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 bool m68k_cpu_has_work(CPUState *cs)
  34 {
  35     return cs->interrupt_request & CPU_INTERRUPT_HARD;
  36 }
  37
  38 static void m68k_set_feature(CPUM68KState *env, int feature)
  39 {
  40     env->features |= (1u << feature);
  41 }
  42
  43 /* CPUClass::reset() */
  44 static void m68k_cpu_reset(CPUState *s)
  45 {
  46     M68kCPU *cpu = M68K_CPU(s);
  47     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(cpu);
  48     CPUM68KState *env = &cpu->env;
  49
  50     mcc->parent_reset(s);
  51
  52     memset(env, 0, offsetof(CPUM68KState, features));
  53 #if !defined(CONFIG_USER_ONLY)
  54     env->sr = 0x2700;
  55 #endif
  56     m68k_switch_sp(env);
  57     /* ??? FP regs should be initialized to NaN.  */
  58     env->cc_op = CC_OP_FLAGS;
  59     /* TODO: We should set PC from the interrupt vector.  */
  60     env->pc = 0;
  61     tlb_flush(env, 1);
  62 }
  63
  64 /* CPU models */
  65
  66 static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
  67 {
  68     ObjectClass *oc;
  69     char *typename;
  70
  71     if (cpu_model == NULL) {
  72         return NULL;
  73     }
  74
  75     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
  76     oc = object_class_by_name(typename);
  77     g_free(typename);
  78     if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||
  79                        object_class_is_abstract(oc))) {
  80         return NULL;
  81     }
  82     return oc;
  83 }
  84
  85 static void m5206_cpu_initfn(Object *obj)
  86 {
  87     M68kCPU *cpu = M68K_CPU(obj);
  88     CPUM68KState *env = &cpu->env;
  89
  90     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
  91 }
  92
  93 static void m5208_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_APLUSC);
 100     m68k_set_feature(env, M68K_FEATURE_BRAL);
 101     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 102     m68k_set_feature(env, M68K_FEATURE_USP);
 103 }
 104
 105 static void cfv4e_cpu_initfn(Object *obj)
 106 {
 107     M68kCPU *cpu = M68K_CPU(obj);
 108     CPUM68KState *env = &cpu->env;
 109
 110     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 111     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 112     m68k_set_feature(env, M68K_FEATURE_BRAL);
 113     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 114     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 115     m68k_set_feature(env, M68K_FEATURE_USP);
 116 }
 117
 118 static void any_cpu_initfn(Object *obj)
 119 {
 120     M68kCPU *cpu = M68K_CPU(obj);
 121     CPUM68KState *env = &cpu->env;
 122
 123     m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
 124     m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);
 125     m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);
 126     m68k_set_feature(env, M68K_FEATURE_BRAL);
 127     m68k_set_feature(env, M68K_FEATURE_CF_FPU);
 128     /* MAC and EMAC are mututally exclusive, so pick EMAC.
 129        It's mostly backwards compatible.  */
 130     m68k_set_feature(env, M68K_FEATURE_CF_EMAC);
 131     m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);
 132     m68k_set_feature(env, M68K_FEATURE_USP);
 133     m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
 134     m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
 135 }
 136
 137 typedef struct M68kCPUInfo {
 138     const char *name;
 139     void (*instance_init)(Object *obj);
 140 } M68kCPUInfo;
 141
 142 static const M68kCPUInfo m68k_cpus[] = {
 143     { .name = "m5206", .instance_init = m5206_cpu_initfn },
 144     { .name = "m5208", .instance_init = m5208_cpu_initfn },
 145     { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },
 146     { .name = "any",   .instance_init = any_cpu_initfn },
 147 };
 148
 149 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 150 {
 151     CPUState *cs = CPU(dev);
 152     M68kCPU *cpu = M68K_CPU(dev);
 153     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 154
 155     m68k_cpu_init_gdb(cpu);
 156
 157     cpu_reset(cs);
 158     qemu_init_vcpu(cs);
 159
 160     mcc->parent_realize(dev, errp);
 161 }
 162
 163 static void m68k_cpu_initfn(Object *obj)
 164 {
 165     CPUState *cs = CPU(obj);
 166     M68kCPU *cpu = M68K_CPU(obj);
 167     CPUM68KState *env = &cpu->env;
 168     static bool inited;
 169
 170     cs->env_ptr = env;
 171     cpu_exec_init(env);
 172
 173     if (tcg_enabled() && !inited) {
 174         inited = true;
 175         m68k_tcg_init();
 176     }
 177 }
 178
 179 static const VMStateDescription vmstate_m68k_cpu = {
 180     .name = "cpu",
 181     .unmigratable = 1,
 182 };
 183
 184 static void m68k_cpu_class_init(ObjectClass *c, void *data)
 185 {
 186     M68kCPUClass *mcc = M68K_CPU_CLASS(c);
 187     CPUClass *cc = CPU_CLASS(c);
 188     DeviceClass *dc = DEVICE_CLASS(c);
 189
 190     mcc->parent_realize = dc->realize;
 191     dc->realize = m68k_cpu_realizefn;
 192
 193     mcc->parent_reset = cc->reset;
 194     cc->reset = m68k_cpu_reset;
 195
 196     cc->class_by_name = m68k_cpu_class_by_name;
 197     cc->has_work = m68k_cpu_has_work;
 198     cc->do_interrupt = m68k_cpu_do_interrupt;
 199     cc->dump_state = m68k_cpu_dump_state;
 200     cc->set_pc = m68k_cpu_set_pc;
 201     cc->gdb_read_register = m68k_cpu_gdb_read_register;
 202     cc->gdb_write_register = m68k_cpu_gdb_write_register;
 203 #ifdef CONFIG_USER_ONLY
 204     cc->handle_mmu_fault = m68k_cpu_handle_mmu_fault;
 205 #else
 206     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
 207 #endif
 208     dc->vmsd = &vmstate_m68k_cpu;
 209     cc->gdb_num_core_regs = 18;
 210     cc->gdb_core_xml_file = "cf-core.xml";
 211 }
 212
 213 static void register_cpu_type(const M68kCPUInfo *info)
 214 {
 215     TypeInfo type_info = {
 216         .parent = TYPE_M68K_CPU,
 217         .instance_init = info->instance_init,
 218     };
 219
 220     type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);
 221     type_register(&type_info);
 222     g_free((void *)type_info.name);
 223 }
 224
 225 static const TypeInfo m68k_cpu_type_info = {
 226     .name = TYPE_M68K_CPU,
 227     .parent = TYPE_CPU,
 228     .instance_size = sizeof(M68kCPU),
 229     .instance_init = m68k_cpu_initfn,
 230     .abstract = true,
 231     .class_size = sizeof(M68kCPUClass),
 232     .class_init = m68k_cpu_class_init,
 233 };
 234
 235 static void m68k_cpu_register_types(void)
 236 {
 237     int i;
 238
 239     type_register_static(&m68k_cpu_type_info);
 240     for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {
 241         register_cpu_type(&m68k_cpus[i]);
 242     }
 243 }
 244
 245 type_init(m68k_cpu_register_types)