146 lines
3.0 KiB
C
146 lines
3.0 KiB
C
/*
|
|
* 86Box A hypervisor and IBM PC system emulator that specializes in
|
|
* running old operating systems and software designed for IBM
|
|
* PC systems and compatibles from 1981 through fairly recent
|
|
* system designs based on the PCI bus.
|
|
*
|
|
* This file is part of the 86Box distribution.
|
|
*
|
|
* Implementation of the ALi M1217 chipset.
|
|
*
|
|
* Note: This chipset has no datasheet, everything were done via
|
|
* reverse engineering the BIOS of various machines using it.
|
|
*
|
|
* Authors: Tiseno100
|
|
*
|
|
* Copyright 2021 Tiseno100
|
|
*
|
|
*/
|
|
|
|
#include <stdarg.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <wchar.h>
|
|
#define HAVE_STDARG_H
|
|
#include <86box/86box.h>
|
|
#include "cpu.h"
|
|
#include <86box/timer.h>
|
|
#include <86box/io.h>
|
|
#include <86box/device.h>
|
|
#include <86box/mem.h>
|
|
#include <86box/port_92.h>
|
|
#include <86box/chipset.h>
|
|
|
|
|
|
#ifdef ENABLE_ALI1217_LOG
|
|
int ali1217_do_log = ENABLE_ALI1217_LOG;
|
|
static void
|
|
ali1217_log(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
if (ali1217_do_log)
|
|
{
|
|
va_start(ap, fmt);
|
|
pclog_ex(fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
}
|
|
#else
|
|
#define ali1217_log(fmt, ...)
|
|
#endif
|
|
|
|
typedef struct
|
|
{
|
|
uint8_t index, regs[256];
|
|
int cfg_locked;
|
|
} ali1217_t;
|
|
|
|
static void ali1217_shadow_recalc(int reg_15, ali1217_t *dev)
|
|
{
|
|
for (uint8_t i = 0; i < 4; i++)
|
|
mem_set_mem_state_both((reg_15 ? 0xe0000 : 0xc0000) + (i << 15), 0x8000, ((dev->regs[0x14 + reg_15] & (1 << (i * 2))) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((dev->regs[0x14 + reg_15] & (1 << ((i * 2) + 1))) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY));
|
|
|
|
flushmmucache_nopc();
|
|
}
|
|
|
|
static void
|
|
ali1217_write(uint16_t addr, uint8_t val, void *priv)
|
|
{
|
|
ali1217_t *dev = (ali1217_t *)priv;
|
|
|
|
switch (addr)
|
|
{
|
|
case 0x22:
|
|
dev->index = val;
|
|
break;
|
|
case 0x23:
|
|
if (dev->index != 0x13)
|
|
ali1217_log("ALi M1217: dev->regs[%02x] = %02x\n", dev->index, val);
|
|
else
|
|
dev->cfg_locked = !(val == 0xc5);
|
|
|
|
if (!dev->cfg_locked)
|
|
{
|
|
dev->regs[dev->index] = val;
|
|
|
|
if ((dev->index == 0x14) || (dev->index == 0x15))
|
|
ali1217_shadow_recalc(dev->index & 1, dev);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static uint8_t
|
|
ali1217_read(uint16_t addr, void *priv)
|
|
{
|
|
ali1217_t *dev = (ali1217_t *)priv;
|
|
|
|
return (addr == 0x23) ? dev->regs[dev->index] : 0xff;
|
|
}
|
|
|
|
static void
|
|
ali1217_close(void *priv)
|
|
{
|
|
ali1217_t *dev = (ali1217_t *)priv;
|
|
|
|
free(dev);
|
|
}
|
|
|
|
static void *
|
|
ali1217_init(const device_t *info)
|
|
{
|
|
ali1217_t *dev = (ali1217_t *)malloc(sizeof(ali1217_t));
|
|
memset(dev, 0, sizeof(ali1217_t));
|
|
|
|
device_add(&port_92_device);
|
|
|
|
dev->cfg_locked = 1;
|
|
|
|
/*
|
|
|
|
ALi M1217 Ports
|
|
|
|
22h Index Port
|
|
23h Data Port
|
|
|
|
*/
|
|
io_sethandler(0x0022, 0x0002, ali1217_read, NULL, NULL, ali1217_write, NULL, NULL, dev);
|
|
|
|
return dev;
|
|
}
|
|
|
|
const device_t ali1217_device = {
|
|
"ALi M1217",
|
|
0,
|
|
0,
|
|
ali1217_init,
|
|
ali1217_close,
|
|
NULL,
|
|
{NULL},
|
|
NULL,
|
|
NULL,
|
|
NULL};
|