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authorPatrick Georgi <pgeorgi@google.com>2017-09-19 14:39:58 +0200
committerPatrick Georgi <pgeorgi@google.com>2017-09-20 13:45:00 +0000
commit5d982d72be849a15f98bb0583b25bbcd6eb7d315 (patch)
tree5b0bc89e9b444d5fc295a9f6e275cdcf7618bffc /util/cbfstool/cbfs_image.c
parentbea2d75f3174a8fbd24be2010977f975e7a16720 (diff)
downloadcoreboot-5d982d72be849a15f98bb0583b25bbcd6eb7d315.tar.xz
util/cbfstool: Add "expand" command to make CBFS span an fmap region
vboot images come with multiple regions carrying CBFS file systems. To expedite hashing (from slow flash memory), the FW_MAIN_* regions are truncated since they typically have pretty large unused space at the end that is of no interest. For test purposes it can be useful to re-engage that space, so add a command that creates a new empty file entry covering that area (except for the last 4 bytes for the master header pointer, as usual). BUG=b:65853903 BRANCH=none TEST=`cbfstool test.bin expand -r FW_MAIN_A` creates a new empty file of the expected size on a Chrome OS firmware image. Change-Id: I160c8529ce4bfcc28685166b6d9035ade4f6f1d1 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/21598 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'util/cbfstool/cbfs_image.c')
-rw-r--r--util/cbfstool/cbfs_image.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/util/cbfstool/cbfs_image.c b/util/cbfstool/cbfs_image.c
index 1f4b49a48d..92815f5f06 100644
--- a/util/cbfstool/cbfs_image.c
+++ b/util/cbfstool/cbfs_image.c
@@ -442,6 +442,44 @@ int cbfs_copy_instance(struct cbfs_image *image, struct buffer *dst)
return 0;
}
+int cbfs_expand_to_region(struct buffer *region)
+{
+ if (buffer_get(region) == NULL)
+ return 1;
+
+ struct cbfs_image image;
+ memset(&image, 0, sizeof(image));
+ if (cbfs_image_from_buffer(&image, region, 0)) {
+ ERROR("reading CBFS failed!\n");
+ return 1;
+ }
+
+ uint32_t region_sz = buffer_size(region);
+
+ struct cbfs_file *entry;
+ for (entry = buffer_get(region);
+ cbfs_is_valid_entry(&image, entry);
+ entry = cbfs_find_next_entry(&image, entry)) {
+ /* just iterate through */
+ }
+
+ /* entry now points to the first aligned address after the last valid
+ * file header. That's either outside the image or exactly the place
+ * where we need to create a new file.
+ */
+ int last_entry_size = region_sz - ((void *)entry - buffer_get(region))
+ - cbfs_calculate_file_header_size("") - sizeof(int32_t);
+
+ if (last_entry_size > 0) {
+ cbfs_create_empty_entry(entry, CBFS_COMPONENT_NULL,
+ last_entry_size, "");
+ /* If the last entry was an empty file, merge them. */
+ cbfs_walk(&image, cbfs_merge_empty_entry, NULL);
+ }
+
+ return 0;
+}
+
static size_t cbfs_file_entry_metadata_size(const struct cbfs_file *f)
{
return ntohl(f->offset);