linux/include/asm-generic/page.h
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   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 */
 104
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