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     mcc->parent_reset(s);
  39
  40     memset(env, 0, offsetof(CPUM68KState, breakpoints));
  41 #if !defined(CONFIG_USER_ONLY)
  42     env->sr = 0x2700;
  43 #endif
  44     m68k_switch_sp(env);
  45     /* ??? FP regs should be initialized to NaN.  */
  46     env->cc_op = CC_OP_FLAGS;
  47     /* TODO: We should set PC from the interrupt vector.  */
  48     env->pc = 0;
  49     tlb_flush(env, 1);
  50 }
  51
  52 /* CPU models */
  53
  54 static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  55 {
  56     ObjectClass *oc;
  57     char *typename;
  58
  59     if (cpu_model == NULL) {
  60         return NULL;
  61     }
  62
  63     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  64     oc = object_class_by_name(typename);
  65     g_free(typename);
  66     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  67                        object_class_is_abstract(oc))) {
  68         return NULL;
  69     }
  70     return oc;
  71 }
  72
  73 static void m5206_cpu_initfn(Object *obj)
  74 {
  75     M68kCPU *cpu = M68K_CPU(obj);
  76     CPUM68KState *env = &cpu->env;
  77
  78     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  79 }
  80
  81 static void m5208_cpu_initfn(Object *obj)
  82 {
  83     M68kCPU *cpu = M68K_CPU(obj);
  84     CPUM68KState *env = &cpu->env;
  85
  86     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  87     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
  88     m68k_set_feature(env, M68K_FEATURE_BRAL);
  89     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
  90     m68k_set_feature(env, M68K_FEATURE_USP);
  91 }
  92
  93 static void cfv4e_cpu_initfn(Object *obj)
  94 {
  95     M68kCPU *cpu = M68K_CPU(obj);
  96     CPUM68KState *env = &cpu->env;
  97
  98     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  99     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 100     m68k_set_feature(env, M68K_FEATURE_BRAL);
 101     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 102     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 103     m68k_set_feature(env, M68K_FEATURE_USP);
 104 }
 105
 106 static void any_cpu_initfn(Object *obj)
 107 {
 108     M68kCPU *cpu = M68K_CPU(obj);
 109     CPUM68KState *env = &cpu->env;
 110
 111     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 112     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 113     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 114     m68k_set_feature(env, M68K_FEATURE_BRAL);
 115     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 116     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 117        It's mostly backwards compatible.  */
 118     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 119     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 120     m68k_set_feature(env, M68K_FEATURE_USP);
 121     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 122     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 123 }
 124
 125 typedef struct M68kCPUInfo {
 126     const char *name;
 127     void (*instance_init)(Object *obj);
 128 } M68kCPUInfo;
 129
 130 static const M68kCPUInfo m68k_cpus[] = {
 131     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 132     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 133     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 134     { .name = "any",   .instance_init = any_cpu_initfn },
 135 };
 136
 137 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 138 {
 139     M68kCPU *cpu = M68K_CPU(dev);
 140     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 141
 142     m68k_cpu_init_gdb(cpu);
 143
 144     cpu_reset(CPU(cpu));
 145
 146     mcc->parent_realize(dev, errp);
 147 }
 148
 149 static void m68k_cpu_initfn(Object *obj)
 150 {
 151     CPUState *cs = CPU(obj);
 152     M68kCPU *cpu = M68K_CPU(obj);
 153     CPUM68KState *env = &cpu->env;
 154     static bool inited;
 155
 156     cs->env_ptr = env;
 157     cpu_exec_init(env);
 158
 159     if (tcg_enabled() && !inited) {
 160         inited = true;
 161         m68k_tcg_init();
 162     }
 163 }
 164
 165 static const VMStateDescription vmstate_m68k_cpu = {
 166     .name = "cpu",
 167     .unmigratable = 1,
 168 };
 169
 170 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 171 {
 172     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 173     CPUClass *cc = CPU_CLASS(c);
 174     DeviceClass *dc = DEVICE_CLASS(c);
 175
 176     mcc->parent_realize = dc->realize;
 177     dc->realize = m68k_cpu_realizefn;
 178
 179     mcc->parent_reset = cc->reset;
 180     cc->reset = m68k_cpu_reset;
 181
 182     cc->class_by_name = m68k_cpu_class_by_name;
 183     cc->do_interrupt = m68k_cpu_do_interrupt;
 184     cc->dump_state = m68k_cpu_dump_state;
 185     dc->vmsd = &vmstate_m68k_cpu;
 186 }
 187
 188 static void register_cpu_type(const M68kCPUInfo *info)
 189 {
 190     TypeInfo type_info = {
 191         .parent = TYPE_M68K_CPU,
 192         .instance_init = info->instance_init,
 193     };
 194
 195     type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 196     type_register(&type_info);
 197     g_free((void *)type_info.name);
 198 }
 199
 200 static const TypeInfo m68k_cpu_type_info = {
 201     .name = TYPE_M68K_CPU,
 202     .parent = TYPE_CPU,
 203     .instance_size = sizeof(M68kCPU),
 204     .instance_init = m68k_cpu_initfn,
 205     .abstract = true,
 206     .class_size = sizeof(M68kCPUClass),
 207     .class_init = m68k_cpu_class_init,
 208 };
 209
 210 static void m68k_cpu_register_types(void)
 211 {
 212     int i;
 213
 214     type_register_static(&m68k_cpu_type_info);
 215     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 216         register_cpu_type(&m68k_cpus[i]);
 217     }
 218 }
 219
 220 type_init(m68k_cpu_register_types)