LXR uboot/arch/x86/lib/bios.h

   1/*
   2 * From Coreboot file device/oprom/realmode/x86.h
   3 *
   4 * Copyright (C) 2007 Advanced Micro Devices, Inc.
   5 * Copyright (C) 2009-2010 coresystems GmbH
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0
   8 */
   9
  10#ifndef _X86_LIB_BIOS_H
  11#define _X86_LIB_BIOS_H
  12
  13#include <linux/linkage.h>
  14
  15#define REALMODE_BASE           0x600
  16
  17#ifdef __ASSEMBLY__
  18
  19#define PTR_TO_REAL_MODE(x)     (x - asm_realmode_code + REALMODE_BASE)
  20
  21#else
  22
  23/* Convert a symbol address to our real mode area */
  24#define PTR_TO_REAL_MODE(sym)\
  25        (void *)(REALMODE_BASE + ((char *)&(sym) - (char *)&asm_realmode_code))
  26
  27/*
  28 * The following symbols cannot be used directly. They need to be fixed up
  29 * to point to the correct address location after the code has been copied
  30 * to REALMODE_BASE. Absolute symbols are not used because those symbols are
  31 * relocated by U-Boot.
  32 */
  33extern unsigned char asm_realmode_call, __realmode_interrupt;
  34extern unsigned char asm_realmode_buffer;
  35
  36#define DOWNTO8(A) \
  37        union { \
  38                struct { \
  39                        union { \
  40                                struct { \
  41                                        uint8_t A##l; \
  42                                        uint8_t A##h; \
  43                                } __packed; \
  44                                uint16_t A##x; \
  45                        } __packed; \
  46                        uint16_t h##A##x; \
  47                } __packed; \
  48                uint32_t e##A##x; \
  49        } __packed;
  50
  51#define DOWNTO16(A) \
  52        union { \
  53                struct { \
  54                        uint16_t A; \
  55                        uint16_t h##A; \
  56                } __packed; \
  57                uint32_t e##A; \
  58        } __packed;
  59
  60struct eregs {
  61        DOWNTO8(a);
  62        DOWNTO8(c);
  63        DOWNTO8(d);
  64        DOWNTO8(b);
  65        DOWNTO16(sp);
  66        DOWNTO16(bp);
  67        DOWNTO16(si);
  68        DOWNTO16(di);
  69        uint32_t vector;
  70        uint32_t error_code;
  71        uint32_t eip;
  72        uint32_t cs;
  73        uint32_t eflags;
  74};
  75
  76struct realmode_idt {
  77        u16 offset, cs;
  78};
  79
  80void x86_exception(struct eregs *info);
  81
  82/* From x86_asm.S */
  83extern unsigned char __idt_handler;
  84extern unsigned int __idt_handler_size;
  85extern unsigned char asm_realmode_code;
  86extern unsigned int asm_realmode_code_size;
  87
  88asmlinkage void (*realmode_call)(u32 addr, u32 eax, u32 ebx, u32 ecx, u32 edx,
  89                                 u32 esi, u32 edi);
  90
  91asmlinkage void (*realmode_interrupt)(u32 intno, u32 eax, u32 ebx, u32 ecx,
  92                                      u32 edx, u32 esi, u32 edi);
  93
  94int int10_handler(void);
  95int int12_handler(void);
  96int int16_handler(void);
  97int int1a_handler(void);
  98#endif /*__ASSEMBLY__ */
  99
 100#endif
 101