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Merge pull request #3908 from Cacodemon345/mga-busmastering-fixes

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Matrox Mystique: Make it work under Windows NT 4.0 for real
This commit is contained in:
Miran Grča
2023-12-19 09:17:29 +01:00
committed by GitHub
parent 7f77fd4666 3a5bbe9ad3
commit 3a0e75d6d7
1 changed files with 33 additions and 8 deletions
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41
src/video/vid_mga.c
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@@ -512,6 +512,8 @@ typedef struct mystique_t {
pri_header, sec_header,
iload_header;
atomic_uint words_expected;
mutex_t *lock;
} dma;
@@ -2435,7 +2437,7 @@ mystique_ctrl_write_l(uint32_t addr, uint32_t val, void *priv)
mystique->status &= ~STATUS_ENDPRDMASTS;
mystique->dma.state = DMA_STATE_PRI;
mystique->dma.pri_state = 0;
//mystique->dma.pri_state = 0;
wake_fifo_thread(mystique);
}
thread_release_mutex(mystique->dma.lock);
@@ -2664,18 +2666,29 @@ run_dma(mystique_t *mystique)
case DMA_STATE_PRI:
switch (mystique->dma.primaddress & DMA_MODE_MASK) {
case DMA_MODE_REG:
if (mystique->dma.pri_state == 0) {
if ((mystique->dma.primaddress & DMA_ADDR_MASK) >= (mystique->dma.primend & DMA_ADDR_MASK)) {
mystique->endprdmasts_pending = 1;
mystique->dma.state = DMA_STATE_IDLE;
break;
}
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);
mystique->dma.primaddress += 4;
mystique->dma.words_expected = 4;
words_transferred++;
}
if ((mystique->dma.pri_header & 0xff) != 0x15 && (mystique->dma.primaddress & DMA_ADDR_MASK) < (mystique->dma.primend & 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;
break;
}
{
uint32_t val;
uint32_t reg_addr;
dma_bm_read(mystique->dma.primaddress & DMA_ADDR_MASK, (uint8_t *) &val, 4, 4);
mystique->dma.primaddress += 4;
words_transferred++;
reg_addr = (mystique->dma.pri_header & 0x7f) << 2;
@@ -2690,11 +2703,17 @@ run_dma(mystique_t *mystique)
mystique_accel_ctrl_write_l(reg_addr, val, mystique);
}
if (mystique->dma.words_expected)
mystique->dma.words_expected--;
mystique->dma.primaddress += 4;
mystique->dma.pri_header >>= 8;
mystique->dma.pri_state = (mystique->dma.pri_state + 1) & 3;
if (mystique->dma.state == DMA_STATE_SEC)
mystique->dma.pri_state = 0;
if (mystique->dma.state == DMA_STATE_SEC) {
mystique->dma.pri_state = 0;
mystique->dma.words_expected = 0;
}
else if ((mystique->dma.primaddress & DMA_ADDR_MASK) >= (mystique->dma.primend & DMA_ADDR_MASK)) {
mystique->endprdmasts_pending = 1;
mystique->dma.state = DMA_STATE_IDLE;
@@ -2740,8 +2759,11 @@ run_dma(mystique_t *mystique)
if ((mystique->dma.primaddress & DMA_ADDR_MASK) >= (mystique->dma.primend & DMA_ADDR_MASK)) {
mystique->endprdmasts_pending = 1;
mystique->dma.state = DMA_STATE_IDLE;
} else
} else{
mystique->dma.state = DMA_STATE_PRI;
mystique->dma.words_expected = 0;
mystique->dma.pri_state = 0;
}
}
break;
@@ -2760,8 +2782,11 @@ run_dma(mystique_t *mystique)
if ((mystique->dma.primaddress & DMA_ADDR_MASK) >= (mystique->dma.primend & DMA_ADDR_MASK)) {
mystique->endprdmasts_pending = 1;
mystique->dma.state = DMA_STATE_IDLE;
} else
} else {
mystique->dma.state = DMA_STATE_PRI;
mystique->dma.words_expected = 0;
mystique->dma.pri_state = 0;
}
}
}
break;