#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, }; #endif