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556ec4fd60
Firmware images reading its own FMAP structure may have FMAP signature in code and cause dump_fmap to parse incorrectly. Since currently there is only one major version for FMAP (and the structure defined in fmap.h also applies only to current version), we can improve that by checking major version number to skip signatures in firmware code. BUG=chromium:236347 TEST=emerge vboot_reference; dump_fmap /build/daisy/firmware/image.bin # success BRANCH=none Change-Id: I1d8f49bb88357e7a3a945fbdba9d9a7c4e177ac4 Reviewed-on: https://gerrit.chromium.org/gerrit/59362 Reviewed-by: Bill Richardson <wfrichar@chromium.org> Reviewed-by: David Hendricks <dhendrix@chromium.org> Tested-by: Hung-Te Lin <hungte@chromium.org> Commit-Queue: Gabe Black <gabeblack@chromium.org>
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef __FMAP_H__
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#define __FMAP_H__
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#include <inttypes.h>
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#include <stddef.h>
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/* FMAP structs. See http://code.google.com/p/flashmap/wiki/FmapSpec */
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#define FMAP_NAMELEN 32
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#define FMAP_SIGNATURE "__FMAP__"
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#define FMAP_SIGNATURE_SIZE 8
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#define FMAP_SEARCH_STRIDE 4
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#define FMAP_VER_MAJOR 1
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typedef struct _FmapHeader {
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char fmap_signature[FMAP_SIGNATURE_SIZE]; /* avoiding endian issues */
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uint8_t fmap_ver_major;
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uint8_t fmap_ver_minor;
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uint64_t fmap_base;
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uint32_t fmap_size;
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char fmap_name[FMAP_NAMELEN];
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uint16_t fmap_nareas;
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} __attribute__((packed)) FmapHeader;
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typedef struct _FmapAreaHeader {
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uint32_t area_offset;
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uint32_t area_size;
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char area_name[FMAP_NAMELEN];
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uint16_t area_flags;
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} __attribute__((packed)) FmapAreaHeader;
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/* Scan firmware image, pointed by [ptr] with length [size], for fmap header.
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* Return pointer to fmap header, or NULL if not found.
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*/
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const char* FmapFind(const char *ptr, size_t size);
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/* Look up fmap area by name, that is, strcmp(fh->fmap_name, name) == 0.
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* Return index of fmap area, that is, ah[returned_index],
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* or -1 if not found. */
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int FmapAreaIndex(const FmapHeader* fh, const FmapAreaHeader* ah,
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const char* name);
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#endif /* __FMAP_H__ */
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