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 /* PAGE_SHIFT determines the page size */
  17 #if defined(CONFIG_PAGE_SIZE_4KB)
  18 # define PAGE_SHIFT     12
  19 #elif defined(CONFIG_PAGE_SIZE_8KB)
  20 # define PAGE_SHIFT     13
  21 #elif defined(CONFIG_PAGE_SIZE_64KB)
  22 # define PAGE_SHIFT     16
  23 #else
  24 # error "Bogus kernel page size?"
  25 #endif
  26
  27 #ifdef __ASSEMBLY__
  28 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  29 #else
  30 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  31 #endif
  32
  33 #define PAGE_MASK       (~(PAGE_SIZE-1))
  34 #define PTE_MASK        PAGE_MASK
  35
  36 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  37 #define HPAGE_SHIFT     16
  38 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  39 #define HPAGE_SHIFT     18
  40 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  41 #define HPAGE_SHIFT     20
  42 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  43 #define HPAGE_SHIFT     22
  44 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
  45 #define HPAGE_SHIFT     26
  46 #endif
  47
  48 #ifdef CONFIG_HUGETLB_PAGE
  49 #define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  50 #define HPAGE_MASK              (~(HPAGE_SIZE-1))
  51 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  52 #endif
  53
  54 #ifdef __KERNEL__
  55 #ifndef __ASSEMBLY__
  56
  57 extern void (*clear_page)(void *to);
  58 extern void (*copy_page)(void *to, void *from);
  59
  60 extern unsigned long shm_align_mask;
  61
  62 #ifdef CONFIG_MMU
  63 extern void clear_page_slow(void *to);
  64 extern void copy_page_slow(void *to, void *from);
  65 #else
  66 extern void clear_page_nommu(void *to);
  67 extern void copy_page_nommu(void *to, void *from);
  68 #endif
  69
  70 #if defined(CONFIG_MMU) && (defined(CONFIG_CPU_SH4) || \
  71         defined(CONFIG_SH7705_CACHE_32KB))
  72 struct page;
  73 extern void clear_user_page(void *to, unsigned long address, struct page *pg);
  74 extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
  75 extern void __clear_user_page(void *to, void *orig_to);
  76 extern void __copy_user_page(void *to, void *from, void *orig_to);
  77 #elif defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH3) || !defined(CONFIG_MMU)
  78 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  79 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  80 #endif
  81
  82 /*
  83  * These are used to make use of C type-checking..
  84  */
  85 #ifdef CONFIG_X2TLB
  86 typedef struct { unsigned long pte_low, pte_high; } pte_t;
  87 typedef struct { unsigned long long pgprot; } pgprot_t;
  88 #define pte_val(x) \
  89         ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  90 #define __pte(x) \
  91         ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  92 #else
  93 typedef struct { unsigned long pte_low; } pte_t;
  94 typedef struct { unsigned long pgprot; } pgprot_t;
  95 #define pte_val(x)      ((x).pte_low)
  96 #define __pte(x) ((pte_t) { (x) } )
  97 #endif
  98
  99 typedef struct { unsigned long pgd; } pgd_t;
 100
 101 #define pgd_val(x)      ((x).pgd)
 102 #define pgprot_val(x)   ((x).pgprot)
 103
 104 #define __pgd(x) ((pgd_t) { (x) } )
 105 #define __pgprot(x)     ((pgprot_t) { (x) } )
 106
 107 #endif /* !__ASSEMBLY__ */
 108
 109 /* to align the pointer to the (next) page boundary */
 110 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 111
 112 /*
 113  * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
 114  *
 115  *      arch/sh/kernel/vmlinux.lds.S
 116  *
 117  * which has the same constant encoded..
 118  */
 119
 120 #define __MEMORY_START          CONFIG_MEMORY_START
 121 #define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
 122
 123 #define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 124 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 125 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 126
 127 #define MAP_NR(addr)            (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
 128
 129 #define phys_to_page(phys)      (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
 130 #define page_to_phys(page)      (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
 131
 132 /* PFN start number, because of __MEMORY_START */
 133 #define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 134 #define ARCH_PFN_OFFSET         (PFN_START)
 135 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 136 #define pfn_valid(pfn)          (((pfn) - PFN_START) < max_mapnr)
 137 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 138
 139 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 140                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 141
 142 #include <asm-generic/memory_model.h>
 143 #include <asm-generic/page.h>
 144
 145 /* vDSO support */
 146 #ifdef CONFIG_VSYSCALL
 147 #define __HAVE_ARCH_GATE_AREA
 148 #endif
 149
 150 #endif /* __KERNEL__ */
 151 #endif /* __ASM_SH_PAGE_H */