diff options
author | Achin Gupta <achin.gupta@arm.com> | 2013-10-25 09:08:21 +0100 |
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committer | James Morrissey <james.morrissey@arm.com> | 2013-10-25 09:37:16 +0100 |
commit | 4f6ad66ae9fcc8bcb3b0fcee10b7ab1ffcaf1a56 (patch) | |
tree | 475db5d74370cb62b02afab0900774955a59702f /bl2/bl2_main.c |
ARMv8 Trusted Firmware release v0.2
Diffstat (limited to 'bl2/bl2_main.c')
-rw-r--r-- | bl2/bl2_main.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/bl2/bl2_main.c b/bl2/bl2_main.c new file mode 100644 index 00000000..aae67b4f --- /dev/null +++ b/bl2/bl2_main.c @@ -0,0 +1,143 @@ +/* + * Copyright (c) 2013, ARM Limited. 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, *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_get_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); +} + +/******************************************************************************* + * BL1 has this function to print the fact that BL2 has done its job and BL31 is + * about to be loaded. Since BL2 re-uses BL1's exception table, it needs to + * define this function as well. + * TODO: Remove this function from BL2. + ******************************************************************************/ +void display_boot_progress(unsigned long entrypoint, + unsigned long spsr, + unsigned long mem_layout, + unsigned long ns_image_info) +{ + return; +} |