[deliverable/linux.git] / include / xen / page.h

#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) >> (PAGE_SHIFT - XEN_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_xen_pfn(page));
}

struct xen_memory_region {
	unsigned long start_pfn;
	unsigned long n_pfns;
};

#define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820MAX */

extern __initdata
struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];

extern unsigned long xen_released_pages;

#endif	/* _XEN_PAGE_H */
Commit	Line	Data
	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 /* == E820MAX */
	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 */