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SiS 471: Fix RAM bank values (and some other minor things), fixes #5534.

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OBattler
2025-05-02 02:17:09 +02:00
parent 5e85f4533a
commit 7885c28ea2
1 changed files with 29 additions and 6 deletions
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35
src/chipset/sis_85c4xx.c
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@@ -33,6 +33,7 @@
#include <86box/mem.h>
#include <86box/smram.h>
#include <86box/pic.h>
#include <86box/keyboard.h>
#include <86box/machine.h>
#include <86box/chipset.h>
@@ -79,8 +80,8 @@ static uint8_t ram_471[64] = { 0x00, 0x00, 0x01, 0x01, 0x02, 0x20, 0x09, 0x09,
0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e,
0x1b, 0x1b, 0x1b, 0x1b, 0x0f, 0x0f, 0x0f, 0x0f,
0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17,
0x1e, 0x1e, 0x1e, 0x1e, 0x1e, 0x1e, 0x1e, 0x1e,
0x1e, 0x1e, 0x1e, 0x1e, 0x1e, 0x1e, 0x1e, 0x1e };
0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d,
0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d };
static uint8_t ram_tg486g[64] = { 0x10, 0x10, 0x10, 0x10, 0x10, 0x11, 0x11, 0x11,
0x11, 0x12, 0x12, 0x12, 0x12, 0x13, 0x13, 0x13,
0x13, 0x14, 0x14, 0x14, 0x14, 0x15, 0x15, 0x15,
@@ -544,12 +545,23 @@ sis_85c4xx_out(uint16_t port, uint8_t val, void *priv)
case 0x23:
if ((dev->cur_reg >= dev->reg_base) && (dev->cur_reg <= dev->reg_last)) {
valxor = val ^ dev->regs[rel_reg];
if (rel_reg == 0x00)
if (!dev->is_471 && (rel_reg == 0x00))
dev->regs[rel_reg] = (dev->regs[rel_reg] & 0x1f) | (val & 0xe0);
else
dev->regs[rel_reg] = val;
switch (rel_reg) {
case 0x00:
if (val & 0x01) {
kbc_at_set_fast_reset(0);
cpu_cpurst_on_sr = 1;
} else {
kbc_at_set_fast_reset(1);
cpu_cpurst_on_sr = 0;
}
break;
case 0x01:
cpu_cache_ext_enabled = ((val & 0x84) == 0x84);
cpu_update_waitstates();
@@ -560,6 +572,8 @@ sis_85c4xx_out(uint16_t port, uint8_t val, void *priv)
case 0x08:
if (valxor)
sis_85c4xx_recalcmapping(dev);
if (rel_reg == 0x08)
flushmmucache();
break;
case 0x09:
@@ -681,10 +695,16 @@ sis_85c4xx_reset(void *priv)
if (dev->is_471) {
dev->regs[0x09] = 0x40;
if (mem_size_mb >= 64) {
if ((mem_size_mb >= 65) && (mem_size_mb < 68))
dev->regs[0x09] |= 0x22;
if ((mem_size_mb >= 64) && (mem_size_mb < 68))
dev->regs[0x09] |= 0x33;
if ((mem_size_mb >= 68) && (mem_size_mb < 72))
dev->regs[0x09] |= 0x2b;
if ((mem_size_mb >= 72) && (mem_size_mb < 80))
dev->regs[0x09] |= 0x2d;
if ((mem_size_mb >= 80) && (mem_size_mb < 96))
dev->regs[0x09] |= 0x2f;
else
dev->regs[0x09] |= 0x24;
dev->regs[0x09] |= 0x29;
} else if (!strcmp(machine_get_internal_name(), "tg486g"))
dev->regs[0x09] |= ram_tg486g[mem_size_mb];
else
@@ -718,6 +738,9 @@ sis_85c4xx_reset(void *priv)
soft_reset_mask = 0;
sis_85c471_banks_recalc(dev);
kbc_at_set_fast_reset(1);
cpu_cpurst_on_sr = 0;
} else {
/* Bits 6 and 7 must be clear on the SiS 40x. */
if (dev->reg_base == 0x60)