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 "hw/hw.h"
  30 #ifndef CONFIG_USER_ONLY
  31 #include "sysemu/arch_init.h"
  32 #endif
  33
  34 #define CR0_RESET       0xE0UL
  35 #define CR14_RESET      0xC2000000UL;
  36
  37 /* generate CPU information for cpu -? */
  38 void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
  39 {
  40 #ifdef CONFIG_KVM
  41     (*cpu_fprintf)(f, "s390 %16s\n", "host");
  42 #endif
  43 }
  44
  45 #ifndef CONFIG_USER_ONLY
  46 CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
  47 {
  48     CpuDefinitionInfoList *entry;
  49     CpuDefinitionInfo *info;
  50
  51     info = g_malloc0(sizeof(*info));
  52     info->name = g_strdup("host");
  53
  54     entry = g_malloc0(sizeof(*entry));
  55     entry->value = info;
  56
  57     return entry;
  58 }
  59 #endif
  60
  61 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  62 {
  63     S390CPU *cpu = S390_CPU(cs);
  64
  65     cpu->env.psw.addr = value;
  66 }
  67
  68 static bool s390_cpu_has_work(CPUState *cs)
  69 {
  70     S390CPU *cpu = S390_CPU(cs);
  71     CPUS390XState *env = &cpu->env;
  72
  73     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  74            (env->psw.mask & PSW_MASK_EXT);
  75 }
  76
  77 #if !defined(CONFIG_USER_ONLY)
  78 /* S390CPUClass::load_normal() */
  79 static void s390_cpu_load_normal(CPUState *s)
  80 {
  81     S390CPU *cpu = S390_CPU(s);
  82     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  83     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  84     s390_add_running_cpu(cpu);
  85 }
  86 #endif
  87
  88 /* S390CPUClass::cpu_reset() */
  89 static void s390_cpu_reset(CPUState *s)
  90 {
  91     S390CPU *cpu = S390_CPU(s);
  92     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  93     CPUS390XState *env = &cpu->env;
  94
  95     env->pfault_token = -1UL;
  96     s390_del_running_cpu(cpu);
  97     scc->parent_reset(s);
  98 #if !defined(CONFIG_USER_ONLY)
  99     s->halted = 1;
 100 #endif
 101     tlb_flush(env, 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 #if defined(CONFIG_KVM)
 122     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 123     if (kvm_enabled()) {
 124         if (kvm_vcpu_ioctl(s, KVM_S390_INITIAL_RESET, NULL)) {
 125             perror("Initial CPU reset failed");
 126         }
 127     }
 128 #endif
 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     s390_del_running_cpu(cpu);
 139
 140     scc->parent_reset(s);
 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     /* set halted to 1 to make sure we can add the cpu in
 151      * s390_ipl_cpu code, where CPUState::halted is set back to 0
 152      * after incrementing the cpu counter */
 153 #if !defined(CONFIG_USER_ONLY)
 154     s->halted = 1;
 155 #endif
 156     tlb_flush(env, 1);
 157 }
 158
 159 #if !defined(CONFIG_USER_ONLY)
 160 static void s390_cpu_machine_reset_cb(void *opaque)
 161 {
 162     S390CPU *cpu = opaque;
 163
 164     cpu_reset(CPU(cpu));
 165 }
 166 #endif
 167
 168 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 169 {
 170     CPUState *cs = CPU(dev);
 171     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 172
 173     qemu_init_vcpu(cs);
 174     cpu_reset(cs);
 175
 176     scc->parent_realize(dev, errp);
 177 }
 178
 179 static void s390_cpu_initfn(Object *obj)
 180 {
 181     CPUState *cs = CPU(obj);
 182     S390CPU *cpu = S390_CPU(obj);
 183     CPUS390XState *env = &cpu->env;
 184     static bool inited;
 185     static int cpu_num = 0;
 186 #if !defined(CONFIG_USER_ONLY)
 187     struct tm tm;
 188 #endif
 189
 190     cs->env_ptr = env;
 191     cpu_exec_init(env);
 192 #if !defined(CONFIG_USER_ONLY)
 193     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 194     qemu_get_timedate(&tm, 0);
 195     env->tod_offset = TOD_UNIX_EPOCH +
 196                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 197     env->tod_basetime = 0;
 198     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 199     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 200     /* set CPUState::halted state to 1 to avoid decrementing the running
 201      * cpu counter in s390_cpu_reset to a negative number at
 202      * initial ipl */
 203     cs->halted = 1;
 204 #endif
 205     env->cpu_num = cpu_num++;
 206     env->ext_index = -1;
 207
 208     if (tcg_enabled() && !inited) {
 209         inited = true;
 210         s390x_translate_init();
 211     }
 212 }
 213
 214 static void s390_cpu_finalize(Object *obj)
 215 {
 216 #if !defined(CONFIG_USER_ONLY)
 217     S390CPU *cpu = S390_CPU(obj);
 218
 219     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 220 #endif
 221 }
 222
 223 static const VMStateDescription vmstate_s390_cpu = {
 224     .name = "cpu",
 225     .unmigratable = 1,
 226 };
 227
 228 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 229 {
 230     S390CPUClass *scc = S390_CPU_CLASS(oc);
 231     CPUClass *cc = CPU_CLASS(scc);
 232     DeviceClass *dc = DEVICE_CLASS(oc);
 233
 234     scc->parent_realize = dc->realize;
 235     dc->realize = s390_cpu_realizefn;
 236
 237     scc->parent_reset = cc->reset;
 238 #if !defined(CONFIG_USER_ONLY)
 239     scc->load_normal = s390_cpu_load_normal;
 240 #endif
 241     scc->cpu_reset = s390_cpu_reset;
 242     scc->initial_cpu_reset = s390_cpu_initial_reset;
 243     cc->reset = s390_cpu_full_reset;
 244     cc->has_work = s390_cpu_has_work;
 245     cc->do_interrupt = s390_cpu_do_interrupt;
 246     cc->dump_state = s390_cpu_dump_state;
 247     cc->set_pc = s390_cpu_set_pc;
 248     cc->gdb_read_register = s390_cpu_gdb_read_register;
 249     cc->gdb_write_register = s390_cpu_gdb_write_register;
 250 #ifdef CONFIG_USER_ONLY
 251     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 252 #else
 253     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 254     cc->write_elf64_note = s390_cpu_write_elf64_note;
 255     cc->write_elf64_qemunote = s390_cpu_write_elf64_qemunote;
 256 #endif
 257     dc->vmsd = &vmstate_s390_cpu;
 258     cc->gdb_num_core_regs = S390_NUM_REGS;
 259 }
 260
 261 static const TypeInfo s390_cpu_type_info = {
 262     .name = TYPE_S390_CPU,
 263     .parent = TYPE_CPU,
 264     .instance_size = sizeof(S390CPU),
 265     .instance_init = s390_cpu_initfn,
 266     .instance_finalize = s390_cpu_finalize,
 267     .abstract = false,
 268     .class_size = sizeof(S390CPUClass),
 269     .class_init = s390_cpu_class_init,
 270 };
 271
 272 static void s390_cpu_register_types(void)
 273 {
 274     type_register_static(&s390_cpu_type_info);
 275 }
 276
 277 type_init(s390_cpu_register_types)