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author | jhb <jhb@FreeBSD.org> | 2007-10-24 21:33:00 +0000 |
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committer | jhb <jhb@FreeBSD.org> | 2007-10-24 21:33:00 +0000 |
commit | 2f8a906c36edd256f39a8d2ef209fef1a548d79e (patch) | |
tree | 2e0ad7e3920a2c896b216cf32db1db922c1f0e29 /sys/geom/part/g_part_gpt.c | |
parent | 81c7dc737f4505dc976b462a40fdd5832e63a765 (diff) | |
download | FreeBSD-src-2f8a906c36edd256f39a8d2ef209fef1a548d79e.zip FreeBSD-src-2f8a906c36edd256f39a8d2ef209fef1a548d79e.tar.gz |
First cut at support for booting a GPT labeled disk via the BIOS bootstrap
on i386 and amd64 machines. The overall process is that /boot/pmbr lives
in the PMBR (similar to /boot/mbr for MBR disks) and is responsible for
locating and loading /boot/gptboot. /boot/gptboot is similar to /boot/boot
except that it groks GPT rather than MBR + bsdlabel. Unlike /boot/boot,
/boot/gptboot lives in its own dedicated GPT partition with a new
"FreeBSD boot" type. This partition does not have a fixed size in that
/boot/pmbr will load the entire partition into the lower 640k. However,
it is limited in that it can only be 545k. That's still a lot better than
the current 7.5k limit for boot2 on MBR. gptboot mostly acts just like
boot2 in that it reads /boot.config and loads up /boot/loader. Some more
details:
- Include uuid_equal() and uuid_is_nil() in libstand.
- Add a new 'boot' command to gpt(8) which makes a GPT disk bootable using
/boot/pmbr and /boot/gptboot. Note that the disk must have some free
space for the boot partition.
- This required exposing the backend of the 'add' function as a
gpt_add_part() function to the rest of gpt(8). 'boot' uses this to
create a boot partition if needed.
- Don't cripple cgbase() in the UFS boot code for /boot/gptboot so that
it can handle a filesystem > 1.5 TB.
- /boot/gptboot has a simple loader (gptldr) that doesn't do any I/O
unlike boot1 since /boot/pmbr loads all of gptboot up front. The
C portion of gptboot (gptboot.c) has been repocopied from boot2.c.
The primary changes are to parse the GPT to find a root filesystem
and to use 64-bit disk addresses. Currently gptboot assumes that the
first UFS partition on the disk is the / filesystem, but this algorithm
will likely be improved in the future.
- Teach the biosdisk driver in /boot/loader to understand GPT tables.
GPT partitions are identified as 'disk0pX:' (e.g. disk0p2:) which is
similar to the /dev names the kernel uses (e.g. /dev/ad0p2).
- Add a new "freebsd-boot" alias to g_part() for the new boot UUID.
MFC after: 1 month
Discussed with: marcel (some things might still change, but am committing
what I have so far)
Diffstat (limited to 'sys/geom/part/g_part_gpt.c')
-rw-r--r-- | sys/geom/part/g_part_gpt.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/geom/part/g_part_gpt.c b/sys/geom/part/g_part_gpt.c index 140c91a..12d28b5 100644 --- a/sys/geom/part/g_part_gpt.c +++ b/sys/geom/part/g_part_gpt.c @@ -121,6 +121,7 @@ G_PART_SCHEME_DECLARE(g_part_gpt_scheme); static struct uuid gpt_uuid_efi = GPT_ENT_TYPE_EFI; static struct uuid gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD; +static struct uuid gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT; static struct uuid gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP; static struct uuid gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS; static struct uuid gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM; @@ -295,6 +296,11 @@ gpt_parse_type(const char *type, struct uuid *uuid) *uuid = gpt_uuid_freebsd; return (0); } + alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_BOOT); + if (!strcasecmp(type, alias)) { + *uuid = gpt_uuid_freebsd_boot; + return (0); + } alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP); if (!strcasecmp(type, alias)) { *uuid = gpt_uuid_freebsd_swap; @@ -600,6 +606,8 @@ g_part_gpt_type(struct g_part_table *basetable, struct g_part_entry *baseentry, return (g_part_alias_name(G_PART_ALIAS_EFI)); if (EQUUID(type, &gpt_uuid_freebsd)) return (g_part_alias_name(G_PART_ALIAS_FREEBSD)); + if (EQUUID(type, &gpt_uuid_freebsd_boot)) + return (g_part_alias_name(G_PART_ALIAS_FREEBSD_BOOT)); if (EQUUID(type, &gpt_uuid_freebsd_swap)) return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP)); if (EQUUID(type, &gpt_uuid_freebsd_ufs)) |