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/* SPDX-License-Identifier: GPL-2.0 */
/*
* From Coreboot file device/oprom/realmode/x86.h
*
* Copyright (C) 2007 Advanced Micro Devices, Inc.
* Copyright (C) 2009-2010 coresystems GmbH
*/
#ifndef _X86_LIB_BIOS_H
#define _X86_LIB_BIOS_H
#include <linux/linkage.h>
#define REALMODE_BASE 0x600
#ifdef __ASSEMBLY__
#define PTR_TO_REAL_MODE(x) (x - asm_realmode_code + REALMODE_BASE)
#else
/* Convert a symbol address to our real mode area */
#define PTR_TO_REAL_MODE(sym)\
(void *)(REALMODE_BASE + ((char *)&(sym) - (char *)&asm_realmode_code))
/*
* The following symbols cannot be used directly. They need to be fixed up
* to point to the correct address location after the code has been copied
* to REALMODE_BASE. Absolute symbols are not used because those symbols are
* relocated by U-Boot.
*/
extern unsigned char asm_realmode_call, __realmode_interrupt;
extern unsigned char asm_realmode_buffer;
#define DOWNTO8(A) \
union { \
struct { \
union { \
struct { \
uint8_t A##l; \
uint8_t A##h; \
} __packed; \
uint16_t A##x; \
} __packed; \
uint16_t h##A##x; \
} __packed; \
uint32_t e##A##x; \
} __packed;
#define DOWNTO16(A) \
union { \
struct { \
uint16_t A; \
uint16_t h##A; \
} __packed; \
uint32_t e##A; \
} __packed;
struct eregs {
DOWNTO8(a);
DOWNTO8(c);
DOWNTO8(d);
DOWNTO8(b);
DOWNTO16(sp);
DOWNTO16(bp);
DOWNTO16(si);
DOWNTO16(di);
uint32_t vector;
uint32_t error_code;
uint32_t eip;
uint32_t cs;
uint32_t eflags;
};
struct realmode_idt {
u16 offset, cs;
};
void x86_exception(struct eregs *info);
/* From x86_asm.S */
extern unsigned char __idt_handler;
extern unsigned int __idt_handler_size;
extern unsigned char asm_realmode_code;
extern unsigned int asm_realmode_code_size;
asmlinkage void (*realmode_call)(u32 addr, u32 eax, u32 ebx, u32 ecx, u32 edx,
u32 esi, u32 edi);
asmlinkage void (*realmode_interrupt)(u32 intno, u32 eax, u32 ebx, u32 ecx,
u32 edx, u32 esi, u32 edi);
int int10_handler(void);
int int12_handler(void);
int int16_handler(void);
int int1a_handler(void);
#endif /*__ASSEMBLY__ */
#endif
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