/* ARGSUSED */
int
Xedit(cmd_t *cmd, disk_t *disk, mbr_t *mbr, mbr_t *tt, int offset)
{
const char *errstr;
int pn, num, ret;
prt_t *pp;
pn = (int)strtonum(cmd->args, 0, 3, &errstr);
if (errstr) {
printf("partition number is %s: %s\n", errstr, cmd->args);
return (CMD_CONT);
}
pp = &mbr->part[pn];
/* Edit partition type */
ret = Xsetpid(cmd, disk, mbr, tt, offset);
#define EDIT(p, v, n, m) \
if ((num = ask_num(p, v, n, m)) != v) \
ret = CMD_DIRTY; \
v = num;
/* Unused, so just zero out */
if (pp->id == DOSPTYP_UNUSED) {
memset(pp, 0, sizeof(*pp));
printf("Partition %d is disabled.\n", pn);
return (ret);
}
/* Change table entry */
if (ask_yn("Do you wish to edit in CHS mode?")) {
int maxcyl, maxhead, maxsect;
/* Shorter */
maxcyl = disk->real->cylinders - 1;
maxhead = disk->real->heads - 1;
maxsect = disk->real->sectors;
/* Get data */
EDIT("BIOS Starting cylinder", pp->scyl, 0, maxcyl);
EDIT("BIOS Starting head", pp->shead, 0, maxhead);
EDIT("BIOS Starting sector", pp->ssect, 1, maxsect);
EDIT("BIOS Ending cylinder", pp->ecyl, 0, maxcyl);
EDIT("BIOS Ending head", pp->ehead, 0, maxhead);
EDIT("BIOS Ending sector", pp->esect, 1, maxsect);
/* Fix up off/size values */
PRT_fix_BN(disk, pp, pn);
/* Fix up CHS values for LBA */
PRT_fix_CHS(disk, pp);
} else {
pp->bs = getuint(disk, "Partition offset", pp->bs,
disk->real->size);
pp->ns = getuint(disk, "Partition size", pp->ns,
disk->real->size - pp->bs);
/* Fix up CHS values */
PRT_fix_CHS(disk, pp);
}
#undef EDIT
return (ret);
}
void
MBR_init(struct disk *disk, struct mbr *mbr)
{
daddr_t i;
u_int64_t adj;
/* Fix up given mbr for this disk */
mbr->part[0].flag = 0;
mbr->part[1].flag = 0;
mbr->part[2].flag = 0;
mbr->part[3].flag = DOSACTIVE;
mbr->signature = DOSMBR_SIGNATURE;
/* Use whole disk. Reserve first track, or first cyl, if possible. */
mbr->part[3].id = DOSPTYP_OPENBSD;
if (disk->real->heads > 1)
mbr->part[3].shead = 1;
else
mbr->part[3].shead = 0;
if (disk->real->heads < 2 && disk->real->cylinders > 1)
mbr->part[3].scyl = 1;
else
mbr->part[3].scyl = 0;
mbr->part[3].ssect = 1;
/* Go right to the end */
mbr->part[3].ecyl = disk->real->cylinders - 1;
mbr->part[3].ehead = disk->real->heads - 1;
mbr->part[3].esect = disk->real->sectors;
/* Fix up start/length fields */
PRT_fix_BN(disk, &mbr->part[3], 3);
#if defined(__powerpc__) || defined(__mips__)
/* Now fix up for the MS-DOS boot partition on PowerPC. */
mbr->part[0].flag = DOSACTIVE; /* Boot from dos part */
mbr->part[3].flag = 0;
mbr->part[3].ns += mbr->part[3].bs;
mbr->part[3].bs = mbr->part[0].bs + mbr->part[0].ns;
mbr->part[3].ns -= mbr->part[3].bs;
PRT_fix_CHS(disk, &mbr->part[3]);
if ((mbr->part[3].shead != 1) || (mbr->part[3].ssect != 1)) {
/* align the partition on a cylinder boundary */
mbr->part[3].shead = 0;
mbr->part[3].ssect = 1;
mbr->part[3].scyl += 1;
}
/* Fix up start/length fields */
PRT_fix_BN(disk, &mbr->part[3], 3);
#endif
/* Start OpenBSD MBR partition on a power of 2 block number. */
i = 1;
while (i < DL_SECTOBLK(&dl, mbr->part[3].bs))
i *= 2;
adj = DL_BLKTOSEC(&dl, i) - mbr->part[3].bs;
mbr->part[3].bs += adj;
mbr->part[3].ns -= adj;
PRT_fix_CHS(disk, &mbr->part[3]);
}
