arch/x86/include/asm/bios_ebda.h

   1 #ifndef _ASM_X86_BIOS_EBDA_H
   2 #define _ASM_X86_BIOS_EBDA_H
   3
   4 #include <asm/io.h>
   5
   6 /*
   7  * Returns physical address of EBDA.  Returns 0 if there is no EBDA.
   8  */
   9 static inline unsigned int get_bios_ebda(void)
  10 {
  11         /*
  12          * There is a real-mode segmented pointer pointing to the
  13          * 4K EBDA area at 0x40E.
  14          */
  15         unsigned int address = *(unsigned short *)phys_to_virt(0x40E);
  16         address <<= 4;
  17         return address; /* 0 means none */
  18 }
  19
  20 void reserve_bios_regions(void);
  21
  22 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
  23 /*
  24  * This is obviously not a great place for this, but we want to be
  25  * able to scatter it around anywhere in the kernel.
  26  */
  27 void check_for_bios_corruption(void);
  28 void start_periodic_check_for_corruption(void);
  29 #else
  30 static inline void check_for_bios_corruption(void)
  31 {
  32 }
  33
  34 static inline void start_periodic_check_for_corruption(void)
  35 {
  36 }
  37 #endif
  38
  39 #endif /* _ASM_X86_BIOS_EBDA_H */