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
  24
  25 static void m68k_set_feature(CPUM68KState *env, int feature)
  26 {
  27     env->features |= (1u << feature);
  28 }
  29
  30 /* CPUClass::reset() */
  31 static void m68k_cpu_reset(CPUState *s)
  32 {
  33     M68kCPU *cpu = M68K_CPU(s);
  34     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(cpu);
  35     CPUM68KState *env = &cpu->env;
  36
  37     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
  38         qemu_log("CPU Reset (CPU %d)\n", s->cpu_index);
  39         log_cpu_state(env, 0);
  40     }
  41
  42     mcc->parent_reset(s);
  43
  44     memset(env, 0, offsetof(CPUM68KState, breakpoints));
  45 #if !defined(CONFIG_USER_ONLY)
  46     env->sr = 0x2700;
  47 #endif
  48     m68k_switch_sp(env);
  49     /* ??? FP regs should be initialized to NaN.  */
  50     env->cc_op = CC_OP_FLAGS;
  51     /* TODO: We should set PC from the interrupt vector.  */
  52     env->pc = 0;
  53     tlb_flush(env, 1);
  54 }
  55
  56 /* CPU models */
  57
  58 static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  59 {
  60     ObjectClass *oc;
  61
  62     if (cpu_model == NULL) {
  63         return NULL;
  64     }
  65
  66     oc = object_class_by_name(cpu_model);
  67     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  68                        object_class_is_abstract(oc))) {
  69         return NULL;
  70     }
  71     return oc;
  72 }
  73
  74 static void m5206_cpu_initfn(Object *obj)
  75 {
  76     M68kCPU *cpu = M68K_CPU(obj);
  77     CPUM68KState *env = &cpu->env;
  78
  79     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  80 }
  81
  82 static void m5208_cpu_initfn(Object *obj)
  83 {
  84     M68kCPU *cpu = M68K_CPU(obj);
  85     CPUM68KState *env = &cpu->env;
  86
  87     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  88     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
  89     m68k_set_feature(env, M68K_FEATURE_BRAL);
  90     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
  91     m68k_set_feature(env, M68K_FEATURE_USP);
  92 }
  93
  94 static void cfv4e_cpu_initfn(Object *obj)
  95 {
  96     M68kCPU *cpu = M68K_CPU(obj);
  97     CPUM68KState *env = &cpu->env;
  98
  99     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 100     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 101     m68k_set_feature(env, M68K_FEATURE_BRAL);
 102     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 103     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 104     m68k_set_feature(env, M68K_FEATURE_USP);
 105 }
 106
 107 static void any_cpu_initfn(Object *obj)
 108 {
 109     M68kCPU *cpu = M68K_CPU(obj);
 110     CPUM68KState *env = &cpu->env;
 111
 112     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 113     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 114     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 115     m68k_set_feature(env, M68K_FEATURE_BRAL);
 116     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 117     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 118        It's mostly backwards compatible.  */
 119     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 120     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 121     m68k_set_feature(env, M68K_FEATURE_USP);
 122     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 123     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 124 }
 125
 126 typedef struct M68kCPUInfo {
 127     const char *name;
 128     void (*instance_init)(Object *obj);
 129 } M68kCPUInfo;
 130
 131 static const M68kCPUInfo m68k_cpus[] = {
 132     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 133     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 134     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 135     { .name = "any",   .instance_init = any_cpu_initfn },
 136 };
 137
 138 static void m68k_cpu_initfn(Object *obj)
 139 {
 140     M68kCPU *cpu = M68K_CPU(obj);
 141     CPUM68KState *env = &cpu->env;
 142
 143     cpu_exec_init(env);
 144 }
 145
 146 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 147 {
 148     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 149     CPUClass *cc = CPU_CLASS(c);
 150
 151     mcc->parent_reset = cc->reset;
 152     cc->reset = m68k_cpu_reset;
 153
 154     cc->class_by_name = m68k_cpu_class_by_name;
 155 }
 156
 157 static void register_cpu_type(const M68kCPUInfo *info)
 158 {
 159     TypeInfo type_info = {
 160         .name = info->name,
 161         .parent = TYPE_M68K_CPU,
 162         .instance_init = info->instance_init,
 163     };
 164
 165     type_register(&type_info);
 166 }
 167
 168 static const TypeInfo m68k_cpu_type_info = {
 169     .name = TYPE_M68K_CPU,
 170     .parent = TYPE_CPU,
 171     .instance_size = sizeof(M68kCPU),
 172     .instance_init = m68k_cpu_initfn,
 173     .abstract = true,
 174     .class_size = sizeof(M68kCPUClass),
 175     .class_init = m68k_cpu_class_init,
 176 };
 177
 178 static void m68k_cpu_register_types(void)
 179 {
 180     int i;
 181
 182     type_register_static(&m68k_cpu_type_info);
 183     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 184         register_cpu_type(&m68k_cpus[i]);
 185     }
 186 }
 187
 188 type_init(m68k_cpu_register_types)