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Last change
on this file since 80820 was 80721, checked in by vboxsync, 6 years ago |
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Devices/EFI/FirmwareNew: Start upgrade process to edk2-stable201908 (compiles on Windows and works to some extent), bugref:4643
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Property svn:eol-style
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native
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File size:
1.3 KB
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| 1 | /** @file
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| 2 | This code fills in BDA (0x400) and EBDA (pointed to by 0x4xx)
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| 3 | information. There is support for doing initializeation before
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| 4 | Legacy16 is loaded and before a legacy boot is attempted.
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| 5 |
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| 6 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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| 7 |
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| 8 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 9 |
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| 10 | **/
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| 11 |
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| 12 | #include "LegacyBiosInterface.h"
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| 13 |
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| 14 | /**
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| 15 | Fill in the standard BDA and EBDA stuff before Legacy16 load
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| 16 |
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| 17 | @param Private Legacy BIOS Instance data
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| 18 |
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| 19 | @retval EFI_SUCCESS It should always work.
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| 20 |
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| 21 | **/
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| 22 | EFI_STATUS
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| 23 | LegacyBiosInitBda (
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| 24 | IN LEGACY_BIOS_INSTANCE *Private
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| 25 | )
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| 26 | {
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| 27 | BDA_STRUC *Bda;
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| 28 | UINT8 *Ebda;
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| 29 |
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| 30 | Bda = (BDA_STRUC *) ((UINTN) 0x400);
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| 31 | Ebda = (UINT8 *) ((UINTN) 0x9fc00);
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| 32 |
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| 33 | ACCESS_PAGE0_CODE (
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| 34 | ZeroMem (Bda, 0x100);
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| 35 | //
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| 36 | // 640k-1k for EBDA
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| 37 | //
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| 38 | Bda->MemSize = 0x27f;
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| 39 | Bda->KeyHead = 0x1e;
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| 40 | Bda->KeyTail = 0x1e;
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| 41 | Bda->FloppyData = 0x00;
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| 42 | Bda->FloppyTimeout = 0xff;
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| 43 |
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| 44 | Bda->KeyStart = 0x001E;
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| 45 | Bda->KeyEnd = 0x003E;
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| 46 | Bda->KeyboardStatus = 0x10;
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| 47 | Bda->Ebda = 0x9fc0;
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| 48 |
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| 49 | //
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| 50 | // Move LPT time out here and zero out LPT4 since some SCSI OPROMS
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| 51 | // use this as scratch pad (LPT4 is Reserved)
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| 52 | //
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| 53 | Bda->Lpt1_2Timeout = 0x1414;
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| 54 | Bda->Lpt3_4Timeout = 0x1400;
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| 55 |
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| 56 | );
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| 57 |
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| 58 | ZeroMem (Ebda, 0x400);
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| 59 | *Ebda = 0x01;
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| 60 |
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| 61 | return EFI_SUCCESS;
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| 62 | }
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