arch/x86/include/asm/bios_ebda.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_BIOS_EBDA_H
   3 #define _ASM_X86_BIOS_EBDA_H
   4
   5 #include <asm/io.h>
   6
   7 /*
   8  * Returns physical address of EBDA.  Returns 0 if there is no EBDA.
   9  */
  10 static inline unsigned int get_bios_ebda(void)
  11 {
  12         /*
  13          * There is a real-mode segmented pointer pointing to the
  14          * 4K EBDA area at 0x40E.
  15          */
  16         unsigned int address = *(unsigned short *)phys_to_virt(0x40E);
  17         address <<= 4;
  18         return address; /* 0 means none */
  19 }
  20
  21 void reserve_bios_regions(void);
  22
  23 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
  24 /*
  25  * This is obviously not a great place for this, but we want to be
  26  * able to scatter it around anywhere in the kernel.
  27  */
  28 void check_for_bios_corruption(void);
  29 void start_periodic_check_for_corruption(void);
  30 #else
  31 static inline void check_for_bios_corruption(void)
  32 {
  33 }
  34
  35 static inline void start_periodic_check_for_corruption(void)
  36 {
  37 }
  38 #endif
  39
  40 #endif /* _ASM_X86_BIOS_EBDA_H */