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Linux/arch/x86/include/asm/page_64.h

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  1 #ifndef _ASM_X86_PAGE_64_H
  2 #define _ASM_X86_PAGE_64_H
  3 
  4 #include <asm/page_64_types.h>
  5 
  6 #ifndef __ASSEMBLY__
  7 
  8 /* duplicated to the one in bootmem.h */
  9 extern unsigned long max_pfn;
 10 extern unsigned long phys_base;
 11 
 12 static inline unsigned long __phys_addr_nodebug(unsigned long x)
 13 {
 14         unsigned long y = x - __START_KERNEL_map;
 15 
 16         /* use the carry flag to determine if x was < __START_KERNEL_map */
 17         x = y + ((x > y) ? phys_base : (__START_KERNEL_map - PAGE_OFFSET));
 18 
 19         return x;
 20 }
 21 
 22 #ifdef CONFIG_DEBUG_VIRTUAL
 23 extern unsigned long __phys_addr(unsigned long);
 24 extern unsigned long __phys_addr_symbol(unsigned long);
 25 #else
 26 #define __phys_addr(x)          __phys_addr_nodebug(x)
 27 #define __phys_addr_symbol(x) \
 28         ((unsigned long)(x) - __START_KERNEL_map + phys_base)
 29 #endif
 30 
 31 #define __phys_reloc_hide(x)    (x)
 32 
 33 #ifdef CONFIG_FLATMEM
 34 #define pfn_valid(pfn)          ((pfn) < max_pfn)
 35 #endif
 36 
 37 void clear_page(void *page);
 38 void copy_page(void *to, void *from);
 39 
 40 #endif  /* !__ASSEMBLY__ */
 41 
 42 #ifdef CONFIG_X86_VSYSCALL_EMULATION
 43 # define __HAVE_ARCH_GATE_AREA 1
 44 #endif
 45 
 46 #endif /* _ASM_X86_PAGE_64_H */
 47 

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