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Moved the two (unused) Intel 386 chipset files to chipset/.

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This commit is contained in:
OBattler
2020-06-13 10:27:07 +02:00
parent 9c6f0d806e
commit ebe07c7e82
2 changed files with 0 additions and 0 deletions
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137
src/chipset/i82335.c Normal file
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/* Intel 82335 SX emulation, used by the Phoenix 386 clone. */
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <wchar.h>
#include <86box/io.h>
#include <86box/mem.h>
typedef struct
{
uint8_t reg_22;
uint8_t reg_23;
} i82335_t;
i82335_t i82335;
uint8_t i82335_read(uint16_t addr, void *priv);
void i82335_write(uint16_t addr, uint8_t val, void *priv)
{
int i = 0;
int mem_write = 0;
// pclog("i82335_write(%04X, %02X)\n", addr, val);
switch (addr)
{
case 0x22:
if ((val ^ i82335.reg_22) & 1)
{
if (val & 1)
{
for (i = 0; i < 8; i++)
{
mem_set_mem_state(0xe0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
shadowbios = 1;
}
}
else
{
for (i = 0; i < 8; i++)
{
mem_set_mem_state(0xe0000, 0x20000, MEM_READ_EXTANY | MEM_WRITE_EXTANY);
shadowbios = 0;
}
}
flushmmucache();
}
i82335.reg_22 = val | 0xd8;
break;
case 0x23:
i82335.reg_23 = val;
if ((val ^ i82335.reg_22) & 2)
{
if (val & 2)
{
for (i = 0; i < 8; i++)
{
mem_set_mem_state(0xc0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
shadowbios = 1;
}
}
else
{
for (i = 0; i < 8; i++)
{
mem_set_mem_state(0xc0000, 0x20000, MEM_READ_EXTANY | MEM_WRITE_EXTANY);
shadowbios = 0;
}
}
}
if ((val ^ i82335.reg_22) & 0xc)
{
if (val & 2)
{
for (i = 0; i < 8; i++)
{
mem_write = (val & 8) ? MEM_WRITE_DISABLED : MEM_WRITE_INTERNAL;
mem_set_mem_state(0xa0000, 0x20000, MEM_READ_INTERNAL | mem_write);
shadowbios = 1;
}
}
else
{
for (i = 0; i < 8; i++)
{
mem_write = (val & 8) ? MEM_WRITE_DISABLED : MEM_WRITE_EXTANY;
mem_set_mem_state(0xa0000, 0x20000, MEM_READ_EXTANY | mem_write);
shadowbios = 0;
}
}
}
if ((val ^ i82335.reg_22) & 0xe)
{
flushmmucache();
}
if (val & 0x80)
{
io_removehandler(0x0022, 0x0001, i82335_read, NULL, NULL, i82335_write, NULL, NULL, NULL);
}
break;
}
}
uint8_t i82335_read(uint16_t addr, void *priv)
{
// pclog("i82335_read(%04X)\n", addr);
if (addr == 0x22)
{
return i82335.reg_22;
}
else if (addr == 0x23)
{
return i82335.reg_23;
}
else
{
return 0;
}
}
void i82335_init()
{
memset(&i82335, 0, sizeof(i82335_t));
i82335.reg_22 = 0xd8;
io_sethandler(0x0022, 0x0014, i82335_read, NULL, NULL, i82335_write, NULL, NULL, NULL);
}

38
src/chipset/mcr.c Normal file
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@@ -0,0 +1,38 @@
/*INTEL 82355 MCR emulation
This chip was used as part of many 386 chipsets
It controls memory addressing and shadowing*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <wchar.h>
#include <86box/86box.h>
#include <86box/mem.h>
int nextreg6;
uint8_t mcr22;
int mcrlock,mcrfirst;
void resetmcr(void)
{
mcrlock=0;
mcrfirst=1;
shadowbios=0;
}
void writemcr(uint16_t addr, uint8_t val)
{
switch (addr)
{
case 0x22:
if (val==6 && mcr22==6) nextreg6=1;
else nextreg6=0;
break;
case 0x23:
if (nextreg6) shadowbios=!val;
break;
}
mcr22=val;
}