[new uImage] Cleanup image header pointer use in bootm code
- use single image header pointer instead of a set of auxilliary variables.
- add multi component image helper routines: get component size/data address
Signed-off-by: Marian Balakowicz <m8@semihalf.com>
diff --git a/common/image.c b/common/image.c
index 048b866..6eee83d 100644
--- a/common/image.c
+++ b/common/image.c
@@ -107,3 +107,89 @@
#endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
}
#endif /* USE_HOSTCC */
+
+/**
+ * image_multi_count - get component (sub-image) count
+ * @hdr: pointer to the header of the multi component image
+ *
+ * image_multi_count() returns number of components in a multi
+ * component image.
+ *
+ * Note: no checking of the image type is done, caller must pass
+ * a valid multi component image.
+ *
+ * returns:
+ * number of components
+ */
+ulong image_multi_count (image_header_t *hdr)
+{
+ ulong i, count = 0;
+ ulong *size;
+
+ /* get start of the image payload, which in case of multi
+ * component images that points to a table of component sizes */
+ size = (ulong *)image_get_data (hdr);
+
+ /* count non empty slots */
+ for (i = 0; size[i]; ++i)
+ count++;
+
+ return count;
+}
+
+/**
+ * image_multi_getimg - get component data address and size
+ * @hdr: pointer to the header of the multi component image
+ * @idx: index of the requested component
+ * @data: pointer to a ulong variable, will hold component data address
+ * @len: pointer to a ulong variable, will hold component size
+ *
+ * image_multi_getimg() returns size and data address for the requested
+ * component in a multi component image.
+ *
+ * Note: no checking of the image type is done, caller must pass
+ * a valid multi component image.
+ *
+ * returns:
+ * data address and size of the component, if idx is valid
+ * 0 in data and len, if idx is out of range
+ */
+void image_multi_getimg (image_header_t *hdr, ulong idx,
+ ulong *data, ulong *len)
+{
+ int i;
+ ulong *size;
+ ulong offset, tail, count, img_data;
+
+ /* get number of component */
+ count = image_multi_count (hdr);
+
+ /* get start of the image payload, which in case of multi
+ * component images that points to a table of component sizes */
+ size = (ulong *)image_get_data (hdr);
+
+ /* get address of the proper component data start, which means
+ * skipping sizes table (add 1 for last, null entry) */
+ img_data = image_get_data (hdr) + (count + 1) * sizeof (ulong);
+
+ if (idx < count) {
+ *len = size[idx];
+ offset = 0;
+ tail = 0;
+
+ /* go over all indices preceding requested component idx */
+ for (i = 0; i < idx; i++) {
+ /* add up i-th component size */
+ offset += size[i];
+
+ /* add up alignment for i-th component */
+ tail += (4 - size[i] % 4);
+ }
+
+ /* calculate idx-th component data address */
+ *data = img_data + offset + tail;
+ } else {
+ *len = 0;
+ *data = 0;
+ }
+}