include/asm-v850/page.h

   1 /*
   2  * include/asm-v850/page.h -- VM ops
   3  *
   4  *  Copyright (C) 2001,02,03  NEC Electronics Corporation
   5  *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License.  See the file COPYING in the main directory of this
   9  * archive for more details.
  10  *
  11  * Written by Miles Bader <miles@gnu.org>
  12  */
  13
  14 #ifndef __V850_PAGE_H__
  15 #define __V850_PAGE_H__
  16
  17 #include <asm/machdep.h>
  18
  19
  20 #define PAGE_SHIFT      12
  21 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  22 #define PAGE_MASK       (~(PAGE_SIZE-1))
  23
  24
  25 /*
  26  * PAGE_OFFSET -- the first address of the first page of memory. For archs with
  27  * no MMU this corresponds to the first free page in physical memory (aligned
  28  * on a page boundary).
  29  */
  30 #ifndef PAGE_OFFSET
  31 #define PAGE_OFFSET  0x0000000
  32 #endif
  33
  34
  35 #ifdef __KERNEL__
  36 #ifndef __ASSEMBLY__
  37
  38 #define STRICT_MM_TYPECHECKS
  39
  40 #define clear_page(page)        memset ((void *)(page), 0, PAGE_SIZE)
  41 #define copy_page(to, from)     memcpy ((void *)(to), (void *)from, PAGE_SIZE)
  42
  43 #define clear_user_page(addr, vaddr, page)      \
  44         do {    clear_page(addr);               \
  45                 flush_dcache_page(page);        \
  46         } while (0)
  47 #define copy_user_page(to, from, vaddr, page)   \
  48         do {    copy_page(to, from);            \
  49                 flush_dcache_page(page);        \
  50         } while (0)
  51
  52 #ifdef STRICT_MM_TYPECHECKS
  53 /*
  54  * These are used to make use of C type-checking..
  55  */
  56
  57 typedef struct { unsigned long pte; } pte_t;
  58 typedef struct { unsigned long pmd; } pmd_t;
  59 typedef struct { unsigned long pgd; } pgd_t;
  60 typedef struct { unsigned long pgprot; } pgprot_t;
  61
  62 #define pte_val(x)      ((x).pte)
  63 #define pmd_val(x)      ((x).pmd)
  64 #define pgd_val(x)      ((x).pgd)
  65 #define pgprot_val(x)   ((x).pgprot)
  66
  67 #define __pte(x)        ((pte_t) { (x) } )
  68 #define __pmd(x)        ((pmd_t) { (x) } )
  69 #define __pgd(x)        ((pgd_t) { (x) } )
  70 #define __pgprot(x)     ((pgprot_t) { (x) } )
  71
  72 #else /* !STRICT_MM_TYPECHECKS */
  73 /*
  74  * .. while these make it easier on the compiler
  75  */
  76
  77 typedef unsigned long pte_t;
  78 typedef unsigned long pmd_t;
  79 typedef unsigned long pgd_t;
  80 typedef unsigned long pgprot_t;
  81
  82 #define pte_val(x)      (x)
  83 #define pmd_val(x)      (x)
  84 #define pgd_val(x)      (x)
  85 #define pgprot_val(x)   (x)
  86
  87 #define __pte(x)        (x)
  88 #define __pmd(x)        (x)
  89 #define __pgd(x)        (x)
  90 #define __pgprot(x)     (x)
  91
  92 #endif /* STRICT_MM_TYPECHECKS */
  93
  94 #endif /* !__ASSEMBLY__ */
  95
  96
  97 /* to align the pointer to the (next) page boundary */
  98 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  99
 100
 101 #ifndef __ASSEMBLY__
 102
 103 /* Pure 2^n version of get_order */
 104 extern __inline__ int get_order (unsigned long size)
 105 {
 106         int order;
 107
 108         size = (size-1) >> (PAGE_SHIFT-1);
 109         order = -1;
 110         do {
 111                 size >>= 1;
 112                 order++;
 113         } while (size);
 114         return order;
 115 }
 116
 117 #endif /* !__ASSEMBLY__ */
 118
 119
 120 /* No current v850 processor has virtual memory.  */
 121 #define __virt_to_phys(addr)    (addr)
 122 #define __phys_to_virt(addr)    (addr)
 123
 124 #define virt_to_pfn(kaddr)      (__virt_to_phys (kaddr) >> PAGE_SHIFT)
 125 #define pfn_to_virt(pfn)        __phys_to_virt ((pfn) << PAGE_SHIFT)
 126
 127 #define MAP_NR(kaddr) \
 128   (((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT)
 129 #define virt_to_page(kaddr)     (mem_map + MAP_NR (kaddr))
 130 #define page_to_virt(page) \
 131   ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
 132
 133 #define pfn_to_page(pfn)        virt_to_page (pfn_to_virt (pfn))
 134 #define page_to_pfn(page)       virt_to_pfn (page_to_virt (page))
 135
 136 #define virt_addr_valid(kaddr)                                          \
 137   (((void *)(kaddr) >= (void *)PAGE_OFFSET) && MAP_NR (kaddr) < max_mapnr)
 138
 139
 140 #define __pa(x)              __virt_to_phys ((unsigned long)(x))
 141 #define __va(x)              ((void *)__phys_to_virt ((unsigned long)(x)))
 142
 143
 144 #endif /* KERNEL */
 145
 146 #endif /* __V850_PAGE_H__ */