include/asm-mips64/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 by 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 /* PAGE_SHIFT determines the page size */
  15 #define PAGE_SHIFT      12
  16 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  17 #define PAGE_MASK       (~(PAGE_SIZE-1))
  18
  19 #ifdef __KERNEL__
  20
  21 #ifndef __ASSEMBLY__
  22
  23 extern void (*_clear_page)(void * page);
  24 extern void (*_copy_page)(void * to, void * from);
  25
  26 #define clear_page(page)                _clear_page((void *)(page))
  27 #define copy_page(to, from)             _copy_page((void *)(to), (void *)(from))
  28
  29 extern unsigned long shm_align_mask;
  30
  31 static inline unsigned long pages_do_alias(unsigned long addr1,
  32         unsigned long addr2)
  33 {
  34         return (addr1 ^ addr2) & shm_align_mask;
  35 }
  36
  37 struct page;
  38
  39 static inline void clear_user_page(void *addr, unsigned long vaddr,
  40         struct page *page)
  41 {
  42         extern void (*flush_data_cache_page)(unsigned long addr);
  43
  44         clear_page(addr);
  45         if (pages_do_alias((unsigned long) addr, vaddr))
  46                 flush_data_cache_page((unsigned long)addr);
  47 }
  48
  49 static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  50         struct page *to)
  51 {
  52         extern void (*flush_data_cache_page)(unsigned long addr);
  53
  54         copy_page(vto, vfrom);
  55         if (pages_do_alias((unsigned long)vto, vaddr))
  56                 flush_data_cache_page((unsigned long)vto);
  57 }
  58
  59 /*
  60  * These are used to make use of C type-checking..
  61  */
  62 typedef struct { unsigned long pte; } pte_t;
  63 typedef struct { unsigned long pmd; } pmd_t;
  64 typedef struct { unsigned long pgd; } pgd_t;
  65 typedef struct { unsigned long pgprot; } pgprot_t;
  66
  67 #define pte_val(x)      ((x).pte)
  68 #define pmd_val(x)      ((x).pmd)
  69 #define pgd_val(x)      ((x).pgd)
  70 #define pgprot_val(x)   ((x).pgprot)
  71
  72 #define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
  73
  74 #define __pte(x)        ((pte_t) { (x) } )
  75 #define __pmd(x)        ((pmd_t) { (x) } )
  76 #define __pgd(x)        ((pgd_t) { (x) } )
  77 #define __pgprot(x)     ((pgprot_t) { (x) } )
  78
  79 /* Pure 2^n version of get_order */
  80 static __inline__ int get_order(unsigned long size)
  81 {
  82         int order;
  83
  84         size = (size-1) >> (PAGE_SHIFT-1);
  85         order = -1;
  86         do {
  87                 size >>= 1;
  88                 order++;
  89         } while (size);
  90         return order;
  91 }
  92
  93 #endif /* !__ASSEMBLY__ */
  94
  95 /* to align the pointer to the (next) page boundary */
  96 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  97
  98 /*
  99  * This handles the memory map.
 100  */
 101 #ifdef CONFIG_NONCOHERENT_IO
 102 #define PAGE_OFFSET     0x9800000000000000UL
 103 #else
 104 #define PAGE_OFFSET     0xa800000000000000UL
 105 #endif
 106
 107 #define __pa(x)                 ((unsigned long) (x) - PAGE_OFFSET)
 108 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 109
 110 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 111
 112 #ifndef CONFIG_DISCONTIGMEM
 113 #define pfn_to_page(pfn)        (mem_map + (pfn))
 114 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 115 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 116
 117 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 118 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 119 #endif
 120
 121 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 122                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 123
 124 #define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 125 #define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 126
 127 #endif /* defined (__KERNEL__) */
 128
 129 #endif /* _ASM_PAGE_H */