1#ifndef _ASM_X86_XEN_PAGE_COHERENT_H
 2#define _ASM_X86_XEN_PAGE_COHERENT_H
 3
 4#include <asm/page.h>
 5#include <linux/dma-mapping.h>
 6
 7static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
 8		dma_addr_t *dma_handle, gfp_t flags,
 9		unsigned long attrs)
10{
11	void *vstart = (void*)__get_free_pages(flags, get_order(size));
12	*dma_handle = virt_to_phys(vstart);
13	return vstart;
14}
15
16static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
17		void *cpu_addr, dma_addr_t dma_handle,
18		unsigned long attrs)
19{
20	free_pages((unsigned long) cpu_addr, get_order(size));
21}
22
23static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
24	     dma_addr_t dev_addr, unsigned long offset, size_t size,
25	     enum dma_data_direction dir, unsigned long attrs) { }
26
27static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
28		size_t size, enum dma_data_direction dir,
29		unsigned long attrs) { }
30
31static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
32		dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
33
34static inline void xen_dma_sync_single_for_device(struct device *hwdev,
35		dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
36
37#endif /* _ASM_X86_XEN_PAGE_COHERENT_H */