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