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 * 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_t *bl2_tzram_layout; 50 bl31_args_t *bl2_to_bl31_args; 51 unsigned long bl31_base, bl32_base = 0, bl33_base, el_status; 52 unsigned int bl2_load, bl31_load, mode; 53 54 /* Perform remaining generic architectural setup in S-El1 */ 55 bl2_arch_setup(); 56 57 /* Perform platform setup in BL1 */ 58 bl2_platform_setup(); 59 60 printf("BL2 %s\n\r", build_message); 61 62 /* Find out how much free trusted ram remains after BL2 load */ 63 bl2_tzram_layout = bl2_plat_sec_mem_layout(); 64 65 /* 66 * Load BL31. BL1 tells BL2 whether it has been TOP or BOTTOM loaded. 67 * To avoid fragmentation of trusted SRAM memory, BL31 is always 68 * loaded opposite to BL2. This allows BL31 to reclaim BL2 memory 69 * while maintaining its free space in one contiguous chunk. 70 */ 71 bl2_load = bl2_tzram_layout->attr & LOAD_MASK; 72 assert((bl2_load == TOP_LOAD) || (bl2_load == BOT_LOAD)); 73 bl31_load = (bl2_load == TOP_LOAD) ? BOT_LOAD : TOP_LOAD; 74 bl31_base = load_image(bl2_tzram_layout, BL31_IMAGE_NAME, 75 bl31_load, BL31_BASE); 76 77 /* Assert if it has not been possible to load BL31 */ 78 if (bl31_base == 0) { 79 ERROR("Failed to load BL3-1.\n"); 80 panic(); 81 } 82 83 /* 84 * Get a pointer to the memory the platform has set aside to pass 85 * information to BL31. 86 */ 87 bl2_to_bl31_args = bl2_get_bl31_args_ptr(); 88 89 /* 90 * Load the BL32 image if there's one. It is upto to platform 91 * to specify where BL32 should be loaded if it exists. It 92 * could create space in the secure sram or point to a 93 * completely different memory. A zero size indicates that the 94 * platform does not want to load a BL32 image. 95 */ 96 if (bl2_to_bl31_args->bl32_meminfo.total_size) 97 bl32_base = load_image(&bl2_to_bl31_args->bl32_meminfo, 98 BL32_IMAGE_NAME, 99 bl2_to_bl31_args->bl32_meminfo.attr & 100 LOAD_MASK, 101 BL32_BASE); 102 103 /* 104 * Create a new layout of memory for BL31 as seen by BL2. This 105 * will gobble up all the BL2 memory. 106 */ 107 init_bl31_mem_layout(bl2_tzram_layout, 108 &bl2_to_bl31_args->bl31_meminfo, 109 bl31_load); 110 111 /* Load the BL33 image in non-secure memory provided by the platform */ 112 bl33_base = load_image(&bl2_to_bl31_args->bl33_meminfo, 113 BL33_IMAGE_NAME, 114 BOT_LOAD, 115 plat_get_ns_image_entrypoint()); 116 /* Halt if failed to load normal world firmware. */ 117 if (bl33_base == 0) { 118 ERROR("Failed to load BL3-3.\n"); 119 panic(); 120 } 121 122 /* 123 * BL2 also needs to tell BL31 where the non-trusted software image 124 * is located. 125 */ 126 bl2_to_bl31_args->bl33_image_info.entrypoint = bl33_base; 127 128 /* Figure out what mode we enter the non-secure world in */ 129 el_status = read_id_aa64pfr0_el1() >> ID_AA64PFR0_EL2_SHIFT; 130 el_status &= ID_AA64PFR0_ELX_MASK; 131 132 if (el_status) 133 mode = MODE_EL2; 134 else 135 mode = MODE_EL1; 136 137 /* 138 * TODO: Consider the possibility of specifying the SPSR in 139 * the FIP ToC and allowing the platform to have a say as 140 * well. 141 */ 142 bl2_to_bl31_args->bl33_image_info.spsr = 143 make_spsr(mode, MODE_SP_ELX, MODE_RW_64); 144 bl2_to_bl31_args->bl33_image_info.security_state = NON_SECURE; 145 146 if (bl32_base) { 147 /* Fill BL32 image info */ 148 bl2_to_bl31_args->bl32_image_info.entrypoint = bl32_base; 149 bl2_to_bl31_args->bl32_image_info.security_state = SECURE; 150 151 /* 152 * The Secure Payload Dispatcher service is responsible for 153 * setting the SPSR prior to entry into the BL32 image. 154 */ 155 bl2_to_bl31_args->bl32_image_info.spsr = 0; 156 } 157 158 /* Flush the entire BL31 args buffer */ 159 flush_dcache_range((unsigned long) bl2_to_bl31_args, 160 sizeof(*bl2_to_bl31_args)); 161 162 /* 163 * Run BL31 via an SMC to BL1. Information on how to pass control to 164 * the BL32 (if present) and BL33 software images will be passed to 165 * BL31 as an argument. 166 */ 167 run_image(bl31_base, 168 make_spsr(MODE_EL3, MODE_SP_ELX, MODE_RW_64), 169 SECURE, 170 (void *) bl2_to_bl31_args, 171 NULL); 172 } 173