Archipelago » qemu

/*

 * QEMU Motorola 68k CPU

 *

 * Copyright (c) 2012 SUSE LINUX Products GmbH

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see

 * <http://www.gnu.org/licenses/lgpl-2.1.html>

 */

#include "cpu.h"

#include "qemu-common.h"

#include "migration/vmstate.h"

static void m68k_cpu_set_pc(CPUState *cs, vaddr value)

{

    M68kCPU *cpu = M68K_CPU(cs);

    cpu->env.pc = value;

}

static void m68k_set_feature(CPUM68KState *env, int feature)

{

    env->features |= (1u << feature);

}

/* CPUClass::reset() */

static void m68k_cpu_reset(CPUState *s)

{

    M68kCPU *cpu = M68K_CPU(s);

    M68kCPUClass *mcc = M68K_CPU_GET_CLASS(cpu);

    CPUM68KState *env = &cpu->env;

    mcc->parent_reset(s);

    memset(env, 0, offsetof(CPUM68KState, breakpoints));

#if !defined(CONFIG_USER_ONLY)

    env->sr = 0x2700;

#endif

    m68k_switch_sp(env);

    /* ??? FP regs should be initialized to NaN.  */

    env->cc_op = CC_OP_FLAGS;

    /* TODO: We should set PC from the interrupt vector.  */

    env->pc = 0;

    tlb_flush(env, 1);

}

/* CPU models */

static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)

{

    ObjectClass *oc;

    char *typename;

    if (cpu_model == NULL) {

        return NULL;

    }

    typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);

    oc = object_class_by_name(typename);

    g_free(typename);

    if (oc != NULL && (object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL ||

                       object_class_is_abstract(oc))) {

        return NULL;

    }

    return oc;

}

static void m5206_cpu_initfn(Object *obj)

{

    M68kCPU *cpu = M68K_CPU(obj);

    CPUM68KState *env = &cpu->env;

    m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);

}

static void m5208_cpu_initfn(Object *obj)

{

    M68kCPU *cpu = M68K_CPU(obj);

    CPUM68KState *env = &cpu->env;

    m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);

    m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);

    m68k_set_feature(env, M68K_FEATURE_BRAL);

    m68k_set_feature(env, M68K_FEATURE_CF_EMAC);

    m68k_set_feature(env, M68K_FEATURE_USP);

}

static void cfv4e_cpu_initfn(Object *obj)

{

    M68kCPU *cpu = M68K_CPU(obj);

    CPUM68KState *env = &cpu->env;

    m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);

    m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);

    m68k_set_feature(env, M68K_FEATURE_BRAL);

    m68k_set_feature(env, M68K_FEATURE_CF_FPU);

    m68k_set_feature(env, M68K_FEATURE_CF_EMAC);

    m68k_set_feature(env, M68K_FEATURE_USP);

}

static void any_cpu_initfn(Object *obj)

{

    M68kCPU *cpu = M68K_CPU(obj);

    CPUM68KState *env = &cpu->env;

    m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);

    m68k_set_feature(env, M68K_FEATURE_CF_ISA_B);

    m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC);

    m68k_set_feature(env, M68K_FEATURE_BRAL);

    m68k_set_feature(env, M68K_FEATURE_CF_FPU);

    /* MAC and EMAC are mututally exclusive, so pick EMAC.

       It's mostly backwards compatible.  */

    m68k_set_feature(env, M68K_FEATURE_CF_EMAC);

    m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B);

    m68k_set_feature(env, M68K_FEATURE_USP);

    m68k_set_feature(env, M68K_FEATURE_EXT_FULL);

    m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);

}

typedef struct M68kCPUInfo {

    const char *name;

    void (*instance_init)(Object *obj);

} M68kCPUInfo;

static const M68kCPUInfo m68k_cpus[] = {

    { .name = "m5206", .instance_init = m5206_cpu_initfn },

    { .name = "m5208", .instance_init = m5208_cpu_initfn },

    { .name = "cfv4e", .instance_init = cfv4e_cpu_initfn },

    { .name = "any",   .instance_init = any_cpu_initfn },

};

static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)

{

    M68kCPU *cpu = M68K_CPU(dev);

    M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);

    m68k_cpu_init_gdb(cpu);

    cpu_reset(CPU(cpu));

    mcc->parent_realize(dev, errp);

}

static void m68k_cpu_initfn(Object *obj)

{

    CPUState *cs = CPU(obj);

    M68kCPU *cpu = M68K_CPU(obj);

    CPUM68KState *env = &cpu->env;

    static bool inited;

    cs->env_ptr = env;

    cpu_exec_init(env);

    if (tcg_enabled() && !inited) {

        inited = true;

        m68k_tcg_init();

    }

}

static const VMStateDescription vmstate_m68k_cpu = {

    .name = "cpu",

    .unmigratable = 1,

};

static void m68k_cpu_class_init(ObjectClass *c, void *data)

{

    M68kCPUClass *mcc = M68K_CPU_CLASS(c);

    CPUClass *cc = CPU_CLASS(c);

    DeviceClass *dc = DEVICE_CLASS(c);

    mcc->parent_realize = dc->realize;

    dc->realize = m68k_cpu_realizefn;

    mcc->parent_reset = cc->reset;

    cc->reset = m68k_cpu_reset;

    cc->class_by_name = m68k_cpu_class_by_name;

    cc->do_interrupt = m68k_cpu_do_interrupt;

    cc->dump_state = m68k_cpu_dump_state;

    cc->set_pc = m68k_cpu_set_pc;

    cc->gdb_read_register = m68k_cpu_gdb_read_register;

    cc->gdb_write_register = m68k_cpu_gdb_write_register;

#ifndef CONFIG_USER_ONLY

    cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;

#endif

    dc->vmsd = &vmstate_m68k_cpu;

    cc->gdb_num_core_regs = 18;

}

static void register_cpu_type(const M68kCPUInfo *info)

{

    TypeInfo type_info = {

        .parent = TYPE_M68K_CPU,

        .instance_init = info->instance_init,

    };

    type_info.name = g_strdup_printf("%s-" TYPE_M68K_CPU, info->name);

    type_register(&type_info);

    g_free((void *)type_info.name);

}

static const TypeInfo m68k_cpu_type_info = {

    .name = TYPE_M68K_CPU,

    .parent = TYPE_CPU,

    .instance_size = sizeof(M68kCPU),

    .instance_init = m68k_cpu_initfn,

    .abstract = true,

    .class_size = sizeof(M68kCPUClass),

    .class_init = m68k_cpu_class_init,

};

static void m68k_cpu_register_types(void)

{

    int i;

    type_register_static(&m68k_cpu_type_info);

    for (i = 0; i < ARRAY_SIZE(m68k_cpus); i++) {

        register_cpu_type(&m68k_cpus[i]);

    }

}

type_init(m68k_cpu_register_types)