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 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  25 #define HPAGE_SHIFT     16
  26 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  27 #define HPAGE_SHIFT     20
  28 #endif
  29
  30 #ifdef CONFIG_HUGETLB_PAGE
  31 #define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  32 #define HPAGE_MASK              (~(HPAGE_SIZE-1))
  33 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  34 #endif
  35
  36 #ifdef __KERNEL__
  37 #ifndef __ASSEMBLY__
  38
  39 extern void (*clear_page)(void *to);
  40 extern void (*copy_page)(void *to, void *from);
  41
  42 extern void clear_page_slow(void *to);
  43 extern void copy_page_slow(void *to, void *from);
  44
  45 #if defined(CONFIG_SH7705_CACHE_32KB) && defined(CONFIG_MMU)
  46 struct page;
  47 extern void clear_user_page(void *to, unsigned long address, struct page *pg);
  48 extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
  49 extern void __clear_user_page(void *to, void *orig_to);
  50 extern void __copy_user_page(void *to, void *from, void *orig_to);
  51 #elif defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH3) || !defined(CONFIG_MMU)
  52 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  53 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  54 #elif defined(CONFIG_CPU_SH4)
  55 struct page;
  56 extern void clear_user_page(void *to, unsigned long address, struct page *pg);
  57 extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
  58 extern void __clear_user_page(void *to, void *orig_to);
  59 extern void __copy_user_page(void *to, void *from, void *orig_to);
  60 #endif
  61
  62 /*
  63  * These are used to make use of C type-checking..
  64  */
  65 typedef struct { unsigned long pte; } pte_t;
  66 typedef struct { unsigned long pmd; } pmd_t;
  67 typedef struct { unsigned long pgd; } pgd_t;
  68 typedef struct { unsigned long pgprot; } pgprot_t;
  69
  70 #define pte_val(x)      ((x).pte)
  71 #define pmd_val(x)      ((x).pmd)
  72 #define pgd_val(x)      ((x).pgd)
  73 #define pgprot_val(x)   ((x).pgprot)
  74
  75 #define __pte(x) ((pte_t) { (x) } )
  76 #define __pmd(x) ((pmd_t) { (x) } )
  77 #define __pgd(x) ((pgd_t) { (x) } )
  78 #define __pgprot(x)     ((pgprot_t) { (x) } )
  79
  80 #endif /* !__ASSEMBLY__ */
  81
  82 /* to align the pointer to the (next) page boundary */
  83 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  84
  85 /*
  86  * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
  87  *
  88  *      arch/sh/kernel/vmlinux.lds.S
  89  *
  90  * which has the same constant encoded..
  91  */
  92
  93 #define __MEMORY_START          CONFIG_MEMORY_START
  94 #define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
  95 #ifdef CONFIG_DISCONTIGMEM
  96 /* Just for HP690, for now.. */
  97 #define __MEMORY_START_2ND      (__MEMORY_START+0x02000000)
  98 #define __MEMORY_SIZE_2ND       0x001000000 /* 16MB */
  99 #endif
 100
 101 #define PAGE_OFFSET             (0x80000000UL)
 102 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 103 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 104
 105 #define MAP_NR(addr)            (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
 106
 107 #ifndef CONFIG_DISCONTIGMEM
 108 #define phys_to_page(phys)      (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
 109 #define page_to_phys(page)      (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
 110 #endif
 111
 112 /* PFN start number, because of __MEMORY_START */
 113 #define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 114
 115 #define pfn_to_page(pfn)        (mem_map + (pfn) - PFN_START)
 116 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map) + PFN_START)
 117 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 118 #define pfn_valid(pfn)          (((pfn) - PFN_START) < max_mapnr)
 119 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 120
 121 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 122                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 123
 124 #ifndef __ASSEMBLY__
 125
 126 /* Pure 2^n version of get_order */
 127 static __inline__ int get_order(unsigned long size)
 128 {
 129         int order;
 130
 131         size = (size-1) >> (PAGE_SHIFT-1);
 132         order = -1;
 133         do {
 134                 size >>= 1;
 135                 order++;
 136         } while (size);
 137         return order;
 138 }
 139
 140 #endif
 141
 142 #endif /* __KERNEL__ */
 143
 144 #endif /* __ASM_SH_PAGE_H */