170 lines
4.8 KiB
C
170 lines
4.8 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 ETEQ Cheetah ET6000 chipset.
|
|
*
|
|
*
|
|
*
|
|
* 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/pit.h>
|
|
#include <86box/plat_unused.h>
|
|
#include <86box/port_92.h>
|
|
#include <86box/chipset.h>
|
|
|
|
#define INDEX (dev->index - 0x10)
|
|
|
|
typedef struct et6000_t {
|
|
uint8_t index;
|
|
uint8_t regs[256];
|
|
} et6000_t;
|
|
|
|
#ifdef ENABLE_ET6000_LOG
|
|
int et6000_do_log = ENABLE_ET6000_LOG;
|
|
|
|
static void
|
|
et6000_log(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
if (et6000_do_log) {
|
|
va_start(ap, fmt);
|
|
pclog_ex(fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
}
|
|
#else
|
|
# define et6000_log(fmt, ...)
|
|
#endif
|
|
|
|
static void
|
|
et6000_shadow_control(int base, int size, int can_read, int can_write)
|
|
{
|
|
mem_set_mem_state_both(base, size, (can_read ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | (can_write ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY));
|
|
flushmmucache_nopc();
|
|
}
|
|
|
|
static void
|
|
et6000_write(uint16_t addr, uint8_t val, void *priv)
|
|
{
|
|
et6000_t *dev = (et6000_t *) priv;
|
|
|
|
switch (addr) {
|
|
case 0x22:
|
|
dev->index = val;
|
|
break;
|
|
case 0x23:
|
|
switch (INDEX) {
|
|
case 0: /* System Configuration Register */
|
|
dev->regs[INDEX] = val & 0xdf;
|
|
et6000_shadow_control(0xa0000, 0x20000, val & 1, val & 1);
|
|
refresh_at_enable = !(val & 0x10);
|
|
break;
|
|
|
|
case 1: /* CACHE Configuration and Non-Cacheable Block Size */
|
|
dev->regs[INDEX] = val & 0xf0;
|
|
break;
|
|
|
|
case 2: /* Non-Cacheable Block Address Register */
|
|
dev->regs[INDEX] = val & 0xfe;
|
|
break;
|
|
|
|
case 3: /* DRAM Bank and Type Configuration Register */
|
|
dev->regs[INDEX] = val;
|
|
break;
|
|
|
|
case 4: /* DRAM Configuration Register */
|
|
dev->regs[INDEX] = val;
|
|
et6000_shadow_control(0xc0000, 0x10000, (dev->regs[0x15] & 2) && (val & 0x20), (dev->regs[0x15] & 2) && (val & 0x20) && (dev->regs[0x15] & 1));
|
|
et6000_shadow_control(0xd0000, 0x10000, (dev->regs[0x15] & 8) && (val & 0x20), (dev->regs[0x15] & 8) && (val & 0x20) && (dev->regs[0x15] & 4));
|
|
break;
|
|
|
|
case 5: /* Shadow RAM Configuration Register */
|
|
dev->regs[INDEX] = val;
|
|
et6000_shadow_control(0xc0000, 0x10000, (val & 2) && (dev->regs[0x14] & 0x20), (val & 2) && (dev->regs[0x14] & 0x20) && (val & 1));
|
|
et6000_shadow_control(0xd0000, 0x10000, (val & 8) && (dev->regs[0x14] & 0x20), (val & 8) && (dev->regs[0x14] & 0x20) && (val & 4));
|
|
et6000_shadow_control(0xe0000, 0x10000, val & 0x20, (val & 0x20) && (val & 0x10));
|
|
et6000_shadow_control(0xf0000, 0x10000, val & 0x40, !(val & 0x40));
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
et6000_log("ET6000: dev->regs[%02x] = %02x\n", dev->index, dev->regs[dev->index]);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static uint8_t
|
|
et6000_read(uint16_t addr, void *priv)
|
|
{
|
|
const et6000_t *dev = (et6000_t *) priv;
|
|
|
|
return ((addr == 0x23) && (INDEX >= 0) && (INDEX <= 5)) ? dev->regs[INDEX] : 0xff;
|
|
}
|
|
|
|
static void
|
|
et6000_close(void *priv)
|
|
{
|
|
et6000_t *dev = (et6000_t *) priv;
|
|
|
|
free(dev);
|
|
}
|
|
|
|
static void *
|
|
et6000_init(UNUSED(const device_t *info))
|
|
{
|
|
et6000_t *dev = (et6000_t *) malloc(sizeof(et6000_t));
|
|
memset(dev, 0, sizeof(et6000_t));
|
|
|
|
/* Port 92h */
|
|
device_add(&port_92_device);
|
|
|
|
/* Defaults */
|
|
dev->regs[3] = 1;
|
|
|
|
/* Shadow Programming */
|
|
et6000_shadow_control(0xf0000, 0x10000, 0, 1);
|
|
|
|
io_sethandler(0x0022, 2, et6000_read, NULL, NULL, et6000_write, NULL, NULL, dev); /* Ports 22h-23h: ETEQ Cheetah ET6000 */
|
|
|
|
return dev;
|
|
}
|
|
|
|
const device_t et6000_device = {
|
|
.name = "ETEQ Cheetah ET6000",
|
|
.internal_name = "et6000",
|
|
.flags = 0,
|
|
.local = 0,
|
|
.init = et6000_init,
|
|
.close = et6000_close,
|
|
.reset = NULL,
|
|
{ .available = NULL },
|
|
.speed_changed = NULL,
|
|
.force_redraw = NULL,
|
|
.config = NULL
|
|
};
|