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/*
* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
*
* 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>
#include <arch_helpers.h>
#include <assert.h>
#include <bl_common.h>
#include <debug.h>
#include <platform.h>
#include <platform_def.h>
#include <stdio.h>
#include "bl2_private.h"
/*******************************************************************************
* Runs BL31 from the given entry point. It jumps to a higher exception level
* through an SMC.
******************************************************************************/
static void __dead2 bl2_run_bl31(entry_point_info_t *bl31_ep_info,
unsigned long arg1,
unsigned long arg2)
{
/* Set the args pointer */
bl31_ep_info->args.arg0 = arg1;
bl31_ep_info->args.arg1 = arg2;
/* Flush the params to be passed to memory */
bl2_plat_flush_bl31_params();
smc(RUN_IMAGE, (unsigned long)bl31_ep_info, 0, 0, 0, 0, 0, 0);
}
/*******************************************************************************
* The only thing to do in BL2 is to load further images and pass control to
* BL31. The memory occupied by BL2 will be reclaimed by BL3_x stages. BL2 runs
* entirely in S-EL1. Since arm standard c libraries are not PIC, printf et al
* are not available. We rely on assertions to signal error conditions
******************************************************************************/
void bl2_main(void)
{
meminfo_t *bl2_tzram_layout;
bl31_params_t *bl2_to_bl31_params;
unsigned int bl2_load, bl31_load;
entry_point_info_t *bl31_ep_info;
meminfo_t bl32_mem_info;
meminfo_t bl33_mem_info;
int e;
/* Perform remaining generic architectural setup in S-El1 */
bl2_arch_setup();
/* Perform platform setup in BL1 */
bl2_platform_setup();
printf("BL2 %s\n\r", build_message);
/* Find out how much free trusted ram remains after BL2 load */
bl2_tzram_layout = bl2_plat_sec_mem_layout();
/*
* Get a pointer to the memory the platform has set aside to pass
* information to BL31.
*/
bl2_to_bl31_params = bl2_plat_get_bl31_params();
bl31_ep_info = bl2_plat_get_bl31_ep_info();
/*
* Load BL31. BL1 tells BL2 whether it has been TOP or BOTTOM loaded.
* To avoid fragmentation of trusted SRAM memory, BL31 is always
* loaded opposite to BL2. This allows BL31 to reclaim BL2 memory
* while maintaining its free space in one contiguous chunk.
*/
bl2_load = bl2_tzram_layout->attr & LOAD_MASK;
assert((bl2_load == TOP_LOAD) || (bl2_load == BOT_LOAD));
bl31_load = (bl2_load == TOP_LOAD) ? BOT_LOAD : TOP_LOAD;
e = load_image(bl2_tzram_layout,
BL31_IMAGE_NAME,
bl31_load,
BL31_BASE,
bl2_to_bl31_params->bl31_image_info,
bl31_ep_info);
/* Assert if it has not been possible to load BL31 */
if (e) {
ERROR("Failed to load BL3-1.\n");
panic();
}
bl2_plat_set_bl31_ep_info(bl2_to_bl31_params->bl31_image_info,
bl31_ep_info);
bl2_plat_get_bl33_meminfo(&bl33_mem_info);
/* Load the BL33 image in non-secure memory provided by the platform */
e = load_image(&bl33_mem_info,
BL33_IMAGE_NAME,
BOT_LOAD,
plat_get_ns_image_entrypoint(),
bl2_to_bl31_params->bl33_image_info,
bl2_to_bl31_params->bl33_ep_info);
/* Halt if failed to load normal world firmware. */
if (e) {
ERROR("Failed to load BL3-3.\n");
panic();
}
bl2_plat_set_bl33_ep_info(bl2_to_bl31_params->bl33_image_info,
bl2_to_bl31_params->bl33_ep_info);
#ifdef BL32_BASE
/*
* Load the BL32 image if there's one. It is upto to platform
* to specify where BL32 should be loaded if it exists. It
* could create space in the secure sram or point to a
* completely different memory.
*
* If a platform does not want to attempt to load BL3-2 image
* it must leave BL32_BASE undefined
*/
bl2_plat_get_bl32_meminfo(&bl32_mem_info);
e = load_image(&bl32_mem_info,
BL32_IMAGE_NAME,
bl32_mem_info.attr & LOAD_MASK,
BL32_BASE,
bl2_to_bl31_params->bl32_image_info,
bl2_to_bl31_params->bl32_ep_info);
/* Issue a diagnostic if no Secure Payload could be loaded */
if (e) {
WARN("Failed to load BL3-2.\n");
} else {
bl2_plat_set_bl32_ep_info(
bl2_to_bl31_params->bl32_image_info,
bl2_to_bl31_params->bl32_ep_info);
}
#endif /* BL32_BASE */
/*
* Run BL31 via an SMC to BL1. Information on how to pass control to
* the BL32 (if present) and BL33 software images will be passed to
* BL31 as an argument.
*/
bl2_run_bl31(bl31_ep_info, (unsigned long)bl2_to_bl31_params, 0);
}