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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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