Ventoy/VtoyTool/BabyISO/biso_eltorito.h
2020-04-05 00:08:01 +08:00

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