#ifndef _XEN_PAGE_H #define _XEN_PAGE_H #include /* The hypercall interface supports only 4KB page */ #define XEN_PAGE_SHIFT 12 #define XEN_PAGE_SIZE (_AC(1, UL) << XEN_PAGE_SHIFT) #define XEN_PAGE_MASK (~(XEN_PAGE_SIZE-1)) #define xen_offset_in_page(p) ((unsigned long)(p) & ~XEN_PAGE_MASK) /* * We assume that PAGE_SIZE is a multiple of XEN_PAGE_SIZE * XXX: Add a BUILD_BUG_ON? */ #define xen_pfn_to_page(xen_pfn) \ (pfn_to_page((unsigned long)(xen_pfn) >> (PAGE_SHIFT - XEN_PAGE_SHIFT))) #define page_to_xen_pfn(page) \ ((page_to_pfn(page)) << (PAGE_SHIFT - XEN_PAGE_SHIFT)) #define XEN_PFN_PER_PAGE (PAGE_SIZE / XEN_PAGE_SIZE) #define XEN_PFN_DOWN(x) ((x) >> XEN_PAGE_SHIFT) #define XEN_PFN_UP(x) (((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT) #define XEN_PFN_PHYS(x) ((phys_addr_t)(x) << XEN_PAGE_SHIFT) #include /* Return the GFN associated to the first 4KB of the page */ static inline unsigned long xen_page_to_gfn(struct page *page) { return pfn_to_gfn(page_to_xen_pfn(page)); } struct xen_memory_region { unsigned long start_pfn; unsigned long n_pfns; }; #define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820MAX */ extern __initdata struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS]; extern unsigned long xen_released_pages; #endif /* _XEN_PAGE_H */ > net-next plumbingsTobias Klauser
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