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Tom Rini83d290c2018-05-06 17:58:06 -04001/* SPDX-License-Identifier: GPL-2.0 */
Simon Glass0ca24262014-11-14 20:56:32 -07002/*
3 * From Coreboot file device/oprom/realmode/x86.h
4 *
5 * Copyright (C) 2007 Advanced Micro Devices, Inc.
6 * Copyright (C) 2009-2010 coresystems GmbH
Simon Glass0ca24262014-11-14 20:56:32 -07007 */
8
9#ifndef _X86_LIB_BIOS_H
10#define _X86_LIB_BIOS_H
11
Masahiro Yamadae6126a52014-12-03 17:36:57 +090012#include <linux/linkage.h>
13
Simon Glass0ca24262014-11-14 20:56:32 -070014#define REALMODE_BASE 0x600
15
16#ifdef __ASSEMBLY__
17
18#define PTR_TO_REAL_MODE(x) (x - asm_realmode_code + REALMODE_BASE)
19
20#else
21
22/* Convert a symbol address to our real mode area */
23#define PTR_TO_REAL_MODE(sym)\
24 (void *)(REALMODE_BASE + ((char *)&(sym) - (char *)&asm_realmode_code))
25
26/*
27 * The following symbols cannot be used directly. They need to be fixed up
28 * to point to the correct address location after the code has been copied
29 * to REALMODE_BASE. Absolute symbols are not used because those symbols are
30 * relocated by U-Boot.
31 */
32extern unsigned char asm_realmode_call, __realmode_interrupt;
33extern unsigned char asm_realmode_buffer;
34
35#define DOWNTO8(A) \
36 union { \
37 struct { \
38 union { \
39 struct { \
40 uint8_t A##l; \
41 uint8_t A##h; \
42 } __packed; \
43 uint16_t A##x; \
44 } __packed; \
45 uint16_t h##A##x; \
46 } __packed; \
47 uint32_t e##A##x; \
48 } __packed;
49
50#define DOWNTO16(A) \
51 union { \
52 struct { \
53 uint16_t A; \
54 uint16_t h##A; \
55 } __packed; \
56 uint32_t e##A; \
57 } __packed;
58
59struct eregs {
60 DOWNTO8(a);
61 DOWNTO8(c);
62 DOWNTO8(d);
63 DOWNTO8(b);
64 DOWNTO16(sp);
65 DOWNTO16(bp);
66 DOWNTO16(si);
67 DOWNTO16(di);
68 uint32_t vector;
69 uint32_t error_code;
70 uint32_t eip;
71 uint32_t cs;
72 uint32_t eflags;
73};
74
75struct realmode_idt {
76 u16 offset, cs;
77};
78
79void x86_exception(struct eregs *info);
80
81/* From x86_asm.S */
82extern unsigned char __idt_handler;
83extern unsigned int __idt_handler_size;
84extern unsigned char asm_realmode_code;
85extern unsigned int asm_realmode_code_size;
86
87asmlinkage void (*realmode_call)(u32 addr, u32 eax, u32 ebx, u32 ecx, u32 edx,
88 u32 esi, u32 edi);
89
90asmlinkage void (*realmode_interrupt)(u32 intno, u32 eax, u32 ebx, u32 ecx,
91 u32 edx, u32 esi, u32 edi);
92
93int int10_handler(void);
94int int12_handler(void);
95int int16_handler(void);
96int int1a_handler(void);
97#endif /*__ASSEMBLY__ */
98
99#endif