Author: ae
Date: Mon Jun 27 10:42:06 2011
New Revision: 223587
URL: http://svn.freebsd.org/changeset/base/223587
Log:
MS Windows NT+ uses 4 bytes at offset 0x1b8 in the MBR to identify
disk drive. The boot0cfg(8) utility preserves these 4 bytes when is
writing bootcode to keep a multiboot ability.
Change gpart's bootcode method to keep DSN if it is not zero. Also
do not allow writing bootcode with size not equal to MBRSIZE.
PR: kern/157819
Tested by: Eir Nym
MFC after: 1 month
Modified:
head/sys/geom/part/g_part_mbr.c
head/sys/sys/diskmbr.h
Modified: head/sys/geom/part/g_part_mbr.c
==============================================================================
--- head/sys/geom/part/g_part_mbr.c Mon Jun 27 09:15:41 2011
(r223586)
+++ head/sys/geom/part/g_part_mbr.c Mon Jun 27 10:42:06 2011
(r223587)
@@ -237,14 +237,16 @@ static int
g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
{
struct g_part_mbr_table *table;
- size_t codesz;
+ uint32_t dsn;
+
+ if (gpp->gpp_codesize != MBRSIZE)
+ return (ENODEV);
- codesz = DOSPARTOFF;
table = (struct g_part_mbr_table *)basetable;
- bzero(table->mbr, codesz);
- codesz = MIN(codesz, gpp->gpp_codesize);
- if (codesz > 0)
- bcopy(gpp->gpp_codeptr, table->mbr, codesz);
+ dsn = *(uint32_t *)(table->mbr + DOSDSNOFF);
+ bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF);
+ if (dsn != 0)
+ *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn;
return (0);
}
Modified: head/sys/sys/diskmbr.h
==============================================================================
--- head/sys/sys/diskmbr.h Mon Jun 27 09:15:41 2011 (r223586)
+++ head/sys/sys/diskmbr.h Mon Jun 27 10:42:06 2011 (r223587)
@@ -36,6 +36,7 @@
#include <sys/ioccom.h>
#define DOSBBSECTOR 0 /* DOS boot block relative sector
number */
+#define DOSDSNOFF 440 /* WinNT/2K/XP Drive Serial Number
offset */
#define DOSPARTOFF 446
#define DOSPARTSIZE 16
#define NDOSPART 4
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