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/******************************************************************************
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* bios_eltorito.h
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*
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* Copyright (c) 2020, longpanda <admin@ventoy.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/*
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* EL TORITO扩展规范相关定义
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* 注意点:
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* [1] EL TORITO扩展规范里定义的数据都是小字节序的
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*/
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#ifndef __BISO_ELTORITO_H__
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#define __BISO_ELTORITO_H__
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/*
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* EL TORITO规范里对于Boot Record里面BootCatlog指向的扩展区域做了
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* 结构定义，分成一条条的表项，每一条表项固定32个字节长,1个扇区
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* 可以保存64条表项。BootCatlog可以占用多个扇区。
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* 表项必须按照如下顺序保存:
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* ID Entry
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* 0 Validation Entry
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* 1 Initial Entry
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* 2 Section Header
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* 3 Section Entry
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* 4 Section Extension Entry 1
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* 5 Section Extension Entry 2
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* 6 Section Extension Entry 3
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* ....
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* N Section Header
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* N+1 Section Entry
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* N+2 Section Extension Entry 1
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* N+3 Section Extension Entry 2
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* N+4 Section Extension Entry 3
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* ....
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*/
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#define BISO_ELTORITO_ENTRY_LEN 32
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#pragma pack(1)
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/* 检验表项, 必须是第一条 */
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typedef struct tagBISO_TORITO_VALIDATION_ENTRY
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{
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UCHAR ucHeaderID; /* Must be 01 */
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/*
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* PlatID: CPU平台架构
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* 0x00: x86
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* 0x01: PowerPC
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* 0x02: Mac
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* 0xEF: EFI System Partition
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*/
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UCHAR ucPlatID;
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UINT16 usResv;
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/* ID，一般用来保存CD-ROM的制造商信息 */
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CHAR szID[24];
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/*
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* 校验补充字段, 注意[1]
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* 这个字段用来保证整个Validation Entry的数据
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* 按照WORD(双字节)累加起来为0(截取之后)
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*/
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UINT16 usCheckSum;
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/* 魔数字，检验使用，值必须为0x55和0xAA */
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UCHAR ucData55;
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UCHAR ucDataAA;
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}BISO_TORITO_VALIDATION_ENTRY_S;
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/* 默认初始化表项(BIOS里面的 INT 13) */
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typedef struct tagBISO_TORITO_INITIAL_ENTRY
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{
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/* BOOTID: 0x88:Bootable, 00:Not Bootable */
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UCHAR ucBootId;
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/*
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* ucBootMedia:
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* Bit0 - Bit3的值:
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* 0: No Emulation
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* 1: 1.2 meg diskette
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* 2: 1.44 meg diskette
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* 3: 2.88 meg diskette
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* 4: Hard Disk(drive 80)
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* 5-F:保留
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* Bit4 - Bit7:保留
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*/
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UCHAR ucBootMedia;
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/* 启动段，只对x86构架有效，为0默认使用7C0, 注意[1] */
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UINT16 usLoadSegment;
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/* 是Boot Image里面Partition Table的第5个字节(System Type) */
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UCHAR ucSystemType;
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UCHAR ucResv;
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/* 启动时每次往内存读多长, 注意[1] */
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UINT16 usSectorCount;
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/* 启动文件所在的起始逻辑块编号，例如isolinux.bin文件的位置, 注意[1] */
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UINT32 uiLoadRBA;
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UCHAR aucResv[20];
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}BISO_TORITO_INITIAL_ENTRY_S;
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/*
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* Section Header, 补充一系列可启动的Entry(比如UEFI启动)
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* 如果默认的Initial/Default Entry不满足BIOS需求
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* BIOS可以继续往下找，根据Section Header里面的ID
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* 以及Section Entry里面的Criteria信息决定是否从
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* 该条Entry启动
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*
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*/
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typedef struct tagBISO_TORITO_SECHDR_ENTRY
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{
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/* ucFlag: 0x90:表示后面还有Header, 0x91:表示最后一个Header */
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UCHAR ucFlag;
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/*
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* PlatID: CPU平台架构
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* 0x00: x86
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* 0x01: PowerPC
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* 0x02: Mac
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* 0xEF: EFI System Partition
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*/
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UCHAR ucPlatID;
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/* 跟在这个头的后面有多少个Section Entry */
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UINT16 usSecEntryNum;
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/* ID信息 */
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CHAR szId[28];
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}BISO_TORITO_SECHDR_ENTRY_S;
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/* Section Entry */
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typedef struct tagBISO_TORITO_SECTION_ENTRY
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{
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/* BOOTID: 88:Bootable, 00:Not Bootable */
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UCHAR ucBootId;
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/*
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* ucBootMedia:
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* Bit0 - Bit3的值:
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* 0: No Emulation
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* 1: 1.2 meg diskette
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* 2: 1.44 meg diskette
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* 3: 2.88 meg diskette
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* 4: Hard Disk(drive 80)
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* 5-F:保留
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* Bit4:保留
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* Bit5:Continuation Entry Follows
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* Bit6:Image contains an ATAPI driver
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* Bit7:Image contains SCSI driver
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*/
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UCHAR ucFlag;
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/* 启动段，只对x86构架有效，为0默认使用7C0, 注意[1] */
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UINT16 usLoadSegment;
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/* 是Boot Image里面Partition Table的第5个字节(System Type) */
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UCHAR ucSystemType;
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UCHAR ucResv;
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/* 启动时每次往内存读多长, 注意[1] */
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UINT16 usSectorCount;
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/* 启动文件所在的起始逻辑块编号，例如isolinux.bin文件的位置, 注意[1] */
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UINT32 uiLoadRBA;
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/*
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* 它的值描述了后面的aucCriteria的格式
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* 0: 没有
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* 1: Language and Version Information (IBM)
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* 2-FF - Reserved
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*/
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UCHAR ucCriteriaType;
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/* Criteria信息，如果这19个字节不够用，可以使用Section Extension Entry里的 */
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UCHAR aucCriteria[19];
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}BISO_TORITO_SECTION_ENTRY_S;
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/* 扩展Section Entry */
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typedef struct tagBISO_TORITO_SECEXT_ENTRY
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{
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/* ucExtId: 必须为44 */
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UCHAR ucExtId;
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/*
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* ucFlag: 只有Bit5有用
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* Bit5: 1表示后面还有Extension Record 0表示最后一个
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*/
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UCHAR ucFlag;
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/* Criteria信息 */
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UCHAR aucCriteria[39];
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}BISO_TORITO_SECEXT_ENTRY_S;
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#pragma pack()
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/*
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* 当前缓冲区指针位置向前1条Entry
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* 如果已经超过了2048字节，则继续从文件中读
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*/
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#define BISO_ELTORITO_ENTRY_STEP(pstSection, pstFile, aucBuf, stMBuf) \
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{\
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UINT _uiReadLen;\
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pstSection++;\
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if ((UCHAR *)pstSection >= aucBuf + BISO_SECTOR_SIZE)\
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{\
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(VOID)BISO_MBUF_Append(&stMBuf, BISO_SECTOR_SIZE, aucBuf);\
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_uiReadLen = (UINT)BISO_PLAT_ReadFile(pstFile, 1, BISO_SECTOR_SIZE, aucBuf);\
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if (_uiReadLen != BISO_SECTOR_SIZE)\
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{\
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BISO_DIAG("Read Len %u, sector len %u.", _uiReadLen, BISO_SECTOR_SIZE);\
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BISO_MBUF_Free(&stMBuf);\
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return BISO_ERR_READ_FILE;\
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}\
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pstSection = (BISO_TORITO_SECTION_ENTRY_S *)aucBuf;\
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}\
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}
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ULONG BISO_ELTORITO_ReadBootInfo(IN BISO_FILE_S *pstFile, OUT BISO_PARSER_S *pstParser);
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VOID BISO_ELTORITO_Dump(IN CONST BISO_PARSER_S *pstParser);
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UINT BISO_ELTORITO_GetBootEntryNum(IN CONST BISO_PARSER_S *pstParser);
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#endif /* __BISO_ELTORITO_H__ */
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