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 "cpu.h"
  27 #include "qemu-common.h"
  28 #include "qemu/timer.h"
  29 #include "qemu/error-report.h"
  30 #include "hw/hw.h"
  31 #include "trace.h"
  32 #ifndef CONFIG_USER_ONLY
  33 #include "sysemu/arch_init.h"
  34 #endif
  35
  36 #define CR0_RESET       0xE0UL
  37 #define CR14_RESET      0xC2000000UL;
  38
  39 /* generate CPU information for cpu -? */
  40 void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
  41 {
  42 #ifdef CONFIG_KVM
  43     (*cpu_fprintf)(f, "s390 %16s\n", "host");
  44 #endif
  45 }
  46
  47 #ifndef CONFIG_USER_ONLY
  48 CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
  49 {
  50     CpuDefinitionInfoList *entry;
  51     CpuDefinitionInfo *info;
  52
  53     info = g_malloc0(sizeof(*info));
  54     info->name = g_strdup("host");
  55
  56     entry = g_malloc0(sizeof(*entry));
  57     entry->value = info;
  58
  59     return entry;
  60 }
  61 #endif
  62
  63 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  64 {
  65     S390CPU *cpu = S390_CPU(cs);
  66
  67     cpu->env.psw.addr = value;
  68 }
  69
  70 static bool s390_cpu_has_work(CPUState *cs)
  71 {
  72     S390CPU *cpu = S390_CPU(cs);
  73     CPUS390XState *env = &cpu->env;
  74
  75     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  76            (env->psw.mask & PSW_MASK_EXT);
  77 }
  78
  79 #if !defined(CONFIG_USER_ONLY)
  80 /* S390CPUClass::load_normal() */
  81 static void s390_cpu_load_normal(CPUState *s)
  82 {
  83     S390CPU *cpu = S390_CPU(s);
  84     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  85     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  86     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  87 }
  88 #endif
  89
  90 /* S390CPUClass::cpu_reset() */
  91 static void s390_cpu_reset(CPUState *s)
  92 {
  93     S390CPU *cpu = S390_CPU(s);
  94     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  95     CPUS390XState *env = &cpu->env;
  96
  97     env->pfault_token = -1UL;
  98     scc->parent_reset(s);
  99     cpu->env.sigp_order = 0;
 100     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 101     tlb_flush(s, 1);
 102 }
 103
 104 /* S390CPUClass::initial_reset() */
 105 static void s390_cpu_initial_reset(CPUState *s)
 106 {
 107     S390CPU *cpu = S390_CPU(s);
 108     CPUS390XState *env = &cpu->env;
 109     int i;
 110
 111     s390_cpu_reset(s);
 112     /* initial reset does not touch regs,fregs and aregs */
 113     memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
 114                          offsetof(CPUS390XState, fpc));
 115
 116     /* architectured initial values for CR 0 and 14 */
 117     env->cregs[0] = CR0_RESET;
 118     env->cregs[14] = CR14_RESET;
 119
 120     /* architectured initial value for Breaking-Event-Address register */
 121     env->gbea = 1;
 122
 123     env->pfault_token = -1UL;
 124     env->ext_index = -1;
 125     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 126         env->io_index[i] = -1;
 127     }
 128
 129     /* tininess for underflow is detected before rounding */
 130     set_float_detect_tininess(float_tininess_before_rounding,
 131                               &env->fpu_status);
 132
 133     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 134     if (kvm_enabled()) {
 135         kvm_s390_reset_vcpu(cpu);
 136     }
 137     tlb_flush(s, 1);
 138 }
 139
 140 /* CPUClass:reset() */
 141 static void s390_cpu_full_reset(CPUState *s)
 142 {
 143     S390CPU *cpu = S390_CPU(s);
 144     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 145     CPUS390XState *env = &cpu->env;
 146     int i;
 147
 148     scc->parent_reset(s);
 149     cpu->env.sigp_order = 0;
 150     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 151
 152     memset(env, 0, offsetof(CPUS390XState, cpu_num));
 153
 154     /* architectured initial values for CR 0 and 14 */
 155     env->cregs[0] = CR0_RESET;
 156     env->cregs[14] = CR14_RESET;
 157
 158     /* architectured initial value for Breaking-Event-Address register */
 159     env->gbea = 1;
 160
 161     env->pfault_token = -1UL;
 162     env->ext_index = -1;
 163     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 164         env->io_index[i] = -1;
 165     }
 166
 167     /* tininess for underflow is detected before rounding */
 168     set_float_detect_tininess(float_tininess_before_rounding,
 169                               &env->fpu_status);
 170
 171     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 172     if (kvm_enabled()) {
 173         kvm_s390_reset_vcpu(cpu);
 174     }
 175     tlb_flush(s, 1);
 176 }
 177
 178 #if !defined(CONFIG_USER_ONLY)
 179 static void s390_cpu_machine_reset_cb(void *opaque)
 180 {
 181     S390CPU *cpu = opaque;
 182
 183     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, CPU(cpu));
 184 }
 185 #endif
 186
 187 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 188 {
 189     info->mach = bfd_mach_s390_64;
 190     info->print_insn = print_insn_s390;
 191 }
 192
 193 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 194 {
 195     CPUState *cs = CPU(dev);
 196     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 197
 198     s390_cpu_gdb_init(cs);
 199     qemu_init_vcpu(cs);
 200 #if !defined(CONFIG_USER_ONLY)
 201     run_on_cpu(cs, s390_do_cpu_full_reset, cs);
 202 #else
 203     cpu_reset(cs);
 204 #endif
 205
 206     scc->parent_realize(dev, errp);
 207 }
 208
 209 static void s390_cpu_initfn(Object *obj)
 210 {
 211     CPUState *cs = CPU(obj);
 212     S390CPU *cpu = S390_CPU(obj);
 213     CPUS390XState *env = &cpu->env;
 214     static bool inited;
 215     static int cpu_num = 0;
 216 #if !defined(CONFIG_USER_ONLY)
 217     struct tm tm;
 218 #endif
 219
 220     cs->env_ptr = env;
 221     cpu_exec_init(cs, &error_abort);
 222 #if !defined(CONFIG_USER_ONLY)
 223     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 224     qemu_get_timedate(&tm, 0);
 225     env->tod_offset = TOD_UNIX_EPOCH +
 226                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 227     env->tod_basetime = 0;
 228     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 229     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 230     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 231 #endif
 232     env->cpu_num = cpu_num++;
 233
 234     if (tcg_enabled() && !inited) {
 235         inited = true;
 236         s390x_translate_init();
 237     }
 238 }
 239
 240 static void s390_cpu_finalize(Object *obj)
 241 {
 242 #if !defined(CONFIG_USER_ONLY)
 243     S390CPU *cpu = S390_CPU(obj);
 244
 245     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 246     g_free(cpu->irqstate);
 247 #endif
 248 }
 249
 250 #if !defined(CONFIG_USER_ONLY)
 251 static bool disabled_wait(CPUState *cpu)
 252 {
 253     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 254                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 255 }
 256
 257 static unsigned s390_count_running_cpus(void)
 258 {
 259     CPUState *cpu;
 260     int nr_running = 0;
 261
 262     CPU_FOREACH(cpu) {
 263         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 264         if (state == CPU_STATE_OPERATING ||
 265             state == CPU_STATE_LOAD) {
 266             if (!disabled_wait(cpu)) {
 267                 nr_running++;
 268             }
 269         }
 270     }
 271
 272     return nr_running;
 273 }
 274
 275 unsigned int s390_cpu_halt(S390CPU *cpu)
 276 {
 277     CPUState *cs = CPU(cpu);
 278     trace_cpu_halt(cs->cpu_index);
 279
 280     if (!cs->halted) {
 281         cs->halted = 1;
 282         cs->exception_index = EXCP_HLT;
 283     }
 284
 285     return s390_count_running_cpus();
 286 }
 287
 288 void s390_cpu_unhalt(S390CPU *cpu)
 289 {
 290     CPUState *cs = CPU(cpu);
 291     trace_cpu_unhalt(cs->cpu_index);
 292
 293     if (cs->halted) {
 294         cs->halted = 0;
 295         cs->exception_index = -1;
 296     }
 297 }
 298
 299 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 300  {
 301     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 302
 303     switch (cpu_state) {
 304     case CPU_STATE_STOPPED:
 305     case CPU_STATE_CHECK_STOP:
 306         /* halt the cpu for common infrastructure */
 307         s390_cpu_halt(cpu);
 308         break;
 309     case CPU_STATE_OPERATING:
 310     case CPU_STATE_LOAD:
 311         /* unhalt the cpu for common infrastructure */
 312         s390_cpu_unhalt(cpu);
 313         break;
 314     default:
 315         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 316                      cpu_state);
 317         exit(1);
 318     }
 319     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 320         kvm_s390_set_cpu_state(cpu, cpu_state);
 321     }
 322     cpu->env.cpu_state = cpu_state;
 323
 324     return s390_count_running_cpus();
 325 }
 326 #endif
 327
 328 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 329 {
 330     S390CPUClass *scc = S390_CPU_CLASS(oc);
 331     CPUClass *cc = CPU_CLASS(scc);
 332     DeviceClass *dc = DEVICE_CLASS(oc);
 333
 334     scc->parent_realize = dc->realize;
 335     dc->realize = s390_cpu_realizefn;
 336
 337     scc->parent_reset = cc->reset;
 338 #if !defined(CONFIG_USER_ONLY)
 339     scc->load_normal = s390_cpu_load_normal;
 340 #endif
 341     scc->cpu_reset = s390_cpu_reset;
 342     scc->initial_cpu_reset = s390_cpu_initial_reset;
 343     cc->reset = s390_cpu_full_reset;
 344     cc->has_work = s390_cpu_has_work;
 345     cc->do_interrupt = s390_cpu_do_interrupt;
 346     cc->dump_state = s390_cpu_dump_state;
 347     cc->set_pc = s390_cpu_set_pc;
 348     cc->gdb_read_register = s390_cpu_gdb_read_register;
 349     cc->gdb_write_register = s390_cpu_gdb_write_register;
 350 #ifdef CONFIG_USER_ONLY
 351     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 352 #else
 353     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 354     cc->vmsd = &vmstate_s390_cpu;
 355     cc->write_elf64_note = s390_cpu_write_elf64_note;
 356     cc->write_elf64_qemunote = s390_cpu_write_elf64_qemunote;
 357     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 358     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 359 #endif
 360     cc->disas_set_info = s390_cpu_disas_set_info;
 361
 362     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 363     cc->gdb_core_xml_file = "s390x-core64.xml";
 364
 365     /*
 366      * Reason: s390_cpu_initfn() calls cpu_exec_init(), which saves
 367      * the object in cpus -> dangling pointer after final
 368      * object_unref().
 369      */
 370     dc->cannot_destroy_with_object_finalize_yet = true;
 371 }
 372
 373 static const TypeInfo s390_cpu_type_info = {
 374     .name = TYPE_S390_CPU,
 375     .parent = TYPE_CPU,
 376     .instance_size = sizeof(S390CPU),
 377     .instance_init = s390_cpu_initfn,
 378     .instance_finalize = s390_cpu_finalize,
 379     .abstract = false,
 380     .class_size = sizeof(S390CPUClass),
 381     .class_init = s390_cpu_class_init,
 382 };
 383
 384 static void s390_cpu_register_types(void)
 385 {
 386     type_register_static(&s390_cpu_type_info);
 387 }
 388
 389 type_init(s390_cpu_register_types)