target-m68k/cpu.c

   1 /*
   2  * QEMU Motorola 68k CPU
   3  *
   4  * Copyright (c) 2012 SUSE LINUX Products GmbH
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see
  18  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  19  */
  20
  21 #include "cpu.h"
  22 #include "qemu-common.h"
  23 #include "migration/vmstate.h"
  24
  25
  26 static void m68k_set_feature(CPUM68KState *env, int feature)
  27 {
  28     env->features |= (1u << feature);
  29 }
  30
  31 /* CPUClass::reset() */
  32 static void m68k_cpu_reset(CPUState *s)
  33 {
  34     M68kCPU *cpu = M68K_CPU(s);
  35     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(cpu);
  36     CPUM68KState *env = &cpu->env;
  37
  38     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
  39         qemu_log("CPU Reset (CPU %d)\n", s->cpu_index);
  40         log_cpu_state(env, 0);
  41     }
  42
  43     mcc->parent_reset(s);
  44
  45     memset(env, 0, offsetof(CPUM68KState, breakpoints));
  46 #if !defined(CONFIG_USER_ONLY)
  47     env->sr = 0x2700;
  48 #endif
  49     m68k_switch_sp(env);
  50     /* ??? FP regs should be initialized to NaN.  */
  51     env->cc_op = CC_OP_FLAGS;
  52     /* TODO: We should set PC from the interrupt vector.  */
  53     env->pc = 0;
  54     tlb_flush(env, 1);
  55 }
  56
  57 /* CPU models */
  58
  59 static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  60 {
  61     ObjectClass *oc;
  62     char *typename;
  63
  64     if (cpu_model == NULL) {
  65         return NULL;
  66     }
  67
  68     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  69     oc = object_class_by_name(typename);
  70     g_free(typename);
  71     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  72                        object_class_is_abstract(oc))) {
  73         return NULL;
  74     }
  75     return oc;
  76 }
  77
  78 static void m5206_cpu_initfn(Object *obj)
  79 {
  80     M68kCPU *cpu = M68K_CPU(obj);
  81     CPUM68KState *env = &cpu->env;
  82
  83     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  84 }
  85
  86 static void m5208_cpu_initfn(Object *obj)
  87 {
  88     M68kCPU *cpu = M68K_CPU(obj);
  89     CPUM68KState *env = &cpu->env;
  90
  91     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  92     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
  93     m68k_set_feature(env, M68K_FEATURE_BRAL);
  94     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
  95     m68k_set_feature(env, M68K_FEATURE_USP);
  96 }
  97
  98 static void cfv4e_cpu_initfn(Object *obj)
  99 {
 100     M68kCPU *cpu = M68K_CPU(obj);
 101     CPUM68KState *env = &cpu->env;
 102
 103     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 104     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 105     m68k_set_feature(env, M68K_FEATURE_BRAL);
 106     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 107     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 108     m68k_set_feature(env, M68K_FEATURE_USP);
 109 }
 110
 111 static void any_cpu_initfn(Object *obj)
 112 {
 113     M68kCPU *cpu = M68K_CPU(obj);
 114     CPUM68KState *env = &cpu->env;
 115
 116     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 117     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 118     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 119     m68k_set_feature(env, M68K_FEATURE_BRAL);
 120     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 121     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 122        It's mostly backwards compatible.  */
 123     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 124     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 125     m68k_set_feature(env, M68K_FEATURE_USP);
 126     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 127     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 128 }
 129
 130 typedef struct M68kCPUInfo {
 131     const char *name;
 132     void (*instance_init)(Object *obj);
 133 } M68kCPUInfo;
 134
 135 static const M68kCPUInfo m68k_cpus[] = {
 136     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 137     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 138     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 139     { .name = "any",   .instance_init = any_cpu_initfn },
 140 };
 141
 142 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 143 {
 144     M68kCPU *cpu = M68K_CPU(dev);
 145     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 146
 147     m68k_cpu_init_gdb(cpu);
 148
 149     cpu_reset(CPU(cpu));
 150     qemu_init_vcpu(&cpu->env);
 151
 152     mcc->parent_realize(dev, errp);
 153 }
 154
 155 static void m68k_cpu_initfn(Object *obj)
 156 {
 157     CPUState *cs = CPU(obj);
 158     M68kCPU *cpu = M68K_CPU(obj);
 159     CPUM68KState *env = &cpu->env;
 160     static bool inited;
 161
 162     cs->env_ptr = env;
 163     cpu_exec_init(env);
 164
 165     if (tcg_enabled() && !inited) {
 166         inited = true;
 167         m68k_tcg_init();
 168     }
 169 }
 170
 171 static const VMStateDescription vmstate_m68k_cpu = {
 172     .name = "cpu",
 173     .unmigratable = 1,
 174 };
 175
 176 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 177 {
 178     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 179     CPUClass *cc = CPU_CLASS(c);
 180     DeviceClass *dc = DEVICE_CLASS(c);
 181
 182     mcc->parent_realize = dc->realize;
 183     dc->realize = m68k_cpu_realizefn;
 184
 185     mcc->parent_reset = cc->reset;
 186     cc->reset = m68k_cpu_reset;
 187
 188     cc->class_by_name = m68k_cpu_class_by_name;
 189     dc->vmsd = &vmstate_m68k_cpu;
 190 }
 191
 192 static void register_cpu_type(const M68kCPUInfo *info)
 193 {
 194     TypeInfo type_info = {
 195         .parent = TYPE_M68K_CPU,
 196         .instance_init = info->instance_init,
 197     };
 198
 199     type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 200     type_register(&type_info);
 201     g_free((void *)type_info.name);
 202 }
 203
 204 static const TypeInfo m68k_cpu_type_info = {
 205     .name = TYPE_M68K_CPU,
 206     .parent = TYPE_CPU,
 207     .instance_size = sizeof(M68kCPU),
 208     .instance_init = m68k_cpu_initfn,
 209     .abstract = true,
 210     .class_size = sizeof(M68kCPUClass),
 211     .class_init = m68k_cpu_class_init,
 212 };
 213
 214 static void m68k_cpu_register_types(void)
 215 {
 216     int i;
 217
 218     type_register_static(&m68k_cpu_type_info);
 219     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 220         register_cpu_type(&m68k_cpus[i]);
 221     }
 222 }
 223
 224 type_init(m68k_cpu_register_types)