include/asm-arm26/page.h

   1 #ifndef _ASMARM_PAGE_H
   2 #define _ASMARM_PAGE_H
   3
   4 #include <linux/config.h>
   5
   6 #ifdef __KERNEL__
   7 #ifndef __ASSEMBLY__
   8
   9 extern void __clear_user_page(void *p, unsigned long user);
  10 extern void __copy_user_page(void *to, const void *from, unsigned long user);
  11 extern void copy_page(void *to, const void *from);
  12
  13 //FIXME these may be wrong on ARM26
  14 #define clear_user_page(addr,vaddr,pg)                  \
  15         do {                                            \
  16                 preempt_disable();                      \
  17                 __clear_user_page(addr, vaddr); \
  18                 preempt_enable();                       \
  19         } while (0)
  20
  21 #define copy_user_page(to,from,vaddr,pg)                \
  22         do {                                            \
  23                 preempt_disable();                      \
  24                 __copy_user_page(to, from, vaddr);      \
  25                 preempt_enable();                       \
  26         } while (0)
  27
  28 #define clear_page(page)        memzero((void *)(page), PAGE_SIZE)
  29 #define copy_page(to, from)  __copy_user_page(to, from, 0);
  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 pgd; } pgd_t;
  38 typedef struct { unsigned long pte; } pte_t;
  39 typedef struct { unsigned long pmd; } pmd_t;
  40 typedef struct { unsigned long pgprot; } pgprot_t;
  41
  42 #define pgd_val(x)      ((x).pgd)
  43 #define pte_val(x)      ((x).pte)
  44 #define pmd_val(x)      ((x).pmd)
  45 #define pgprot_val(x)   ((x).pgprot)
  46
  47 #define __pte(x)        ((pte_t) { (x) } )
  48 #define __pmd(x)        ((pmd_t) { (x) } )
  49 #define __pgprot(x)     ((pgprot_t) { (x) } )
  50
  51 #else
  52 /*
  53  * .. while these make it easier on the compiler
  54  */
  55 typedef unsigned long pgd_t;
  56 typedef unsigned long pte_t;
  57 typedef unsigned long pmd_t;
  58 typedef unsigned long pgprot_t;
  59
  60 //FIXME - should these cast to unsigned long?
  61 #define pgd_val(x)      (x)
  62 #define pte_val(x)      (x)
  63 #define pmd_val(x)      (x)
  64 #define pgprot_val(x)   (x)
  65
  66 #define __pte(x)        (x)
  67 #define __pmd(x)        (x)
  68 #define __pgprot(x)     (x)
  69
  70 #endif /* STRICT_MM_TYPECHECKS */
  71 #endif /* !__ASSEMBLY__ */
  72 #endif /* __KERNEL__ */
  73
  74 /* PAGE_SHIFT determines the page size.  This is configurable. */
  75 #if defined(CONFIG_PAGESIZE_16)
  76 #define PAGE_SHIFT      14              /* 16K */
  77 #else           /* default */
  78 #define PAGE_SHIFT      15              /* 32K */
  79 #endif
  80
  81 #define EXEC_PAGESIZE   32768
  82
  83 #define PAGE_SIZE               (1UL << PAGE_SHIFT)
  84 #define PAGE_MASK               (~(PAGE_SIZE-1))
  85
  86 /* to align the pointer to the (next) page boundary */
  87 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  88
  89 #ifdef __KERNEL__
  90 #ifndef __ASSEMBLY__
  91
  92 /* Pure 2^n version of get_order */
  93 static inline int get_order(unsigned long size)
  94 {
  95         int order;
  96
  97         size = (size-1) >> (PAGE_SHIFT-1);
  98         order = -1;
  99         do {
 100                 size >>= 1;
 101                 order++;
 102         } while (size);
 103         return order;
 104 }
 105
 106 #include <asm/memory.h>
 107
 108 #endif /* !__ASSEMBLY__ */
 109
 110 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 111                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 112
 113 #endif /* __KERNEL__ */
 114
 115 #endif