mirror of https://github.com/ventoy/Ventoy
247 lines
6.6 KiB
C
247 lines
6.6 KiB
C
/******************************************************************************
|
||
* 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__ */
|
||
|