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 #include "debug.h" 41 42 /******************************************************************************* 43 * The only thing to do in BL2 is to load further images and pass control to 44 * BL31. The memory occupied by BL2 will be reclaimed by BL3_x stages. BL2 runs 45 * entirely in S-EL1. Since arm standard c libraries are not PIC, printf et al 46 * are not available. We rely on assertions to signal error conditions 47 ******************************************************************************/ 48 void bl2_main(void) 49 { 50 meminfo *bl2_tzram_layout; 51 bl31_args *bl2_to_bl31_args; 52 unsigned long bl31_base, bl33_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 if (bl31_base == 0) { 82 ERROR("Failed to load BL3-1.\n"); 83 panic(); 84 } 85 86 /* 87 * Get a pointer to the memory the platform has set aside to pass 88 * information to BL31. 89 */ 90 bl2_to_bl31_args = bl2_get_bl31_args_ptr(); 91 92 /* 93 * Create a new layout of memory for BL31 as seen by BL2. This 94 * will gobble up all the BL2 memory. 95 */ 96 init_bl31_mem_layout(bl2_tzram_layout, 97 &bl2_to_bl31_args->bl31_meminfo, 98 bl31_load); 99 100 /* Load the BL33 image in non-secure memory provided by the platform */ 101 bl33_base = load_image(&bl2_to_bl31_args->bl33_meminfo, 102 BL33_IMAGE_NAME, 103 BOT_LOAD, 104 plat_get_ns_image_entrypoint()); 105 /* Halt if failed to load normal world firmware. */ 106 if (bl33_base == 0) { 107 ERROR("Failed to load BL3-3.\n"); 108 panic(); 109 } 110 111 /* 112 * BL2 also needs to tell BL31 where the non-trusted software image 113 * is located. 114 */ 115 bl2_to_bl31_args->bl33_image_info.entrypoint = bl33_base; 116 117 /* Figure out what mode we enter the non-secure world in */ 118 el_status = read_id_aa64pfr0_el1() >> ID_AA64PFR0_EL2_SHIFT; 119 el_status &= ID_AA64PFR0_ELX_MASK; 120 121 if (el_status) 122 mode = MODE_EL2; 123 else 124 mode = MODE_EL1; 125 126 /* 127 * TODO: Consider the possibility of specifying the SPSR in 128 * the FIP ToC and allowing the platform to have a say as 129 * well. 130 */ 131 bl2_to_bl31_args->bl33_image_info.spsr = 132 make_spsr(mode, MODE_SP_ELX, MODE_RW_64); 133 bl2_to_bl31_args->bl33_image_info.security_state = NON_SECURE; 134 135 /* Flush the entire BL31 args buffer */ 136 flush_dcache_range((unsigned long) bl2_to_bl31_args, 137 sizeof(*bl2_to_bl31_args)); 138 139 /* 140 * Run BL31 via an SMC to BL1. Information on how to pass control to 141 * the BL32 (if present) and BL33 software images will be passed to 142 * BL31 as an argument. 143 */ 144 run_image(bl31_base, 145 make_spsr(MODE_EL3, MODE_SP_ELX, MODE_RW_64), 146 SECURE, 147 (void *) bl2_to_bl31_args, 148 NULL); 149 } 150