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 #ifndef CONFIG_USER_ONLY
  30 #include "hw/hw.h"
  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 /* CPUClass::reset() */
  62 static void s390_cpu_reset(CPUState *s)
  63 {
  64     S390CPU *cpu = S390_CPU(s);
  65     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  66     CPUS390XState *env = &cpu->env;
  67
  68     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
  69         qemu_log("CPU Reset (CPU %d)\n", s->cpu_index);
  70         log_cpu_state(env, 0);
  71     }
  72
  73     s390_del_running_cpu(env);
  74
  75     scc->parent_reset(s);
  76
  77     memset(env, 0, offsetof(CPUS390XState, breakpoints));
  78
  79     /* architectured initial values for CR 0 and 14 */
  80     env->cregs[0] = CR0_RESET;
  81     env->cregs[14] = CR14_RESET;
  82     /* set halted to 1 to make sure we can add the cpu in
  83      * s390_ipl_cpu code, where env->halted is set back to 0
  84      * after incrementing the cpu counter */
  85 #if !defined(CONFIG_USER_ONLY)
  86     env->halted = 1;
  87 #endif
  88     tlb_flush(env, 1);
  89 }
  90
  91 #if !defined(CONFIG_USER_ONLY)
  92 static void s390_cpu_machine_reset_cb(void *opaque)
  93 {
  94     S390CPU *cpu = opaque;
  95
  96     cpu_reset(CPU(cpu));
  97 }
  98 #endif
  99
 100 static void s390_cpu_initfn(Object *obj)
 101 {
 102     S390CPU *cpu = S390_CPU(obj);
 103     CPUS390XState *env = &cpu->env;
 104     static int cpu_num = 0;
 105 #if !defined(CONFIG_USER_ONLY)
 106     struct tm tm;
 107 #endif
 108
 109     cpu_exec_init(env);
 110 #if !defined(CONFIG_USER_ONLY)
 111     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 112     qemu_get_timedate(&tm, 0);
 113     env->tod_offset = TOD_UNIX_EPOCH +
 114                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 115     env->tod_basetime = 0;
 116     env->tod_timer = qemu_new_timer_ns(vm_clock, s390x_tod_timer, cpu);
 117     env->cpu_timer = qemu_new_timer_ns(vm_clock, s390x_cpu_timer, cpu);
 118     /* set env->halted state to 1 to avoid decrementing the running
 119      * cpu counter in s390_cpu_reset to a negative number at
 120      * initial ipl */
 121     env->halted = 1;
 122 #endif
 123     env->cpu_num = cpu_num++;
 124     env->ext_index = -1;
 125
 126     cpu_reset(CPU(cpu));
 127 }
 128
 129 static void s390_cpu_finalize(Object *obj)
 130 {
 131 #if !defined(CONFIG_USER_ONLY)
 132     S390CPU *cpu = S390_CPU(obj);
 133
 134     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 135 #endif
 136 }
 137
 138 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 139 {
 140     S390CPUClass *scc = S390_CPU_CLASS(oc);
 141     CPUClass *cc = CPU_CLASS(scc);
 142
 143     scc->parent_reset = cc->reset;
 144     cc->reset = s390_cpu_reset;
 145 }
 146
 147 static const TypeInfo s390_cpu_type_info = {
 148     .name = TYPE_S390_CPU,
 149     .parent = TYPE_CPU,
 150     .instance_size = sizeof(S390CPU),
 151     .instance_init = s390_cpu_initfn,
 152     .instance_finalize = s390_cpu_finalize,
 153     .abstract = false,
 154     .class_size = sizeof(S390CPUClass),
 155     .class_init = s390_cpu_class_init,
 156 };
 157
 158 static void s390_cpu_register_types(void)
 159 {
 160     type_register_static(&s390_cpu_type_info);
 161 }
 162
 163 type_init(s390_cpu_register_types)