arch/x86/include/asm/page_64.h

   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 #include <asm/alternative.h>
   8
   9 /* duplicated to the one in bootmem.h */
  10 extern unsigned long max_pfn;
  11 extern unsigned long phys_base;
  12
  13 static inline unsigned long __phys_addr_nodebug(unsigned long x)
  14 {
  15         unsigned long y = x - __START_KERNEL_map;
  16
  17         /* use the carry flag to determine if x was < __START_KERNEL_map */
  18         x = y + ((x > y) ? phys_base : (__START_KERNEL_map - PAGE_OFFSET));
  19
  20         return x;
  21 }
  22
  23 #ifdef CONFIG_DEBUG_VIRTUAL
  24 extern unsigned long __phys_addr(unsigned long);
  25 extern unsigned long __phys_addr_symbol(unsigned long);
  26 #else
  27 #define __phys_addr(x)          __phys_addr_nodebug(x)
  28 #define __phys_addr_symbol(x) \
  29         ((unsigned long)(x) - __START_KERNEL_map + phys_base)
  30 #endif
  31
  32 #define __phys_reloc_hide(x)    (x)
  33
  34 #ifdef CONFIG_FLATMEM
  35 #define pfn_valid(pfn)          ((pfn) < max_pfn)
  36 #endif
  37
  38 void clear_page_orig(void *page);
  39 void clear_page_rep(void *page);
  40 void clear_page_erms(void *page);
  41
  42 static inline void clear_page(void *page)
  43 {
  44         alternative_call_2(clear_page_orig,
  45                            clear_page_rep, X86_FEATURE_REP_GOOD,
  46                            clear_page_erms, X86_FEATURE_ERMS,
  47                            "=D" (page),
  48                            "0" (page)
  49                            : "memory", "rax", "rcx");
  50 }
  51
  52 void copy_page(void *to, void *from);
  53
  54 #endif  /* !__ASSEMBLY__ */
  55
  56 #ifdef CONFIG_X86_VSYSCALL_EMULATION
  57 # define __HAVE_ARCH_GATE_AREA 1
  58 #endif
  59
  60 #endif /* _ASM_X86_PAGE_64_H */