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