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