145 lines
5.3 KiB
C
145 lines
5.3 KiB
C
/*
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* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <arch_helpers.h>
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#include <console.h>
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#include <platform.h>
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#include <semihosting.h>
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#include <bl_common.h>
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#include <bl2.h>
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/*******************************************************************************
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* The only thing to do in BL2 is to load further images and pass control to
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* BL31. The memory occupied by BL2 will be reclaimed by BL3_x stages. BL2 runs
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* entirely in S-EL1. Since arm standard c libraries are not PIC, printf et al
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* are not available. We rely on assertions to signal error conditions
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******************************************************************************/
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void bl2_main(void)
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{
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meminfo *bl2_tzram_layout;
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meminfo *bl31_tzram_layout;
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el_change_info *ns_image_info;
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unsigned long bl31_base, el_status;
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unsigned int bl2_load, bl31_load, mode;
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/* Perform remaining generic architectural setup in S-El1 */
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bl2_arch_setup();
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/* Perform platform setup in BL1 */
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bl2_platform_setup();
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#if defined (__GNUC__)
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printf("BL2 Built : %s, %s\n\r", __TIME__, __DATE__);
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#endif
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/* Find out how much free trusted ram remains after BL2 load */
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bl2_tzram_layout = bl2_plat_sec_mem_layout();
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/*
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* Load BL31. BL1 tells BL2 whether it has been TOP or BOTTOM loaded.
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* To avoid fragmentation of trusted SRAM memory, BL31 is always
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* loaded opposite to BL2. This allows BL31 to reclaim BL2 memory
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* while maintaining its free space in one contiguous chunk.
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*/
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bl2_load = bl2_tzram_layout->attr & LOAD_MASK;
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assert((bl2_load == TOP_LOAD) || (bl2_load == BOT_LOAD));
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bl31_load = (bl2_load == TOP_LOAD) ? BOT_LOAD : TOP_LOAD;
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bl31_base = load_image(bl2_tzram_layout, BL31_IMAGE_NAME,
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bl31_load, BL31_BASE);
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/* Assert if it has not been possible to load BL31 */
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assert(bl31_base != 0);
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/*
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* Create a new layout of memory for BL31 as seen by BL2. This
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* will gobble up all the BL2 memory.
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*/
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bl31_tzram_layout = (meminfo *) get_el_change_mem_ptr();
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init_bl31_mem_layout(bl2_tzram_layout, bl31_tzram_layout, bl31_load);
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/*
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* BL2 also needs to tell BL31 where the non-trusted software image
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* has been loaded. Place this info right after the BL31 memory layout
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*/
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ns_image_info = (el_change_info *) ((unsigned char *) bl31_tzram_layout
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+ sizeof(meminfo));
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/*
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* Assume that the non-secure bootloader has already been
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* loaded to its platform-specific location.
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*/
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ns_image_info->entrypoint = plat_get_ns_image_entrypoint();
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/* Figure out what mode we enter the non-secure world in */
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el_status = read_id_aa64pfr0_el1() >> ID_AA64PFR0_EL2_SHIFT;
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el_status &= ID_AA64PFR0_ELX_MASK;
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if (el_status)
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mode = MODE_EL2;
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else
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mode = MODE_EL1;
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ns_image_info->spsr = make_spsr(mode, MODE_SP_ELX, MODE_RW_64);
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ns_image_info->security_state = NON_SECURE;
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flush_dcache_range((unsigned long) ns_image_info,
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sizeof(el_change_info));
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/*
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* Run BL31 via an SMC to BL1. Information on how to pass control to
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* the non-trusted software image will be passed to BL31 in x2.
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*/
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if (bl31_base)
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run_image(bl31_base,
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make_spsr(MODE_EL3, MODE_SP_ELX, MODE_RW_64),
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SECURE,
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bl31_tzram_layout,
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(void *) ns_image_info);
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/* There is no valid reason for run_image() to return */
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assert(0);
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}
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/*******************************************************************************
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* BL1 has this function to print the fact that BL2 has done its job and BL31 is
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* about to be loaded. Since BL2 re-uses BL1's exception table, it needs to
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* define this function as well.
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* TODO: Remove this function from BL2.
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******************************************************************************/
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void display_boot_progress(unsigned long entrypoint,
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unsigned long spsr,
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unsigned long mem_layout,
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unsigned long ns_image_info)
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{
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return;
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}
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