include/asm-sh/page.h

   1 #ifndef __ASM_SH_PAGE_H
   2 #define __ASM_SH_PAGE_H
   3
   4 /*
   5  * Copyright (C) 1999  Niibe Yutaka
   6  */
   7
   8 /*
   9    [ P0/U0 (virtual) ]          0x00000000     <------ User space
  10    [ P1 (fixed)   cached ]      0x80000000     <------ Kernel space
  11    [ P2 (fixed)  non-cachable]  0xA0000000     <------ Physical access
  12    [ P3 (virtual) cached]       0xC0000000     <------ vmalloced area
  13    [ P4 control   ]             0xE0000000
  14  */
  15
  16 #include <linux/config.h>
  17
  18 /* PAGE_SHIFT determines the page size */
  19 #define PAGE_SHIFT      12
  20 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  21 #define PAGE_MASK       (~(PAGE_SIZE-1))
  22 #define PTE_MASK        PAGE_MASK
  23
  24 #ifdef __KERNEL__
  25 #ifndef __ASSEMBLY__
  26
  27 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  28 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  29
  30 #if defined(__sh3__)
  31 #define clear_user_page(page, vaddr)    clear_page(page)
  32 #define copy_user_page(to, from, vaddr) copy_page(to, from)
  33 #elif defined(__SH4__)
  34 extern void clear_user_page(void *to, unsigned long address);
  35 extern void copy_user_page(void *to, void *from, unsigned long address);
  36 #endif
  37
  38 /*
  39  * These are used to make use of C type-checking..
  40  */
  41 typedef struct { unsigned long pte; } pte_t;
  42 typedef struct { unsigned long pmd; } pmd_t;
  43 typedef struct { unsigned long pgd; } pgd_t;
  44 typedef struct { unsigned long pgprot; } pgprot_t;
  45
  46 #define pte_val(x)      ((x).pte)
  47 #define pmd_val(x)      ((x).pmd)
  48 #define pgd_val(x)      ((x).pgd)
  49 #define pgprot_val(x)   ((x).pgprot)
  50
  51 #define __pte(x) ((pte_t) { (x) } )
  52 #define __pmd(x) ((pmd_t) { (x) } )
  53 #define __pgd(x) ((pgd_t) { (x) } )
  54 #define __pgprot(x)     ((pgprot_t) { (x) } )
  55
  56 #endif /* !__ASSEMBLY__ */
  57
  58 /* to align the pointer to the (next) page boundary */
  59 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  60
  61 /*
  62  * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
  63  *
  64  *      arch/sh/vmlinux.lds.S
  65  *
  66  * which has the same constant encoded..
  67  */
  68
  69 #define __MEMORY_START          CONFIG_MEMORY_START
  70
  71 #define PAGE_OFFSET             (0x80000000UL)
  72 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
  73 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
  74 #define virt_to_page(kaddr)     (mem_map + ((__pa(kaddr)-__MEMORY_START) >> PAGE_SHIFT))
  75 #define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)
  76
  77 #ifndef __ASSEMBLY__
  78
  79 /*
  80  * Tell the user there is some problem.
  81  */
  82 #define BUG() do { \
  83         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
  84         asm volatile("nop"); \
  85 } while (0)
  86
  87 #define PAGE_BUG(page) do { \
  88         BUG(); \
  89 } while (0)
  90
  91 /* Pure 2^n version of get_order */
  92 extern __inline__ int get_order(unsigned long size)
  93 {
  94         int order;
  95
  96         size = (size-1) >> (PAGE_SHIFT-1);
  97         order = -1;
  98         do {
  99                 size >>= 1;
 100                 order++;
 101         } while (size);
 102         return order;
 103 }
 104
 105 #endif
 106
 107 #endif /* __KERNEL__ */
 108
 109 #endif /* __ASM_SH_PAGE_H */