[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / bios_ebda.h

#ifndef _ASM_X86_BIOS_EBDA_H
#define _ASM_X86_BIOS_EBDA_H

#include <asm/io.h>

/*
 * Returns physical address of EBDA.  Returns 0 if there is no EBDA.
 */
static inline unsigned int get_bios_ebda(void)
{
	/*
	 * There is a real-mode segmented pointer pointing to the
	 * 4K EBDA area at 0x40E.
	 */
	unsigned int address = *(unsigned short *)phys_to_virt(0x40E);
	address <<= 4;
	return address;	/* 0 means none */
}

void reserve_bios_regions(void);

#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
/*
 * This is obviously not a great place for this, but we want to be
 * able to scatter it around anywhere in the kernel.
 */
void check_for_bios_corruption(void);
void start_periodic_check_for_corruption(void);
#else
static inline void check_for_bios_corruption(void)
{
}

static inline void start_periodic_check_for_corruption(void)
{
}
#endif

#endif /* _ASM_X86_BIOS_EBDA_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_BIOS_EBDA_H
1965aae3 PA	2	#define _ASM_X86_BIOS_EBDA_H
1da177e4	3
2c0903f2 AM	4	#include <asm/io.h>
2c0903f2 AM	5
1da177e4	6	/*
f548ccd4	7	* Returns physical address of EBDA. Returns 0 if there is no EBDA.
1da177e4 LT	8	*/
	9	static inline unsigned int get_bios_ebda(void)
	10	{
f548ccd4 MW	11	/*
	12	* There is a real-mode segmented pointer pointing to the
	13	* 4K EBDA area at 0x40E.
	14	*/
1da177e4 LT	15	unsigned int address = (unsigned short )phys_to_virt(0x40E);
	16	address <<= 4;
	17	return address; /* 0 means none */
	18	}
	19
edce2121	20	void reserve_bios_regions(void);
0c51a965	21
46eaa670 IM	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
1965aae3	39	#endif /* _ASM_X86_BIOS_EBDA_H */