Date: Sun, 21 Jul 2002 23:36:33 +0200 (CEST) From: Mark Kettenis <kettenis@chello.nl> To: timon@memphis.mephi.ru Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Booting FreeBSD from extended partitions Message-ID: <200207212136.g6LLaXBv079668@elgar.kettenis.dyndns.org> In-Reply-To: <20020721180623.A32258@memphis.mephi.ru> (timon@memphis.mephi.ru) References: <20020720174745.A33016@memphis.mephi.ru> <20020721020952.4e61aefc.brad@brad-x.com> <20020721180623.A32258@memphis.mephi.ru>
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From: "Artem 'Zazoobr' Ignatjev" <timon@memphis.mephi.ru>
Date: Sun, 21 Jul 2002 18:06:24 +0400
On Sun, Jul 21, 2002 at 02:09:52AM -0400, Brad Laue wrote:
>> I'm currently trying to make FreeBSD boot from extended
>> partitions (of course, with help of boot mgr - in my case that's WinNT
>> loader), and not without any progress: After patching /boot/loader to
>> understand EXT_X partition type, I'm able to boot from /dev/ad4s9.
>
> I'd be very interested in seeing your progress on this, and I think
> Simon 'corecode' Schultz would be as well - looking forward to it!
> Attach it to your reply.
Well, I don't think that all subcribers of this list wants to see this
staff, and don't know whether majordomo allows attaches in this list.
I will email it to you, and if anyone else is interested in this work,
I'd put it here: http://memphis.mephi.ru/~timon/
Sinceherely yours, Artem 'Zazoobr' Ignatjev.
In case you're wondering why you can't boot from /dev/ad4s10 and
above, take a look at the attached patch for vfs_conf.c. I also
included my version of a patch to fix the problems with extended
partitions in /boot/loader. I didn't look too closely at your code,
but my patch arranges things such that the slice numbers used by
/boot/loader match the slice numbers used by the kernel.
I didn't look at boot0 and boot1 since I'm using GRUB on my system.
Mark
PS The patches are against 4.6-STABLE from a week ago or so.
--- /usr/src/sys/boot/i386/libi386/biosdisk.c.orig Thu Dec 28 14:10:47 2000
+++ /usr/src/sys/boot/i386/libi386/biosdisk.c Sat Jul 13 03:30:53 2002
@@ -132,7 +132,8 @@ struct devsw biosdisk = {
static int bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev);
static void bd_closedisk(struct open_disk *od);
static int bd_bestslice(struct open_disk *od);
-static void bd_checkextended(struct open_disk *od, int slicenum);
+static void bd_checkextended(struct open_disk *od,
+ struct dos_partition *dp, u_int ext_base);
/*
* Translate between BIOS device numbers and our private unit numbers.
@@ -308,6 +309,7 @@ bd_printslice(struct open_disk *od, stru
break;
case 0x00: /* unused partition */
case DOSPTYP_EXT:
+ case 0x0f:
return;
case 0x01:
if (verbose)
@@ -512,7 +514,7 @@ bd_opendisk(struct open_disk **odp, stru
sizeof(struct dos_partition) * NDOSPART);
od->od_nslices = 4; /* extended slices start here */
for (i = 0; i < NDOSPART; i++)
- bd_checkextended(od, i);
+ bd_checkextended(od, &od->od_slicetab[i], od->od_slicetab[i].dp_start);
od->od_flags |= BD_PARTTABOK;
dptr = &od->od_slicetab[0];
@@ -624,22 +626,21 @@ bd_opendisk(struct open_disk **odp, stru
}
static void
-bd_checkextended(struct open_disk *od, int slicenum)
+bd_checkextended(struct open_disk *od, struct dos_partition *dp,
+ u_int ext_base)
{
- char buf[BIOSDISK_SECSIZE];
- struct dos_partition *dp;
+ char buf[BIOSDISK_SECSIZE];
u_int base;
- int i, start, end;
-
- dp = &od->od_slicetab[slicenum];
- start = od->od_nslices;
+ int i;
if (dp->dp_size == 0)
goto done;
- if (dp->dp_typ != DOSPTYP_EXT)
+ if (dp->dp_typ != DOSPTYP_EXT && dp->dp_typ != 0x0f)
goto done;
- if (bd_read(od, (daddr_t)dp->dp_start, 1, buf))
+ if (bd_read(od, (daddr_t)dp->dp_start, 1, buf)) {
+ DEBUG("error reading extended table");
goto done;
+ }
if (((u_char)buf[0x1fe] != 0x55) || ((u_char)buf[0x1ff] != 0xaa)) {
DEBUG("no magic in extended table");
goto done;
@@ -651,17 +652,17 @@ bd_checkextended(struct open_disk *od, i
continue;
if (od->od_nslices == MAX_SLICES)
goto done;
- dp->dp_start += base;
- bcopy(dp, &od->od_slicetab[od->od_nslices], sizeof(*dp));
- od->od_nslices++;
+ if (dp->dp_typ == DOSPTYP_EXT || dp->dp_typ == 0x0f) {
+ dp->dp_start += ext_base;
+ bd_checkextended(od, dp, ext_base);
+ } else {
+ dp->dp_start += base;
+ bcopy(dp, &od->od_slicetab[od->od_nslices],
+ sizeof(*dp));
+ od->od_nslices++;
+ }
}
- end = od->od_nslices;
- /*
- * now, recursively check the slices we just added
- */
- for (i = start; i < end; i++)
- bd_checkextended(od, i);
done:
return;
}
--- /usr/src/sys/kern/vfs_conf.c.orig Mon Feb 4 14:08:12 2002
+++ /usr/src/sys/kern/vfs_conf.c Fri Jul 12 17:34:02 2002
@@ -356,8 +356,10 @@ gotit:
while (*cp >= '0' && *cp <= '9')
unit = 10 * unit + *cp++ - '0';
if (*cp == 's' && cp[1] >= '0' && cp[1] <= '9') {
- slice = cp[1] - '0' + 1;
- cp += 2;
+ cp++;
+ while (*cp >= '0' && *cp <= '9')
+ slice = 10 * slice + *cp++ - '0';
+ slice++;
}
if (*cp >= 'a' && *cp <= 'h') {
part = *cp - 'a';
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