#ifndef _LINUX_PAGE_H#define _LINUX_PAGE_H			/* PAGE_SHIFT determines the page size */#define PAGE_SHIFT			12#define PAGE_SIZE			((unsigned long)1<<PAGE_SHIFT)#ifdef __KERNEL__			/* number of bits that fit into a memory pointer */#define BITS_PER_PTR			(8*sizeof(unsigned long))			/* to mask away the intra-page address bits */#define PAGE_MASK			(~(PAGE_SIZE-1))			/* to align the pointer to the (next) page boundary */#define PAGE_ALIGN(addr)		(((addr)+PAGE_SIZE-1)&PAGE_MASK)			/* to align the pointer to a pointer address */#define PTR_MASK			(~(sizeof(void*)-1))					/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */					/* 64-bit machines, beware!  SRB. */#define SIZEOF_PTR_LOG2			2			/* to find an entry in a page-table-directory */#define PAGE_DIR_OFFSET(base,address)	((unsigned long*)((base)+\  ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)*2&PTR_MASK&~PAGE_MASK)))			/* to find an entry in a page-table */#define PAGE_PTR(address)		\  ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)			/* the no. of pointers that fit on a page */#define PTRS_PER_PAGE			(PAGE_SIZE/sizeof(void*))#endif /* __KERNEL__ */#endif /* _LINUX_PAGE_H */