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Redefine the value stored within a DMA mapping to be the offset between physical addresses and DMA addresses within the mapped region. Provide a dma() wrapper function to calculate the DMA address for any pointer within a mapped region, thereby simplifying the use cases when a device needs to be given addresses other than the region start address. On a platform using the "flat" DMA implementation the DMA offset for any mapped region is always zero, with the result that dma_map() can be optimised away completely and dma() reduces to a straightforward call to virt_to_phys(). Signed-off-by: Michael Brown <mcb30@ipxe.org>
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README
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org
