claunia/86Box
1
0
Fork 0
Code Issues Pull Requests Actions 3 Packages Projects Releases Wiki Activity

Initial submission of the PCem-Experimental source code.

Browse Source
This commit is contained in:
OBattler
2016-06-26 00:34:39 +02:00
parent 09d7c4384f
commit fd2a5bc9f5
610 changed files with 184352 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

86
src/ali1429.c Normal file
View File

@@ -0,0 +1,86 @@
#include <string.h>
#include "ibm.h"
#include "io.h"
#include "mem.h"
#include "cpu.h"
#include "ali1429.h"
static int ali1429_index;
static uint8_t ali1429_regs[256];
static void ali1429_recalc()
{
int c;
for (c = 0; c < 8; c++)
{
uint32_t base = 0xc0000 + (c << 15);
if (ali1429_regs[0x13] & (1 << c))
{
switch (ali1429_regs[0x14] & 3)
{
case 0:
mem_set_mem_state(base, 0x8000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
break;
case 1:
mem_set_mem_state(base, 0x8000, MEM_READ_INTERNAL | MEM_WRITE_EXTERNAL);
break;
case 2:
mem_set_mem_state(base, 0x8000, MEM_READ_EXTERNAL | MEM_WRITE_INTERNAL);
break;
case 3:
mem_set_mem_state(base, 0x8000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
break;
}
}
else
mem_set_mem_state(base, 0x8000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
}
flushmmucache();
}
void ali1429_write(uint16_t port, uint8_t val, void *priv)
{
int c;
if (!(port & 1))
ali1429_index = val;
else
{
ali1429_regs[ali1429_index] = val;
// pclog("ALI1429 write %02X %02X %04X:%04X %i\n",ali1429_index,val,CS,pc,ins);
switch (ali1429_index)
{
case 0x13:
ali1429_recalc();
break;
case 0x14:
shadowbios = val & 1;
shadowbios_write = val & 2;
ali1429_recalc();
break;
}
}
}
uint8_t ali1429_read(uint16_t port, void *priv)
{
if (!(port & 1))
return ali1429_index;
if ((ali1429_index >= 0xc0 || ali1429_index == 0x20) && cpu_iscyrix)
return 0xff; /*Don't conflict with Cyrix config registers*/
return ali1429_regs[ali1429_index];
}
void ali1429_reset()
{
memset(ali1429_regs, 0xff, 256);
}
void ali1429_init()
{
io_sethandler(0x0022, 0x0002, ali1429_read, NULL, NULL, ali1429_write, NULL, NULL, NULL);
}