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ATAPI DMA is now scatter gather-aware.

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This commit is contained in:
OBattler
2017-02-09 01:41:32 +01:00
parent 3d8f054721
commit f5ebf5b7a8
3 changed files with 76 additions and 9 deletions
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58
src/piix.c
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@@ -399,6 +399,46 @@ uint8_t piix_bus_master_read(uint16_t port, void *priv)
return 0xff;
}
int piix_bus_master_get_count(int channel)
{
return piix_busmaster[channel].count;
}
int piix_bus_master_get_eot(int channel)
{
return piix_busmaster[channel].eot;
}
int piix_bus_master_dma_read_ex(int channel, uint8_t *data)
{
int transferred = 0;
if (!(piix_busmaster[channel].status & 1))
return 1; /*DMA disabled*/
mem_invalidate_range(piix_busmaster[channel].addr, piix_busmaster[channel].addr + piix_busmaster[channel].count - 1);
// pclog("Transferring special - %i bytes\n", piix_busmaster[channel].count);
memcpy(&ram[piix_busmaster[channel].addr], data, piix_busmaster[channel].count);
transferred += piix_busmaster[channel].count;
piix_busmaster[channel].addr += piix_busmaster[channel].count;
piix_busmaster[channel].addr %= (mem_size * 1024);
piix_busmaster[channel].count = 0;
if (piix_busmaster[channel].eot) /*End of transfer?*/
{
// pclog("DMA on channel %i - transfer over\n", channel);
piix_busmaster[channel].status &= ~1;
return -1;
}
else
{
// pclog("DMA on channel %i - transfer continuing\n", channel);
piix_bus_master_next_addr(channel);
}
return 0;
}
int piix_bus_master_dma_read(int channel, uint8_t *data, int transfer_length)
{
int transferred = 0;
@@ -408,8 +448,10 @@ int piix_bus_master_dma_read(int channel, uint8_t *data, int transfer_length)
while (transferred < transfer_length)
{
if (piix_busmaster[channel].count < (transfer_length - transferred) && piix_busmaster[channel].eot)
fatal("DMA on channel %i - Read count less than %04X! Addr %08X Count %04X EOT %i\n", channel, transfer_length, piix_busmaster[channel].addr, piix_busmaster[channel].count, piix_busmaster[channel].eot);
if ((piix_busmaster[channel].count < (transfer_length - transferred)) && piix_busmaster[channel].eot && (transfer_length == 512))
{
fatal("DMA on channel %i - Read count less than %04X! Addr %08X Count %04X EOT %i\n", channel, transfer_length, piix_busmaster[channel].addr, piix_busmaster[channel].count, piix_busmaster[channel].eot);
}
mem_invalidate_range(piix_busmaster[channel].addr, piix_busmaster[channel].addr + transfer_length - 1);
@@ -431,14 +473,14 @@ int piix_bus_master_dma_read(int channel, uint8_t *data, int transfer_length)
transferred += (transfer_length - transferred);
}
// pclog("DMA on channel %i - Addr %08X Count %04X EOT %i\n", channel, piix_busmaster[channel].addr, piix_busmaster[channel].count, piix_busmaster[channel].eot);
// pclog("DMA on channel %i - Addr %08X Count %04X EOT %i\n", channel, piix_busmaster[channel].addr, piix_busmaster[channel].count, piix_busmaster[channel].eot);
if (!piix_busmaster[channel].count)
{
// pclog("DMA on channel %i - block over\n", channel);
// pclog("DMA on channel %i - block over\n", channel);
if (piix_busmaster[channel].eot) /*End of transfer?*/
{
// pclog("DMA on channel %i - transfer over\n", channel);
// pclog("DMA on channel %i - transfer over\n", channel);
piix_busmaster[channel].status &= ~1;
}
else
@@ -461,8 +503,10 @@ int piix_bus_master_dma_write(int channel, uint8_t *data, int transfer_length)
while (transferred < transfer_length)
{
if (piix_busmaster[channel].count < (transfer_length - transferred) && piix_busmaster[channel].eot)
fatal("DMA on channel %i - Write count less than %04X! Addr %08X Count %04X EOT %i\n", channel, transfer_length, piix_busmaster[channel].addr, piix_busmaster[channel].count, piix_busmaster[channel].eot);
if ((piix_busmaster[channel].count < (transfer_length - transferred)) && piix_busmaster[channel].eot && (transfer_length == 512))
{
fatal("DMA on channel %i - Write count less than %04X! Addr %08X Count %04X EOT %i\n", channel, transfer_length, piix_busmaster[channel].addr, piix_busmaster[channel].count, piix_busmaster[channel].eot);
}
if (piix_busmaster[channel].count < (transfer_length - transferred))
{