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/*
* 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);
}
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