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_cpu_set_pc(CPUState *cs, vaddr value)
  27 {
  28     M68kCPU *cpu = M68K_CPU(cs);
  29
  30     cpu->env.pc = value;
  31 }
  32
  33 static void m68k_set_feature(CPUM68KState *env, int feature)
  34 {
  35     env->features |= (1u << feature);
  36 }
  37
  38 /* CPUClass::reset() */
  39 static void m68k_cpu_reset(CPUState *s)
  40 {
  41     M68kCPU *cpu = M68K_CPU(s);
  42     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(cpu);
  43     CPUM68KState *env = &cpu->env;
  44
  45     mcc->parent_reset(s);
  46
  47     memset(env, 0, offsetof(CPUM68KState, breakpoints));
  48 #if !defined(CONFIG_USER_ONLY)
  49     env->sr = 0x2700;
  50 #endif
  51     m68k_switch_sp(env);
  52     /* ??? FP regs should be initialized to NaN.  */
  53     env->cc_op = CC_OP_FLAGS;
  54     /* TODO: We should set PC from the interrupt vector.  */
  55     env->pc = 0;
  56     tlb_flush(env, 1);
  57 }
  58
  59 /* CPU models */
  60
  61 static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  62 {
  63     ObjectClass *oc;
  64     char *typename;
  65
  66     if (cpu_model == NULL) {
  67         return NULL;
  68     }
  69
  70     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  71     oc = object_class_by_name(typename);
  72     g_free(typename);
  73     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  74                        object_class_is_abstract(oc))) {
  75         return NULL;
  76     }
  77     return oc;
  78 }
  79
  80 static void m5206_cpu_initfn(Object *obj)
  81 {
  82     M68kCPU *cpu = M68K_CPU(obj);
  83     CPUM68KState *env = &cpu->env;
  84
  85     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  86 }
  87
  88 static void m5208_cpu_initfn(Object *obj)
  89 {
  90     M68kCPU *cpu = M68K_CPU(obj);
  91     CPUM68KState *env = &cpu->env;
  92
  93     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  94     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
  95     m68k_set_feature(env, M68K_FEATURE_BRAL);
  96     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
  97     m68k_set_feature(env, M68K_FEATURE_USP);
  98 }
  99
 100 static void cfv4e_cpu_initfn(Object *obj)
 101 {
 102     M68kCPU *cpu = M68K_CPU(obj);
 103     CPUM68KState *env = &cpu->env;
 104
 105     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 106     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 107     m68k_set_feature(env, M68K_FEATURE_BRAL);
 108     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 109     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 110     m68k_set_feature(env, M68K_FEATURE_USP);
 111 }
 112
 113 static void any_cpu_initfn(Object *obj)
 114 {
 115     M68kCPU *cpu = M68K_CPU(obj);
 116     CPUM68KState *env = &cpu->env;
 117
 118     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 119     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 120     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 121     m68k_set_feature(env, M68K_FEATURE_BRAL);
 122     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 123     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 124        It's mostly backwards compatible.  */
 125     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 126     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 127     m68k_set_feature(env, M68K_FEATURE_USP);
 128     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 129     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 130 }
 131
 132 typedef struct M68kCPUInfo {
 133     const char *name;
 134     void (*instance_init)(Object *obj);
 135 } M68kCPUInfo;
 136
 137 static const M68kCPUInfo m68k_cpus[] = {
 138     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 139     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 140     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 141     { .name = "any",   .instance_init = any_cpu_initfn },
 142 };
 143
 144 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 145 {
 146     M68kCPU *cpu = M68K_CPU(dev);
 147     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 148
 149     m68k_cpu_init_gdb(cpu);
 150
 151     cpu_reset(CPU(cpu));
 152
 153     mcc->parent_realize(dev, errp);
 154 }
 155
 156 static void m68k_cpu_initfn(Object *obj)
 157 {
 158     CPUState *cs = CPU(obj);
 159     M68kCPU *cpu = M68K_CPU(obj);
 160     CPUM68KState *env = &cpu->env;
 161     static bool inited;
 162
 163     cs->env_ptr = env;
 164     cpu_exec_init(env);
 165
 166     if (tcg_enabled() && !inited) {
 167         inited = true;
 168         m68k_tcg_init();
 169     }
 170 }
 171
 172 static const VMStateDescription vmstate_m68k_cpu = {
 173     .name = "cpu",
 174     .unmigratable = 1,
 175 };
 176
 177 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 178 {
 179     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 180     CPUClass *cc = CPU_CLASS(c);
 181     DeviceClass *dc = DEVICE_CLASS(c);
 182
 183     mcc->parent_realize = dc->realize;
 184     dc->realize = m68k_cpu_realizefn;
 185
 186     mcc->parent_reset = cc->reset;
 187     cc->reset = m68k_cpu_reset;
 188
 189     cc->class_by_name = m68k_cpu_class_by_name;
 190     cc->do_interrupt = m68k_cpu_do_interrupt;
 191     cc->dump_state = m68k_cpu_dump_state;
 192     cc->set_pc = m68k_cpu_set_pc;
 193 #ifndef CONFIG_USER_ONLY
 194     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
 195 #endif
 196     dc->vmsd = &vmstate_m68k_cpu;
 197 }
 198
 199 static void register_cpu_type(const M68kCPUInfo *info)
 200 {
 201     TypeInfo type_info = {
 202         .parent = TYPE_M68K_CPU,
 203         .instance_init = info->instance_init,
 204     };
 205
 206     type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 207     type_register(&type_info);
 208     g_free((void *)type_info.name);
 209 }
 210
 211 static const TypeInfo m68k_cpu_type_info = {
 212     .name = TYPE_M68K_CPU,
 213     .parent = TYPE_CPU,
 214     .instance_size = sizeof(M68kCPU),
 215     .instance_init = m68k_cpu_initfn,
 216     .abstract = true,
 217     .class_size = sizeof(M68kCPUClass),
 218     .class_init = m68k_cpu_class_init,
 219 };
 220
 221 static void m68k_cpu_register_types(void)
 222 {
 223     int i;
 224
 225     type_register_static(&m68k_cpu_type_info);
 226     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 227         register_cpu_type(&m68k_cpus[i]);
 228     }
 229 }
 230
 231 type_init(m68k_cpu_register_types)