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