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(address: 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 */ |
41 | |