include/asm-generic/page.h

   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  */
  39 typedef struct {
  40         unsigned long pte;
  41 } pte_t;
  42 typedef struct {
  43         unsigned long pmd[16];
  44 } pmd_t;
  45 typedef struct {
  46         unsigned long pgd;
  47 } pgd_t;
  48 typedef struct {
  49         unsigned long pgprot;
  50 } pgprot_t;
  51 typedef 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
  63 extern unsigned long memory_start;
  64 extern 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 __ASSEMBLY__
  75
  76 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
  77 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
  78
  79 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  80 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  81
  82 #define virt_to_page(addr)      pfn_to_page(virt_to_pfn(addr))
  83 #define page_to_virt(page)      pfn_to_virt(page_to_pfn(page))
  84
  85 #ifndef page_to_phys
  86 #define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
  87 #endif
  88
  89 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  90
  91 #define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
  92                                 ((void *)(kaddr) < (void *)memory_end))
  93
  94 #endif /* __ASSEMBLY__ */
  95
  96 #include <asm-generic/memory_model.h>
  97 #include <asm-generic/getorder.h>
  98
  99 #endif /* __ASM_GENERIC_PAGE_H */