From c5fb47c389000c7a5189c0ad28a26bf50bf7e65c Mon Sep 17 00:00:00 2001 From: Juan Castillo Date: Mon, 19 Jan 2015 16:51:21 +0000 Subject: [PATCH] Skip reserving memory for non-executable and BL3-0 images This patch adds support to not reserve the memory where an image is loaded if the image is: 1. A non-executable image e.g. a certificate 2. An executable image which is not meant to run on the application CPU (e.g. BL3-0) Both types of images are characterized by a NULL entrypoint argument to the load_image() function. It is used to distinguish them from other type of images. Important: Use this feature carefully. The caller is responsible for providing a valid entrypoint while loading images which will execute on the application CPU to prevent a potential overwrite of the corresponding memory region. Change-Id: Ied482280d9db714c529ec12c33a6c1d918d77a4e --- common/bl_common.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/common/bl_common.c b/common/bl_common.c index 60f8b2f7..8c241ec4 100644 --- a/common/bl_common.c +++ b/common/bl_common.c @@ -275,9 +275,16 @@ int load_image(meminfo_t *mem_layout, * Update the memory usage info. * This is done after the actual loading so that it is not updated when * the load is unsuccessful. + * If the caller does not provide an entry point, bypass the memory + * reservation. */ - reserve_mem(&mem_layout->free_base, &mem_layout->free_size, - image_base, image_size); + if (entry_point_info != NULL) { + reserve_mem(&mem_layout->free_base, &mem_layout->free_size, + image_base, image_size); + } else { + INFO("Skip reserving memory: 0x%lx - 0x%lx\n", + image_base, image_base + image_size); + } image_data->image_base = image_base; image_data->image_size = image_size; -- 2.30.2