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Properly implemented the ACC 2046/2168

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Based on the ACC 2046 datasheet. 2168 is just the Green variation of it.
This commit is contained in:
Panagiotis
2021-01-01 20:07:39 +02:00
committed by GitHub
parent 62e89dbea9
commit 9b9f2d7c7c
1 changed files with 109 additions and 39 deletions
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148
src/chipset/acc2168.c
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@@ -6,13 +6,15 @@
*
* This file is part of the 86Box distribution.
*
* Implementation of the ACC 2168 chipset
* Implementation of the ACC 2046/2168 chipset
*
*
*
* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
* Tiseno100
*
* Copyright 2019 Sarah Walker.
* Copyright 2021 Tiseno100.
*/
#include <stdio.h>
#include <stdint.h>
@@ -28,84 +30,152 @@
#include <86box/port_92.h>
#include <86box/chipset.h>
#define enabled_shadow (MEM_READ_INTERNAL | ((dev->regs[0x02] & 0x20) ? MEM_WRITE_DISABLED : MEM_WRITE_INTERNAL))
#define disabled_shadow (MEM_READ_EXTANY | MEM_WRITE_EXTANY)
#define ENABLED_SHADOW (MEM_READ_INTERNAL | ((dev->regs[0x02] & 0x20) ? MEM_WRITE_DISABLED : MEM_WRITE_INTERNAL))
#define DISABLED_SHADOW (MEM_READ_EXTANY | MEM_WRITE_EXTANY)
#define SHADOW_ADDR ((i <= 1) ? (0xc0000 + (i << 15)) : (0xd0000 + ((i - 2) << 16)))
#define SHADOW_SIZE ((i <= 1) ? 0x8000 : 0x10000)
#define SHADOW_RECALC ((dev->regs[0x02] & (1 << i)) ? ENABLED_SHADOW : DISABLED_SHADOW)
typedef struct acc2168_t
{
int reg_idx;
uint8_t regs[256];
uint8_t reg_idx, regs[256];
} acc2168_t;
static void
static void
acc2168_shadow_recalc(acc2168_t *dev)
{
mem_set_mem_state_both(0xc0000, 0x8000, ((dev->regs[0x02] & 0x01) ? enabled_shadow : disabled_shadow));
mem_set_mem_state_both(0xc8000, 0x8000, ((dev->regs[0x02] & 0x02) ? enabled_shadow : disabled_shadow));
mem_set_mem_state_both(0xd0000, 0x10000, ((dev->regs[0x02] & 0x04) ? enabled_shadow : disabled_shadow));
mem_set_mem_state_both(0xe0000, 0x10000, ((dev->regs[0x02] & 0x08) ? enabled_shadow : disabled_shadow));
mem_set_mem_state_both(0xf0000, 0x10000, ((dev->regs[0x02] & 0x10) ? enabled_shadow : disabled_shadow));
for (uint32_t i = 0; i < 5; i++)
mem_set_mem_state_both(SHADOW_ADDR, SHADOW_SIZE, SHADOW_RECALC);
}
static void
static void
acc2168_write(uint16_t addr, uint8_t val, void *p)
{
acc2168_t *dev = (acc2168_t *)p;
if (!(addr & 1))
dev->reg_idx = val;
else {
dev->regs[dev->reg_idx] = val;
switch (addr)
{
case 0xf2:
dev->reg_idx = val;
break;
case 0xf3:
pclog("dev->regs[%02x] = %02x\n", dev->reg_idx, val);
switch (dev->reg_idx)
{
case 0x00:
dev->regs[dev->reg_idx] = val;
break;
switch (dev->reg_idx) {
case 0x02:
acc2168_shadow_recalc(dev);
break;
}
case 0x01:
dev->regs[dev->reg_idx] = val & 0xd3;
cpu_update_waitstates();
break;
case 0x02:
dev->regs[dev->reg_idx] = val & 0x7f;
acc2168_shadow_recalc(dev);
break;
case 0x03:
dev->regs[dev->reg_idx] = val & 0x1f;
break;
case 0x04:
dev->regs[dev->reg_idx] = val;
cpu_cache_ext_enabled = !!(val & 0x01);
cpu_update_waitstates();
break;
case 0x05:
dev->regs[dev->reg_idx] = val & 0xf3;
break;
case 0x06:
case 0x07:
dev->regs[dev->reg_idx] = val & 0x1f;
break;
case 0x08:
dev->regs[dev->reg_idx] = val & 0x0f;
break;
case 0x09:
dev->regs[dev->reg_idx] = val & 0x03;
break;
case 0x0a:
case 0x0b:
case 0x0c:
case 0x0d:
case 0x0e:
case 0x0f:
case 0x10:
case 0x11:
dev->regs[dev->reg_idx] = val;
break;
case 0x12:
dev->regs[dev->reg_idx] = val & 0xbb;
break;
case 0x18:
dev->regs[dev->reg_idx] = val & 0x77;
break;
case 0x19:
dev->regs[dev->reg_idx] = val & 0xfb;
break;
case 0x1a:
dev->regs[dev->reg_idx] = val;
cpu_cache_int_enabled = !(val & 0x40);
cpu_update_waitstates();
break;
case 0x1b:
dev->regs[dev->reg_idx] = val & 0xef;
break;
}
break;
}
}
static uint8_t
static uint8_t
acc2168_read(uint16_t addr, void *p)
{
acc2168_t *dev = (acc2168_t *)p;
if (!(addr & 1))
return dev->reg_idx;
return dev->regs[dev->reg_idx];
return (addr == 0xf3) ? dev->regs[dev->reg_idx] : dev->reg_idx;
}
static void
acc2168_close(void *priv)
{
acc2168_t *dev = (acc2168_t *) priv;
acc2168_t *dev = (acc2168_t *)priv;
free(dev);
}
static void *
acc2168_init(const device_t *info)
{
acc2168_t *dev = (acc2168_t *)malloc(sizeof(acc2168_t));
memset(dev, 0, sizeof(acc2168_t));
io_sethandler(0x00f2, 0x0002,
acc2168_read, NULL, NULL, acc2168_write, NULL, NULL, dev);
device_add(&port_92_inv_device);
device_add(&port_92_device);
io_sethandler(0x00f2, 0x0002, acc2168_read, NULL, NULL, acc2168_write, NULL, NULL, dev);
return dev;
}
const device_t acc2168_device = {
"ACC 2168",
"ACC 2046/2168",
0,
0,
acc2168_init, acc2168_close, NULL,
{ NULL }, NULL, NULL,
NULL
};
acc2168_init,
acc2168_close,
NULL,
{NULL},
NULL,
NULL,
NULL};