release/src-rt/linux/linux-2.6/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 /*
  38  * This gives the physical RAM offset.
  39  */
  40 #ifndef PHYS_OFFSET
  41 #define PHYS_OFFSET             0UL
  42 #endif
  43
  44 /*
  45  * It's normally defined only for FLATMEM config but it's
  46  * used in our early mem init code for all memory models.
  47  * So always define it.
  48  */
  49 #define ARCH_PFN_OFFSET         PFN_UP(PHYS_OFFSET)
  50
  51 #include <linux/pfn.h>
  52 #include <asm/cpu-features.h>
  53 #include <asm/io.h>
  54
  55 extern void clear_page(void * page);
  56 extern void copy_page(void * to, void * from);
  57
  58 extern unsigned long shm_align_mask;
  59 extern unsigned char shm_align_shift;
  60
  61 #define VALIAS_PAGE_OFFSET_MASK (shm_align_mask)
  62 #define VALIAS_PAGE_MASK        (~VALIAS_PAGE_OFFSET_MASK)
  63 #define VALIAS_PAGE_SHIFT       (shm_align_shift)
  64 #define VALIAS_SHIFT            (VALIAS_PAGE_SHIFT - PAGE_SHIFT)
  65 #define VALIAS_PAGE_SIZE        (1UL << VALIAS_PAGE_SHIFT)
  66 #define VALIAS_IDX(x)           ((x) << VALIAS_SHIFT)
  67
  68 static inline unsigned long pages_do_alias(unsigned long addr1,
  69         unsigned long addr2)
  70 {
  71         return (addr1 ^ addr2) & shm_align_mask;
  72 }
  73
  74 struct page;
  75
  76 static inline void clear_user_page(void *addr, unsigned long vaddr,
  77         struct page *page)
  78 {
  79         extern void (*flush_data_cache_page)(unsigned long addr);
  80
  81         clear_page(addr);
  82         if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
  83                 flush_data_cache_page((unsigned long)addr);
  84 }
  85
  86 static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  87         struct page *to)
  88 {
  89         extern void (*flush_data_cache_page)(unsigned long addr);
  90
  91         copy_page(vto, vfrom);
  92         if (!cpu_has_ic_fills_f_dc ||
  93             pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
  94                 flush_data_cache_page((unsigned long)vto);
  95 }
  96
  97 /*
  98  * These are used to make use of C type-checking..
  99  */
 100 #ifdef CONFIG_64BIT_PHYS_ADDR
 101   #ifdef CONFIG_CPU_MIPS32
 102     typedef struct { unsigned long pte_low, pte_high; } pte_t;
 103     #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
 104     #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
 105   #else
 106      typedef struct { unsigned long long pte; } pte_t;
 107      #define pte_val(x) ((x).pte)
 108      #define __pte(x)   ((pte_t) { (x) } )
 109   #endif
 110 #else
 111 typedef struct { unsigned long pte; } pte_t;
 112 #define pte_val(x)      ((x).pte)
 113 #define __pte(x)        ((pte_t) { (x) } )
 114 #endif
 115
 116 /*
 117  * For 3-level pagetables we defines these ourselves, for 2-level the
 118  * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
 119  */
 120 #ifdef CONFIG_64BIT
 121
 122 typedef struct { unsigned long pmd; } pmd_t;
 123 #define pmd_val(x)      ((x).pmd)
 124 #define __pmd(x)        ((pmd_t) { (x) } )
 125
 126 #endif
 127
 128 /*
 129  * Right now we don't support 4-level pagetables, so all pud-related
 130  * definitions come from <asm-generic/pgtable-nopud.h>.
 131  */
 132
 133 /*
 134  * Finall the top of the hierarchy, the pgd
 135  */
 136 typedef struct { unsigned long pgd; } pgd_t;
 137 #define pgd_val(x)      ((x).pgd)
 138 #define __pgd(x)        ((pgd_t) { (x) } )
 139
 140 /*
 141  * Manipulate page protection bits
 142  */
 143 typedef struct { unsigned long pgprot; } pgprot_t;
 144 #define pgprot_val(x)   ((x).pgprot)
 145 #define __pgprot(x)     ((pgprot_t) { (x) } )
 146
 147 /*
 148  * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 149  * pair of pages we only have a single global bit per pair of pages.  When
 150  * writing to the TLB make sure we always have the bit set for both pages
 151  * or none.  This macro is used to access the `buddy' of the pte we're just
 152  * working on.
 153  */
 154 #define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
 155
 156 #endif /* !__ASSEMBLY__ */
 157
 158 /* to align the pointer to the (next) page boundary */
 159 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
 160
 161 /*
 162  * __pa()/__va() should be used only during mem init.
 163  */
 164 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
 165 #define __pa_page_offset(x)     ((unsigned long)(x) < CKSEG0 ? PAGE_OFFSET : CKSEG0)
 166 #else
 167 #define __pa_page_offset(x)     PAGE_OFFSET
 168 #endif
 169 #define __pa(x)         ((unsigned long)(x) - __pa_page_offset(x) + PHYS_OFFSET)
 170 #define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
 171 #define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x),0))
 172
 173 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 174
 175 #ifdef CONFIG_FLATMEM
 176
 177 #define pfn_valid(pfn)                                                  \
 178 ({                                                                      \
 179         unsigned long __pfn = (pfn);                                    \
 180         /* avoid <linux/bootmem.h> include hell */                      \
 181         extern unsigned long min_low_pfn;                               \
 182                                                                         \
 183         __pfn >= min_low_pfn && __pfn < max_mapnr;                      \
 184 })
 185
 186 #elif defined(CONFIG_SPARSEMEM)
 187
 188 /* pfn_valid is defined in linux/mmzone.h */
 189
 190 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
 191
 192 #define pfn_valid(pfn)                                                  \
 193 ({                                                                      \
 194         unsigned long __pfn = (pfn);                                    \
 195         int __n = pfn_to_nid(__pfn);                                    \
 196         ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
 197                                NODE_DATA(__n)->node_spanned_pages)      \
 198                     : 0);                                               \
 199 })
 200
 201 #endif
 202
 203 #define virt_to_page(kaddr)     pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
 204 #define virt_addr_valid(kaddr)  pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
 205
 206 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 207                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 208
 209 #define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 210 #define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 211
 212 #include <asm-generic/memory_model.h>
 213 #include <asm-generic/page.h>
 214
 215 #endif /* defined (__KERNEL__) */
 216
 217 #endif /* _ASM_PAGE_H */