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     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 100     tlb_flush(s, 1);
 101 }
 102
 103 /* S390CPUClass::initial_reset() */
 104 static void s390_cpu_initial_reset(CPUState *s)
 105 {
 106     S390CPU *cpu = S390_CPU(s);
 107     CPUS390XState *env = &cpu->env;
 108
 109     s390_cpu_reset(s);
 110     /* initial reset does not touch regs,fregs and aregs */
 111     memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
 112                          offsetof(CPUS390XState, fpc));
 113
 114     /* architectured initial values for CR 0 and 14 */
 115     env->cregs[0] = CR0_RESET;
 116     env->cregs[14] = CR14_RESET;
 117
 118     env->pfault_token = -1UL;
 119
 120     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 121     if (kvm_enabled()) {
 122         kvm_s390_reset_vcpu(cpu);
 123     }
 124 }
 125
 126 /* CPUClass:reset() */
 127 static void s390_cpu_full_reset(CPUState *s)
 128 {
 129     S390CPU *cpu = S390_CPU(s);
 130     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 131     CPUS390XState *env = &cpu->env;
 132
 133     scc->parent_reset(s);
 134     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 135
 136     memset(env, 0, offsetof(CPUS390XState, cpu_num));
 137
 138     /* architectured initial values for CR 0 and 14 */
 139     env->cregs[0] = CR0_RESET;
 140     env->cregs[14] = CR14_RESET;
 141
 142     env->pfault_token = -1UL;
 143
 144     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 145     if (kvm_enabled()) {
 146         kvm_s390_reset_vcpu(cpu);
 147     }
 148     tlb_flush(s, 1);
 149 }
 150
 151 #if !defined(CONFIG_USER_ONLY)
 152 static void s390_cpu_machine_reset_cb(void *opaque)
 153 {
 154     S390CPU *cpu = opaque;
 155
 156     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, CPU(cpu));
 157 }
 158 #endif
 159
 160 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 161 {
 162     CPUState *cs = CPU(dev);
 163     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 164
 165     s390_cpu_gdb_init(cs);
 166     qemu_init_vcpu(cs);
 167 #if !defined(CONFIG_USER_ONLY)
 168     run_on_cpu(cs, s390_do_cpu_full_reset, cs);
 169 #else
 170     cpu_reset(cs);
 171 #endif
 172
 173     scc->parent_realize(dev, errp);
 174 }
 175
 176 static void s390_cpu_initfn(Object *obj)
 177 {
 178     CPUState *cs = CPU(obj);
 179     S390CPU *cpu = S390_CPU(obj);
 180     CPUS390XState *env = &cpu->env;
 181     static bool inited;
 182     static int cpu_num = 0;
 183 #if !defined(CONFIG_USER_ONLY)
 184     struct tm tm;
 185 #endif
 186
 187     cs->env_ptr = env;
 188     cpu_exec_init(env);
 189 #if !defined(CONFIG_USER_ONLY)
 190     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 191     qemu_get_timedate(&tm, 0);
 192     env->tod_offset = TOD_UNIX_EPOCH +
 193                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 194     env->tod_basetime = 0;
 195     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 196     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 197     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 198 #endif
 199     env->cpu_num = cpu_num++;
 200     env->ext_index = -1;
 201
 202     if (tcg_enabled() && !inited) {
 203         inited = true;
 204         s390x_translate_init();
 205     }
 206 }
 207
 208 static void s390_cpu_finalize(Object *obj)
 209 {
 210 #if !defined(CONFIG_USER_ONLY)
 211     S390CPU *cpu = S390_CPU(obj);
 212
 213     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 214 #endif
 215 }
 216
 217 #if !defined(CONFIG_USER_ONLY)
 218 static bool disabled_wait(CPUState *cpu)
 219 {
 220     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 221                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 222 }
 223
 224 static unsigned s390_count_running_cpus(void)
 225 {
 226     CPUState *cpu;
 227     int nr_running = 0;
 228
 229     CPU_FOREACH(cpu) {
 230         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 231         if (state == CPU_STATE_OPERATING ||
 232             state == CPU_STATE_LOAD) {
 233             if (!disabled_wait(cpu)) {
 234                 nr_running++;
 235             }
 236         }
 237     }
 238
 239     return nr_running;
 240 }
 241
 242 unsigned int s390_cpu_halt(S390CPU *cpu)
 243 {
 244     CPUState *cs = CPU(cpu);
 245     trace_cpu_halt(cs->cpu_index);
 246
 247     if (!cs->halted) {
 248         cs->halted = 1;
 249         cs->exception_index = EXCP_HLT;
 250     }
 251
 252     return s390_count_running_cpus();
 253 }
 254
 255 void s390_cpu_unhalt(S390CPU *cpu)
 256 {
 257     CPUState *cs = CPU(cpu);
 258     trace_cpu_unhalt(cs->cpu_index);
 259
 260     if (cs->halted) {
 261         cs->halted = 0;
 262         cs->exception_index = -1;
 263     }
 264 }
 265
 266 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 267  {
 268     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 269
 270     switch (cpu_state) {
 271     case CPU_STATE_STOPPED:
 272     case CPU_STATE_CHECK_STOP:
 273         /* halt the cpu for common infrastructure */
 274         s390_cpu_halt(cpu);
 275         break;
 276     case CPU_STATE_OPERATING:
 277     case CPU_STATE_LOAD:
 278         /* unhalt the cpu for common infrastructure */
 279         s390_cpu_unhalt(cpu);
 280         break;
 281     default:
 282         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 283                      cpu_state);
 284         exit(1);
 285     }
 286     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 287         kvm_s390_set_cpu_state(cpu, cpu_state);
 288     }
 289     cpu->env.cpu_state = cpu_state;
 290
 291     return s390_count_running_cpus();
 292 }
 293 #endif
 294
 295 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 296 {
 297     S390CPUClass *scc = S390_CPU_CLASS(oc);
 298     CPUClass *cc = CPU_CLASS(scc);
 299     DeviceClass *dc = DEVICE_CLASS(oc);
 300
 301     scc->parent_realize = dc->realize;
 302     dc->realize = s390_cpu_realizefn;
 303
 304     scc->parent_reset = cc->reset;
 305 #if !defined(CONFIG_USER_ONLY)
 306     scc->load_normal = s390_cpu_load_normal;
 307 #endif
 308     scc->cpu_reset = s390_cpu_reset;
 309     scc->initial_cpu_reset = s390_cpu_initial_reset;
 310     cc->reset = s390_cpu_full_reset;
 311     cc->has_work = s390_cpu_has_work;
 312     cc->do_interrupt = s390_cpu_do_interrupt;
 313     cc->dump_state = s390_cpu_dump_state;
 314     cc->set_pc = s390_cpu_set_pc;
 315     cc->gdb_read_register = s390_cpu_gdb_read_register;
 316     cc->gdb_write_register = s390_cpu_gdb_write_register;
 317 #ifdef CONFIG_USER_ONLY
 318     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 319 #else
 320     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 321     cc->vmsd = &vmstate_s390_cpu;
 322     cc->write_elf64_note = s390_cpu_write_elf64_note;
 323     cc->write_elf64_qemunote = s390_cpu_write_elf64_qemunote;
 324     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 325 #endif
 326     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 327     cc->gdb_core_xml_file = "s390x-core64.xml";
 328 }
 329
 330 static const TypeInfo s390_cpu_type_info = {
 331     .name = TYPE_S390_CPU,
 332     .parent = TYPE_CPU,
 333     .instance_size = sizeof(S390CPU),
 334     .instance_init = s390_cpu_initfn,
 335     .instance_finalize = s390_cpu_finalize,
 336     .abstract = false,
 337     .class_size = sizeof(S390CPUClass),
 338     .class_init = s390_cpu_class_init,
 339 };
 340
 341 static void s390_cpu_register_types(void)
 342 {
 343     type_register_static(&s390_cpu_type_info);
 344 }
 345
 346 type_init(s390_cpu_register_types)