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Implemented preliminary S3 ViRGE 2D blitter emulation.

Browse source 
Misc ViRGE fixes.
Changes to memory mapping.
Changes to PCI handling.
Disabled 'AMI WinBIOS 486 PCI' due to incomplete chipset emulation.
Invalid GUS register reads no longer kill the emulator.
This commit is contained in:
TomW 2014-03-20 14:03:55 +00:00
commit 2ca4ead570
49 changed files with 2078 additions and 700 deletions
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62
src/ali1429.c
View file

@ -9,9 +9,42 @@
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)
{
// return;
int c;
if (!(port & 1))
ali1429_index = val;
else
@ -21,35 +54,12 @@ void ali1429_write(uint16_t port, uint8_t val, void *priv)
switch (ali1429_index)
{
case 0x13:
if (!(val & 0xc0))
{
shadowbios = 0;
if (!shadowbios_write)
mem_bios_set_state(0xf0000, 0x10000, 0, 0);
else
mem_bios_set_state(0xf0000, 0x10000, 0, 1);
flushmmucache();
}
ali1429_recalc();
break;
case 0x14:
shadowbios = val & 1;
shadowbios_write = val & 2;
switch (val & 3)
{
case 0:
mem_bios_set_state(0xf0000, 0x10000, 0, 0);
break;
case 1:
mem_bios_set_state(0xf0000, 0x10000, 1, 0);
break;
case 2:
mem_bios_set_state(0xf0000, 0x10000, 0, 1);
break;
case 3:
mem_bios_set_state(0xf0000, 0x10000, 1, 1);
break;
}
flushmmucache();
ali1429_recalc();
break;
}
}