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Mystique: SOFTRAP register writes correctly reset the primary DMA channel

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This commit is contained in:
Cacodemon345
2023-12-20 01:30:09 +06:00
parent 7495c2537b
commit 1773ebfbf3
1 changed files with 21 additions and 3 deletions
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24
src/video/vid_mga.c
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@@ -2685,6 +2685,7 @@ run_dma(mystique_t *mystique)
}
if (mystique->dma.pri_state == 0 && !mystique->dma.words_expected) {
dma_bm_read(mystique->dma.primaddress & DMA_ADDR_MASK, (uint8_t *) &mystique->dma.pri_header, 4, 4);
//pclog("DMA header: 0x%08X\n", mystique->dma.pri_header);
mystique->dma.primaddress += 4;
mystique->dma.words_expected = 4;
words_transferred++;
@@ -2712,7 +2713,12 @@ run_dma(mystique_t *mystique)
if ((reg_addr & 0x300) == 0x100)
mystique->blitter_submit_dma_refcount++;
//pclog("DMA value: 0x%08X to reg 0x%04X\n", val, reg_addr);
mystique_accel_ctrl_write_l(reg_addr, val, mystique);
if (reg_addr == REG_SOFTRAP) {
mystique->dma.primaddress += 4;
break;
}
}
if (mystique->dma.words_expected)
@@ -2723,8 +2729,6 @@ run_dma(mystique_t *mystique)
mystique->dma.pri_state = (mystique->dma.pri_state + 1) & 3;
if (mystique->dma.state == DMA_STATE_SEC) {
mystique->dma.pri_state = 0;
mystique->dma.words_expected = 0;
mystique->dma.sec_state = 0;
}
else if ((mystique->dma.primaddress & DMA_ADDR_MASK) >= (mystique->dma.primend & DMA_ADDR_MASK)) {
@@ -2756,9 +2760,23 @@ run_dma(mystique_t *mystique)
if (mystique->dma.sec_state == 0) {
dma_bm_read(mystique->dma.secaddress & DMA_ADDR_MASK, (uint8_t *) &mystique->dma.sec_header, 4, 4);
mystique->dma.secaddress += 4;
//pclog("DMA header (secondary): 0x%08X\n", mystique->dma.sec_header);
words_transferred++;
}
if ((mystique->dma.secaddress & DMA_ADDR_MASK) >= (mystique->dma.secend & DMA_ADDR_MASK)) {
if ((mystique->dma.primaddress & DMA_ADDR_MASK) >= (mystique->dma.primend & DMA_ADDR_MASK)) {
mystique->endprdmasts_pending = 1;
mystique->dma.state = DMA_STATE_IDLE;
mystique->dma.pri_state = 0;
mystique->dma.words_expected = 0;
} else {
mystique->dma.state = DMA_STATE_PRI;
mystique->dma.words_expected = 0;
mystique->dma.pri_state = 0;
}
}
uint32_t val;
uint32_t reg_addr;
@@ -2775,7 +2793,7 @@ run_dma(mystique_t *mystique)
mystique->blitter_submit_dma_refcount++;
mystique_accel_ctrl_write_l(reg_addr, val, mystique);
//pclog("DMA value (secondary): 0x%08X\n", val);
mystique->dma.sec_header >>= 8;
mystique->dma.sec_state = (mystique->dma.sec_state + 1) & 3;