arm-trusted-firmware/bl2/bl2_main.c

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/*
* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
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*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <arch.h>
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#include <arch_helpers.h>
#include <assert.h>
#include <auth_mod.h>
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#include <bl_common.h>
#include <debug.h>
#include <errno.h>
#include <platform.h>
#include <platform_def.h>
Use numbers to identify images instead of names The Trusted firmware code identifies BL images by name. The platform port defines a name for each image e.g. the IO framework uses this mechanism in the platform function plat_get_image_source(). For a given image name, it returns the handle to the image file which involves comparing images names. In addition, if the image is packaged in a FIP, a name comparison is required to find the UUID for the image. This method is not optimal. This patch changes the interface between the generic and platform code with regard to identifying images. The platform port must now allocate a unique number (ID) for every image. The generic code will use the image ID instead of the name to access its attributes. As a result, the plat_get_image_source() function now takes an image ID as an input parameter. The organisation of data structures within the IO framework has been rationalised to use an image ID as an index into an array which contains attributes of the image such as UUID and name. This prevents the name comparisons. A new type 'io_uuid_spec_t' has been introduced in the IO framework to specify images identified by UUID (i.e. when the image is contained in a FIP file). There is no longer need to maintain a look-up table [iname_name --> uuid] in the io_fip driver code. Because image names are no longer mandatory in the platform port, the debug messages in the generic code will show the image identifier instead of the file name. The platforms that support semihosting to load images (i.e. FVP) must provide the file names as definitions private to the platform. The ARM platform ports and documentation have been updated accordingly. All ARM platforms reuse the image IDs defined in the platform common code. These IDs will be used to access other attributes of an image in subsequent patches. IMPORTANT: applying this patch breaks compatibility for platforms that use TF BL1 or BL2 images or the image loading code. The platform port must be updated to match the new interface. Change-Id: I9c1b04cb1a0684c6ee65dee66146dd6731751ea5
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#include <stdint.h>
#include "bl2_private.h"
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/*******************************************************************************
* Load the BL3-0 image if there's one.
* If a platform does not want to attempt to load BL3-0 image it must leave
* BL30_BASE undefined.
* Return 0 on success or if there's no BL3-0 image to load, a negative error
* code otherwise.
******************************************************************************/
static int load_bl30(void)
{
int e = 0;
#ifdef BL30_BASE
meminfo_t bl30_mem_info;
image_info_t bl30_image_info;
/*
* It is up to the platform to specify where BL3-0 should be loaded if
* it exists. It could create space in the secure sram or point to a
* completely different memory.
*
* The entry point information is not relevant in this case as the AP
* won't execute the BL3-0 image.
*/
INFO("BL2: Loading BL3-0\n");
bl2_plat_get_bl30_meminfo(&bl30_mem_info);
bl30_image_info.h.version = VERSION_1;
e = load_auth_image(&bl30_mem_info,
BL30_IMAGE_ID,
BL30_BASE,
&bl30_image_info,
NULL);
if (e == 0) {
/* The subsequent handling of BL3-0 is platform specific */
e = bl2_plat_handle_bl30(&bl30_image_info);
if (e) {
ERROR("Failure in platform-specific handling of BL3-0 image.\n");
}
}
#endif /* BL30_BASE */
return e;
}
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/*******************************************************************************
* Load the BL3-1 image.
* The bl2_to_bl31_params and bl31_ep_info params will be updated with the
* relevant BL3-1 information.
* Return 0 on success, a negative error code otherwise.
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******************************************************************************/
static int load_bl31(bl31_params_t *bl2_to_bl31_params,
entry_point_info_t *bl31_ep_info)
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{
meminfo_t *bl2_tzram_layout;
int e;
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INFO("BL2: Loading BL3-1\n");
assert(bl2_to_bl31_params != NULL);
assert(bl31_ep_info != NULL);
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/* Find out how much free trusted ram remains after BL2 load */
bl2_tzram_layout = bl2_plat_sec_mem_layout();
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/* Set the X0 parameter to BL3-1 */
bl31_ep_info->args.arg0 = (unsigned long)bl2_to_bl31_params;
/* Load the BL3-1 image */
e = load_auth_image(bl2_tzram_layout,
BL31_IMAGE_ID,
BL31_BASE,
bl2_to_bl31_params->bl31_image_info,
bl31_ep_info);
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if (e == 0) {
bl2_plat_set_bl31_ep_info(bl2_to_bl31_params->bl31_image_info,
bl31_ep_info);
}
return e;
}
/*******************************************************************************
* Load the BL3-2 image if there's one.
* The bl2_to_bl31_params param will be updated with the relevant BL3-2
* information.
* If a platform does not want to attempt to load BL3-2 image it must leave
* BL32_BASE undefined.
* Return 0 on success or if there's no BL3-2 image to load, a negative error
* code otherwise.
******************************************************************************/
static int load_bl32(bl31_params_t *bl2_to_bl31_params)
{
int e = 0;
#ifdef BL32_BASE
meminfo_t bl32_mem_info;
INFO("BL2: Loading BL3-2\n");
assert(bl2_to_bl31_params != NULL);
/*
* It is up to the platform to specify where BL3-2 should be loaded if
* it exists. It could create space in the secure sram or point to a
* completely different memory.
*/
bl2_plat_get_bl32_meminfo(&bl32_mem_info);
e = load_auth_image(&bl32_mem_info,
BL32_IMAGE_ID,
BL32_BASE,
bl2_to_bl31_params->bl32_image_info,
bl2_to_bl31_params->bl32_ep_info);
if (e == 0) {
bl2_plat_set_bl32_ep_info(
bl2_to_bl31_params->bl32_image_info,
bl2_to_bl31_params->bl32_ep_info);
}
#endif /* BL32_BASE */
return e;
}
/*******************************************************************************
* Load the BL3-3 image.
* The bl2_to_bl31_params param will be updated with the relevant BL3-3
* information.
* Return 0 on success, a negative error code otherwise.
******************************************************************************/
static int load_bl33(bl31_params_t *bl2_to_bl31_params)
{
meminfo_t bl33_mem_info;
int e;
INFO("BL2: Loading BL3-3\n");
assert(bl2_to_bl31_params != NULL);
bl2_plat_get_bl33_meminfo(&bl33_mem_info);
/* Load the BL3-3 image in non-secure memory provided by the platform */
e = load_auth_image(&bl33_mem_info,
BL33_IMAGE_ID,
plat_get_ns_image_entrypoint(),
bl2_to_bl31_params->bl33_image_info,
bl2_to_bl31_params->bl33_ep_info);
if (e == 0) {
bl2_plat_set_bl33_ep_info(bl2_to_bl31_params->bl33_image_info,
bl2_to_bl31_params->bl33_ep_info);
}
return e;
}
/*******************************************************************************
* The only thing to do in BL2 is to load further images and pass control to
* BL3-1. The memory occupied by BL2 will be reclaimed by BL3-x stages. BL2 runs
* entirely in S-EL1.
******************************************************************************/
void bl2_main(void)
{
bl31_params_t *bl2_to_bl31_params;
entry_point_info_t *bl31_ep_info;
int e;
NOTICE("BL2: %s\n", version_string);
NOTICE("BL2: %s\n", build_message);
/* Perform remaining generic architectural setup in S-EL1 */
bl2_arch_setup();
#if TRUSTED_BOARD_BOOT
/* Initialize authentication module */
auth_mod_init();
#endif /* TRUSTED_BOARD_BOOT */
/*
* Load the subsequent bootloader images
*/
e = load_bl30();
if (e) {
ERROR("Failed to load BL3-0 (%i)\n", e);
plat_error_handler(e);
}
/* Perform platform setup in BL2 after loading BL3-0 */
bl2_platform_setup();
/*
* Get a pointer to the memory the platform has set aside to pass
* information to BL3-1.
*/
bl2_to_bl31_params = bl2_plat_get_bl31_params();
bl31_ep_info = bl2_plat_get_bl31_ep_info();
e = load_bl31(bl2_to_bl31_params, bl31_ep_info);
if (e) {
ERROR("Failed to load BL3-1 (%i)\n", e);
plat_error_handler(e);
}
e = load_bl32(bl2_to_bl31_params);
if (e) {
if (e == -EAUTH) {
ERROR("Failed to authenticate BL3-2\n");
plat_error_handler(e);
} else {
WARN("Failed to load BL3-2 (%i)\n", e);
}
}
e = load_bl33(bl2_to_bl31_params);
if (e) {
ERROR("Failed to load BL3-3 (%i)\n", e);
plat_error_handler(e);
}
/* Flush the params to be passed to memory */
bl2_plat_flush_bl31_params();
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/*
* Run BL3-1 via an SMC to BL1. Information on how to pass control to
* the BL3-2 (if present) and BL3-3 software images will be passed to
* BL3-1 as an argument.
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*/
smc(RUN_IMAGE, (unsigned long)bl31_ep_info, 0, 0, 0, 0, 0, 0);
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}