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@@ -0,0 +1,64 @@
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+#include <linux/bootmem.h>
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+#include <linux/gfp.h>
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+#include <linux/export.h>
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+#include <linux/slab.h>
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+#include <linux/types.h>
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+#include <linux/dma-mapping.h>
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+#include <linux/vmalloc.h>
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+#include <linux/swiotlb.h>
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+
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+#include <xen/xen.h>
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+#include <xen/interface/memory.h>
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+#include <xen/swiotlb-xen.h>
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+
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+#include <asm/cacheflush.h>
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+#include <asm/xen/page.h>
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+#include <asm/xen/hypercall.h>
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+#include <asm/xen/interface.h>
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+
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+int xen_create_contiguous_region(unsigned long vstart, unsigned int order,
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+ unsigned int address_bits,
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+ dma_addr_t *dma_handle)
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+{
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+ if (!xen_initial_domain())
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+ return -EINVAL;
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+
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+ /* we assume that dom0 is mapped 1:1 for now */
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+ *dma_handle = virt_to_phys(pstart);
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
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+
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+void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order)
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+{
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+ return;
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+}
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+EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
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+
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+struct dma_map_ops *xen_dma_ops;
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+EXPORT_SYMBOL_GPL(xen_dma_ops);
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+
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+static struct dma_map_ops xen_swiotlb_dma_ops = {
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+ .mapping_error = xen_swiotlb_dma_mapping_error,
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+ .alloc = xen_swiotlb_alloc_coherent,
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+ .free = xen_swiotlb_free_coherent,
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+ .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
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+ .sync_single_for_device = xen_swiotlb_sync_single_for_device,
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+ .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
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+ .sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
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+ .map_sg = xen_swiotlb_map_sg_attrs,
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+ .unmap_sg = xen_swiotlb_unmap_sg_attrs,
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+ .map_page = xen_swiotlb_map_page,
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+ .unmap_page = xen_swiotlb_unmap_page,
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+ .dma_supported = xen_swiotlb_dma_supported,
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+};
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+
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+int __init xen_mm_init(void)
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+{
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+ if (!xen_initial_domain())
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+ return 0;
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+ xen_swiotlb_init(1, false);
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+ xen_dma_ops = &xen_swiotlb_dma_ops;
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+ return 0;
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+}
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+arch_initcall(xen_mm_init);
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