include/asm-powerpc/page_32.h

   1 #ifndef _ASM_POWERPC_PAGE_32_H
   2 #define _ASM_POWERPC_PAGE_32_H
   3
   4 #define VM_DATA_DEFAULT_FLAGS   VM_DATA_DEFAULT_FLAGS32
   5
   6 #define PPC_MEMSTART    0
   7
   8 #ifndef __ASSEMBLY__
   9 /*
  10  * The basic type of a PTE - 64 bits for those CPUs with > 32 bit
  11  * physical addressing.  For now this just the IBM PPC440.
  12  */
  13 #ifdef CONFIG_PTE_64BIT
  14 typedef unsigned long long pte_basic_t;
  15 #define PTE_SHIFT       (PAGE_SHIFT - 3)        /* 512 ptes per page */
  16 #define PTE_FMT         "%16Lx"
  17 #else
  18 typedef unsigned long pte_basic_t;
  19 #define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  20 #define PTE_FMT         "%.8lx"
  21 #endif
  22
  23 struct page;
  24 extern void clear_pages(void *page, int order);
  25 static inline void clear_page(void *page) { clear_pages(page, 0); }
  26 extern void copy_page(void *to, void *from);
  27
  28 /* Pure 2^n version of get_order */
  29 extern __inline__ int get_order(unsigned long size)
  30 {
  31         int lz;
  32
  33         size = (size-1) >> PAGE_SHIFT;
  34         asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
  35         return 32 - lz;
  36 }
  37
  38 #endif /* __ASSEMBLY__ */
  39
  40 #endif /* _ASM_POWERPC_PAGE_32_H */