📄 fatmountpartition.lst
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131 =2 struct DPTStr //分区表结构
132 =2 {
133 =2 BYTE BootFlag;
134 =2 BYTE CHSBegin[3];
135 =2 BYTE TypeCode;
136 =2 BYTE CHSEnd[3];
137 =2 DWORD LBABegin;
138 =2 DWORD CntSec;
139 =2 };
140 =2
141 =2 struct sDPTStr //简化的分区表
142 =2 {
143 =2 BYTE FATType;
144 =2 DWORD LBABegin;
145 =2 DWORD CntSec;
146 =2 };
147 =2
148 =2 struct FAT32FSInfoStr //FAT32扩展信息结构
149 =2 {
150 =2 DWORD LeadSig;
151 =2 BYTE Reserved1[480];
152 =2 DWORD StrucSig;
153 =2 DWORD FreeCount;
154 =2 DWORD NxtFree;
155 =2 BYTE Reserved2[12];
156 =2 DWORD TrailSig;
157 =2 };
158 =2
159 =2 struct FATSDirStr //FAT目录结构 短文件名
160 =2 {
161 =2 CHAR Name[11];
162 =2 BYTE Attr;
163 =2 BYTE NTRes;
164 =2 BYTE CrtTimeTenth;
165 =2 WORD CrtTime;
166 =2 WORD CrtDate;
167 =2 WORD LstAccDate;
168 =2 WORD FstClusHI;
169 =2 WORD WrtTime;
170 =2 WORD WrtDate;
171 =2 WORD FstClusLO;
172 =2 DWORD FileSize;
173 =2 };
174 =2
175 =2 struct FATLDirStr //FAT目录结构 长文件名
176 =2 {
177 =2 BYTE Ord;
178 =2 BYTE Name1[10];
179 =2 BYTE Attr;
180 =2 BYTE Type;
181 =2 BYTE Chksum;
182 =2 BYTE Name2[12];
183 =2 WORD FstClusLO;
184 =2 BYTE Name3[4];
185 =2 };
186 =2
C51 COMPILER V6.23a FATMOUNTPARTITION 12/24/2004 00:11:38 PAGE 10
187 =2 struct FATStr //FAT参数表
188 =2 {
189 =2 // BYTE ClusSecCnt; //当前簇扇区计数
190 =2 DWORD CurrentDirectory; //当前目录入口（簇号）
191 =2 BYTE SecPerClus; //每簇扇区数 1 2 4 8 16 32 64 128
192 =2 DWORD RootClus; //根目录开始的簇
193 =2 BYTE RootSectors; //根目录占用的扇区数
194 =2 DWORD ClusSec; //簇开始的扇区
195 =2 DWORD FATSz; //FAT表大小（扇区）
196 =2 DWORD FATSec; //FAT表开始扇区
197 =2 DWORD FSISec; //FSI所在扇区
198 =2 DWORD FSIFreeCount; //空闲簇数
199 =2 DWORD FSINxtFree; //空闲簇搜索指针
200 =2 };
201 =2
202 =2 struct FCBStr
203 =2 {
204 =2 CHAR FileName[12]; //文件名
205 =2 DWORD Size; //文件大小
206 =2 DWORD FirstCluster; //第一个簇
207 =2 DWORD LastCluster; //最近一次读到的簇号
208 =2 DWORD ClusSecCnt; //当前簇扇区计数
209 =2 DWORD ByteCnt; //当前字节计数
210 =2 };
211 =2
212 =2 struct FATTableStr
213 =2 {
214 =2 DWORD Sector;
215 =2 union FATUin
216 =2 {
217 =2 DWORD F32[128];
218 =2 WORD F16[256];
219 =2 BYTE F12[512];
220 =2 }FAT;
221 =2 };
222 =2
223 =2 struct FATClusterStr
224 =2 {
225 =2 BYTE SecOffset; //扇区偏移量
226 =2 DWORD Sector; //扇区号
227 =2 DWORD Cluster; //簇号
228 =2 };
229 =2
230 =2 #ifndef _LIBRARY_DEFINE
=2 xdata BYTE DiskBuffer[512];
=2
=2 xdata struct StorageMediaStr StorageMedia;
=2 xdata struct sDPTStr sDPT[FAT_MAX_PARTITIONS];
=2 xdata struct FATStr FAT;
=2 xdata struct FCBStr FCB[FAT_MAX_FCB];
=2 xdata CHAR LongFileName[256];
=2 xdata struct FATTableStr FATTable;
=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 FATSDirStr *sDIR; //FAT目录结构指针
=2 xdata struct FATLDirStr *lDIR; //FAT目录结构指针
=2 #endif
245 =2 #endif
246 =2
247 =2 extern xdata BYTE DiskBuffer[512];
248 =2
C51 COMPILER V6.23a FATMOUNTPARTITION 12/24/2004 00:11:38 PAGE 11
249 =2 extern xdata struct StorageMediaStr StorageMedia;
250 =2 extern xdata struct sDPTStr sDPT[FAT_MAX_PARTITIONS];
251 =2 extern xdata struct FATStr FAT;
252 =2 extern xdata struct FCBStr FCB[FAT_MAX_FCB];
253 =2 extern xdata CHAR LongFileName[256];
254 =2 extern xdata struct FATTableStr FATTable;
255 =2 extern xdata struct DPTStr *DPT; //分区表结构指针
256 =2 extern xdata struct BootSecStr *BOOTSEC; //引导扇区结构指针
257 =2 extern xdata struct FAT32FSInfoStr *FSI; //FAT32扩展信息
258 =2 extern xdata struct FATSDirStr *sDIR; //FAT目录结构指针
259 =2 extern xdata struct FATLDirStr *lDIR; //FAT目录结构指针
260 =2
261 =2 extern void FATInit(void);
262 =2 extern BYTE FATSelectMedia(BYTE Media);
263 =2 extern BYTE FATFindPartitions(void);
264 =2 extern BYTE FATMountPartition(void);
265 =2 extern BYTE FATMountVolumeID(BYTE Partition);
266 =2 extern void FATGetPartLongName(struct FATLDirStr *ldp,CHAR *name);
267 =2 extern DWORD FATDiskSize(void);
268 =2 extern DWORD FATDiskFreeSize(void);
269 =2 extern BYTE FATFindDIREntry(CHAR *DirName);
270 =2 extern BYTE FAT32FindDIREntry(CHAR *DirName);
271 =2 extern BYTE FAT16FindDIREntry(CHAR *DirName);
272 =2 void FATReadCluster(struct FATClusterStr *Cluster,BYTE *Buffer);
273 =2 extern BYTE FATChangeDirectory(CHAR *DirName);
274 =2 extern BYTE FATListDirectory(void);
275 =2 extern BYTE FAT32ListDirectory(void);
276 =2 extern BYTE FAT16ListDirectory(void);
277 =2 extern void FATNextCluster(DWORD *CurrentCluster);
278 =2 extern BYTE FATGetDirName(WORD SecNum);
279 =2 extern BYTE FATOpenFile(CHAR *filename);
280 =2 extern void FATCloseFile(BYTE fp);
281 =2 extern WORD FATReadFile(BYTE fp);
282 =2
11 =1
3 #endif
4
5 BYTE FATMountPartition(void);
6
7 BYTE FATMountPartition(void)
8 {
9 1 register BYTE i,j=0;
10 1 xdata DWORD MasterExtLBA,ExtLBA;
11 1 bit Master=1,Ext=1;
12 1
13 1 MasterExtLBA=0x00000000;
14 1 ExtLBA=0x00000000;
15 1
16 1 while(Ext)
17 1 {
18 2 if (StorageMedia.ReadSector(ExtLBA,DiskBuffer)) {printf("I/O error");return(0);} //读MBR扇区
19 2 // IDEReadSector(ExtLBA,DiskBuffer);
20 2 Ext=0;
21 2 //检查MBR扇区标记
22 2 if (DiskBuffer[510] != 0x55||DiskBuffer[511] != 0xaa)
23 2 {printf("55AA\n"); return(0);} //不正常的引导扇区标志
24 2
25 2 //加载分区表
26 2 for(i=0;i<4;i++)
27 2 {
28 3 DPT[i].LBABegin=MEMSwap32(DPT[i].LBABegin);
29 3 DPT[i].CntSec=MEMSwap32(DPT[i].CntSec);
C51 COMPILER V6.23a FATMOUNTPARTITION 12/24/2004 00:11:38 PAGE 12
30 3 if (DPT[i].TypeCode==0x01||
31 3 DPT[i].TypeCode==0x04||
32 3 DPT[i].TypeCode==0x06||
33 3 DPT[i].TypeCode==0x0b||
34 3 DPT[i].TypeCode==0x0c||
35 3 DPT[i].TypeCode==0x0e) //FAT 分区
36 3 {
37 4 sDPT[j].LBABegin = DPT[i].LBABegin + ExtLBA;
38 4 sDPT[j].CntSec = DPT[i].CntSec;
39 4 j++;
40 4 if (j==FAT_MAX_PARTITIONS) return(j);
41 4 }
42 3 else if (DPT[i].TypeCode==0x05||DPT[i].TypeCode==0x0f) //扩展分区
43 3 {
44 4 Ext=1;
45 4 if (Master)
46 4 {
47 5 ExtLBA=DPT[i].LBABegin;
48 5 MasterExtLBA=DPT[i].LBABegin;
49 5 Master=~Master;
50 5 }
51 4 else
52 4 {
53 5 ExtLBA=MasterExtLBA+DPT[i].LBABegin;
54 5 }
55 4 }
56 3 }
57 2 }
58 1 return(j);
59 1 }
C51 COMPILER V6.23a FATMOUNTPARTITION 12/24/2004 00:11:38 PAGE 13
ASSEMBLY LISTING OF GENERATED OBJECT CODE
; FUNCTION FATMountPartition (BEGIN)
; SOURCE LINE # 7
; SOURCE LINE # 8
; SOURCE LINE # 9
0000 E4 CLR A
0001 900000 R MOV DPTR,#j
0004 F0 MOVX @DPTR,A
; SOURCE LINE # 11
0005 D200 R SETB Master
0007 D200 R SETB Ext
; SOURCE LINE # 13
0009 A3 INC DPTR
000A 120000 E LCALL ?C?LSTKXDATA
000D 00 DB 00H
000E 00 DB 00H
000F 00 DB 00H
0010 00 DB 00H
; SOURCE LINE # 14
0011 900000 R MOV DPTR,#ExtLBA
0014 120000 E LCALL ?C?LSTKXDATA
0017 00 DB 00H
0018 00 DB 00H
0019 00 DB 00H
001A 00 DB 00H
001B ?C0001:
; SOURCE LINE # 16
001B 200003 R JB Ext,$ + 6H
001E 020000 R LJMP ?C0002
; SOURCE LINE # 17
; SOURCE LINE # 18
0021 900000 R MOV DPTR,#ExtLBA
0024 E0 MOVX A,@DPTR
0025 FC MOV R4,A
0026 A3 INC DPTR
0027 E0 MOVX A,@DPTR
0028 FD MOV R5,A
0029 A3 INC DPTR
002A E0 MOVX A,@DPTR
002B FE MOV R6,A
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