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IDE DMA: Properly handle partial transfers, fixes ATAPI DMA in Windows 98 SE.

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OBattler
2025-03-17 20:58:15 +01:00
parent 8fd299f2d7
commit 556c74c159
6 changed files with 30 additions and 19 deletions
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16
src/disk/hdc_ide_sff8038i.c
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@@ -316,14 +316,14 @@ sff_bus_master_readl(uint16_t port, void *priv)
}
int
sff_bus_master_dma(uint8_t *data, int transfer_length, int out, void *priv)
sff_bus_master_dma(uint8_t *data, int transfer_length, int total_length, int out, void *priv)
{
sff8038i_t *dev = (sff8038i_t *) priv;
#ifdef ENABLE_SFF_LOG
char *sop;
#endif
int force_end = 0;
int force_end = 0;
int buffer_pos = 0;
#ifdef ENABLE_SFF_LOG
@@ -365,9 +365,15 @@ sff_bus_master_dma(uint8_t *data, int transfer_length, int out, void *priv)
return 1; /* This block has exhausted the data to transfer and it was smaller than the count, break. */
} else {
if (!transfer_length && !dev->eot) {
sff_log("Total transfer length smaller than sum of all blocks, full block\n");
dev->status &= ~2;
return 1; /* We have exhausted the data to transfer but there's more blocks left, break. */
if (total_length) {
sff_log("Total transfer length smaller than sum of all blocks, partial transfer\n");
sff_bus_master_next_addr(dev);
return 1; /* We have exhausted the data to transfer but there's more blocks left, break. */
} else {
sff_log("Total transfer length smaller than sum of all blocks, full block\n");
dev->status &= ~2;
return 1; /* We have exhausted the data to transfer but there's more blocks left, break. */
}
} else if (transfer_length && dev->eot) {
sff_log("Total transfer length greater than sum of all blocks\n");
dev->status |= 2;