1#ifndef __ASM_GENERIC_PAGE_H
  2#define __ASM_GENERIC_PAGE_H
  3/*
  4 * Generic page.h implementation, for NOMMU architectures.
  5 * This provides the dummy definitions for the memory management.
  6 */
  7
  8#ifdef CONFIG_MMU
  9#error need to prove a real asm/page.h
 10#endif
 11
 12
 13/* PAGE_SHIFT determines the page size */
 14
 15#define PAGE_SHIFT	12
 16#ifdef __ASSEMBLY__
 17#define PAGE_SIZE	(1 << PAGE_SHIFT)
 18#else
 19#define PAGE_SIZE	(1UL << PAGE_SHIFT)
 20#endif
 21#define PAGE_MASK	(~(PAGE_SIZE-1))
 22
 23#include <asm/setup.h>
 24
 25#ifndef __ASSEMBLY__
 26
 27#define clear_page(page)	memset((page), 0, PAGE_SIZE)
 28#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)
 29
 30#define clear_user_page(page, vaddr, pg)	clear_page(page)
 31#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
 32
 33/*
 34 * These are used to make use of C type-checking..
 35 */
 36typedef struct {
 37	unsigned long pte;
 38} pte_t;
 39typedef struct {
 40	unsigned long pmd[16];
 41} pmd_t;
 42typedef struct {
 43	unsigned long pgd;
 44} pgd_t;
 45typedef struct {
 46	unsigned long pgprot;
 47} pgprot_t;
 48typedef struct page *pgtable_t;
 49
 50#define pte_val(x)	((x).pte)
 51#define pmd_val(x)	((&x)->pmd[0])
 52#define pgd_val(x)	((x).pgd)
 53#define pgprot_val(x)	((x).pgprot)
 54
 55#define __pte(x)	((pte_t) { (x) } )
 56#define __pmd(x)	((pmd_t) { (x) } )
 57#define __pgd(x)	((pgd_t) { (x) } )
 58#define __pgprot(x)	((pgprot_t) { (x) } )
 59
 60extern unsigned long memory_start;
 61extern unsigned long memory_end;
 62
 63#endif /* !__ASSEMBLY__ */
 64
 65#ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS
 66#define PAGE_OFFSET		(CONFIG_KERNEL_RAM_BASE_ADDRESS)
 67#else
 68#define PAGE_OFFSET		(0)
 69#endif
 70
 71#ifndef ARCH_PFN_OFFSET
 72#define ARCH_PFN_OFFSET		(PAGE_OFFSET >> PAGE_SHIFT)
 73#endif
 74
 75#ifndef __ASSEMBLY__
 76
 77#define __va(x) ((void *)((unsigned long) (x)))
 78#define __pa(x) ((unsigned long) (x))
 79
 80#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
 81#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
 82
 83#define virt_to_page(addr)	pfn_to_page(virt_to_pfn(addr))
 84#define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))
 85
 86#ifndef page_to_phys
 87#define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
 88#endif
 89
 90#define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
 91
 92#define	virt_addr_valid(kaddr)	(((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
 93				((void *)(kaddr) < (void *)memory_end))
 94
 95#endif /* __ASSEMBLY__ */
 96
 97#include <asm-generic/memory_model.h>
 98#include <asm-generic/getorder.h>
 99
100#endif /* __ASM_GENERIC_PAGE_H */