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", env->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 void m5206_cpu_initfn(Object *obj)
  59 {
  60     M68kCPU *cpu = M68K_CPU(obj);
  61     CPUM68KState *env = &cpu->env;
  62
  63     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  64 }
  65
  66 static void m5208_cpu_initfn(Object *obj)
  67 {
  68     M68kCPU *cpu = M68K_CPU(obj);
  69     CPUM68KState *env = &cpu->env;
  70
  71     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  72     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
  73     m68k_set_feature(env, M68K_FEATURE_BRAL);
  74     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
  75     m68k_set_feature(env, M68K_FEATURE_USP);
  76 }
  77
  78 static void cfv4e_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     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
  85     m68k_set_feature(env, M68K_FEATURE_BRAL);
  86     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
  87     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
  88     m68k_set_feature(env, M68K_FEATURE_USP);
  89 }
  90
  91 static void any_cpu_initfn(Object *obj)
  92 {
  93     M68kCPU *cpu = M68K_CPU(obj);
  94     CPUM68KState *env = &cpu->env;
  95
  96     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  97     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
  98     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
  99     m68k_set_feature(env, M68K_FEATURE_BRAL);
 100     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 101     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 102        It's mostly backwards compatible.  */
 103     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 104     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 105     m68k_set_feature(env, M68K_FEATURE_USP);
 106     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 107     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 108 }
 109
 110 typedef struct M68kCPUInfo {
 111     const char *name;
 112     void (*instance_init)(Object *obj);
 113 } M68kCPUInfo;
 114
 115 static const M68kCPUInfo m68k_cpus[] = {
 116     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 117     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 118     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 119     { .name = "any",   .instance_init = any_cpu_initfn },
 120 };
 121
 122 static void m68k_cpu_initfn(Object *obj)
 123 {
 124     M68kCPU *cpu = M68K_CPU(obj);
 125     CPUM68KState *env = &cpu->env;
 126
 127     cpu_exec_init(env);
 128 }
 129
 130 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 131 {
 132     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 133     CPUClass *cc = CPU_CLASS(c);
 134
 135     mcc->parent_reset = cc->reset;
 136     cc->reset = m68k_cpu_reset;
 137 }
 138
 139 static void register_cpu_type(const M68kCPUInfo *info)
 140 {
 141     TypeInfo type_info = {
 142         .name = info->name,
 143         .parent = TYPE_M68K_CPU,
 144         .instance_init = info->instance_init,
 145     };
 146
 147     type_register_static(&type_info);
 148 }
 149
 150 static const TypeInfo m68k_cpu_type_info = {
 151     .name = TYPE_M68K_CPU,
 152     .parent = TYPE_CPU,
 153     .instance_size = sizeof(M68kCPU),
 154     .instance_init = m68k_cpu_initfn,
 155     .abstract = true,
 156     .class_size = sizeof(M68kCPUClass),
 157     .class_init = m68k_cpu_class_init,
 158 };
 159
 160 static void m68k_cpu_register_types(void)
 161 {
 162     int i;
 163
 164     type_register_static(&m68k_cpu_type_info);
 165     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 166         register_cpu_type(&m68k_cpus[i]);
 167     }
 168 }
 169
 170 type_init(m68k_cpu_register_types)