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 if (boot->BytesPerSec % DOSBOOTBLOCKSIZE != 0) {
197 pfatal("Invalid sector size: %u", boot->BytesPerSec);
200 if (boot->SecPerClust == 0) {
201 pfatal("Invalid cluster size: %u", boot->SecPerClust);
204 if (boot->BytesPerSec == 0) {
205 pfatal("Invalid sector size: %u", boot->BytesPerSec);
208 if (boot->FATs == 0) {
209 pfatal("Invalid number of FATs: %u", boot->FATs);
212 if (boot->Sectors) {
213 boot->HugeSectors = 0;
214 boot->NumSectors = boot->Sectors;
216 boot->NumSectors = boot->HugeSectors;
218 boot->ClusterOffset = (boot->RootDirEnts * 32 + boot->BytesPerSec - 1)
219 / boot->BytesPerSec
220 + boot->ResSectors
221 + boot->FATs * boot->FATsecs
222 - CLUST_FIRST * boot->SecPerClust;
224 boot->NumClusters = (boot->NumSectors - boot->ClusterOffset) / boot->SecPerClust;
226 if (boot->flags&FAT32)
227 boot->ClustMask = CLUST32_MASK;
228 else if (boot->NumClusters < (CLUST_RSRVD&CLUST12_MASK))
229 boot->ClustMask = CLUST12_MASK;
230 else if (boot->NumClusters < (CLUST_RSRVD&CLUST16_MASK))
231 boot->ClustMask = CLUST16_MASK;
234 boot->NumClusters);
238 switch (boot->ClustMask) {
240 boot->NumFatEntries = (boot->FATsecs * boot->BytesPerSec) / 4;
243 boot->NumFatEntries = (boot->FATsecs * boot->BytesPerSec) / 2;
246 boot->NumFatEntries = (boot->FATsecs * boot->BytesPerSec * 2) / 3;
250 if (boot->NumFatEntries < boot->NumClusters) {
252 boot->NumClusters, boot->FATsecs);
255 boot->ClusterSize = boot->BytesPerSec * boot->SecPerClust;
257 boot->NumFiles = 1;
258 boot->NumFree = 0;
264 writefsinfo(dosfs, boot)
266 struct bootblock *boot;
270 if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
271 != boot->FSInfo * boot->BytesPerSec
276 fsinfo[0x1e8] = (u_char)boot->FSFree;
277 fsinfo[0x1e9] = (u_char)(boot->FSFree >> 8);
278 fsinfo[0x1ea] = (u_char)(boot->FSFree >> 16);
279 fsinfo[0x1eb] = (u_char)(boot->FSFree >> 24);
280 fsinfo[0x1ec] = (u_char)boot->FSNext;
281 fsinfo[0x1ed] = (u_char)(boot->FSNext >> 8);
282 fsinfo[0x1ee] = (u_char)(boot->FSNext >> 16);
283 fsinfo[0x1ef] = (u_char)(boot->FSNext >> 24);
284 if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
285 != boot->FSInfo * boot->BytesPerSec
