ata: Implement DMA transfers#192
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The implementation of push_data should be its own commit.
Other than that, this looks good.
Implement push_data in AtaBaseDevice using the device transfer buffer and post-transfer callback. Advance the read data pointer across DMA pulls so a transfer can span multiple DBDMA descriptors, and clear the DMA state when transfers finish.
Add read/write DMA command support to ATA hard disks (can mostly reuse the PIO paths).
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Also includes the fix from dingusdev/dingusppc#192 which allows the Mac OS X public beta to boot. For #219
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Add read/write DMA support to ATA devices (mostly reusing existing PIO read and write paths).
We also need to advance
data_ptracross DMA pulls so transfers can span multiple DBDMA descriptors.Fixes #154