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
  17 /* PAGE_SHIFT determines the page size */
  18 #define PAGE_SHIFT      12
  19
  20 #ifdef __ASSEMBLY__
  21 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  22 #else
  23 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  24 #endif
  25
  26 #define PAGE_MASK       (~(PAGE_SIZE-1))
  27 #define PTE_MASK        PAGE_MASK
  28
  29 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  30 #define HPAGE_SHIFT     16
  31 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  32 #define HPAGE_SHIFT     20
  33 #endif
  34
  35 #ifdef CONFIG_HUGETLB_PAGE
  36 #define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  37 #define HPAGE_MASK              (~(HPAGE_SIZE-1))
  38 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  39 #endif
  40
  41 #ifdef __KERNEL__
  42 #ifndef __ASSEMBLY__
  43
  44 extern void (*clear_page)(void *to);
  45 extern void (*copy_page)(void *to, void *from);
  46
  47 extern unsigned long shm_align_mask;
  48
  49 #ifdef CONFIG_MMU
  50 extern void clear_page_slow(void *to);
  51 extern void copy_page_slow(void *to, void *from);
  52 #else
  53 extern void clear_page_nommu(void *to);
  54 extern void copy_page_nommu(void *to, void *from);
  55 #endif
  56
  57 #if defined(CONFIG_MMU) && (defined(CONFIG_CPU_SH4) || \
  58         defined(CONFIG_SH7705_CACHE_32KB))
  59 struct page;
  60 extern void clear_user_page(void *to, unsigned long address, struct page *pg);
  61 extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
  62 extern void __clear_user_page(void *to, void *orig_to);
  63 extern void __copy_user_page(void *to, void *from, void *orig_to);
  64 #elif defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH3) || !defined(CONFIG_MMU)
  65 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  66 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  67 #endif
  68
  69 /*
  70  * These are used to make use of C type-checking..
  71  */
  72 typedef struct { unsigned long pte; } pte_t;
  73 typedef struct { unsigned long pgd; } pgd_t;
  74 typedef struct { unsigned long pgprot; } pgprot_t;
  75
  76 #define pte_val(x)      ((x).pte)
  77 #define pgd_val(x)      ((x).pgd)
  78 #define pgprot_val(x)   ((x).pgprot)
  79
  80 #define __pte(x) ((pte_t) { (x) } )
  81 #define __pgd(x) ((pgd_t) { (x) } )
  82 #define __pgprot(x)     ((pgprot_t) { (x) } )
  83
  84 #endif /* !__ASSEMBLY__ */
  85
  86 /* to align the pointer to the (next) page boundary */
  87 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  88
  89 /*
  90  * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
  91  *
  92  *      arch/sh/kernel/vmlinux.lds.S
  93  *
  94  * which has the same constant encoded..
  95  */
  96
  97 #define __MEMORY_START          CONFIG_MEMORY_START
  98 #define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
  99
 100 #define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 101 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 102 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 103
 104 #define MAP_NR(addr)            (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
 105
 106 #define phys_to_page(phys)      (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
 107 #define page_to_phys(page)      (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
 108
 109 /* PFN start number, because of __MEMORY_START */
 110 #define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 111 #define ARCH_PFN_OFFSET         (PFN_START)
 112 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 113 #define pfn_valid(pfn)          (((pfn) - PFN_START) < max_mapnr)
 114 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 115
 116 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 117                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 118
 119 #include <asm-generic/memory_model.h>
 120 #include <asm-generic/page.h>
 121
 122 /* vDSO support */
 123 #ifdef CONFIG_VSYSCALL
 124 #define __HAVE_ARCH_GATE_AREA
 125 #endif
 126
 127 #endif /* __KERNEL__ */
 128 #endif /* __ASM_SH_PAGE_H */