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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-01-20 14:01:31 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-01-20 14:01:31 -0300 |
commit | b4b7ff4b08e691656c9d77c758fc355833128ac0 (patch) | |
tree | 82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /include/xen/page.h | |
parent | 35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff) |
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'include/xen/page.h')
-rw-r--r-- | include/xen/page.h | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/include/xen/page.h b/include/xen/page.h index 1daae485e..96294ac93 100644 --- a/include/xen/page.h +++ b/include/xen/page.h @@ -1,11 +1,36 @@ #ifndef _XEN_PAGE_H #define _XEN_PAGE_H +#include <asm/page.h> + +/* 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) << XEN_PAGE_SHIFT) >> 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 <asm/xen/page.h> +/* 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_pfn(page)); + return pfn_to_gfn(page_to_xen_pfn(page)); } struct xen_memory_region { |