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