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