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 #include <linux/const.h>
  14
  15 /*
  16  * PAGE_SHIFT determines the page size
  17  */
  18 #ifdef CONFIG_PAGE_SIZE_4KB
  19 #define PAGE_SHIFT      12
  20 #endif
  21 #ifdef CONFIG_PAGE_SIZE_8KB
  22 #define PAGE_SHIFT      13
  23 #endif
  24 #ifdef CONFIG_PAGE_SIZE_16KB
  25 #define PAGE_SHIFT      14
  26 #endif
  27 #ifdef CONFIG_PAGE_SIZE_32KB
  28 #define PAGE_SHIFT      15
  29 #endif
  30 #ifdef CONFIG_PAGE_SIZE_64KB
  31 #define PAGE_SHIFT      16
  32 #endif
  33 #define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  34 #define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
  35
  36 #ifdef CONFIG_HUGETLB_PAGE
  37 #define HPAGE_SHIFT     (PAGE_SHIFT + PAGE_SHIFT - 3)
  38 #define HPAGE_SIZE      (_AC(1,UL) << HPAGE_SHIFT)
  39 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  40 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  41 #endif /* CONFIG_HUGETLB_PAGE */
  42
  43 #ifndef __ASSEMBLY__
  44
  45 #include <linux/pfn.h>
  46 #include <asm/io.h>
  47
  48 extern void build_clear_page(void);
  49 extern void build_copy_page(void);
  50
  51 /*
  52  * It's normally defined only for FLATMEM config but it's
  53  * used in our early mem init code for all memory models.
  54  * So always define it.
  55  */
  56 #define ARCH_PFN_OFFSET         PFN_UP(PHYS_OFFSET)
  57
  58 extern void clear_page(void * page);
  59 extern void copy_page(void * to, void * from);
  60
  61 extern unsigned long shm_align_mask;
  62
  63 static inline unsigned long pages_do_alias(unsigned long addr1,
  64         unsigned long addr2)
  65 {
  66         return (addr1 ^ addr2) & shm_align_mask;
  67 }
  68
  69 struct page;
  70
  71 static inline void clear_user_page(void *addr, unsigned long vaddr,
  72         struct page *page)
  73 {
  74         extern void (*flush_data_cache_page)(unsigned long addr);
  75
  76         clear_page(addr);
  77         if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
  78                 flush_data_cache_page((unsigned long)addr);
  79 }
  80
  81 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  82         struct page *to);
  83 struct vm_area_struct;
  84 extern void copy_user_highpage(struct page *to, struct page *from,
  85         unsigned long vaddr, struct vm_area_struct *vma);
  86
  87 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  88
  89 /*
  90  * These are used to make use of C type-checking..
  91  */
  92 #ifdef CONFIG_64BIT_PHYS_ADDR
  93   #ifdef CONFIG_CPU_MIPS32
  94     typedef struct { unsigned long pte_low, pte_high; } pte_t;
  95     #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  96     #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  97   #else
  98      typedef struct { unsigned long long pte; } pte_t;
  99      #define pte_val(x) ((x).pte)
 100      #define __pte(x)   ((pte_t) { (x) } )
 101   #endif
 102 #else
 103 typedef struct { unsigned long pte; } pte_t;
 104 #define pte_val(x)      ((x).pte)
 105 #define __pte(x)        ((pte_t) { (x) } )
 106 #endif
 107 typedef struct page *pgtable_t;
 108
 109 /*
 110  * For 3-level pagetables we defines these ourselves, for 2-level the
 111  * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
 112  */
 113 #ifdef CONFIG_64BIT
 114
 115 typedef struct { unsigned long pmd; } pmd_t;
 116 #define pmd_val(x)      ((x).pmd)
 117 #define __pmd(x)        ((pmd_t) { (x) } )
 118
 119 #endif
 120
 121 /*
 122  * Right now we don't support 4-level pagetables, so all pud-related
 123  * definitions come from <asm-generic/pgtable-nopud.h>.
 124  */
 125
 126 /*
 127  * Finall the top of the hierarchy, the pgd
 128  */
 129 typedef struct { unsigned long pgd; } pgd_t;
 130 #define pgd_val(x)      ((x).pgd)
 131 #define __pgd(x)        ((pgd_t) { (x) } )
 132
 133 /*
 134  * Manipulate page protection bits
 135  */
 136 typedef struct { unsigned long pgprot; } pgprot_t;
 137 #define pgprot_val(x)   ((x).pgprot)
 138 #define __pgprot(x)     ((pgprot_t) { (x) } )
 139
 140 /*
 141  * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 142  * pair of pages we only have a single global bit per pair of pages.  When
 143  * writing to the TLB make sure we always have the bit set for both pages
 144  * or none.  This macro is used to access the `buddy' of the pte we're just
 145  * working on.
 146  */
 147 #define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
 148
 149 #endif /* !__ASSEMBLY__ */
 150
 151 /*
 152  * __pa()/__va() should be used only during mem init.
 153  */
 154 #ifdef CONFIG_64BIT
 155 #define __pa(x)                                                         \
 156 ({                                                                      \
 157     unsigned long __x = (unsigned long)(x);                             \
 158     __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);                     \
 159 })
 160 #else
 161 #define __pa(x)                                                         \
 162     ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
 163 #endif
 164 #define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
 165 #define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
 166
 167 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 168
 169 #ifdef CONFIG_FLATMEM
 170
 171 #define pfn_valid(pfn)                                                  \
 172 ({                                                                      \
 173         unsigned long __pfn = (pfn);                                    \
 174         /* avoid <linux/bootmem.h> include hell */                      \
 175         extern unsigned long min_low_pfn;                               \
 176                                                                         \
 177         __pfn >= min_low_pfn && __pfn < max_mapnr;                      \
 178 })
 179
 180 #elif defined(CONFIG_SPARSEMEM)
 181
 182 /* pfn_valid is defined in linux/mmzone.h */
 183
 184 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
 185
 186 #define pfn_valid(pfn)                                                  \
 187 ({                                                                      \
 188         unsigned long __pfn = (pfn);                                    \
 189         int __n = pfn_to_nid(__pfn);                                    \
 190         ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
 191                                NODE_DATA(__n)->node_spanned_pages)      \
 192                     : 0);                                               \
 193 })
 194
 195 #endif
 196
 197 #define virt_to_page(kaddr)     pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
 198 #define virt_addr_valid(kaddr)  pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
 199
 200 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 201                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 202
 203 #define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 204 #define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 205
 206 #include <asm-generic/memory_model.h>
 207 #include <asm-generic/getorder.h>
 208
 209 #endif /* _ASM_PAGE_H */