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 <arch.h> 32 #include <arch_helpers.h> 33 #include <assert.h> 34 #include <bl_common.h> 35 #include <bl2.h> 36 #include <debug.h> 37 #include <platform.h> 38 #include <stdio.h> 39 #include "bl2_private.h" 40 41 /******************************************************************************* 42 * Runs BL31 from the given entry point. It jumps to a higher exception level 43 * through an SMC. 44 ******************************************************************************/ 45 static void __dead2 bl2_run_bl31(entry_point_info_t *bl31_ep_info, 46 unsigned long arg1, 47 unsigned long arg2) 48 { 49 /* Set the args pointer */ 50 bl31_ep_info->args.arg0 = arg1; 51 bl31_ep_info->args.arg1 = arg2; 52 53 /* Flush the params to be passed to memory */ 54 bl2_plat_flush_bl31_params(); 55 56 smc(RUN_IMAGE, (unsigned long)bl31_ep_info, 0, 0, 0, 0, 0, 0); 57 } 58 59 60 /******************************************************************************* 61 * The only thing to do in BL2 is to load further images and pass control to 62 * BL31. The memory occupied by BL2 will be reclaimed by BL3_x stages. BL2 runs 63 * entirely in S-EL1. Since arm standard c libraries are not PIC, printf et al 64 * are not available. We rely on assertions to signal error conditions 65 ******************************************************************************/ 66 void bl2_main(void) 67 { 68 meminfo_t *bl2_tzram_layout; 69 bl31_params_t *bl2_to_bl31_params; 70 unsigned int bl2_load, bl31_load; 71 entry_point_info_t *bl31_ep_info; 72 meminfo_t bl32_mem_info; 73 meminfo_t bl33_mem_info; 74 int e; 75 76 /* Perform remaining generic architectural setup in S-El1 */ 77 bl2_arch_setup(); 78 79 /* Perform platform setup in BL1 */ 80 bl2_platform_setup(); 81 82 printf("BL2 %s\n\r", build_message); 83 84 /* Find out how much free trusted ram remains after BL2 load */ 85 bl2_tzram_layout = bl2_plat_sec_mem_layout(); 86 87 /* 88 * Get a pointer to the memory the platform has set aside to pass 89 * information to BL31. 90 */ 91 bl2_to_bl31_params = bl2_plat_get_bl31_params(); 92 bl31_ep_info = bl2_plat_get_bl31_ep_info(); 93 94 /* 95 * Load BL31. BL1 tells BL2 whether it has been TOP or BOTTOM loaded. 96 * To avoid fragmentation of trusted SRAM memory, BL31 is always 97 * loaded opposite to BL2. This allows BL31 to reclaim BL2 memory 98 * while maintaining its free space in one contiguous chunk. 99 */ 100 bl2_load = bl2_tzram_layout->attr & LOAD_MASK; 101 assert((bl2_load == TOP_LOAD) || (bl2_load == BOT_LOAD)); 102 bl31_load = (bl2_load == TOP_LOAD) ? BOT_LOAD : TOP_LOAD; 103 e = load_image(bl2_tzram_layout, 104 BL31_IMAGE_NAME, 105 bl31_load, 106 BL31_BASE, 107 bl2_to_bl31_params->bl31_image_info, 108 bl31_ep_info); 109 110 /* Assert if it has not been possible to load BL31 */ 111 if (e) { 112 ERROR("Failed to load BL3-1.\n"); 113 panic(); 114 } 115 116 bl2_plat_set_bl31_ep_info(bl2_to_bl31_params->bl31_image_info, 117 bl31_ep_info); 118 119 bl2_plat_get_bl33_meminfo(&bl33_mem_info); 120 121 /* Load the BL33 image in non-secure memory provided by the platform */ 122 e = load_image(&bl33_mem_info, 123 BL33_IMAGE_NAME, 124 BOT_LOAD, 125 plat_get_ns_image_entrypoint(), 126 bl2_to_bl31_params->bl33_image_info, 127 bl2_to_bl31_params->bl33_ep_info); 128 129 /* Halt if failed to load normal world firmware. */ 130 if (e) { 131 ERROR("Failed to load BL3-3.\n"); 132 panic(); 133 } 134 bl2_plat_set_bl33_ep_info(bl2_to_bl31_params->bl33_image_info, 135 bl2_to_bl31_params->bl33_ep_info); 136 137 138 #ifdef BL32_BASE 139 /* 140 * Load the BL32 image if there's one. It is upto to platform 141 * to specify where BL32 should be loaded if it exists. It 142 * could create space in the secure sram or point to a 143 * completely different memory. 144 * 145 * If a platform does not want to attempt to load BL3-2 image 146 * it must leave BL32_BASE undefined 147 */ 148 bl2_plat_get_bl32_meminfo(&bl32_mem_info); 149 e = load_image(&bl32_mem_info, 150 BL32_IMAGE_NAME, 151 bl32_mem_info.attr & LOAD_MASK, 152 BL32_BASE, 153 bl2_to_bl31_params->bl32_image_info, 154 bl2_to_bl31_params->bl32_ep_info); 155 156 /* Issue a diagnostic if no Secure Payload could be loaded */ 157 if (e) { 158 WARN("Failed to load BL3-2.\n"); 159 } else { 160 bl2_plat_set_bl32_ep_info( 161 bl2_to_bl31_params->bl32_image_info, 162 bl2_to_bl31_params->bl32_ep_info); 163 } 164 #endif /* BL32_BASE */ 165 166 /* 167 * Run BL31 via an SMC to BL1. Information on how to pass control to 168 * the BL32 (if present) and BL33 software images will be passed to 169 * BL31 as an argument. 170 */ 171 bl2_run_bl31(bl31_ep_info, (unsigned long)bl2_to_bl31_params, 0); 172 } 173