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_32KB
  27 #define PAGE_SHIFT      15
  28 #endif
  29 #ifdef CONFIG_PAGE_SIZE_64KB
  30 #define PAGE_SHIFT      16
  31 #endif
  32 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  33 #define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
  34
  35 #define HPAGE_SHIFT     (PAGE_SHIFT + PAGE_SHIFT - 3)
  36 #define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
  37 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  38 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  39
  40 #ifndef __ASSEMBLY__
  41
  42 #include <linux/pfn.h>
  43 #include <asm/io.h>
  44
  45 extern void build_clear_page(void);
  46 extern void build_copy_page(void);
  47
  48 /*
  49  * It's normally defined only for FLATMEM config but it's
  50  * used in our early mem init code for all memory models.
  51  * So always define it.
  52  */
  53 #define ARCH_PFN_OFFSET         PFN_UP(PHYS_OFFSET)
  54
  55 extern void clear_page(void * page);
  56 extern void copy_page(void * to, void * from);
  57
  58 extern unsigned long shm_align_mask;
  59
  60 static inline unsigned long pages_do_alias(unsigned long addr1,
  61         unsigned long addr2)
  62 {
  63         return (addr1 ^ addr2) & shm_align_mask;
  64 }
  65
  66 struct page;
  67
  68 static inline void clear_user_page(void *addr, unsigned long vaddr,
  69         struct page *page)
  70 {
  71         extern void (*flush_data_cache_page)(unsigned long addr);
  72
  73         clear_page(addr);
  74         if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
  75                 flush_data_cache_page((unsigned long)addr);
  76 }
  77
  78 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  79         struct page *to);
  80 struct vm_area_struct;
  81 extern void copy_user_highpage(struct page *to, struct page *from,
  82         unsigned long vaddr, struct vm_area_struct *vma);
  83
  84 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  85
  86 /*
  87  * These are used to make use of C type-checking..
  88  */
  89 #ifdef CONFIG_64BIT_PHYS_ADDR
  90   #ifdef CONFIG_CPU_MIPS32
  91     typedef struct { unsigned long pte_low, pte_high; } pte_t;
  92     #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  93     #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  94   #else
  95      typedef struct { unsigned long long pte; } pte_t;
  96      #define pte_val(x) ((x).pte)
  97      #define __pte(x)   ((pte_t) { (x) } )
  98   #endif
  99 #else
 100 typedef struct { unsigned long pte; } pte_t;
 101 #define pte_val(x)      ((x).pte)
 102 #define __pte(x)        ((pte_t) { (x) } )
 103 #endif
 104 typedef struct page *pgtable_t;
 105
 106 /*
 107  * For 3-level pagetables we defines these ourselves, for 2-level the
 108  * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
 109  */
 110 #ifdef CONFIG_64BIT
 111
 112 typedef struct { unsigned long pmd; } pmd_t;
 113 #define pmd_val(x)      ((x).pmd)
 114 #define __pmd(x)        ((pmd_t) { (x) } )
 115
 116 #endif
 117
 118 /*
 119  * Right now we don't support 4-level pagetables, so all pud-related
 120  * definitions come from <asm-generic/pgtable-nopud.h>.
 121  */
 122
 123 /*
 124  * Finall the top of the hierarchy, the pgd
 125  */
 126 typedef struct { unsigned long pgd; } pgd_t;
 127 #define pgd_val(x)      ((x).pgd)
 128 #define __pgd(x)        ((pgd_t) { (x) } )
 129
 130 /*
 131  * Manipulate page protection bits
 132  */
 133 typedef struct { unsigned long pgprot; } pgprot_t;
 134 #define pgprot_val(x)   ((x).pgprot)
 135 #define __pgprot(x)     ((pgprot_t) { (x) } )
 136
 137 /*
 138  * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 139  * pair of pages we only have a single global bit per pair of pages.  When
 140  * writing to the TLB make sure we always have the bit set for both pages
 141  * or none.  This macro is used to access the `buddy' of the pte we're just
 142  * working on.
 143  */
 144 #define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
 145
 146 #endif /* !__ASSEMBLY__ */
 147
 148 /*
 149  * __pa()/__va() should be used only during mem init.
 150  */
 151 #ifdef CONFIG_64BIT
 152 #define __pa(x)                                                         \
 153 ({                                                                      \
 154     unsigned long __x = (unsigned long)(x);                             \
 155     __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);                     \
 156 })
 157 #else
 158 #define __pa(x)                                                         \
 159     ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
 160 #endif
 161 #define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
 162 #define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
 163
 164 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 165
 166 #ifdef CONFIG_FLATMEM
 167
 168 #define pfn_valid(pfn)                                                  \
 169 ({                                                                      \
 170         unsigned long __pfn = (pfn);                                    \
 171         /* avoid <linux/bootmem.h> include hell */                      \
 172         extern unsigned long min_low_pfn;                               \
 173                                                                         \
 174         __pfn >= min_low_pfn && __pfn < max_mapnr;                      \
 175 })
 176
 177 #elif defined(CONFIG_SPARSEMEM)
 178
 179 /* pfn_valid is defined in linux/mmzone.h */
 180
 181 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
 182
 183 #define pfn_valid(pfn)                                                  \
 184 ({                                                                      \
 185         unsigned long __pfn = (pfn);                                    \
 186         int __n = pfn_to_nid(__pfn);                                    \
 187         ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
 188                                NODE_DATA(__n)->node_spanned_pages)      \
 189                     : 0);                                               \
 190 })
 191
 192 #endif
 193
 194 #define virt_to_page(kaddr)     pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
 195 #define virt_addr_valid(kaddr)  pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
 196
 197 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 198                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 199
 200 #define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 201 #define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 202
 203 #include <asm-generic/memory_model.h>
 204 #include <asm-generic/getorder.h>
 205
 206 #endif /* _ASM_PAGE_H */