📄 fat32mountvolumeid.lst
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89 =2 DWORD BPB_TotSec32;
90 =2 union FATUni
91 =2 {
92 =2 struct BootSecFAT32Str F32;
93 =2 struct BootSecFAT16Str F16;
94 =2 }FAT;
95 =2
96 =2 };
97 =2
98 =2 struct DPTStr //分区表结构
99 =2 {
100 =2 BYTE BootFlag;
101 =2 BYTE CHSBegin[3];
102 =2 BYTE TypeCode;
C51 COMPILER V8.08 FAT32MOUNTVOLUMEID 06/01/2008 16:21:00 PAGE 9
103 =2 BYTE CHSEnd[3];
104 =2 DWORD LBABegin;
105 =2 DWORD CntSec;
106 =2 };
107 =2
108 =2 struct sDPTStr //简化的分区表
109 =2 {
110 =2 BYTE TypeCode;
111 =2 DWORD LBABegin;
112 =2 DWORD CntSec;
113 =2 };
114 =2
115 =2 struct FAT32FSInfoStr //FAT32扩展信息结构
116 =2 {
117 =2 DWORD LeadSig;
118 =2 BYTE Reserved1[480];
119 =2 DWORD StrucSig;
120 =2 DWORD FreeCount;
121 =2 DWORD NxtFree;
122 =2 BYTE Reserved2[12];
123 =2 DWORD TrailSig;
124 =2 };
125 =2
126 =2 struct FAT32SDirStr //FAT目录结构 短文件名
127 =2 {
128 =2 CHAR Name[11];
129 =2 BYTE Attr;
130 =2 BYTE NTRes;
131 =2 BYTE CrtTimeTenth;
132 =2 WORD CrtTime;
133 =2 WORD CrtDate;
134 =2 WORD LstAccDate;
135 =2 WORD FstClusHI;
136 =2 WORD WrtTime;
137 =2 WORD WrtDate;
138 =2 WORD FstClusLO;
139 =2 DWORD FileSize;
140 =2 };
141 =2
142 =2 struct FAT32LDirStr //FAT目录结构 长文件名
143 =2 {
144 =2 BYTE Ord;
145 =2 BYTE Name1[10];
146 =2 BYTE Attr;
147 =2 BYTE Type;
148 =2 BYTE Chksum;
149 =2 BYTE Name2[12];
150 =2 WORD FstClusLO;
151 =2 BYTE Name3[4];
152 =2 };
153 =2
154 =2 struct FAT32Str //FAT32参数表
155 =2 {
156 =2 BYTE ClusSecCnt; //当前簇扇区计数
157 =2 DWORD CurrentDirectory; //当前目录入口（簇号）
158 =2 BYTE SecPerClus; //每簇扇区数 1 2 4 8 16 32 64 128
159 =2 WORD RsvdSecCnt; //保留扇区数 0x20
160 =2 BYTE NumFATs; //FAT表个数 2
161 =2 DWORD RootClus; //根目录开始的簇
162 =2 DWORD ClusSec; //簇开始的扇区
163 =2 DWORD FATSz; //FAT表大小（扇区）
164 =2 DWORD FATSec; //FAT表开始扇区
C51 COMPILER V8.08 FAT32MOUNTVOLUMEID 06/01/2008 16:21:00 PAGE 10
165 =2 DWORD FSISec; //FSI所在扇区
166 =2 DWORD FSIFreeCount; //空闲簇数
167 =2 DWORD FSINxtFree; //空闲簇搜索指针
168 =2 };
169 =2
170 =2 struct FCBStr
171 =2 {
172 =2 CHAR FileName[12]; //文件名
173 =2 DWORD Size; //文件大小
174 =2 DWORD FirstCluster; //第一个簇
175 =2 DWORD LastCluster; //最近一次读到的簇号
176 =2 DWORD ClusSecCnt; //当前簇扇区计数
177 =2 DWORD ByteCnt; //当前字节计数
178 =2 };
179 =2
180 =2 struct FATStr
181 =2 {
182 =2 DWORD Sector;
183 =2 DWORD FAT[128];
184 =2 };
185 =2
186 =2 #ifndef _LIBRARY_DEFINE
=2 xdata BYTE DiskBuffer[512];
=2
=2 xdata struct sDPTStr sDPT[4];
=2 xdata struct FAT32Str FAT32;
=2 xdata struct FCBStr FCB[FAT32_MAX_FCB];
=2 xdata CHAR LongFileName[256];
=2 xdata struct FATStr FAT;
=2 xdata struct DPTStr *DPT; //分区表结构指针
=2 xdata struct BootSecStr *BOOTSEC; //引导扇区结构指针
=2 xdata struct FAT32FSInfoStr *FSI; //FAT32扩展信息
=2 xdata struct FAT32SDirStr *sDIR; //FAT目录结构指针
=2 xdata struct FAT32LDirStr *lDIR; //FAT目录结构指针
=2 #endif
200 =2 #endif
201 =2
202 =2 extern xdata BYTE DiskBuffer[512];
203 =2
204 =2 extern xdata struct sDPTStr sDPT[4];
205 =2 extern xdata struct FAT32Str FAT32;
206 =2 extern xdata struct FCBStr FCB[FAT32_MAX_FCB];
207 =2 extern xdata CHAR LongFileName[256];
208 =2 extern xdata struct FATStr FAT;
209 =2 extern xdata struct DPTStr *DPT; //分区表结构指针
210 =2 extern xdata struct BootSecStr *BOOTSEC; //引导扇区结构指针
211 =2 extern xdata struct FAT32FSInfoStr *FSI; //FAT32扩展信息
212 =2 extern xdata struct FAT32SDirStr *sDIR; //FAT目录结构指针
213 =2 extern xdata struct FAT32LDirStr *lDIR; //FAT目录结构指针
214 =2
215 =2 extern void FAT32Init(void);
216 =2 extern BYTE FAT32MountPartition(void);
217 =2 extern BYTE FAT32MountVolumeID(BYTE Partition);
218 =2 extern BYTE FAT32GetDirName(WORD SecNum);
219 =2 extern void FAT32GetPartLongName(struct FAT32LDirStr *ldp,CHAR *name);
220 =2 extern DWORD FAT32DiskSize(void);
221 =2 extern DWORD FAT32DiskFreeSize(void);
222 =2 extern BYTE FAT32FindDIREntry(CHAR *DirName);
223 =2 extern void FAT32ReadCluster(DWORD *Cluster);
224 =2 extern BYTE FAT32ChangeDirectory(CHAR *DirName);
225 =2 extern BYTE FAT32ListDirectory(void);
226 =2 extern DWORD FAT32NextCluster(DWORD CurrentCluster);
C51 COMPILER V8.08 FAT32MOUNTVOLUMEID 06/01/2008 16:21:00 PAGE 11
227 =2 extern BYTE FAT32OpenFile(CHAR *filename);
228 =2 extern void FAT32CloseFile(BYTE fp);
229 =2 extern WORD FAT32ReadFile(BYTE fp);
11 =1
12 =1
3 #endif
4
5 BYTE FAT32MountVolumeID(BYTE Partition);
6
7 BYTE FAT32MountVolumeID(BYTE Partition)
8 {
9 1 register BYTE i;
10 1
11 1 #ifdef DEBUG
printf("Mount FAT32 volume ID...%bd\n",Partition);
#endif
14 1
15 1 if (Partition>=HDD.TotalPartitions) return(FAT32_ERR_PARTITION_NOT_FOUND); //没找到指定扇区
16 1
17 1 IDEReadSector(sDPT[Partition].LBABegin); //读FAT32 VolumeID扇区
18 1 //检查VolumeID扇区标记
19 1 if (DiskBuffer[510] != 0x55||DiskBuffer[511] != 0xaa)
20 1 return(FAT32_ERR_MBR_FLAG); //不正常的引导扇区标志
21 1
22 1 //检查分区类型
23 1 HDD.CurrentPartition = Partition; //当前分区号
24 1 // HDD.BytesPerSec = BOOTSEC->BPB_BytesPerSec; //每扇区字节数
25 1 FAT32.SecPerClus = BOOTSEC->BPB_SecPerClus; //每簇扇区数
26 1 FAT32.RsvdSecCnt = MEMSwap16(BOOTSEC->BPB_RsvdSecCnt); //保留扇区数
27 1 FAT32.NumFATs = BOOTSEC->BPB_NumFATs; //FAT表个数
28 1 FAT32.FATSz = MEMSwap32(BOOTSEC->FAT.F32.BPB_FATSz32); //FAT表达小（扇区）
29 1 FAT32.RootClus = MEMSwap32(BOOTSEC->FAT.F32.BPB_RootClus); //根目录簇号
30 1 FAT32.CurrentDirectory = FAT32.RootClus; //当前目录入口（簇号）
31 1 FAT32.FATSec = sDPT[HDD.CurrentPartition].LBABegin + FAT32.RsvdSecCnt; //FAT表开始的扇区号
32 1 FAT32.ClusSec = sDPT[HDD.CurrentPartition].LBABegin + FAT32.RsvdSecCnt + (FAT32.NumFATs * FAT32.FATSz);
-//簇开始的扇区
33 1 FAT32.FSISec = MEMSwap16(BOOTSEC->FAT.F32.BPB_FSInfo) + sDPT[Partition].LBABegin; //FAT32扩展信息扇区号
34 1
35 1 //加载第一个FAT表
36 1 IDEReadSector(FAT32.FATSec);
37 1 for(i=0;i<128;i++)
38 1 FAT.FAT[i]=((DWORD *)&DiskBuffer)[i];
39 1 FAT.Sector=0;
40 1 return(0);
41 1 }
C51 COMPILER V8.08 FAT32MOUNTVOLUMEID 06/01/2008 16:21:00 PAGE 12
ASSEMBLY LISTING OF GENERATED OBJECT CODE
; FUNCTION _FAT32MountVolumeID (BEGIN)
; SOURCE LINE # 7
0000 900000 R MOV DPTR,#Partition
0003 EF MOV A,R7
0004 F0 MOVX @DPTR,A
; SOURCE LINE # 8
; SOURCE LINE # 15
0005 900000 E MOV DPTR,#HDD
0008 E0 MOVX A,@DPTR
0009 FE MOV R6,A
000A EF MOV A,R7
000B C3 CLR C
000C 9E SUBB A,R6
000D 4003 JC ?C0001
000F 7F02 MOV R7,#02H
0011 22 RET
0012 ?C0001:
; SOURCE LINE # 17
0012 900000 R MOV DPTR,#Partition
0015 E0 MOVX A,@DPTR
0016 75F009 MOV B,#09H
0019 A4 MUL AB
001A 2400 E ADD A,#LOW sDPT+01H
001C F582 MOV DPL,A
001E E4 CLR A
001F 3400 E ADDC A,#HIGH sDPT+01H
0021 F583 MOV DPH,A
0023 E0 MOVX A,@DPTR
0024 FC MOV R4,A
0025 A3 INC DPTR
0026 E0 MOVX A,@DPTR
0027 FD MOV R5,A
0028 A3 INC DPTR
0029 E0 MOVX A,@DPTR
002A FE MOV R6,A
002B A3 INC DPTR
002C E0 MOVX A,@DPTR
002D FF MOV R7,A
002E 900000 E MOV DPTR,#IDE+02H
0031 120000 E LCALL ?C?LSTXDATA
0034 120000 E LCALL _IDEReadSector
; SOURCE LINE # 19
0037 900000 E MOV DPTR,#DiskBuffer+01FEH
003A E0 MOVX A,@DPTR
003B B45506 CJNE A,#055H,?C0004
003E A3 INC DPTR
003F E0 MOVX A,@DPTR
0040 64AA XRL A,#0AAH
0042 6003 JZ ?C0003
0044 ?C0004:
; SOURCE LINE # 20
0044 7F01 MOV R7,#01H
0046 22 RET
0047 ?C0003:
; SOURCE LINE # 23
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