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 */ 31static inline unsigned long xen_page_to_gfn(struct page *page) 32{ 33 return pfn_to_gfn(page_to_xen_pfn(page)); 34} 35 36struct 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 43extern __initdata 44struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS]; 45 46extern unsigned long xen_released_pages; 47 48#endif /* _XEN_PAGE_H */ 49