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 #if !defined(CONFIG_USER_ONLY)
  69 /* S390CPUClass::load_normal() */
  70 static void s390_cpu_load_normal(CPUState *s)
  71 {
  72     S390CPU *cpu = S390_CPU(s);
  73     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  74     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  75     s390_add_running_cpu(cpu);
  76 }
  77 #endif
  78
  79 /* S390CPUClass::cpu_reset() */
  80 static void s390_cpu_reset(CPUState *s)
  81 {
  82     S390CPU *cpu = S390_CPU(s);
  83     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  84     CPUS390XState *env = &cpu->env;
  85
  86     env->pfault_token = -1UL;
  87     s390_del_running_cpu(cpu);
  88     scc->parent_reset(s);
  89 #if !defined(CONFIG_USER_ONLY)
  90     s->halted = 1;
  91 #endif
  92     tlb_flush(env, 1);
  93 }
  94
  95 /* S390CPUClass::initial_reset() */
  96 static void s390_cpu_initial_reset(CPUState *s)
  97 {
  98     S390CPU *cpu = S390_CPU(s);
  99     CPUS390XState *env = &cpu->env;
 100
 101     s390_cpu_reset(s);
 102     /* initial reset does not touch regs,fregs and aregs */
 103     memset(&env->fpc, 0, offsetof(CPUS390XState, breakpoints) -
 104                          offsetof(CPUS390XState, fpc));
 105
 106     /* architectured initial values for CR 0 and 14 */
 107     env->cregs[0] = CR0_RESET;
 108     env->cregs[14] = CR14_RESET;
 109
 110     env->pfault_token = -1UL;
 111
 112 #if defined(CONFIG_KVM)
 113     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 114     if (kvm_enabled()) {
 115         if (kvm_vcpu_ioctl(s, KVM_S390_INITIAL_RESET, NULL)) {
 116             perror("Initial CPU reset failed");
 117         }
 118     }
 119 #endif
 120 }
 121
 122 /* CPUClass:reset() */
 123 static void s390_cpu_full_reset(CPUState *s)
 124 {
 125     S390CPU *cpu = S390_CPU(s);
 126     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 127     CPUS390XState *env = &cpu->env;
 128
 129     s390_del_running_cpu(cpu);
 130
 131     scc->parent_reset(s);
 132
 133     memset(env, 0, offsetof(CPUS390XState, breakpoints));
 134
 135     /* architectured initial values for CR 0 and 14 */
 136     env->cregs[0] = CR0_RESET;
 137     env->cregs[14] = CR14_RESET;
 138
 139     env->pfault_token = -1UL;
 140
 141     /* set halted to 1 to make sure we can add the cpu in
 142      * s390_ipl_cpu code, where CPUState::halted is set back to 0
 143      * after incrementing the cpu counter */
 144 #if !defined(CONFIG_USER_ONLY)
 145     s->halted = 1;
 146 #endif
 147     tlb_flush(env, 1);
 148 }
 149
 150 #if !defined(CONFIG_USER_ONLY)
 151 static void s390_cpu_machine_reset_cb(void *opaque)
 152 {
 153     S390CPU *cpu = opaque;
 154
 155     cpu_reset(CPU(cpu));
 156 }
 157 #endif
 158
 159 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 160 {
 161     CPUState *cs = CPU(dev);
 162     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 163
 164     qemu_init_vcpu(cs);
 165     cpu_reset(cs);
 166
 167     scc->parent_realize(dev, errp);
 168 }
 169
 170 static void s390_cpu_initfn(Object *obj)
 171 {
 172     CPUState *cs = CPU(obj);
 173     S390CPU *cpu = S390_CPU(obj);
 174     CPUS390XState *env = &cpu->env;
 175     static bool inited;
 176     static int cpu_num = 0;
 177 #if !defined(CONFIG_USER_ONLY)
 178     struct tm tm;
 179 #endif
 180
 181     cs->env_ptr = env;
 182     cpu_exec_init(env);
 183 #if !defined(CONFIG_USER_ONLY)
 184     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 185     qemu_get_timedate(&tm, 0);
 186     env->tod_offset = TOD_UNIX_EPOCH +
 187                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 188     env->tod_basetime = 0;
 189     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 190     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 191     /* set CPUState::halted state to 1 to avoid decrementing the running
 192      * cpu counter in s390_cpu_reset to a negative number at
 193      * initial ipl */
 194     cs->halted = 1;
 195 #endif
 196     env->cpu_num = cpu_num++;
 197     env->ext_index = -1;
 198
 199     if (tcg_enabled() && !inited) {
 200         inited = true;
 201         s390x_translate_init();
 202     }
 203 }
 204
 205 static void s390_cpu_finalize(Object *obj)
 206 {
 207 #if !defined(CONFIG_USER_ONLY)
 208     S390CPU *cpu = S390_CPU(obj);
 209
 210     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 211 #endif
 212 }
 213
 214 static const VMStateDescription vmstate_s390_cpu = {
 215     .name = "cpu",
 216     .unmigratable = 1,
 217 };
 218
 219 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 220 {
 221     S390CPUClass *scc = S390_CPU_CLASS(oc);
 222     CPUClass *cc = CPU_CLASS(scc);
 223     DeviceClass *dc = DEVICE_CLASS(oc);
 224
 225     scc->parent_realize = dc->realize;
 226     dc->realize = s390_cpu_realizefn;
 227
 228     scc->parent_reset = cc->reset;
 229 #if !defined(CONFIG_USER_ONLY)
 230     scc->load_normal = s390_cpu_load_normal;
 231 #endif
 232     scc->cpu_reset = s390_cpu_reset;
 233     scc->initial_cpu_reset = s390_cpu_initial_reset;
 234     cc->reset = s390_cpu_full_reset;
 235     cc->do_interrupt = s390_cpu_do_interrupt;
 236     cc->dump_state = s390_cpu_dump_state;
 237     cc->set_pc = s390_cpu_set_pc;
 238     cc->gdb_read_register = s390_cpu_gdb_read_register;
 239     cc->gdb_write_register = s390_cpu_gdb_write_register;
 240 #ifndef CONFIG_USER_ONLY
 241     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 242     cc->write_elf64_note = s390_cpu_write_elf64_note;
 243     cc->write_elf64_qemunote = s390_cpu_write_elf64_qemunote;
 244 #endif
 245     dc->vmsd = &vmstate_s390_cpu;
 246     cc->gdb_num_core_regs = S390_NUM_REGS;
 247 }
 248
 249 static const TypeInfo s390_cpu_type_info = {
 250     .name = TYPE_S390_CPU,
 251     .parent = TYPE_CPU,
 252     .instance_size = sizeof(S390CPU),
 253     .instance_init = s390_cpu_initfn,
 254     .instance_finalize = s390_cpu_finalize,
 255     .abstract = false,
 256     .class_size = sizeof(S390CPUClass),
 257     .class_init = s390_cpu_class_init,
 258 };
 259
 260 static void s390_cpu_register_types(void)
 261 {
 262     type_register_static(&s390_cpu_type_info);
 263 }
 264
 265 type_init(s390_cpu_register_types)