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 meminfo *bl31_tzram_layout; 52 meminfo *bl33_ns_layout; 53 el_change_info *ns_image_info; 54 unsigned long bl31_base, bl33_base, el_status; 55 unsigned int bl2_load, bl31_load, mode; 56 57 /* Perform remaining generic architectural setup in S-El1 */ 58 bl2_arch_setup(); 59 60 /* Perform platform setup in BL1 */ 61 bl2_platform_setup(); 62 63 #if defined (__GNUC__) 64 printf("BL2 Built : %s, %s\n\r", __TIME__, __DATE__); 65 #endif 66 67 /* Find out how much free trusted ram remains after BL2 load */ 68 bl2_tzram_layout = bl2_plat_sec_mem_layout(); 69 70 /* 71 * Load BL31. BL1 tells BL2 whether it has been TOP or BOTTOM loaded. 72 * To avoid fragmentation of trusted SRAM memory, BL31 is always 73 * loaded opposite to BL2. This allows BL31 to reclaim BL2 memory 74 * while maintaining its free space in one contiguous chunk. 75 */ 76 bl2_load = bl2_tzram_layout->attr & LOAD_MASK; 77 assert((bl2_load == TOP_LOAD) || (bl2_load == BOT_LOAD)); 78 bl31_load = (bl2_load == TOP_LOAD) ? BOT_LOAD : TOP_LOAD; 79 bl31_base = load_image(bl2_tzram_layout, BL31_IMAGE_NAME, 80 bl31_load, BL31_BASE); 81 82 /* Assert if it has not been possible to load BL31 */ 83 assert(bl31_base != 0); 84 85 /* 86 * Create a new layout of memory for BL31 as seen by BL2. This 87 * will gobble up all the BL2 memory. 88 */ 89 bl31_tzram_layout = (meminfo *) get_el_change_mem_ptr(); 90 init_bl31_mem_layout(bl2_tzram_layout, bl31_tzram_layout, bl31_load); 91 92 /* Find out where the BL3-3 normal world firmware should go. */ 93 bl33_ns_layout = bl2_get_ns_mem_layout(); 94 bl33_base = load_image(bl33_ns_layout, BL33_IMAGE_NAME, 95 BOT_LOAD, plat_get_ns_image_entrypoint()); 96 /* Halt if failed to load normal world firmware. */ 97 if (bl33_base == 0) { 98 ERROR("Failed to load BL3-3.\n"); 99 panic(); 100 } 101 102 /* 103 * BL2 also needs to tell BL31 where the non-trusted software image 104 * has been loaded. Place this info right after the BL31 memory layout 105 */ 106 ns_image_info = (el_change_info *) ((unsigned char *) bl31_tzram_layout 107 + sizeof(meminfo)); 108 ns_image_info->entrypoint = bl33_base; 109 110 /* Figure out what mode we enter the non-secure world in */ 111 el_status = read_id_aa64pfr0_el1() >> ID_AA64PFR0_EL2_SHIFT; 112 el_status &= ID_AA64PFR0_ELX_MASK; 113 114 if (el_status) 115 mode = MODE_EL2; 116 else 117 mode = MODE_EL1; 118 119 ns_image_info->spsr = make_spsr(mode, MODE_SP_ELX, MODE_RW_64); 120 ns_image_info->security_state = NON_SECURE; 121 flush_dcache_range((unsigned long) ns_image_info, 122 sizeof(el_change_info)); 123 124 /* 125 * Run BL31 via an SMC to BL1. Information on how to pass control to 126 * the non-trusted software image will be passed to BL31 in x2. 127 */ 128 if (bl31_base) 129 run_image(bl31_base, 130 make_spsr(MODE_EL3, MODE_SP_ELX, MODE_RW_64), 131 SECURE, 132 bl31_tzram_layout, 133 (void *) ns_image_info); 134 135 /* There is no valid reason for run_image() to return */ 136 assert(0); 137 } 138