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Write embedding zone using Reed-Solomon.

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* Makefile.util.def (grub-setup): Add grub-core/lib/reed_solomon.c.
	* grub-core/Makefile.am (rs_decoder.S): New target.
	(kern/i386/pc/startup.S): Depend on rs_decoder.S.
	* grub-core/kern/i386/pc/startup.S (reed_solomon_redundancy): New field.
	(multiboot): Move to RS part.
	(post_reed_solomon): New label.
	(grub_boot_drive): Move to non-RS part since it's modified in memory
	on boot.
	Include rs_decoder.S.
	* grub-core/lib/reed_solomon.c: New file.
	* include/grub/offsets.h (GRUB_KERNEL_I386_PC_REED_SOLOMON_REDUNDANCY):
	New definition.
	(GRUB_KERNEL_I386_PC_MULTIBOOT_SIGNATURE): Removed.
	(GRUB_KERNEL_I386_PC_RAW_SIZE): Updated.
	(GRUB_KERNEL_I386_PC_NO_REED_SOLOMON_PART): New definition.
	* include/grub/partition.h (grub_partition_map): Change prototype of
	embed to allow returning additional sectors.
	* include/grub/reed_solomon.h: New file.
	* util/grub-setup.c (setup): Handle Reed-Solomon.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-09-29 21:33:38 +02:00
commit b65830fae1
11 changed files with 687 additions and 65 deletions
Download patch file Download diff file Expand all files Collapse all files

8
include/grub/offsets.h
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@ -34,11 +34,13 @@
/* The offset of GRUB_INSTALL_BSD_PART. */
#define GRUB_KERNEL_I386_PC_INSTALL_BSD_PART 0x18
/* The offset of multiboot signature. */
#define GRUB_KERNEL_I386_PC_MULTIBOOT_SIGNATURE 0x1c
/* Offset of reed_solomon_redundancy. */
#define GRUB_KERNEL_I386_PC_REED_SOLOMON_REDUNDANCY 0x1c
/* The size of the first region which won't be compressed. */
#define GRUB_KERNEL_I386_PC_RAW_SIZE 0x5D8
#define GRUB_KERNEL_I386_PC_RAW_SIZE 0xc90
#define GRUB_KERNEL_I386_PC_NO_REED_SOLOMON_PART 0x6f8
/* The offset of GRUB_PREFIX. */
#define GRUB_KERNEL_I386_PC_PREFIX GRUB_KERNEL_I386_PC_RAW_SIZE

5
include/grub/partition.h
View file

@ -48,8 +48,9 @@ struct grub_partition_map
const grub_partition_t partition));
#ifdef GRUB_UTIL
/* Determine sectors available for embedding. */
grub_err_t (*embed) (struct grub_disk *disk, unsigned int nsectors,
grub_embed_type_t embed_type, grub_disk_addr_t *sectors);
grub_err_t (*embed) (struct grub_disk *disk, unsigned int *nsectors,
grub_embed_type_t embed_type,
grub_disk_addr_t **sectors);
#endif
};
typedef struct grub_partition_map *grub_partition_map_t;

30
include/grub/reed_solomon.h Normal file
View file

@ -0,0 +1,30 @@
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2010 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GRUB_REED_SOLOMON_HEADER
#define GRUB_REED_SOLOMON_HEADER 1
void
grub_reed_solomon_add_redundancy (void *buffer, grub_size_t data_size,
grub_size_t redundancy);
void
grub_reed_solomon_recover (void *buffer, grub_size_t data_size,
grub_size_t redundancy);
#endif