1#ifndef _XEN_PAGE_H
2#define _XEN_PAGE_H
3
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4#include <asm/xen/page.h>
5
6extern phys_addr_t xen_extra_mem_start, xen_extra_mem_size;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
7
8#endif	/* _XEN_PAGE_H */

 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 /* == E820MAX */
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 */