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Linux/include/xen/page.h

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  1 #ifndef _XEN_PAGE_H
  2 #define _XEN_PAGE_H
  3 
  4 #include <asm/page.h>
  5 
  6 /* The hypercall interface supports only 4KB page */
  7 #define XEN_PAGE_SHIFT  12
  8 #define XEN_PAGE_SIZE   (_AC(1, UL) << XEN_PAGE_SHIFT)
  9 #define XEN_PAGE_MASK   (~(XEN_PAGE_SIZE-1))
 10 #define xen_offset_in_page(p)   ((unsigned long)(p) & ~XEN_PAGE_MASK)
 11 
 12 /*
 13  * We assume that PAGE_SIZE is a multiple of XEN_PAGE_SIZE
 14  * XXX: Add a BUILD_BUG_ON?
 15  */
 16 
 17 #define xen_pfn_to_page(xen_pfn)        \
 18         (pfn_to_page((unsigned long)(xen_pfn) >> (PAGE_SHIFT - XEN_PAGE_SHIFT)))
 19 #define page_to_xen_pfn(page)           \
 20         ((page_to_pfn(page)) << (PAGE_SHIFT - XEN_PAGE_SHIFT))
 21 
 22 #define XEN_PFN_PER_PAGE        (PAGE_SIZE / XEN_PAGE_SIZE)
 23 
 24 #define XEN_PFN_DOWN(x) ((x) >> XEN_PAGE_SHIFT)
 25 #define XEN_PFN_UP(x)   (((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT)
 26 #define XEN_PFN_PHYS(x) ((phys_addr_t)(x) << XEN_PAGE_SHIFT)
 27 
 28 #include <asm/xen/page.h>
 29 
 30 /* Return the GFN associated to the first 4KB of the page */
 31 static inline unsigned long xen_page_to_gfn(struct page *page)
 32 {
 33         return pfn_to_gfn(page_to_xen_pfn(page));
 34 }
 35 
 36 struct xen_memory_region {
 37         unsigned long start_pfn;
 38         unsigned long n_pfns;
 39 };
 40 
 41 #define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820_MAX_ENTRIES_ZEROPAGE */
 42 
 43 extern __initdata
 44 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];
 45 
 46 extern unsigned long xen_released_pages;
 47 
 48 #endif  /* _XEN_PAGE_H */
 49 

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