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