include/asm-ppc/page.h

   1 #include <linux/config.h>
   2 #ifndef __ASSEMBLY__
   3 #include <asm/system.h> /* for xmon definition */
   4 #endif /* ndef __ASSEMBLY__ */
   5
   6 #ifndef _PPC_PAGE_H
   7 #define _PPC_PAGE_H
   8
   9 /* PAGE_SHIFT determines the page size */
  10 #define PAGE_SHIFT      12
  11 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  12 #define PAGE_MASK       (~(PAGE_SIZE-1))
  13
  14 #define PAGE_OFFSET     0xc0000000
  15 #define KERNELBASE      PAGE_OFFSET
  16
  17 #ifndef __ASSEMBLY__
  18 #ifdef __KERNEL__
  19
  20 #ifdef CONFIG_XMON
  21 #define BUG() do { \
  22         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
  23         xmon(0); \
  24 } while (0)
  25 #else
  26 #define BUG() do { \
  27         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
  28         __asm__ __volatile__(".long 0x0"); \
  29 } while (0)
  30 #endif
  31 #define PAGE_BUG(page) do { BUG(); } while (0)
  32
  33 #define STRICT_MM_TYPECHECKS
  34
  35 #ifdef STRICT_MM_TYPECHECKS
  36 /*
  37  * These are used to make use of C type-checking..
  38  */
  39 typedef struct { unsigned long pte; } pte_t;
  40 typedef struct { unsigned long pmd; } pmd_t;
  41 typedef struct { unsigned long pgd; } pgd_t;
  42 typedef struct { unsigned long pgprot; } pgprot_t;
  43
  44 #define pte_val(x)      ((x).pte)
  45 #define pmd_val(x)      ((x).pmd)
  46 #define pgd_val(x)      ((x).pgd)
  47 #define pgprot_val(x)   ((x).pgprot)
  48
  49 #define __pte(x)        ((pte_t) { (x) } )
  50 #define __pmd(x)        ((pmd_t) { (x) } )
  51 #define __pgd(x)        ((pgd_t) { (x) } )
  52 #define __pgprot(x)     ((pgprot_t) { (x) } )
  53
  54 #else
  55 /*
  56  * .. while these make it easier on the compiler
  57  */
  58 typedef unsigned long pte_t;
  59 typedef unsigned long pmd_t;
  60 typedef unsigned long pgd_t;
  61 typedef unsigned long pgprot_t;
  62
  63 #define pte_val(x)      (x)
  64 #define pmd_val(x)      (x)
  65 #define pgd_val(x)      (x)
  66 #define pgprot_val(x)   (x)
  67
  68 #define __pte(x)        (x)
  69 #define __pmd(x)        (x)
  70 #define __pgd(x)        (x)
  71 #define __pgprot(x)     (x)
  72
  73 #endif
  74
  75
  76 /* align addr on a size boundry - adjust address up if needed -- Cort */
  77 #define _ALIGN(addr,size)       (((addr)+size-1)&(~(size-1)))
  78
  79 /* to align the pointer to the (next) page boundary */
  80 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  81
  82 extern void clear_page(void *page);
  83 extern void copy_page(void *to, void *from);
  84 #define clear_user_page(page, vaddr)    clear_page(page)
  85 #define copy_user_page(to, from, vaddr) copy_page(to, from)
  86
  87 /* map phys->virtual and virtual->phys for RAM pages */
  88 static inline unsigned long ___pa(unsigned long v)
  89 {
  90         unsigned long p;
  91         asm volatile ("1: addis %0, %1, %2;"
  92                       ".section \".vtop_fixup\",\"aw\";"
  93                       ".align  1;"
  94                       ".long   1b;"
  95                       ".previous;"
  96                       : "=r" (p)
  97                       : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
  98
  99         return p;
 100 }
 101 static inline void* ___va(unsigned long p)
 102 {
 103         unsigned long v;
 104         asm volatile ("1: addis %0, %1, %2;"
 105                       ".section \".ptov_fixup\",\"aw\";"
 106                       ".align  1;"
 107                       ".long   1b;"
 108                       ".previous;"
 109                       : "=r" (v)
 110                       : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
 111
 112         return (void*) v;
 113 }
 114 #define __pa(x) ___pa ((unsigned long)(x))
 115 #define __va(x) ___va ((unsigned long)(x))
 116
 117 #define MAP_NR(addr)            (((unsigned long)addr-PAGE_OFFSET) >> PAGE_SHIFT)
 118 #define MAP_PAGE_RESERVED       (1<<15)
 119
 120 extern unsigned long get_zero_page_fast(void);
 121
 122 /* Pure 2^n version of get_order */
 123 extern __inline__ int get_order(unsigned long size)
 124 {
 125         int order;
 126
 127         size = (size-1) >> (PAGE_SHIFT-1);
 128         order = -1;
 129         do {
 130                 size >>= 1;
 131                 order++;
 132         } while (size);
 133         return order;
 134 }
 135
 136 #endif /* __KERNEL__ */
 137 #endif /* __ASSEMBLY__ */
 138 #endif /* _PPC_PAGE_H */