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/*
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "fmap.h"
static int is_fmap(uint8_t *ptr)
{
FmapHeader *fmap_header = (FmapHeader *)ptr;
if (0 != memcmp(ptr, FMAP_SIGNATURE, FMAP_SIGNATURE_SIZE))
return 0;
if (fmap_header->fmap_ver_major == FMAP_VER_MAJOR)
return 1;
fprintf(stderr, "Found FMAP, but major version is %u instead of %u\n",
fmap_header->fmap_ver_major, FMAP_VER_MAJOR);
return 0;
}
/* Find and point to the FMAP header within the buffer */
FmapHeader *fmap_find(uint8_t *ptr, size_t size)
{
ssize_t offset, align;
ssize_t lim = size - sizeof(FmapHeader);
if (lim >= 0 && is_fmap(ptr))
return (FmapHeader *)ptr;
/* Search large alignments before small ones to find "right" FMAP. */
for (align = FMAP_SEARCH_STRIDE; align <= lim; align *= 2);
for (; align >= FMAP_SEARCH_STRIDE; align /= 2)
for (offset = align; offset <= lim; offset += align * 2)
if (is_fmap(ptr + offset))
return (FmapHeader *)(ptr + offset);
return NULL;
}
/* Search for an area by name, return pointer to its beginning */
uint8_t *fmap_find_by_name(uint8_t *ptr, size_t size, FmapHeader *fmap,
const char *name, FmapAreaHeader **ah_ptr)
{
int i;
FmapAreaHeader *ah;
if (!fmap)
fmap = fmap_find(ptr, size);
if (!fmap)
return NULL;
ah = (FmapAreaHeader*)((void *)fmap + sizeof(FmapHeader));
for (i = 0; i < fmap->fmap_nareas; i++)
if (!strncmp(ah[i].area_name, name, FMAP_NAMELEN)) {
if (ah_ptr)
*ah_ptr = ah + i;
return ptr + ah[i].area_offset;
}
return NULL;
}
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