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DMA ATA commands support

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-12-25 02:53:20 +01:00
parent 908a8fc37a
commit 51f7e1acb7
4 changed files with 33 additions and 5 deletions
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28
grub-core/disk/ata.c
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@ -255,8 +255,16 @@ grub_ata_readwrite (grub_disk_t disk, grub_disk_addr_t sector,
if (addressing == GRUB_ATA_LBA48 && ((sector + size) >> 28) != 0)
{
batch = 65536;
cmd = GRUB_ATA_CMD_READ_SECTORS_EXT;
cmd_write = GRUB_ATA_CMD_WRITE_SECTORS_EXT;
if (ata->dma)
{
cmd = GRUB_ATA_CMD_READ_SECTORS_DMA_EXT;
cmd_write = GRUB_ATA_CMD_WRITE_SECTORS_DMA_EXT;
}
else
{
cmd = GRUB_ATA_CMD_READ_SECTORS_EXT;
cmd_write = GRUB_ATA_CMD_WRITE_SECTORS_EXT;
}
}
else
{
@ -266,9 +274,17 @@ grub_ata_readwrite (grub_disk_t disk, grub_disk_addr_t sector,
batch = 256;
else
batch = 1;
cmd = GRUB_ATA_CMD_READ_SECTORS;
cmd_write = GRUB_ATA_CMD_WRITE_SECTORS;
}
if (ata->dma)
{
cmd = GRUB_ATA_CMD_READ_SECTORS_DMA;
cmd_write = GRUB_ATA_CMD_WRITE_SECTORS_DMA;
}
else
{
cmd = GRUB_ATA_CMD_READ_SECTORS;
cmd_write = GRUB_ATA_CMD_WRITE_SECTORS;
}
}
grub_size_t nsectors = 0;
while (nsectors < size)
@ -285,6 +301,8 @@ grub_ata_readwrite (grub_disk_t disk, grub_disk_addr_t sector,
parms.taskfile.cmd = (! rw ? cmd : cmd_write);
parms.buffer = buf;
parms.size = batch * GRUB_DISK_SECTOR_SIZE;
if (ata->dma)
parms.dma = 1;
err = ata->dev->readwrite (ata, &parms);
if (err)