📄 fat.cod

📁 EP9315的BSP包(WINCE下的BSP,内有各种驱动的详细的代码)
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; Listing generated by Microsoft (R) Optimizing Compiler Version 12.20.9615 

	TTL	d:\wince420\platform\ep931x\eboot\.\fat.c
	CODE32

  00000			 AREA	 |.drectve|, DRECTVE
	DCB	"-defaultlib:coredll.lib "
	DCB	"-defaultlib:corelibc.lib "


  00000			 AREA	 |.data|, DATA
	 COMMON	|g_fileinfo|, 0x11

	 COMMON	|g_fatparms|, 0x18


  00000			 AREA	 |.rdata|, DATA, READONLY
|EdbgVendorIds| DCW 0x0
	DCW	0x0
	DCD	0x4033
	DCB	0x1
	DCB	"AD", 0x0
	DCW	0x1050
	DCW	0x940
	DCD	0x4005
	DCB	0x1
	DCB	"LS", 0x0
	DCW	0x1050
	DCW	0x940
	DCD	0x2078
	DCB	0x1
	DCB	"LS", 0x0
	DCW	0x10ec
	DCW	0x8029
	DCD	0xc0f0
	DCB	0x1
	DCB	"KS", 0x0
	DCW	0x10ec
	DCW	0x8129
	DCD	0x0
	DCB	0x4
	DCB	"RT", 0x0
	DCW	0x10ec
	DCW	0x8139
	DCD	0x900b
	DCB	0x4
	DCB	"RT", 0x0
	DCW	0x10ec
	DCW	0x8139
	DCD	0xd0c9
	DCB	0x4
	DCB	"RT", 0x0
	DCW	0x10ec
	DCW	0x8139
	DCD	0xe04c
	DCB	0x4
	DCB	"RT", 0x0
	DCW	0x1186
	DCW	0x1300
	DCD	0x50ba
	DCB	0x4
	DCB	"DL", 0x0
	DCW	0x100b
	DCW	0x20
	DCD	0xa0cc
	DCB	0x5
	DCB	"NG", 0x0
	DCW	0x10b7
	DCW	0x9050
	DCD	0x6008
	DCB	0x6
	DCB	"3C", 0x0
	DCW	0x10b7
	DCW	0x9200
	DCD	0x476
	DCB	0x6
	DCB	"3C", 0x0
	EXPORT	|init_fat|
; File d:\wince420\platform\ep931x\eboot\fat.c

  00000			 AREA	 |.text| { |init_fat| }, CODE, ARM, SELECTION=1 ; comdat noduplicate

  00000			 AREA	 |.pdata$$init_fat|, PDATA, SELECTION=5, ASSOC=|.text| { |init_fat| } ; comdat associative
|$T36684| DCD	|init_fat|
	DCD	0x40000200
; Function compile flags: /Ogsy

  00000			 AREA	 |.text| { |init_fat| }, CODE, ARM, SELECTION=1 ; comdat noduplicate

  00000		 |init_fat| PROC

; 83   : {

  00000		 |$M36682|

; 84   :     #if 0
; 85   :     UCHAR bsect[SECTOR_SIZE];
; 86   :     PPARTTE pptbl = NULL;
; 87   :     PBSECTHDR psecthdr = NULL;
; 88   :     UCHAR i = 0;
; 89   : 
; 90   :     // Locate and verify single active partition in MBR.
; 91   :     memset (&bsect[0], 0, SECTOR_SIZE);
; 92   :     if (read_sector(0, &bsect[0]))
; 93   :     {
; 94   :         RETAILMSG(1, (TEXT("ERROR: Couldn't read MBR.\r\n")));
; 95   :         return(-1);
; 96   :     }
; 97   : 
; 98   :     // TODO - look for more than one occurrance of active partition.
; 99   :     // Walk partition table looking for active partition
; 100  :     pptbl = (PPARTTE)((UCHAR *)&bsect[0] + SECTOR_SIZE - PARTSIG_SIZE - PARTTBL_SIZE);
; 101  :     for(i=0 ; i < MAX_PARTITIONS && pptbl->actvflg != PARTACTV_FLAG; i++)
; 102  :         ++pptbl;
; 103  : 
; 104  :     if (i == MAX_PARTITIONS)
; 105  :     {
; 106  :         RETAILMSG(1, (TEXT("ERROR: Didn't find an active partition.\r\n")));
; 107  :         return(-1);
; 108  :     }
; 109  : 
; 110  :     // Save FAT info for active boot partition
; 111  :     g_fatparms.apartlba = pptbl->slba;
; 112  :     g_fatparms.apartlen = pptbl->size;
; 113  : 
; 114  :     DEBUGMSG(ZONE_INFO, (TEXT("Active boot partition found (LBA=0x%x  Length=0x%x).\r\n"), g_fatparms.apartlba, g_fatparms.apartlen));
; 115  : 
; 116  :     // Compute and store root directory LBA - to do this, get the boot sector
; 117  :     // from the active partition, look at the disk parameter block contents
; 118  :     // to determine number of reserved and hidden sectors, then compute.
; 119  :     memset (&bsect[0], 0, SECTOR_SIZE);
; 120  :     if (read_sector(g_fatparms.apartlba, &bsect[0]))
; 121  :     {
; 122  :         RETAILMSG(1, (TEXT("ERROR: Couldn't load active boot sector.\r\n")));
; 123  :         return(-1);
; 124  :     }
; 125  :   
; 126  :     psecthdr = (PBSECTHDR)&bsect[0]; 
; 127  :     g_fatparms.rootdirlba = g_fatparms.apartlba + (psecthdr->numfats * psecthdr->sectspfat) + psecthdr->numrsvdsects;
; 128  :     g_fatparms.fatlba = g_fatparms.apartlba + psecthdr->numrsvdsects;
; 129  : 
; 130  :     DEBUGMSG(ZONE_INFO, (TEXT("Root dir location (LBA=0x%x)\r\n"), g_fatparms.rootdirlba));
; 131  :     DEBUGMSG(ZONE_INFO, (TEXT("  - Number of FATs = 0x%x\r\n"), psecthdr->numfats));
; 132  :     DEBUGMSG(ZONE_INFO, (TEXT("  - Number of Sectors Per FATs = 0x%x\r\n"), psecthdr->sectspfat));
; 133  :     DEBUGMSG(ZONE_INFO, (TEXT("  - Number of Hidden Sectors = 0x%x\r\n"), psecthdr->numhdnsects));
; 134  :     DEBUGMSG(ZONE_INFO, (TEXT("  - Number of Reserved Sectors = 0x%x\r\n"), psecthdr->numrsvdsects));
; 135  : 
; 136  : 
; 137  :     // Save data start LBA
; 138  :     g_fatparms.cluststlba = g_fatparms.rootdirlba + ((sizeof(DIRENTRY) * psecthdr->numrootentry) / psecthdr->bytespsect);
; 139  :     if ((sizeof(DIRENTRY) * psecthdr->numrootentry) % psecthdr->bytespsect)
; 140  :         ++g_fatparms.cluststlba;
; 141  : 
; 142  :     // Save number of sectors per cluster
; 143  :     g_fatparms.sectspclust = psecthdr->sectspclust;
; 144  :     g_fatparms.numrootentry = psecthdr->numrootentry;
; 145  :     #endif // 0
; 146  : 
; 147  :     return(0); 

  00000	e3a00000	 mov       r0, #0

; 148  : }

  00004	e12fff1e	 bx        lr
  00008		 |$M36683|

			 ENDP  ; |init_fat|

	EXPORT	|clust_to_lba|

  00000			 AREA	 |.text| { |clust_to_lba| }, CODE, ARM, SELECTION=1 ; comdat noduplicate

  00000			 AREA	 |.pdata$$clust_to_lba|, PDATA, SELECTION=5, ASSOC=|.text| { |clust_to_lba| } ; comdat associative
|$T36691| DCD	|clust_to_lba|
	DCD	0x40000200
; Function compile flags: /Ogsy

  00000			 AREA	 |.text| { |clust_to_lba| }, CODE, ARM, SELECTION=1 ; comdat noduplicate

  00000		 |clust_to_lba| PROC

; 152  : {

  00000		 |$M36689|

; 153  :     //return(g_fatparms.cluststlba + (clust - 2) * g_fatparms.sectspclust);
; 154  :     return 0;

  00000	e3a00000	 mov       r0, #0

; 155  : }

  00004	e12fff1e	 bx        lr
  00008		 |$M36690|

			 ENDP  ; |clust_to_lba|

	EXPORT	|file_read|

  00000			 AREA	 |.text| { |file_read| }, CODE, ARM, SELECTION=1 ; comdat noduplicate

  00000			 AREA	 |.pdata$$file_read|, PDATA, SELECTION=5, ASSOC=|.text| { |file_read| } ; comdat associative
|$T36698| DCD	|file_read|
	DCD	0x40000200
; Function compile flags: /Ogsy

  00000			 AREA	 |.text| { |file_read| }, CODE, ARM, SELECTION=1 ; comdat noduplicate

  00000		 |file_read| PROC

; 159  : {

  00000		 |$M36696|

; 160  :     #if 0
; 161  :     UCHAR *ptmp = pbuf;
; 162  :     ULONG bytestoread = len;
; 163  :     ULONG sectstoread = 0;
; 164  : 
; 165  :     // TODO - handle EOF mid-cluster.
; 166  :     while (bytestoread)
; 167  :     {
; 168  :         if (g_fileinfo.bytesreminsect == 0)	// Buffer isn't filled...
; 169  :         {
; 170  :             // EOF?
; 171  :             if (g_fileinfo.curclust >= 0xfff8 && g_fileinfo.curclust <= 0xffff)
; 172  :                 return(FAT_EOF);
; 173  : 
; 174  :             memset(&g_bsect[0], 0, SECTOR_SIZE);
; 175  :             if (read_sector(g_fileinfo.cursect, &g_bsect[0]))
; 176  :             {
; 177  :                 RETAILMSG(1, (TEXT("ERROR: Couldn't read data sector.\r\n")));
; 178  :                 return(-1);
; 179  :             }
; 180  : 
; 181  : 	        // jump to next cluster if we've read all the sectors in the current
; 182  :             g_fileinfo.sectreminclust--;
; 183  :             g_fileinfo.cursect++;
; 184  :             if (g_fileinfo.sectreminclust == 0)
; 185  :             {
; 186  :                 ++g_fileinfo.clusttlbofst;
; 187  :                 g_fileinfo.sectreminclust = g_fatparms.sectspclust;
; 188  :                 g_fileinfo.curclust = *((USHORT *)CLUST_LIST_START + g_fileinfo.clusttlbofst);
; 189  :                 g_fileinfo.cursect = clust_to_lba(g_fileinfo.curclust);
; 190  :             }
; 191  :             
; 192  :             g_fileinfo.bytesreminsect = SECTOR_SIZE;
; 193  :             g_fileinfo.byteofst = 0;
; 194  :         }
; 195  : 
; 196  :         // If data in read buffer has all the data the caller needs...
; 197  :         if (bytestoread <= g_fileinfo.bytesreminsect)
; 198  :         {
; 199  :             memcpy(ptmp, (UCHAR *)&g_bsect[g_fileinfo.byteofst], bytestoread);
; 200  :             g_fileinfo.bytesreminsect -= (USHORT)bytestoread;
; 201  : 	    g_fileinfo.byteofst += (USHORT)bytestoread;
; 202  :             return(0);
; 203  :         }
; 204  : 
; 205  :         // Caller wants more data than is in the global buffer - first
; 206  : 	    // deplete the global buffer contents
; 207  :         memcpy(ptmp, (UCHAR *)&g_bsect[g_fileinfo.byteofst], g_fileinfo.bytesreminsect);
; 208  : 	    bytestoread -= g_fileinfo.bytesreminsect;
; 209  : 	    ptmp += g_fileinfo.bytesreminsect;
; 210  : 	    g_fileinfo.bytesreminsect = 0;
; 211  : 
; 212  :         // If remaining bytes are less than a sector in size - don't need to
; 213  : 	    // optimize for multi-sector reads - do a partial sector read
; 214  : 	    if ((bytestoread / SECTOR_SIZE) == 0)
; 215  : 	        continue;
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