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32x, hacks for roms with caching related problems

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This commit is contained in:
kub 2022-12-20 21:32:24 +00:00
parent ebd9c86a6c
commit fe8f2d963e
7 changed files with 89 additions and 28 deletions
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14
pico/32x/memory.c
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@ -816,7 +816,7 @@ static void p32x_sh2reg_write8(u32 a, u32 d, SH2 *sh2)
Pico32x.sh2_regs[0] &= ~0x80;
Pico32x.sh2_regs[0] |= d & 0x80;
if ((d ^ old) & 1)
if ((old ^ d) & 1)
p32x_pwm_schedule_sh2(sh2);
if ((old ^ d) & 2)
p32x_update_cmd_irq(sh2, 0);
@ -1776,7 +1776,7 @@ static void REGPARM(3) sh2_write16_rom(u32 a, u32 d, SH2 *sh2)
// Presumably the write goes to the CPU cache and is read back from there,
// but it would be extremely costly to emulate cache behaviour. Just allow
// writes to that region, hoping that the original ROM values are never used.
if ((a1 & 0x3e0000) == 0x3e0000)
if ((a1 & 0x3e0000) == 0x3e0000 && (PicoIn.quirks & PQUIRK_WWFRAW_HACK))
((u16 *)sh2->p_rom)[a1 / 2] = d;
else
sh2_write16_unmapped(a, d, sh2);
@ -1951,6 +1951,16 @@ void *p32x_sh2_get_mem_ptr(u32 a, u32 *mask, SH2 *sh2)
return ret;
}
int p32x_sh2_mem_is_rom(u32 a, SH2 *sh2)
{
if ((a & 0xc6000000) == 0x02000000) {
// ROM, but mind tweak for WWF Raw
return !(PicoIn.quirks & PQUIRK_WWFRAW_HACK) || (a & 0x3f0000) < 0x3e0000;
}
return 0;
}
int p32x_sh2_memcpy(u32 dst, u32 src, int count, int size, SH2 *sh2)
{
u32 mask;

10
pico/32x/sh2soc.c
View file

@ -137,15 +137,7 @@ static void dmac_memcpy(struct dma_chan *chan, SH2 *sh2)
if (!up || chan->tcr < 4)
return;
#if MARS_CHECK_HACK
// XXX Mars Check Program copies 32K longwords (128KB) from a 64KB buffer in
// ROM or DRAM to SDRAM in 4-longword mode, overwriting an SDRAM comm area in
// turn, which crashes the test on emulators without CPU cache emulation.
// This may be a bug in Mars Check. As a kludge limit the transfer to 64KB,
// which is what the check program test uses for checking the result.
// A better way would clearly be to have a mechanism to patch the ROM...
if (size == 3 && chan->tcr == 32768 && chan->dar == 0x06020000) size = 1;
#endif
if (size == 3) size = 2; // 4-word xfer mode still counts in words
// XXX check TCR being a multiple of 4 in 4-word xfer mode?
// XXX check alignment of sar/dar, generating a bus error if unaligned?