Bug #310 » diskmbr-dd.diff
| sys/kern/subr_diskmbr.c Sat Nov 25 17:07:06 2006 +0000 → sys/kern/subr_diskmbr.c Sat Nov 25 20:02:05 2006 +0000 | ||
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*
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* from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
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* from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $
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* $FreeBSD: src/sys/kern/subr_diskmbr.c,v 1.45 2000/01/28 10:22:07 bde Exp $
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* $FreeBSD: src/sys/kern/subr_diskmbr.c,v 1.54 2001/12/11 05:35:43 peter Exp $
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* $DragonFly: src/sys/kern/subr_diskmbr.c,v 1.13 2006/04/30 17:22:17 dillon Exp $
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*/
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static volatile u_char dsi_debug;
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/*
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* This is what we have embedded in every boot1 for supporting the bogus
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* "Dangerously Dedicated" mode. However, the old table is broken because
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* it has an illegal geometry in it - it specifies 256 heads (heads = end
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* head + 1) which causes nasty stuff when that wraps to zero in bios code.
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* eg: divide by zero etc. This caused the dead-thinkpad problem, numerous
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* SCSI bios crashes, EFI to crash, etc.
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*
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* We still have to recognize the old table though, even though we stopped
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* inflicting it upon the world.
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*/
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static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
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};
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static struct dos_partition historical_bogus_partition_table_fixed[NDOSPART] = {
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0x80, 0, 1, 0, DOSPTYP_386BSD, 254, 255, 255, 0, 50000, },
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};
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static int check_part (char *sname, struct dos_partition *dp,
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* If ssector1 is on a cylinder >= 1024, then ssector can't be right.
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* Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
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* apart from the cylinder being reduced modulo 1024. Always allow
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* 1023/255/63.
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* 1023/255/63, because this is the official way to represent
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* pure-LBA for the starting position.
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*/
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if ((ssector < ssector1
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&& ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
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+ mbr_offset;
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esector1 = ssector1 + dp->dp_size - 1;
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/* Allow certain bogus C/H/S values for esector, as above. */
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/*
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* Allow certain bogus C/H/S values for esector, as above. However,
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* heads == 255 isn't really legal and causes some BIOS crashes. The
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* correct value to indicate a pure-LBA end is 1023/heads-1/sectors -
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* usually 1023/254/63. "heads" is base 0, "sectors" is base 1.
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*/
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if ((esector < esector1
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&& ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
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&& chs_ecyl == 1023)
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}
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if (bcmp(dp0, historical_bogus_partition_table,
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sizeof historical_bogus_partition_table) == 0) {
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sizeof historical_bogus_partition_table) == 0 ||
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bcmp(dp0, historical_bogus_partition_table_fixed,
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sizeof historical_bogus_partition_table_fixed) == 0) {
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#if 0
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TRACE(("%s: invalid primary partition table: historical\n",
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sname));
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#endif /* 0 */
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if (bootverbose)
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printf(
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"%s: invalid primary partition table: Dangerously Dedicated (ignored)\n",
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sname);
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error = EINVAL;
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goto done;
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}
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