From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- arch/x86/include/asm/bios_ebda.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 arch/x86/include/asm/bios_ebda.h (limited to 'arch/x86/include/asm/bios_ebda.h') diff --git a/arch/x86/include/asm/bios_ebda.h b/arch/x86/include/asm/bios_ebda.h new file mode 100644 index 000000000..4d5a17e2f --- /dev/null +++ b/arch/x86/include/asm/bios_ebda.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_BIOS_EBDA_H +#define _ASM_X86_BIOS_EBDA_H + +#include + +/* + * 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 */ -- cgit v1.2.3