arch/unicore32/include/asm/page.h

   1 /*
   2  * linux/arch/unicore32/include/asm/page.h
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  * Copyright (C) 2001-2010 GUAN Xue-tao
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #ifndef __UNICORE_PAGE_H__
  13 #define __UNICORE_PAGE_H__
  14
  15 /* PAGE_SHIFT determines the page size */
  16 #define PAGE_SHIFT              12
  17 #define PAGE_SIZE               (_AC(1, UL) << PAGE_SHIFT)
  18 #define PAGE_MASK               (~(PAGE_SIZE-1))
  19
  20 #ifndef __ASSEMBLY__
  21
  22 struct page;
  23 struct vm_area_struct;
  24
  25 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  26 extern void copy_page(void *to, const void *from);
  27
  28 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  29 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  30
  31 #undef STRICT_MM_TYPECHECKS
  32
  33 #ifdef STRICT_MM_TYPECHECKS
  34 /*
  35  * These are used to make use of C type-checking..
  36  */
  37 typedef struct { unsigned long pte; } pte_t;
  38 typedef struct { unsigned long pgd; } pgd_t;
  39 typedef struct { unsigned long pgprot; } pgprot_t;
  40
  41 #define pte_val(x)      ((x).pte)
  42 #define pgd_val(x)      ((x).pgd)
  43 #define pgprot_val(x)   ((x).pgprot)
  44
  45 #define __pte(x)        ((pte_t) { (x) })
  46 #define __pgd(x)        ((pgd_t) { (x) })
  47 #define __pgprot(x)     ((pgprot_t) { (x) })
  48
  49 #else
  50 /*
  51  * .. while these make it easier on the compiler
  52  */
  53 typedef unsigned long pte_t;
  54 typedef unsigned long pgd_t;
  55 typedef unsigned long pgprot_t;
  56
  57 #define pte_val(x)      (x)
  58 #define pgd_val(x)      (x)
  59 #define pgprot_val(x)   (x)
  60
  61 #define __pte(x)        (x)
  62 #define __pgd(x)        (x)
  63 #define __pgprot(x)     (x)
  64
  65 #endif /* STRICT_MM_TYPECHECKS */
  66
  67 typedef struct page *pgtable_t;
  68
  69 extern int pfn_valid(unsigned long);
  70
  71 #include <asm/memory.h>
  72
  73 #endif /* !__ASSEMBLY__ */
  74
  75 #define VM_DATA_DEFAULT_FLAGS \
  76         (VM_READ | VM_WRITE | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  77
  78 #include <asm-generic/getorder.h>
  79
  80 #endif