86 writechs(Disk *disk, uchar *p, vlong lba)  in writechs()  argument
90 	s = lba % disk->s;  in writechs()
91 	h = (lba / disk->s) % disk->h;  in writechs()
92 	c = lba / (disk->s * disk->h);  in writechs()
96 		h = disk->h - 1;  in writechs()
97 		s = disk->s - 1;  in writechs()
106 wrtentry(Disk *disk, Tentry *tp, int type, u32int base, u32int lba, u32int end)  in wrtentry()  argument
110 	writechs(disk, &tp->starth, lba);  in wrtentry()
111 	writechs(disk, &tp->endh, end-1);  in wrtentry()
119 	Disk *disk;  in main()  local
142 	disk = opendisk(argv[0], 0, 0);  in main()
143 	if(disk == nil)  in main()
146 	if(disk->type == Tfloppy)  in main()
154 	if(disk->secsize != secsize)  in main()
156 			argv0, disk->secsize, secsize);  in main()
158 	buf = malloc(secsize*(disk->s+1));  in main()
159 	mbr = malloc(secsize*disk->s);  in main()
166 	if(seek(disk->fd, 0, 0) < 0)  in main()
168 	if(read(disk->fd, mbr, secsize) != secsize)  in main()
175 		memset(buf, 0, secsize*disk->s);  in main()
178 		if((nmbr = read(sysfd, buf, secsize*(disk->s+1))) < 0)  in main()
180 		if(nmbr > secsize*disk->s)  in main()
181 			fatal("master boot record too large %d > %d", nmbr, secsize*disk->s);  in main()
192 		wrtentry(disk, tp, Type9, 0, disk->s, disk->secs);  in main()
197 	if(seek(disk->wfd, 0, 0) < 0)  in main()
199 	if(write(disk->wfd, mbr, nmbr) != nmbr)  in main()