162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 262306a36Sopenharmony_ci#ifndef _ASM_X86_BIOS_EBDA_H 362306a36Sopenharmony_ci#define _ASM_X86_BIOS_EBDA_H 462306a36Sopenharmony_ci 562306a36Sopenharmony_ci#include <asm/io.h> 662306a36Sopenharmony_ci 762306a36Sopenharmony_ci/* 862306a36Sopenharmony_ci * Returns physical address of EBDA. Returns 0 if there is no EBDA. 962306a36Sopenharmony_ci */ 1062306a36Sopenharmony_cistatic inline unsigned int get_bios_ebda(void) 1162306a36Sopenharmony_ci{ 1262306a36Sopenharmony_ci /* 1362306a36Sopenharmony_ci * There is a real-mode segmented pointer pointing to the 1462306a36Sopenharmony_ci * 4K EBDA area at 0x40E. 1562306a36Sopenharmony_ci */ 1662306a36Sopenharmony_ci unsigned int address = *(unsigned short *)phys_to_virt(0x40E); 1762306a36Sopenharmony_ci address <<= 4; 1862306a36Sopenharmony_ci return address; /* 0 means none */ 1962306a36Sopenharmony_ci} 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_civoid reserve_bios_regions(void); 2262306a36Sopenharmony_ci 2362306a36Sopenharmony_ci#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 2462306a36Sopenharmony_ci/* 2562306a36Sopenharmony_ci * This is obviously not a great place for this, but we want to be 2662306a36Sopenharmony_ci * able to scatter it around anywhere in the kernel. 2762306a36Sopenharmony_ci */ 2862306a36Sopenharmony_civoid check_for_bios_corruption(void); 2962306a36Sopenharmony_civoid start_periodic_check_for_corruption(void); 3062306a36Sopenharmony_ci#else 3162306a36Sopenharmony_cistatic inline void check_for_bios_corruption(void) 3262306a36Sopenharmony_ci{ 3362306a36Sopenharmony_ci} 3462306a36Sopenharmony_ci 3562306a36Sopenharmony_cistatic inline void start_periodic_check_for_corruption(void) 3662306a36Sopenharmony_ci{ 3762306a36Sopenharmony_ci} 3862306a36Sopenharmony_ci#endif 3962306a36Sopenharmony_ci 4062306a36Sopenharmony_ci#endif /* _ASM_X86_BIOS_EBDA_H */ 41