1 /* 2 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <stdio.h> 32 #include <string.h> 33 #include <assert.h> 34 #include <arch_helpers.h> 35 #include <console.h> 36 #include <platform.h> 37 #include <semihosting.h> 38 #include <bl_common.h> 39 #include <bl2.h> 40 41 /******************************************************************************* 42 * The only thing to do in BL2 is to load further images and pass control to 43 * BL31. The memory occupied by BL2 will be reclaimed by BL3_x stages. BL2 runs 44 * entirely in S-EL1. Since arm standard c libraries are not PIC, printf et al 45 * are not available. We rely on assertions to signal error conditions 46 ******************************************************************************/ 47 void bl2_main(void) 48 { 49 meminfo *bl2_tzram_layout; 50 meminfo *bl31_tzram_layout; 51 el_change_info *ns_image_info; 52 unsigned long bl31_base, el_status; 53 unsigned int bl2_load, bl31_load, mode; 54 55 /* Perform remaining generic architectural setup in S-El1 */ 56 bl2_arch_setup(); 57 58 /* Perform platform setup in BL1 */ 59 bl2_platform_setup(); 60 61 #if defined (__GNUC__) 62 printf("BL2 Built : %s, %s\n\r", __TIME__, __DATE__); 63 #endif 64 65 /* Find out how much free trusted ram remains after BL2 load */ 66 bl2_tzram_layout = bl2_plat_sec_mem_layout(); 67 68 /* 69 * Load BL31. BL1 tells BL2 whether it has been TOP or BOTTOM loaded. 70 * To avoid fragmentation of trusted SRAM memory, BL31 is always 71 * loaded opposite to BL2. This allows BL31 to reclaim BL2 memory 72 * while maintaining its free space in one contiguous chunk. 73 */ 74 bl2_load = bl2_tzram_layout->attr & LOAD_MASK; 75 assert((bl2_load == TOP_LOAD) || (bl2_load == BOT_LOAD)); 76 bl31_load = (bl2_load == TOP_LOAD) ? BOT_LOAD : TOP_LOAD; 77 bl31_base = load_image(bl2_tzram_layout, BL31_IMAGE_NAME, 78 bl31_load, BL31_BASE); 79 80 /* Assert if it has not been possible to load BL31 */ 81 assert(bl31_base != 0); 82 83 /* 84 * Create a new layout of memory for BL31 as seen by BL2. This 85 * will gobble up all the BL2 memory. 86 */ 87 bl31_tzram_layout = (meminfo *) get_el_change_mem_ptr(); 88 init_bl31_mem_layout(bl2_tzram_layout, bl31_tzram_layout, bl31_load); 89 90 /* 91 * BL2 also needs to tell BL31 where the non-trusted software image 92 * has been loaded. Place this info right after the BL31 memory layout 93 */ 94 ns_image_info = (el_change_info *) ((unsigned char *) bl31_tzram_layout 95 + sizeof(meminfo)); 96 97 /* 98 * Assume that the non-secure bootloader has already been 99 * loaded to its platform-specific location. 100 */ 101 ns_image_info->entrypoint = plat_get_ns_image_entrypoint(); 102 103 /* Figure out what mode we enter the non-secure world in */ 104 el_status = read_id_aa64pfr0_el1() >> ID_AA64PFR0_EL2_SHIFT; 105 el_status &= ID_AA64PFR0_ELX_MASK; 106 107 if (el_status) 108 mode = MODE_EL2; 109 else 110 mode = MODE_EL1; 111 112 ns_image_info->spsr = make_spsr(mode, MODE_SP_ELX, MODE_RW_64); 113 ns_image_info->security_state = NON_SECURE; 114 flush_dcache_range((unsigned long) ns_image_info, 115 sizeof(el_change_info)); 116 117 /* 118 * Run BL31 via an SMC to BL1. Information on how to pass control to 119 * the non-trusted software image will be passed to BL31 in x2. 120 */ 121 if (bl31_base) 122 run_image(bl31_base, 123 make_spsr(MODE_EL3, MODE_SP_ELX, MODE_RW_64), 124 SECURE, 125 bl31_tzram_layout, 126 (void *) ns_image_info); 127 128 /* There is no valid reason for run_image() to return */ 129 assert(0); 130 } 131