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_ebda_region(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 */ 40