/*

 * QEMU VMPort emulation

 *

 * Copyright (C) 2007 Hervé Poussineau

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "hw.h"

#include "isa.h"

#include "pc.h"

#include "sysemu.h"

//#define VMPORT_DEBUG

#define VMPORT_CMD_GETVERSION 0x0a

#define VMPORT_CMD_GETRAMSIZE 0x14

#define VMPORT_ENTRIES 0x2c

#define VMPORT_MAGIC   0x564D5868

typedef struct _VMPortState

{

    IOPortReadFunc *func[VMPORT_ENTRIES];

    void *opaque[VMPORT_ENTRIES];

} VMPortState;

static VMPortState port_state;

void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque)

{

    if (command >= VMPORT_ENTRIES)

        return;

    port_state.func[command] = func;

    port_state.opaque[command] = opaque;

}

static uint32_t vmport_ioport_read(void *opaque, uint32_t addr)

{

    VMPortState *s = opaque;

    CPUState *env = cpu_single_env;

    unsigned char command;

    uint32_t eax;

    eax = env->regs[R_EAX];

    if (eax != VMPORT_MAGIC)

        return eax;

    command = env->regs[R_ECX];

    if (command >= VMPORT_ENTRIES)

        return eax;

    if (!s->func[command])

    {

#ifdef VMPORT_DEBUG

        fprintf(stderr, "vmport: unknown command %x\n", command);

#endif

        return eax;

    }

    return s->func[command](s->opaque[command], addr);

}

static void vmport_ioport_write(void *opaque, uint32_t addr, uint32_t val)

{

    CPUState *env = cpu_single_env;

    env->regs[R_EAX] = vmport_ioport_read(opaque, addr);

}

static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)

{

    CPUState *env = cpu_single_env;

    env->regs[R_EBX] = VMPORT_MAGIC;

    return 6;

}

static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)

{

    CPUState *env = cpu_single_env;

    env->regs[R_EBX] = 0x1177;

    return ram_size;

}

void vmport_init(void)

{

    register_ioport_read(0x5658, 1, 4, vmport_ioport_read, &port_state);

    register_ioport_write(0x5658, 1, 4, vmport_ioport_write, &port_state);

    /* Register some generic port commands */

    vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);

    vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);

}