Lines Matching full:boot
36 __RCSID("$NetBSD: boot.c,v 1.9 2003/07/24 19:25:46 ws Exp $");
38 "$FreeBSD: src/sbin/fsck_msdosfs/boot.c,v 1.4.28.1 2009/04/15 03:14:26 kensmith Exp $";
51 readboot(dosfs, boot)
53 struct bootblock *boot;
61 perror("could not read boot block");
66 pfatal("Invalid signature in boot block: %02x%02x", block[511], block[510]);
70 memset(boot, 0, sizeof *boot);
71 boot->ValidFat = -1;
74 boot->BytesPerSec = block[11] + (block[12] << 8);
75 boot->SecPerClust = block[13];
76 boot->ResSectors = block[14] + (block[15] << 8);
77 boot->FATs = block[16];
78 boot->RootDirEnts = block[17] + (block[18] << 8);
79 boot->Sectors = block[19] + (block[20] << 8);
80 boot->Media = block[21];
81 boot->FATsmall = block[22] + (block[23] << 8);
82 boot->SecPerTrack = block[24] + (block[25] << 8);
83 boot->Heads = block[26] + (block[27] << 8);
84 boot->HiddenSecs = block[28] + (block[29] << 8) + (block[30] << 16) + (block[31] << 24);
85 boot->HugeSectors = block[32] + (block[33] << 8) + (block[34] << 16) + (block[35] << 24);
87 boot->FATsecs = boot->FATsmall;
89 if (!boot->RootDirEnts)
90 boot->flags |= FAT32;
91 if (boot->flags & FAT32) {
92 boot->FATsecs = block[36] + (block[37] << 8)
95 boot->ValidFat = block[40] & 0x0f;
104 boot->RootCl = block[44] + (block[45] << 8)
106 boot->FSInfo = block[48] + (block[49] << 8);
107 boot->Backup = block[50] + (block[51] << 8);
109 if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
110 != boot->FSInfo * boot->BytesPerSec
136 if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
137 != boot->FSInfo * boot->BytesPerSec
145 boot->FSInfo = 0;
147 if (boot->FSInfo) {
148 boot->FSFree = fsinfo[0x1e8] + (fsinfo[0x1e9] << 8)
151 boot->FSNext = fsinfo[0x1ec] + (fsinfo[0x1ed] << 8)
156 if (lseek(dosfs, boot->Backup * boot->BytesPerSec, SEEK_SET)
157 != boot->Backup * boot->BytesPerSec
196 boot->ClusterOffset = (boot->RootDirEnts * 32 + boot->BytesPerSec - 1)
197 / boot->BytesPerSec
198 + boot->ResSectors
199 + boot->FATs * boot->FATsecs
200 - CLUST_FIRST * boot->SecPerClust;
202 if (boot->BytesPerSec % DOSBOOTBLOCKSIZE != 0) {
203 pfatal("Invalid sector size: %u", boot->BytesPerSec);
206 if (boot->SecPerClust == 0) {
207 pfatal("Invalid cluster size: %u", boot->SecPerClust);
210 if (boot->Sectors) {
211 boot->HugeSectors = 0;
212 boot->NumSectors = boot->Sectors;
214 boot->NumSectors = boot->HugeSectors;
215 boot->NumClusters = (boot->NumSectors - boot->ClusterOffset) / boot->SecPerClust;
217 if (boot->flags&FAT32)
218 boot->ClustMask = CLUST32_MASK;
219 else if (boot->NumClusters < (CLUST_RSRVD&CLUST12_MASK))
220 boot->ClustMask = CLUST12_MASK;
221 else if (boot->NumClusters < (CLUST_RSRVD&CLUST16_MASK))
222 boot->ClustMask = CLUST16_MASK;
225 boot->NumClusters);
229 switch (boot->ClustMask) {
231 boot->NumFatEntries = (boot->FATsecs * boot->BytesPerSec) / 4;
234 boot->NumFatEntries = (boot->FATsecs * boot->BytesPerSec) / 2;
237 boot->NumFatEntries = (boot->FATsecs * boot->BytesPerSec * 2) / 3;
241 if (boot->NumFatEntries < boot->NumClusters) {
243 boot->NumClusters, boot->FATsecs);
246 boot->ClusterSize = boot->BytesPerSec * boot->SecPerClust;
248 boot->NumFiles = 1;
249 boot->NumFree = 0;
255 writefsinfo(dosfs, boot)
257 struct bootblock *boot;
261 if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
262 != boot->FSInfo * boot->BytesPerSec
267 fsinfo[0x1e8] = (u_char)boot->FSFree;
268 fsinfo[0x1e9] = (u_char)(boot->FSFree >> 8);
269 fsinfo[0x1ea] = (u_char)(boot->FSFree >> 16);
270 fsinfo[0x1eb] = (u_char)(boot->FSFree >> 24);
271 fsinfo[0x1ec] = (u_char)boot->FSNext;
272 fsinfo[0x1ed] = (u_char)(boot->FSNext >> 8);
273 fsinfo[0x1ee] = (u_char)(boot->FSNext >> 16);
274 fsinfo[0x1ef] = (u_char)(boot->FSNext >> 24);
275 if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
276 != boot->FSInfo * boot->BytesPerSec
