Specifications

Code Definitions

3.2 EfiCompatibility Code

Legacy BIOS Protocol

EFI_LEGACY_BIOS_PROTOCOL

Summary

Abstracts the traditional BIOS from the rest of EFI. The LegacyBoot() member

function allows the BDS to support booting a traditional OS. EFI thunks drivers that

make EFI bindings for BIOS INT services use all the other member functions.

GUID

// { DB9A1E3D-45CB-4ABB-853B-E5387FDB2E2D}

#define EFI_LEGACY_BIOS_PROTOCOL_GUID \

{ 0xdb9a1e3d, 0x45cb, 0x4abb, 0x85, 0x3b, 0xe5, 0x38, 0x7f,

0xdb, 0x2e, 0x2d }

Protocol Interface Structure

typedef struct _EFI_LEGACY_BIOS_PROTOCOL {

EFI_LEGACY_BIOS_INT86 Int86;

EFI_LEGACY_BIOS_FARCALL86 FarCall86;

EFI_LEGACY_BIOS_CHECK_ROM

CheckPciRom;

EFI_LEGACY_BIOS_INSTALL_ROM

InstallPciRom;

EFI_LEGACY_BIOS_BOOT

LegacyBoot;

EFI_LEGACY_BIOS_UPDATE_KEYBOARD_LED_STATUS

UpdateKeyboardLedStatus;

EFI_LEGACY_BIOS_GET_BBS_INFO GetBbsInfo;

EFI_LEGACY_BIOS_SHADOW_ALL_LEGACY_OPROMS

ShadowAllLegacyOproms;

EFI_LEGACY_BIOS_PREPARE_TO_BOOT_EFI PrepareToBootEFI;

EFI_LEGACY_BIOS_GET_LEGACY_REGION GetLegacyRegion;

EFI_LEGACY_BIOS_COPY_LEGACY_REGION CopyLegacyRegion;

EFI_LEGACY_BIOS_BOOT_UNCONVENTIONAL_DEVICE

BootUnconventionalDevice;

} EFI_LEGACY_BIOS_PROTOCOL;