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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 <stdio.h>
#include <string.h>
#include <assert.h>
#include <arch_helpers.h>
#include <console.h>
#include <platform.h>
#include <semihosting.h>
#include <bl_common.h>
#include <bl2.h>
/*******************************************************************************
* 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 *bl2_tzram_layout;
meminfo *bl31_tzram_layout;
el_change_info *ns_image_info;
unsigned long bl31_base, el_status;
unsigned int bl2_load, bl31_load, mode;
/* Perform remaining generic architectural setup in S-El1 */
bl2_arch_setup();
/* Perform platform setup in BL1 */
bl2_platform_setup();
#if defined (__GNUC__)
printf("BL2 Built : %s, %s\n\r", __TIME__, __DATE__);
#endif
/* Find out how much free trusted ram remains after BL2 load */
bl2_tzram_layout = bl2_plat_sec_mem_layout();
/*
* 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;
bl31_base = load_image(bl2_tzram_layout, BL31_IMAGE_NAME,
bl31_load, BL31_BASE);
/* Assert if it has not been possible to load BL31 */
assert(bl31_base != 0);
/*
* Create a new layout of memory for BL31 as seen by BL2. This
* will gobble up all the BL2 memory.
*/
bl31_tzram_layout = (meminfo *) get_el_change_mem_ptr();
init_bl31_mem_layout(bl2_tzram_layout, bl31_tzram_layout, bl31_load);
/*
* BL2 also needs to tell BL31 where the non-trusted software image
* has been loaded. Place this info right after the BL31 memory layout
*/
ns_image_info = (el_change_info *) ((unsigned char *) bl31_tzram_layout
+ sizeof(meminfo));
/*
* Assume that the non-secure bootloader has already been
* loaded to its platform-specific location.
*/
ns_image_info->entrypoint = plat_get_ns_image_entrypoint();
/* Figure out what mode we enter the non-secure world in */
el_status = read_id_aa64pfr0_el1() >> ID_AA64PFR0_EL2_SHIFT;
el_status &= ID_AA64PFR0_ELX_MASK;
if (el_status)
mode = MODE_EL2;
else
mode = MODE_EL1;
ns_image_info->spsr = make_spsr(mode, MODE_SP_ELX, MODE_RW_64);
ns_image_info->security_state = NON_SECURE;
flush_dcache_range((unsigned long) ns_image_info,
sizeof(el_change_info));
/*
* Run BL31 via an SMC to BL1. Information on how to pass control to
* the non-trusted software image will be passed to BL31 in x2.
*/
if (bl31_base)
run_image(bl31_base,
make_spsr(MODE_EL3, MODE_SP_ELX, MODE_RW_64),
SECURE,
bl31_tzram_layout,
(void *) ns_image_info);
/* There is no valid reason for run_image() to return */
assert(0);
}
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