add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/include/xen/swiotlb-xen.h
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@@ -4,6 +4,11 @@
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 #include <linux/swiotlb.h>
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+void xen_dma_sync_for_cpu(struct device *dev, dma_addr_t handle,
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+			  size_t size, enum dma_data_direction dir);
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+void xen_dma_sync_for_device(struct device *dev, dma_addr_t handle,
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+			     size_t size, enum dma_data_direction dir);
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+
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 extern int xen_swiotlb_init(int verbose, bool early);
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 extern const struct dma_map_ops xen_swiotlb_dma_ops;
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