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 /*
  19  * PAGE_SHIFT determines the page size
  20  */
  21 #ifdef CONFIG_PAGE_SIZE_4KB
  22 #define PAGE_SHIFT      12
  23 #endif
  24 #ifdef CONFIG_PAGE_SIZE_8KB
  25 #define PAGE_SHIFT      13
  26 #endif
  27 #ifdef CONFIG_PAGE_SIZE_16KB
  28 #define PAGE_SHIFT      14
  29 #endif
  30 #ifdef CONFIG_PAGE_SIZE_64KB
  31 #define PAGE_SHIFT      16
  32 #endif
  33 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  34 #define PAGE_MASK       (~(PAGE_SIZE-1))
  35
  36 #ifndef __ASSEMBLY__
  37
  38 extern void clear_page(void * page);
  39 extern void copy_page(void * to, void * from);
  40
  41 extern unsigned long shm_align_mask;
  42
  43 static inline unsigned long pages_do_alias(unsigned long addr1,
  44         unsigned long addr2)
  45 {
  46         return (addr1 ^ addr2) & shm_align_mask;
  47 }
  48
  49 struct page;
  50
  51 static inline void clear_user_page(void *addr, unsigned long vaddr,
  52         struct page *page)
  53 {
  54         extern void (*flush_data_cache_page)(unsigned long addr);
  55
  56         clear_page(addr);
  57         if (pages_do_alias((unsigned long) addr, vaddr))
  58                 flush_data_cache_page((unsigned long)addr);
  59 }
  60
  61 static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  62         struct page *to)
  63 {
  64         extern void (*flush_data_cache_page)(unsigned long addr);
  65
  66         copy_page(vto, vfrom);
  67         if (pages_do_alias((unsigned long)vto, vaddr))
  68                 flush_data_cache_page((unsigned long)vto);
  69 }
  70
  71 /*
  72  * These are used to make use of C type-checking..
  73  */
  74 #ifdef CONFIG_64BIT_PHYS_ADDR
  75 typedef struct { unsigned long long pte; } pte_t;
  76 #else
  77 typedef struct { unsigned long pte; } pte_t;
  78 #endif
  79 typedef struct { unsigned long pmd; } pmd_t;
  80 typedef struct { unsigned long pgd; } pgd_t;
  81 typedef struct { unsigned long pgprot; } pgprot_t;
  82
  83 #define pte_val(x)      ((x).pte)
  84 #define pmd_val(x)      ((x).pmd)
  85 #define pgd_val(x)      ((x).pgd)
  86 #define pgprot_val(x)   ((x).pgprot)
  87
  88 #define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
  89
  90 #define __pte(x)        ((pte_t) { (x) } )
  91 #define __pmd(x)        ((pmd_t) { (x) } )
  92 #define __pgd(x)        ((pgd_t) { (x) } )
  93 #define __pgprot(x)     ((pgprot_t) { (x) } )
  94
  95 /* Pure 2^n version of get_order */
  96 static __inline__ int get_order(unsigned long size)
  97 {
  98         int order;
  99
 100         size = (size-1) >> (PAGE_SHIFT-1);
 101         order = -1;
 102         do {
 103                 size >>= 1;
 104                 order++;
 105         } while (size);
 106         return order;
 107 }
 108
 109 #endif /* !__ASSEMBLY__ */
 110
 111 /* to align the pointer to the (next) page boundary */
 112 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
 113
 114 #define __pa(x)                 ((unsigned long) (x) - PAGE_OFFSET)
 115 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 116
 117 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 118
 119 #ifndef CONFIG_DISCONTIGMEM
 120 #define pfn_to_page(pfn)        (mem_map + (pfn))
 121 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 122 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 123 #endif
 124
 125 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 126 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 127
 128 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 129                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 130
 131 #define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 132 #define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 133
 134 #endif /* defined (__KERNEL__) */
 135
 136 #ifdef CONFIG_LIMITED_DMA
 137 #define WANT_PAGE_VIRTUAL
 138 #endif
 139
 140 #endif /* _ASM_PAGE_H */