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 get_user_page(vaddr)		__get_free_page(GFP_KERNEL)
 28#define free_user_page(page, addr)	free_page(addr)
 29
 30#define clear_page(page)	memset((page), 0, PAGE_SIZE)
 31#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)
 32
 33#define clear_user_page(page, vaddr, pg)	clear_page(page)
 34#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
 35
 36/*
 37 * These are used to make use of C type-checking..
 38 */
 39typedef struct {
 40	unsigned long pte;
 41} pte_t;
 42typedef struct {
 43	unsigned long pmd[16];
 44} pmd_t;
 45typedef struct {
 46	unsigned long pgd;
 47} pgd_t;
 48typedef struct {
 49	unsigned long pgprot;
 50} pgprot_t;
 51typedef struct page *pgtable_t;
 52
 53#define pte_val(x)	((x).pte)
 54#define pmd_val(x)	((&x)->pmd[0])
 55#define pgd_val(x)	((x).pgd)
 56#define pgprot_val(x)	((x).pgprot)
 57
 58#define __pte(x)	((pte_t) { (x) } )
 59#define __pmd(x)	((pmd_t) { (x) } )
 60#define __pgd(x)	((pgd_t) { (x) } )
 61#define __pgprot(x)	((pgprot_t) { (x) } )
 62
 63extern unsigned long memory_start;
 64extern unsigned long memory_end;
 65
 66#endif /* !__ASSEMBLY__ */
 67
 68#ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS
 69#define PAGE_OFFSET		(CONFIG_KERNEL_RAM_BASE_ADDRESS)
 70#else
 71#define PAGE_OFFSET		(0)
 72#endif
 73
 74#ifndef ARCH_PFN_OFFSET
 75#define ARCH_PFN_OFFSET		(PAGE_OFFSET >> PAGE_SHIFT)
 76#endif
 77
 78#ifndef __ASSEMBLY__
 79
 80#define __va(x) ((void *)((unsigned long) (x)))
 81#define __pa(x) ((unsigned long) (x))
 82
 83#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
 84#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
 85
 86#define virt_to_page(addr)	pfn_to_page(virt_to_pfn(addr))
 87#define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))
 88
 89#ifndef page_to_phys
 90#define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
 91#endif
 92
 93#define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
 94
 95#define	virt_addr_valid(kaddr)	(((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
 96				((void *)(kaddr) < (void *)memory_end))
 97
 98#endif /* __ASSEMBLY__ */
 99
100#include <asm-generic/memory_model.h>
101#include <asm-generic/getorder.h>
102
103#endif /* __ASM_GENERIC_PAGE_H */