root/arch/x86/include/asm/xen/page-coherent.h

DEFINITIONS

1. xen_alloc_coherent_pages
2. xen_free_coherent_pages
3. xen_dma_map_page
4. xen_dma_unmap_page
5. xen_dma_sync_single_for_cpu
6. xen_dma_sync_single_for_device

#ifndef _ASM_X86_XEN_PAGE_COHERENT_H
#define _ASM_X86_XEN_PAGE_COHERENT_H

#include <asm/page.h>
#include <linux/dma-attrs.h>
#include <linux/dma-mapping.h>

static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
                dma_addr_t *dma_handle, gfp_t flags,
                struct dma_attrs *attrs)
{
        void *vstart = (void*)__get_free_pages(flags, get_order(size));
        *dma_handle = virt_to_phys(vstart);
        return vstart;
}

static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
                void *cpu_addr, dma_addr_t dma_handle,
                struct dma_attrs *attrs)
{
        free_pages((unsigned long) cpu_addr, get_order(size));
}

static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
             unsigned long offset, size_t size, enum dma_data_direction dir,
             struct dma_attrs *attrs) { }

static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
                size_t size, enum dma_data_direction dir,
                struct dma_attrs *attrs) { }

static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
                dma_addr_t handle, size_t size, enum dma_data_direction dir) { }

static inline void xen_dma_sync_single_for_device(struct device *hwdev,
                dma_addr_t handle, size_t size, enum dma_data_direction dir) { }

#endif /* _ASM_X86_XEN_PAGE_COHERENT_H */