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#ifndef _LINUX_DMA_MAPPING_H
#define _LINUX_DMA_MAPPING_H
#ifdef CONFIG_HAS_DMA
# error Virtio userspace code does not support CONFIG_HAS_DMA
#endif
#define PCI_DMA_BUS_IS_PHYS 1
enum dma_data_direction {
DMA_BIDIRECTIONAL = 0,
DMA_TO_DEVICE = 1,
DMA_FROM_DEVICE = 2,
DMA_NONE = 3,
};
#define dma_alloc_coherent(d, s, hp, f) ({ \
void *__dma_alloc_coherent_p = kmalloc((s), (f)); \
*(hp) = (unsigned long)__dma_alloc_coherent_p; \
__dma_alloc_coherent_p; \
})
#define dma_free_coherent(d, s, p, h) kfree(p)
#define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o))
#define dma_map_single(d, p, s, dir) (virt_to_phys(p))
#define dma_mapping_error(...) (0)
#define dma_unmap_single(...) do { } while (0)
#define dma_unmap_page(...) do { } while (0)
#endif
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