New patch to review for coreboot: util/cbfstool: Enable filling fmap regions with a given value

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17787

-gerrit

commit 9d65b9c9cfe8d18a4276f07e01373e901c3ffd4a
Author: Patrick Georgi 
Date:   Tue Dec 6 18:55:26 2016 +0100

util/cbfstool: Enable filling fmap regions with a given value

So far, cbfstool write, when used with the -u/-d options (to "fill
    upwards/downwards") left the parts of the region alone for which there
    was no new data to write.

When adding -i [0..255], these parts are overwritten with the given
    value.

BUG=chromium:595715
    BRANCH=none
    TEST=cbfstool write -u -i 0 ... does the right thing (fill the unused
    space with zeroes)

Change-Id: I1b1c0eeed2862bc9fe5f66caae93b08fe21f465c
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: baf378c5f2afdae9946600ef6ff07408a3668fe0
    Original-Change-Id: I3752f731f8e6592b1a390ab565aa56e6b7de6765
    Original-Signed-off-by: Patrick Georgi 
    Original-Reviewed-on: https://chromium-review.googlesource.com/417319
    Original-Commit-Ready: Patrick Georgi 
    Original-Tested-by: Patrick Georgi 
    Original-Reviewed-by: Stefan Reinauer 
---
 util/cbfstool/cbfstool.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/util/cbfstool/cbfstool.c b/util/cbfstool/cbfstool.c
index c823dc8..6f85302 100644
--- a/util/cbfstool/cbfstool.c
+++ b/util/cbfstool/cbfstool.c
@@ -90,6 +90,7 @@ static struct param {
    .hash = VB2_HASH_INVALID,
    .headeroffset = ~0,
    .region_name = SECTION_NAME_PRIMARY_CBFS,
+	.u64val = -1,
 };

static bool region_is_flashmap(const char *region)
@@ -980,8 +981,18 @@ static int cbfs_write(void)
    		buffer_delete(&new_content);
    		return 1;
    	}
-		WARN("Written area will abut %s of target region: any unused space will keep its current contents\n",
-				param.fill_partial_upward ? "bottom" : "top");
+		if (param.u64val == (uint64_t)-1) {
+			WARN("Written area will abut %s of target region: any unused space will keep its current contents\n",
+					param.fill_partial_upward ? "bottom" : "top");
+		} else if (param.u64val > 0xff) {
+			ERROR("given fill value (%x) is larger than a byte\n", (unsigned)(param.u64val & 0xff));
+			buffer_delete(&new_content);
+			return 1;
+		} else {
+			memset(buffer_get(param.image_region),
+				param.u64val & 0xff,
+				buffer_size(param.image_region));
+		}
    	if (param.fill_partial_downward)
    		offset = param.image_region->size - new_content.size;
    }
@@ -1089,7 +1100,7 @@ static const struct command commands[] = {
    {"read", "r:f:vh?", cbfs_read, true, false},
    {"remove", "H:r:n:vh?", cbfs_remove, true, true},
    {"update-fit", "H:r:n:x:vh?", cbfs_update_fit, true, true},
-	{"write", "r:f:Fudvh?", cbfs_write, true, true},
+	{"write", "r:f:i:Fudvh?", cbfs_write, true, true},
 };

static struct option long_options[] = {
@@ -1235,7 +1246,7 @@ static void usage(char *name)
    		"Show the contents of the ROM\n"
         " extract [-r image,regions] [-m ARCH] -n NAME -f FILE        "
    		"Extracts a raw payload from ROM\n"
-	     " write [-F] -r image,regions -f file [-u | -d]               "
+	     " write [-F] -r image,regions -f file [-u | -d] [-i int]      "
    		"Write file into same-size [or larger] raw region\n"
         " read [-r fmap-region] -f file                               "
    		"Extract raw region contents into binary file\n"