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 <platform_def.h> 39 #include <stdio.h> 40 #include "bl2_private.h" 41 42 /******************************************************************************* 43 * Runs BL31 from the given entry point. It jumps to a higher exception level 44 * through an SMC. 45 ******************************************************************************/ 46 static void __dead2 bl2_run_bl31(entry_point_info_t *bl31_ep_info, 47 unsigned long arg1, 48 unsigned long arg2) 49 { 50 /* Set the args pointer */ 51 bl31_ep_info->args.arg0 = arg1; 52 bl31_ep_info->args.arg1 = arg2; 53 54 /* Flush the params to be passed to memory */ 55 bl2_plat_flush_bl31_params(); 56 57 smc(RUN_IMAGE, (unsigned long)bl31_ep_info, 0, 0, 0, 0, 0, 0); 58 } 59 60 61 /******************************************************************************* 62 * The only thing to do in BL2 is to load further images and pass control to 63 * BL31. The memory occupied by BL2 will be reclaimed by BL3_x stages. BL2 runs 64 * entirely in S-EL1. Since arm standard c libraries are not PIC, printf et al 65 * are not available. We rely on assertions to signal error conditions 66 ******************************************************************************/ 67 void bl2_main(void) 68 { 69 meminfo_t *bl2_tzram_layout; 70 bl31_params_t *bl2_to_bl31_params; 71 unsigned int bl2_load, bl31_load; 72 entry_point_info_t *bl31_ep_info; 73 meminfo_t bl32_mem_info; 74 meminfo_t bl33_mem_info; 75 int e; 76 77 /* Perform remaining generic architectural setup in S-El1 */ 78 bl2_arch_setup(); 79 80 /* Perform platform setup in BL1 */ 81 bl2_platform_setup(); 82 83 printf("BL2 %s\n\r", build_message); 84 85 /* Find out how much free trusted ram remains after BL2 load */ 86 bl2_tzram_layout = bl2_plat_sec_mem_layout(); 87 88 /* 89 * Get a pointer to the memory the platform has set aside to pass 90 * information to BL31. 91 */ 92 bl2_to_bl31_params = bl2_plat_get_bl31_params(); 93 bl31_ep_info = bl2_plat_get_bl31_ep_info(); 94 95 /* 96 * Load BL31. BL1 tells BL2 whether it has been TOP or BOTTOM loaded. 97 * To avoid fragmentation of trusted SRAM memory, BL31 is always 98 * loaded opposite to BL2. This allows BL31 to reclaim BL2 memory 99 * while maintaining its free space in one contiguous chunk. 100 */ 101 bl2_load = bl2_tzram_layout->attr & LOAD_MASK; 102 assert((bl2_load == TOP_LOAD) || (bl2_load == BOT_LOAD)); 103 bl31_load = (bl2_load == TOP_LOAD) ? BOT_LOAD : TOP_LOAD; 104 e = load_image(bl2_tzram_layout, 105 BL31_IMAGE_NAME, 106 bl31_load, 107 BL31_BASE, 108 bl2_to_bl31_params->bl31_image_info, 109 bl31_ep_info); 110 111 /* Assert if it has not been possible to load BL31 */ 112 if (e) { 113 ERROR("Failed to load BL3-1.\n"); 114 panic(); 115 } 116 117 bl2_plat_set_bl31_ep_info(bl2_to_bl31_params->bl31_image_info, 118 bl31_ep_info); 119 120 bl2_plat_get_bl33_meminfo(&bl33_mem_info); 121 122 /* Load the BL33 image in non-secure memory provided by the platform */ 123 e = load_image(&bl33_mem_info, 124 BL33_IMAGE_NAME, 125 BOT_LOAD, 126 plat_get_ns_image_entrypoint(), 127 bl2_to_bl31_params->bl33_image_info, 128 bl2_to_bl31_params->bl33_ep_info); 129 130 /* Halt if failed to load normal world firmware. */ 131 if (e) { 132 ERROR("Failed to load BL3-3.\n"); 133 panic(); 134 } 135 bl2_plat_set_bl33_ep_info(bl2_to_bl31_params->bl33_image_info, 136 bl2_to_bl31_params->bl33_ep_info); 137 138 139 #ifdef BL32_BASE 140 /* 141 * Load the BL32 image if there's one. It is upto to platform 142 * to specify where BL32 should be loaded if it exists. It 143 * could create space in the secure sram or point to a 144 * completely different memory. 145 * 146 * If a platform does not want to attempt to load BL3-2 image 147 * it must leave BL32_BASE undefined 148 */ 149 bl2_plat_get_bl32_meminfo(&bl32_mem_info); 150 e = load_image(&bl32_mem_info, 151 BL32_IMAGE_NAME, 152 bl32_mem_info.attr & LOAD_MASK, 153 BL32_BASE, 154 bl2_to_bl31_params->bl32_image_info, 155 bl2_to_bl31_params->bl32_ep_info); 156 157 /* Issue a diagnostic if no Secure Payload could be loaded */ 158 if (e) { 159 WARN("Failed to load BL3-2.\n"); 160 } else { 161 bl2_plat_set_bl32_ep_info( 162 bl2_to_bl31_params->bl32_image_info, 163 bl2_to_bl31_params->bl32_ep_info); 164 } 165 #endif /* BL32_BASE */ 166 167 /* 168 * Run BL31 via an SMC to BL1. Information on how to pass control to 169 * the BL32 (if present) and BL33 software images will be passed to 170 * BL31 as an argument. 171 */ 172 bl2_run_bl31(bl31_ep_info, (unsigned long)bl2_to_bl31_params, 0); 173 } 174