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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)
90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*-
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* Copyright (c) 2002 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 _GPT_H_
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#define _GPT_H_
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#include <sys/endian.h>
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#include <sys/gpt.h>
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#include <uuid.h>
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void le_uuid_dec(void const *, uuid_t *);
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void le_uuid_enc(void *, uuid_t const *);
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int parse_uuid(const char *, uuid_t *);
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struct mbr_part {
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uint8_t part_flag; /* bootstrap flags */
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uint8_t part_shd; /* starting head */
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uint8_t part_ssect; /* starting sector */
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uint8_t part_scyl; /* starting cylinder */
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uint8_t part_typ; /* partition type */
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uint8_t part_ehd; /* end head */
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uint8_t part_esect; /* end sector */
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uint8_t part_ecyl; /* end cylinder */
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uint16_t part_start_lo; /* absolute starting ... */
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uint16_t part_start_hi; /* ... sector number */
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uint16_t part_size_lo; /* partition size ... */
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uint16_t part_size_hi; /* ... in sectors */
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};
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struct mbr {
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uint16_t mbr_code[223];
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struct mbr_part mbr_part[4];
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uint16_t mbr_sig;
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#define MBR_SIG 0xAA55
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};
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extern char *device_name;
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extern off_t mediasz;
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extern u_int parts;
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extern u_int secsz;
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extern int readonly, verbose;
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uint32_t crc32(const void *, size_t);
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map_t *gpt_add_part(int, uuid_t, off_t, off_t, unsigned int *);
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void gpt_close(int);
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int gpt_open(const char *);
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void* gpt_read(int, off_t, size_t);
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int gpt_write(int, map_t *);
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uint8_t *utf16_to_utf8(uint16_t *);
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void utf8_to_utf16(const uint8_t *, uint16_t *, size_t);
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int cmd_add(int, char *[]);
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int cmd_boot(int, char *[]);
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int cmd_create(int, char *[]);
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int cmd_destroy(int, char *[]);
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int cmd_label(int, char *[]);
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int cmd_migrate(int, char *[]);
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int cmd_recover(int, char *[]);
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int cmd_remove(int, char *[]);
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int cmd_show(int, char *[]);
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#endif /* _GPT_H_ */
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