18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci#ifndef _ASM_X86_BIOS_EBDA_H 38c2ecf20Sopenharmony_ci#define _ASM_X86_BIOS_EBDA_H 48c2ecf20Sopenharmony_ci 58c2ecf20Sopenharmony_ci#include <asm/io.h> 68c2ecf20Sopenharmony_ci 78c2ecf20Sopenharmony_ci/* 88c2ecf20Sopenharmony_ci * Returns physical address of EBDA. Returns 0 if there is no EBDA. 98c2ecf20Sopenharmony_ci */ 108c2ecf20Sopenharmony_cistatic inline unsigned int get_bios_ebda(void) 118c2ecf20Sopenharmony_ci{ 128c2ecf20Sopenharmony_ci /* 138c2ecf20Sopenharmony_ci * There is a real-mode segmented pointer pointing to the 148c2ecf20Sopenharmony_ci * 4K EBDA area at 0x40E. 158c2ecf20Sopenharmony_ci */ 168c2ecf20Sopenharmony_ci unsigned int address = *(unsigned short *)phys_to_virt(0x40E); 178c2ecf20Sopenharmony_ci address <<= 4; 188c2ecf20Sopenharmony_ci return address; /* 0 means none */ 198c2ecf20Sopenharmony_ci} 208c2ecf20Sopenharmony_ci 218c2ecf20Sopenharmony_civoid reserve_bios_regions(void); 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION 248c2ecf20Sopenharmony_ci/* 258c2ecf20Sopenharmony_ci * This is obviously not a great place for this, but we want to be 268c2ecf20Sopenharmony_ci * able to scatter it around anywhere in the kernel. 278c2ecf20Sopenharmony_ci */ 288c2ecf20Sopenharmony_civoid check_for_bios_corruption(void); 298c2ecf20Sopenharmony_civoid start_periodic_check_for_corruption(void); 308c2ecf20Sopenharmony_ci#else 318c2ecf20Sopenharmony_cistatic inline void check_for_bios_corruption(void) 328c2ecf20Sopenharmony_ci{ 338c2ecf20Sopenharmony_ci} 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_cistatic inline void start_periodic_check_for_corruption(void) 368c2ecf20Sopenharmony_ci{ 378c2ecf20Sopenharmony_ci} 388c2ecf20Sopenharmony_ci#endif 398c2ecf20Sopenharmony_ci 408c2ecf20Sopenharmony_ci#endif /* _ASM_X86_BIOS_EBDA_H */ 41