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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)
148 lines
5.1 KiB
C
148 lines
5.1 KiB
C
/*-
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* Copyright (c) 2006, 2007 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _GEOM_PART_H_
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#define _GEOM_PART_H_
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#define G_PART_TRACE(args) g_trace args
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#define G_PART_PROBE_PRI_LOW -10
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#define G_PART_PROBE_PRI_NORM -5
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#define G_PART_PROBE_PRI_HIGH 0
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enum g_part_alias {
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G_PART_ALIAS_EFI, /* A EFI system partition entry. */
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G_PART_ALIAS_FREEBSD, /* A BSD labeled partition entry. */
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G_PART_ALIAS_FREEBSD_BOOT, /* A FreeBSD boot partition entry. */
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G_PART_ALIAS_FREEBSD_SWAP, /* A swap partition entry. */
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G_PART_ALIAS_FREEBSD_UFS, /* A UFS/UFS2 file system entry. */
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G_PART_ALIAS_FREEBSD_VINUM, /* A Vinum partition entry. */
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G_PART_ALIAS_FREEBSD_ZFS, /* A ZFS file system entry. */
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G_PART_ALIAS_MBR, /* A MBR (extended) partition entry. */
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/* Keep the following last */
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G_PART_ALIAS_COUNT
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};
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const char *g_part_alias_name(enum g_part_alias);
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/* G_PART scheme (KOBJ class). */
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struct g_part_scheme {
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KOBJ_CLASS_FIELDS;
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size_t gps_entrysz;
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int gps_minent;
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int gps_maxent;
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};
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#define G_PART_SCHEME_DECLARE(s) DATA_SET(g_part_scheme_set, s)
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struct g_part_entry {
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LIST_ENTRY(g_part_entry) gpe_entry;
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struct g_provider *gpe_pp; /* Corresponding provider. */
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off_t gpe_offset; /* Byte offset. */
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quad_t gpe_start; /* First LBA of partition. */
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quad_t gpe_end; /* Last LBA of partition. */
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int gpe_index;
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int gpe_created:1; /* Entry is newly created. */
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int gpe_deleted:1; /* Entry has been deleted. */
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int gpe_modified:1; /* Entry has been modified. */
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};
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/* G_PART table (KOBJ instance). */
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struct g_part_table {
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KOBJ_FIELDS;
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struct g_part_scheme *gpt_scheme;
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struct g_geom *gpt_gp;
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LIST_HEAD(, g_part_entry) gpt_entry;
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quad_t gpt_first; /* First allocatable LBA */
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quad_t gpt_last; /* Last allocatable LBA */
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int gpt_entries;
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/*
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* gpt_smhead and gpt_smtail are bitmaps representing the first
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* 32 sectors on the disk (gpt_smhead) and the last 32 sectors
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* on the disk (gpt_smtail). These maps are used by the commit
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* verb to clear sectors previously used by a scheme after the
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* partitioning scheme has been destroyed.
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*/
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uint32_t gpt_smhead;
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uint32_t gpt_smtail;
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/*
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* gpt_sectors and gpt_heads are the fixed or synchesized number
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* of sectors per track and heads (resp) that make up a disks
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* geometry. This is to support partitioning schemes as well as
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* file systems that work on a geometry. The MBR scheme and the
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* MS-DOS (FAT) file system come to mind.
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* We keep track of whether the geometry is fixed or synchesized
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* so that a partitioning scheme can correct the synthesized
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* geometry, based on the on-disk metadata.
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*/
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uint32_t gpt_sectors;
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uint32_t gpt_heads;
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int gpt_depth; /* Sub-partitioning level. */
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int gpt_isleaf:1; /* Cannot be sub-partitioned. */
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int gpt_created:1; /* Newly created. */
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int gpt_modified:1; /* Table changes have been made. */
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int gpt_opened:1; /* Permissions obtained. */
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int gpt_fixgeom:1; /* Geometry is fixed. */
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};
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struct g_part_entry *g_part_new_entry(struct g_part_table *, int, quad_t,
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quad_t);
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/* G_PART ctlreq parameters. */
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#define G_PART_PARM_ENTRIES 0x0001
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#define G_PART_PARM_FLAGS 0x0002
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#define G_PART_PARM_GEOM 0x0004
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#define G_PART_PARM_INDEX 0x0008
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#define G_PART_PARM_LABEL 0x0010
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#define G_PART_PARM_OUTPUT 0x0020
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#define G_PART_PARM_PROVIDER 0x0040
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#define G_PART_PARM_SCHEME 0x0080
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#define G_PART_PARM_SIZE 0x0100
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#define G_PART_PARM_START 0x0200
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#define G_PART_PARM_TYPE 0x0400
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#define G_PART_PARM_VERSION 0x0800
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struct g_part_parms {
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unsigned int gpp_parms;
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unsigned int gpp_entries;
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const char *gpp_flags;
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struct g_geom *gpp_geom;
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unsigned int gpp_index;
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const char *gpp_label;
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struct g_provider *gpp_provider;
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struct g_part_scheme *gpp_scheme;
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quad_t gpp_size;
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quad_t gpp_start;
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const char *gpp_type;
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unsigned int gpp_version;
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};
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void g_part_geometry_heads(off_t, u_int, off_t *, u_int *);
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#endif /* !_GEOM_PART_H_ */
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