Files
86Box/src/chipset/opti5x7.c
2022-11-19 11:53:07 -05:00

211 lines
6.8 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 OPTi 82C546/82C547(Python) & 82C596/82C597(Cobra) chipsets.
* Authors: plant/nerd73,
* Miran Grca, <mgrca8@gmail.com>
* Tiseno100
*
* Copyright 2020 plant/nerd73.
* Copyright 2020 Miran Grca.
* 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>
typedef struct
{
uint8_t idx, is_pci,
regs[16];
} opti5x7_t;
#ifdef ENABLE_OPTI5X7_LOG
int opti5x7_do_log = ENABLE_OPTI5X7_LOG;
static void
opti5x7_log(const char *fmt, ...)
{
va_list ap;
if (opti5x7_do_log) {
va_start(ap, fmt);
pclog_ex(fmt, ap);
va_end(ap);
}
}
#else
# define opti5x7_log(fmt, ...)
#endif
static void
opti5x7_shadow_map(int cur_reg, opti5x7_t *dev)
{
/*
Register 4h: Cxxxx Segment
Register 5h: Dxxxx Segment
Bits 7-6: xC000-xFFFF
Bits 5-4: x8000-xBFFF
Bits 3-2: x4000-x7FFF
Bits 0-1: x0000-x3FFF
x-y
0 0 Read/Write AT bus
1 0 Read from AT - Write to DRAM
1 1 Read from DRAM - Write to DRAM
0 1 Read from DRAM (write protected)
*/
if (cur_reg == 0x06) {
if (dev->is_pci) {
mem_set_mem_state_cpu_both(0xe0000, 0x10000, ((dev->regs[6] & 1) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((dev->regs[6] & 2) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY));
mem_set_mem_state_cpu_both(0xf0000, 0x10000, ((dev->regs[6] & 4) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((dev->regs[6] & 8) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY));
} else {
mem_set_mem_state_both(0xe0000, 0x10000, ((dev->regs[6] & 1) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((dev->regs[6] & 2) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY));
mem_set_mem_state_both(0xf0000, 0x10000, ((dev->regs[6] & 4) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((dev->regs[6] & 8) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY));
}
} else {
for (int i = 0; i < 4; i++) {
if (dev->is_pci)
mem_set_mem_state_cpu_both(0xc0000 + ((cur_reg & 1) << 16) + (i << 14), 0x4000, ((dev->regs[cur_reg] & (1 << (2 * i))) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((dev->regs[cur_reg] & (2 << (2 * i))) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY));
else
mem_set_mem_state_both(0xc0000 + ((cur_reg & 1) << 16) + (i << 14), 0x4000, ((dev->regs[cur_reg] & (1 << (2 * i))) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((dev->regs[cur_reg] & (2 << (2 * i))) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY));
}
}
flushmmucache_nopc();
}
static void
opti5x7_write(uint16_t addr, uint8_t val, void *priv)
{
opti5x7_t *dev = (opti5x7_t *) priv;
switch (addr) {
case 0x22:
dev->idx = val;
break;
case 0x24:
switch (dev->idx) {
case 0x00: /* DRAM Configuration Register #1 */
dev->regs[dev->idx] = val & 0x7f;
break;
case 0x01: /* DRAM Control Register #1 */
dev->regs[dev->idx] = val;
break;
case 0x02: /* Cache Control Register #1 */
dev->regs[dev->idx] = val;
cpu_cache_ext_enabled = !!(dev->regs[0x02] & 0x0c);
cpu_update_waitstates();
break;
case 0x03: /* Cache Control Register #2 */
dev->regs[dev->idx] = val;
break;
case 0x04: /* Shadow RAM Control Register #1 */
case 0x05: /* Shadow RAM Control Register #2 */
case 0x06: /* Shadow RAM Control Register #3 */
dev->regs[dev->idx] = val;
opti5x7_shadow_map(dev->idx, dev);
break;
case 0x07: /* Tag Test Register */
case 0x08: /* CPU Cache Control Register #1 */
case 0x09: /* System Memory Function Register #1 */
case 0x0a: /* System Memory Address Decode Register #1 */
case 0x0b: /* System Memory Address Decode Register #2 */
dev->regs[dev->idx] = val;
break;
case 0x0c: /* Extended DMA Register */
dev->regs[dev->idx] = val & 0xcf;
break;
case 0x0d: /* ROMCS# Register */
case 0x0e: /* Local Master Preemption Register */
case 0x0f: /* Deturbo Control Register #1 */
case 0x10: /* Cache Write-Hit Control Register */
case 0x11: /* Master Cycle Control Register */
dev->regs[dev->idx] = val;
break;
}
opti5x7_log("OPTi 5x7: dev->regs[%02x] = %02x\n", dev->idx, dev->regs[dev->idx]);
break;
}
}
static uint8_t
opti5x7_read(uint16_t addr, void *priv)
{
opti5x7_t *dev = (opti5x7_t *) priv;
return (addr == 0x24) ? dev->regs[dev->idx] : 0xff;
}
static void
opti5x7_close(void *priv)
{
opti5x7_t *dev = (opti5x7_t *) priv;
free(dev);
}
static void *
opti5x7_init(const device_t *info)
{
opti5x7_t *dev = (opti5x7_t *) malloc(sizeof(opti5x7_t));
memset(dev, 0, sizeof(opti5x7_t));
dev->is_pci = info->local;
io_sethandler(0x0022, 0x0001, opti5x7_read, NULL, NULL, opti5x7_write, NULL, NULL, dev);
io_sethandler(0x0024, 0x0001, opti5x7_read, NULL, NULL, opti5x7_write, NULL, NULL, dev);
device_add(&port_92_device);
return dev;
}
const device_t opti5x7_device = {
.name = "OPTi 82C5x6/82C5x7",
.internal_name = "opti5x7",
.flags = 0,
.local = 0,
.init = opti5x7_init,
.close = opti5x7_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_t opti5x7_pci_device = {
.name = "OPTi 82C5x6/82C5x7 (PCI)",
.internal_name = "opti5x7_pci",
.flags = 0,
.local = 1,
.init = opti5x7_init,
.close = opti5x7_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};