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sh4 dmac: more accurate implementation. Fixes sh4_dmac_demo.elf

This commit is contained in:
Flyinghead 2023-03-07 18:38:41 +01:00
parent abcd9d77d4
commit b8d47fe0a8
1 changed files with 87 additions and 19 deletions
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106
core/hw/sh4/modules/dmac.cpp
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@ -118,29 +118,97 @@ static void WriteCHCR(u32 addr, u32 data)
DMAC_CHCR(ch).full = data & 0xff0afff7;
if (DMAC_CHCR(ch).TE == 0 && DMAC_CHCR(ch).DE && DMAC_DMAOR.DME)
{
{
if (DMAC_CHCR(ch).RS == 4)
{
u32 len = DMAC_DMATCR(ch) * 32;
{
DEBUG_LOG(SH4, "DMAC: Manual DMA ch:%d TS:%d src: %08X dst: %08X len: %08X SM: %d, DM: %d", ch, DMAC_CHCR(ch).TS,
DMAC_SAR(ch), DMAC_DAR(ch), DMAC_DMATCR(ch), DMAC_CHCR(ch).SM, DMAC_CHCR(ch).DM);
u32 src = DMAC_SAR(ch);
u32 len = DMAC_DMATCR(ch);
u32 dst = DMAC_DAR(ch);
DEBUG_LOG(SH4, "DMAC: Manual DMA ch:%d TS:%d src: %08X dst: %08X len: %08X SM: %d, DM: %d", ch, DMAC_CHCR(ch).TS,
DMAC_SAR(ch), DMAC_DAR(ch), DMAC_DMATCR(ch), DMAC_CHCR(ch).SM, DMAC_CHCR(ch).DM);
verify(DMAC_CHCR(ch).TS == 4);
for (u32 ofs = 0; ofs < len; ofs += 4)
{
u32 data = ReadMem32_nommu(DMAC_SAR(ch) + ofs);
WriteMem32_nommu(DMAC_DAR(ch) + ofs, data);
int srcIncr, dstIncr;
switch (DMAC_CHCR(ch).SM)
{
case 1:
srcIncr = 1;
break;
case 2:
srcIncr = -1;
break;
default:
srcIncr = 0;
break;
}
switch (DMAC_CHCR(ch).DM)
{
case 1:
dstIncr = 1;
break;
case 2:
dstIncr = -1;
break;
default:
dstIncr = 0;
break;
}
switch (DMAC_CHCR(ch).TS)
{
case 0: // 64 bits
srcIncr *= sizeof(u64);
dstIncr *= sizeof(u64);
for (; len != 0; len--)
{
u64 data = addrspace::read64(src);
addrspace::write64(dst, data);
src += srcIncr;
dst += dstIncr;
}
break;
case 1: // 8 bits
for (; len != 0; len--)
{
u8 data = addrspace::read8(src);
addrspace::write8(dst, data);
src += srcIncr;
dst += dstIncr;
}
break;
case 2: // 16 bits
srcIncr *= sizeof(u16);
dstIncr *= sizeof(u16);
for (; len != 0; len--)
{
u16 data = addrspace::read16(src);
addrspace::write16(dst, data);
src += srcIncr;
dst += dstIncr;
}
break;
case 4: // 32-byte block
len *= 32 / sizeof(u32);
[[fallthrough]];
default: // 32 bits
srcIncr *= sizeof(u32);
dstIncr *= sizeof(u32);
for (; len != 0; len--)
{
u32 data = addrspace::read32(src);
addrspace::write32(dst, data);
src += srcIncr;
dst += dstIncr;
}
break;
}
DMAC_CHCR(ch).TE = 1;
if (DMAC_CHCR(ch).SM == 1)
DMAC_SAR(ch) += len;
else if (DMAC_CHCR(ch).SM == 2)
DMAC_SAR(ch) -= len;
if (DMAC_CHCR(ch).DM == 1)
DMAC_DAR(ch) += len;
else if (DMAC_CHCR(ch).DM == 2)
DMAC_DAR(ch) -= len;
DMAC_SAR(ch) = src;
DMAC_DAR(ch) = dst;
DMAC_DMATCR(ch) = len;
}
InterruptPend(dmac_itr[ch], DMAC_CHCR(ch).TE);