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 #include <linux/config.h>
  13
  14 #ifdef __KERNEL__
  15
  16 #include <spaces.h>
  17
  18 #endif
  19
  20 /*
  21  * PAGE_SHIFT determines the page size
  22  */
  23 #ifdef CONFIG_PAGE_SIZE_4KB
  24 #define PAGE_SHIFT      12
  25 #endif
  26 #ifdef CONFIG_PAGE_SIZE_8KB
  27 #define PAGE_SHIFT      13
  28 #endif
  29 #ifdef CONFIG_PAGE_SIZE_16KB
  30 #define PAGE_SHIFT      14
  31 #endif
  32 #ifdef CONFIG_PAGE_SIZE_64KB
  33 #define PAGE_SHIFT      16
  34 #endif
  35 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  36 #define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
  37
  38
  39 #ifdef __KERNEL__
  40 #ifndef __ASSEMBLY__
  41
  42 extern void clear_page(void * page);
  43 extern void copy_page(void * to, void * from);
  44
  45 extern unsigned long shm_align_mask;
  46
  47 static inline unsigned long pages_do_alias(unsigned long addr1,
  48         unsigned long addr2)
  49 {
  50         return (addr1 ^ addr2) & shm_align_mask;
  51 }
  52
  53 struct page;
  54
  55 static inline void clear_user_page(void *addr, unsigned long vaddr,
  56         struct page *page)
  57 {
  58         extern void (*flush_data_cache_page)(unsigned long addr);
  59
  60         clear_page(addr);
  61         if (pages_do_alias((unsigned long) addr, vaddr))
  62                 flush_data_cache_page((unsigned long)addr);
  63 }
  64
  65 static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  66         struct page *to)
  67 {
  68         extern void (*flush_data_cache_page)(unsigned long addr);
  69
  70         copy_page(vto, vfrom);
  71         if (pages_do_alias((unsigned long)vto, vaddr))
  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   #else
  83      typedef struct { unsigned long long pte; } pte_t;
  84      #define pte_val(x) ((x).pte)
  85   #endif
  86 #else
  87 typedef struct { unsigned long pte; } pte_t;
  88 #define pte_val(x)      ((x).pte)
  89 #endif
  90
  91 typedef struct { unsigned long pmd; } pmd_t;
  92 typedef struct { unsigned long pgd; } pgd_t;
  93 typedef struct { unsigned long pgprot; } pgprot_t;
  94
  95 #define pmd_val(x)      ((x).pmd)
  96 #define pgd_val(x)      ((x).pgd)
  97 #define pgprot_val(x)   ((x).pgprot)
  98
  99 #define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
 100
 101 #define __pte(x)        ((pte_t) { (x) } )
 102 #define __pmd(x)        ((pmd_t) { (x) } )
 103 #define __pgd(x)        ((pgd_t) { (x) } )
 104 #define __pgprot(x)     ((pgprot_t) { (x) } )
 105
 106 /* Pure 2^n version of get_order */
 107 static __inline__ int get_order(unsigned long size)
 108 {
 109         int order;
 110
 111         size = (size-1) >> (PAGE_SHIFT-1);
 112         order = -1;
 113         do {
 114                 size >>= 1;
 115                 order++;
 116         } while (size);
 117         return order;
 118 }
 119
 120 #endif /* !__ASSEMBLY__ */
 121
 122 /* to align the pointer to the (next) page boundary */
 123 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
 124
 125 #define __pa(x)                 ((unsigned long) (x) - PAGE_OFFSET)
 126 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 127
 128 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 129
 130 #ifndef CONFIG_DISCONTIGMEM
 131 #define pfn_to_page(pfn)        (mem_map + (pfn))
 132 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 133 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 134 #endif
 135
 136 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 137 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 138
 139 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 140                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 141
 142 #define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 143 #define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 144
 145 #endif /* defined (__KERNEL__) */
 146
 147 #ifdef CONFIG_LIMITED_DMA
 148 #define WANT_PAGE_VIRTUAL
 149 #endif
 150
 151 #endif /* _ASM_PAGE_H */