arch/mips/include/asm/page.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
   7  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   8  */
   9 #ifndef _ASM_PAGE_H
  10 #define _ASM_PAGE_H
  11
  12 #include <spaces.h>
  13
  14 /*
  15  * PAGE_SHIFT determines the page size
  16  */
  17 #ifdef CONFIG_PAGE_SIZE_4KB
  18 #define PAGE_SHIFT      12
  19 #endif
  20 #ifdef CONFIG_PAGE_SIZE_8KB
  21 #define PAGE_SHIFT      13
  22 #endif
  23 #ifdef CONFIG_PAGE_SIZE_16KB
  24 #define PAGE_SHIFT      14
  25 #endif
  26 #ifdef CONFIG_PAGE_SIZE_64KB
  27 #define PAGE_SHIFT      16
  28 #endif
  29 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  30 #define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
  31
  32 #ifndef __ASSEMBLY__
  33
  34 #include <linux/pfn.h>
  35 #include <asm/io.h>
  36
  37 extern void build_clear_page(void);
  38 extern void build_copy_page(void);
  39
  40 /*
  41  * It's normally defined only for FLATMEM config but it's
  42  * used in our early mem init code for all memory models.
  43  * So always define it.
  44  */
  45 #define ARCH_PFN_OFFSET         PFN_UP(PHYS_OFFSET)
  46
  47 extern void clear_page(void * page);
  48 extern void copy_page(void * to, void * from);
  49
  50 extern unsigned long shm_align_mask;
  51
  52 static inline unsigned long pages_do_alias(unsigned long addr1,
  53         unsigned long addr2)
  54 {
  55         return (addr1 ^ addr2) & shm_align_mask;
  56 }
  57
  58 struct page;
  59
  60 static inline void clear_user_page(void *addr, unsigned long vaddr,
  61         struct page *page)
  62 {
  63         extern void (*flush_data_cache_page)(unsigned long addr);
  64
  65         clear_page(addr);
  66         if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
  67                 flush_data_cache_page((unsigned long)addr);
  68 }
  69
  70 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  71         struct page *to);
  72 struct vm_area_struct;
  73 extern void copy_user_highpage(struct page *to, struct page *from,
  74         unsigned long vaddr, struct vm_area_struct *vma);
  75
  76 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  77
  78 /*
  79  * These are used to make use of C type-checking..
  80  */
  81 #ifdef CONFIG_64BIT_PHYS_ADDR
  82   #ifdef CONFIG_CPU_MIPS32
  83     typedef struct { unsigned long pte_low, pte_high; } pte_t;
  84     #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  85     #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  86   #else
  87      typedef struct { unsigned long long pte; } pte_t;
  88      #define pte_val(x) ((x).pte)
  89      #define __pte(x)   ((pte_t) { (x) } )
  90   #endif
  91 #else
  92 typedef struct { unsigned long pte; } pte_t;
  93 #define pte_val(x)      ((x).pte)
  94 #define __pte(x)        ((pte_t) { (x) } )
  95 #endif
  96 typedef struct page *pgtable_t;
  97
  98 /*
  99  * For 3-level pagetables we defines these ourselves, for 2-level the
 100  * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
 101  */
 102 #ifdef CONFIG_64BIT
 103
 104 typedef struct { unsigned long pmd; } pmd_t;
 105 #define pmd_val(x)      ((x).pmd)
 106 #define __pmd(x)        ((pmd_t) { (x) } )
 107
 108 #endif
 109
 110 /*
 111  * Right now we don't support 4-level pagetables, so all pud-related
 112  * definitions come from <asm-generic/pgtable-nopud.h>.
 113  */
 114
 115 /*
 116  * Finall the top of the hierarchy, the pgd
 117  */
 118 typedef struct { unsigned long pgd; } pgd_t;
 119 #define pgd_val(x)      ((x).pgd)
 120 #define __pgd(x)        ((pgd_t) { (x) } )
 121
 122 /*
 123  * Manipulate page protection bits
 124  */
 125 typedef struct { unsigned long pgprot; } pgprot_t;
 126 #define pgprot_val(x)   ((x).pgprot)
 127 #define __pgprot(x)     ((pgprot_t) { (x) } )
 128
 129 /*
 130  * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 131  * pair of pages we only have a single global bit per pair of pages.  When
 132  * writing to the TLB make sure we always have the bit set for both pages
 133  * or none.  This macro is used to access the `buddy' of the pte we're just
 134  * working on.
 135  */
 136 #define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
 137
 138 #endif /* !__ASSEMBLY__ */
 139
 140 /*
 141  * __pa()/__va() should be used only during mem init.
 142  */
 143 #ifdef CONFIG_64BIT
 144 #define __pa(x)                                                         \
 145 ({                                                                      \
 146     unsigned long __x = (unsigned long)(x);                             \
 147     __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);                     \
 148 })
 149 #else
 150 #define __pa(x)                                                         \
 151     ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
 152 #endif
 153 #define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
 154 #define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
 155
 156 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 157
 158 #ifdef CONFIG_FLATMEM
 159
 160 #define pfn_valid(pfn)          ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
 161
 162 #elif defined(CONFIG_SPARSEMEM)
 163
 164 /* pfn_valid is defined in linux/mmzone.h */
 165
 166 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
 167
 168 #define pfn_valid(pfn)                                                  \
 169 ({                                                                      \
 170         unsigned long __pfn = (pfn);                                    \
 171         int __n = pfn_to_nid(__pfn);                                    \
 172         ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
 173                                NODE_DATA(__n)->node_spanned_pages)      \
 174                     : 0);                                               \
 175 })
 176
 177 #endif
 178
 179 #define virt_to_page(kaddr)     pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
 180 #define virt_addr_valid(kaddr)  pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
 181
 182 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 183                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 184
 185 #define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 186 #define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 187
 188 #include <asm-generic/memory_model.h>
 189 #include <asm-generic/page.h>
 190
 191 #endif /* _ASM_PAGE_H */