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
 110     s390_cpu_reset(s);
 111     /* initial reset does not touch regs,fregs and aregs */
 112     memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
 113                          offsetof(CPUS390XState, fpc));
 114
 115     /* architectured initial values for CR 0 and 14 */
 116     env->cregs[0] = CR0_RESET;
 117     env->cregs[14] = CR14_RESET;
 118
 119     env->pfault_token = -1UL;
 120
 121     /* tininess for underflow is detected before rounding */
 122     set_float_detect_tininess(float_tininess_before_rounding,
 123                               &env->fpu_status);
 124
 125     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 126     if (kvm_enabled()) {
 127         kvm_s390_reset_vcpu(cpu);
 128     }
 129 }
 130
 131 /* CPUClass:reset() */
 132 static void s390_cpu_full_reset(CPUState *s)
 133 {
 134     S390CPU *cpu = S390_CPU(s);
 135     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 136     CPUS390XState *env = &cpu->env;
 137
 138     scc->parent_reset(s);
 139     cpu->env.sigp_order = 0;
 140     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 141
 142     memset(env, 0, offsetof(CPUS390XState, cpu_num));
 143
 144     /* architectured initial values for CR 0 and 14 */
 145     env->cregs[0] = CR0_RESET;
 146     env->cregs[14] = CR14_RESET;
 147
 148     env->pfault_token = -1UL;
 149
 150     /* tininess for underflow is detected before rounding */
 151     set_float_detect_tininess(float_tininess_before_rounding,
 152                               &env->fpu_status);
 153
 154     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 155     if (kvm_enabled()) {
 156         kvm_s390_reset_vcpu(cpu);
 157     }
 158     tlb_flush(s, 1);
 159 }
 160
 161 #if !defined(CONFIG_USER_ONLY)
 162 static void s390_cpu_machine_reset_cb(void *opaque)
 163 {
 164     S390CPU *cpu = opaque;
 165
 166     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, CPU(cpu));
 167 }
 168 #endif
 169
 170 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 171 {
 172     CPUState *cs = CPU(dev);
 173     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 174
 175     s390_cpu_gdb_init(cs);
 176     qemu_init_vcpu(cs);
 177 #if !defined(CONFIG_USER_ONLY)
 178     run_on_cpu(cs, s390_do_cpu_full_reset, cs);
 179 #else
 180     cpu_reset(cs);
 181 #endif
 182
 183     scc->parent_realize(dev, errp);
 184 }
 185
 186 static void s390_cpu_initfn(Object *obj)
 187 {
 188     CPUState *cs = CPU(obj);
 189     S390CPU *cpu = S390_CPU(obj);
 190     CPUS390XState *env = &cpu->env;
 191     static bool inited;
 192     static int cpu_num = 0;
 193 #if !defined(CONFIG_USER_ONLY)
 194     struct tm tm;
 195 #endif
 196
 197     cs->env_ptr = env;
 198     cpu_exec_init(env);
 199 #if !defined(CONFIG_USER_ONLY)
 200     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 201     qemu_get_timedate(&tm, 0);
 202     env->tod_offset = TOD_UNIX_EPOCH +
 203                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 204     env->tod_basetime = 0;
 205     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 206     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 207     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 208 #endif
 209     env->cpu_num = cpu_num++;
 210     env->ext_index = -1;
 211
 212     if (tcg_enabled() && !inited) {
 213         inited = true;
 214         s390x_translate_init();
 215     }
 216 }
 217
 218 static void s390_cpu_finalize(Object *obj)
 219 {
 220 #if !defined(CONFIG_USER_ONLY)
 221     S390CPU *cpu = S390_CPU(obj);
 222
 223     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 224     g_free(cpu->irqstate);
 225 #endif
 226 }
 227
 228 #if !defined(CONFIG_USER_ONLY)
 229 static bool disabled_wait(CPUState *cpu)
 230 {
 231     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 232                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 233 }
 234
 235 static unsigned s390_count_running_cpus(void)
 236 {
 237     CPUState *cpu;
 238     int nr_running = 0;
 239
 240     CPU_FOREACH(cpu) {
 241         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 242         if (state == CPU_STATE_OPERATING ||
 243             state == CPU_STATE_LOAD) {
 244             if (!disabled_wait(cpu)) {
 245                 nr_running++;
 246             }
 247         }
 248     }
 249
 250     return nr_running;
 251 }
 252
 253 unsigned int s390_cpu_halt(S390CPU *cpu)
 254 {
 255     CPUState *cs = CPU(cpu);
 256     trace_cpu_halt(cs->cpu_index);
 257
 258     if (!cs->halted) {
 259         cs->halted = 1;
 260         cs->exception_index = EXCP_HLT;
 261     }
 262
 263     return s390_count_running_cpus();
 264 }
 265
 266 void s390_cpu_unhalt(S390CPU *cpu)
 267 {
 268     CPUState *cs = CPU(cpu);
 269     trace_cpu_unhalt(cs->cpu_index);
 270
 271     if (cs->halted) {
 272         cs->halted = 0;
 273         cs->exception_index = -1;
 274     }
 275 }
 276
 277 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 278  {
 279     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 280
 281     switch (cpu_state) {
 282     case CPU_STATE_STOPPED:
 283     case CPU_STATE_CHECK_STOP:
 284         /* halt the cpu for common infrastructure */
 285         s390_cpu_halt(cpu);
 286         break;
 287     case CPU_STATE_OPERATING:
 288     case CPU_STATE_LOAD:
 289         /* unhalt the cpu for common infrastructure */
 290         s390_cpu_unhalt(cpu);
 291         break;
 292     default:
 293         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 294                      cpu_state);
 295         exit(1);
 296     }
 297     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 298         kvm_s390_set_cpu_state(cpu, cpu_state);
 299     }
 300     cpu->env.cpu_state = cpu_state;
 301
 302     return s390_count_running_cpus();
 303 }
 304 #endif
 305
 306 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 307 {
 308     S390CPUClass *scc = S390_CPU_CLASS(oc);
 309     CPUClass *cc = CPU_CLASS(scc);
 310     DeviceClass *dc = DEVICE_CLASS(oc);
 311
 312     scc->parent_realize = dc->realize;
 313     dc->realize = s390_cpu_realizefn;
 314
 315     scc->parent_reset = cc->reset;
 316 #if !defined(CONFIG_USER_ONLY)
 317     scc->load_normal = s390_cpu_load_normal;
 318 #endif
 319     scc->cpu_reset = s390_cpu_reset;
 320     scc->initial_cpu_reset = s390_cpu_initial_reset;
 321     cc->reset = s390_cpu_full_reset;
 322     cc->has_work = s390_cpu_has_work;
 323     cc->do_interrupt = s390_cpu_do_interrupt;
 324     cc->dump_state = s390_cpu_dump_state;
 325     cc->set_pc = s390_cpu_set_pc;
 326     cc->gdb_read_register = s390_cpu_gdb_read_register;
 327     cc->gdb_write_register = s390_cpu_gdb_write_register;
 328 #ifdef CONFIG_USER_ONLY
 329     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 330 #else
 331     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 332     cc->vmsd = &vmstate_s390_cpu;
 333     cc->write_elf64_note = s390_cpu_write_elf64_note;
 334     cc->write_elf64_qemunote = s390_cpu_write_elf64_qemunote;
 335     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 336 #endif
 337     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 338     cc->gdb_core_xml_file = "s390x-core64.xml";
 339 }
 340
 341 static const TypeInfo s390_cpu_type_info = {
 342     .name = TYPE_S390_CPU,
 343     .parent = TYPE_CPU,
 344     .instance_size = sizeof(S390CPU),
 345     .instance_init = s390_cpu_initfn,
 346     .instance_finalize = s390_cpu_finalize,
 347     .abstract = false,
 348     .class_size = sizeof(S390CPUClass),
 349     .class_init = s390_cpu_class_init,
 350 };
 351
 352 static void s390_cpu_register_types(void)
 353 {
 354     type_register_static(&s390_cpu_type_info);
 355 }
 356
 357 type_init(s390_cpu_register_types)