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