
 229     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 230     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 231     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 232 #endif
 233     env->cpu_num = cpu_num++;
 234
 235     if (tcg_enabled() && !inited) {
 236         inited = true;
 237         s390x_translate_init();
 238     }
 239 }
 240
 241 static void s390_cpu_finalize(Object *obj)
 242 {
 243 #if !defined(CONFIG_USER_ONLY)
 244     S390CPU *cpu = S390_CPU(obj);
 245
 246     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 247     g_free(cpu->irqstate);
 248 #endif
 249 }
 250
 251 #if !defined(CONFIG_USER_ONLY)
 252 static bool disabled_wait(CPUState *cpu)
 253 {
 254     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 255                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 256 }
 257
 258 static unsigned s390_count_running_cpus(void)
 259 {
 260     CPUState *cpu;
 261     int nr_running = 0;
 262
 263     CPU_FOREACH(cpu) {
 264         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 265         if (state == CPU_STATE_OPERATING ||
 266             state == CPU_STATE_LOAD) {
 267             if (!disabled_wait(cpu)) {
 268                 nr_running++;
 269             }
 270         }
 271     }
 272
 273     return nr_running;
 274 }
 275
 276 unsigned int s390_cpu_halt(S390CPU *cpu)
 277 {
 278     CPUState *cs = CPU(cpu);
 279     trace_cpu_halt(cs->cpu_index);
 280
 281     if (!cs->halted) {
 282         cs->halted = 1;
 283         cs->exception_index = EXCP_HLT;
 284     }
 285
 286     return s390_count_running_cpus();
 287 }
 288
 289 void s390_cpu_unhalt(S390CPU *cpu)
 290 {
 291     CPUState *cs = CPU(cpu);
 292     trace_cpu_unhalt(cs->cpu_index);
 293
 294     if (cs->halted) {
 295         cs->halted = 0;
 296         cs->exception_index = -1;
 297     }
 298 }
 299
 300 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 301  {
 302     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 303
 304     switch (cpu_state) {
 305     case CPU_STATE_STOPPED:
 306     case CPU_STATE_CHECK_STOP:
 307         /* halt the cpu for common infrastructure */
 308         s390_cpu_halt(cpu);
 309         break;
 310     case CPU_STATE_OPERATING:
 311     case CPU_STATE_LOAD:
 312         /* unhalt the cpu for common infrastructure */
 313         s390_cpu_unhalt(cpu);
 314         break;
 315     default:
 316         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 317                      cpu_state);
 318         exit(1);
 319     }
 320     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 321         kvm_s390_set_cpu_state(cpu, cpu_state);
 322     }
 323     cpu->env.cpu_state = cpu_state;
 324
 325     return s390_count_running_cpus();
 326 }
 327 #endif
 328
 329 static gchar *s390_gdb_arch_name(CPUState *cs)
 330 {
 331     return g_strdup("s390:64-bit");
 332 }
 333
 334 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 335 {
 336     S390CPUClass *scc = S390_CPU_CLASS(oc);
 337     CPUClass *cc = CPU_CLASS(scc);
 338     DeviceClass *dc = DEVICE_CLASS(oc);
 339
 340     scc->parent_realize = dc->realize;
 341     dc->realize = s390_cpu_realizefn;
 342
 343     scc->parent_reset = cc->reset;
 344 #if !defined(CONFIG_USER_ONLY)
 345     scc->load_normal = s390_cpu_load_normal;
 346 #endif
 347     scc->cpu_reset = s390_cpu_reset;
 348     scc->initial_cpu_reset = s390_cpu_initial_reset;
 349     cc->reset = s390_cpu_full_reset;
 350     cc->has_work = s390_cpu_has_work;
 351     cc->do_interrupt = s390_cpu_do_interrupt;
 352     cc->dump_state = s390_cpu_dump_state;
 353     cc->set_pc = s390_cpu_set_pc;
 354     cc->gdb_read_register = s390_cpu_gdb_read_register;
 355     cc->gdb_write_register = s390_cpu_gdb_write_register;
 356 #ifdef CONFIG_USER_ONLY
 357     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 358 #else
 359     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 360     cc->vmsd = &vmstate_s390_cpu;
 361     cc->write_elf64_note = s390_cpu_write_elf64_note;
 362     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 363     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 364 #endif
 365     cc->disas_set_info = s390_cpu_disas_set_info;
 366
 367     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 368     cc->gdb_core_xml_file = "s390x-core64.xml";
 369     cc->gdb_arch_name = s390_gdb_arch_name;
 370
 371     /*
 372      * Reason: s390_cpu_initfn() calls cpu_exec_init(), which saves
 373      * the object in cpus -> dangling pointer after final
 374      * object_unref().
 375      */
 376     dc->cannot_destroy_with_object_finalize_yet = true;
 377 }
 378
 379 static const TypeInfo s390_cpu_type_info = {
 380     .name = TYPE_S390_CPU,
 381     .parent = TYPE_CPU,
 382     .instance_size = sizeof(S390CPU),
 383     .instance_init = s390_cpu_initfn,
 384     .instance_finalize = s390_cpu_finalize,
 385     .abstract = false,
 386     .class_size = sizeof(S390CPUClass),
 387     .class_init = s390_cpu_class_init,
 388 };
 389
 390 static void s390_cpu_register_types(void)
 391 {
 392     type_register_static(&s390_cpu_type_info);
 393 }
 394
 395 type_init(s390_cpu_register_types)