1 /* 2 * Copyright (c) 2013, 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 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 bl2_tzram_layout, *bl31_tzram_layout; 50 el_change_info *ns_image_info; 51 unsigned long bl31_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 #if defined (__GNUC__) 61 printf("BL2 Built : %s, %s\n\r", __TIME__, __DATE__); 62 #endif 63 64 /* Find out how much free trusted ram remains after BL2 load */ 65 bl2_tzram_layout = bl2_get_sec_mem_layout(); 66 67 /* 68 * Load BL31. BL1 tells BL2 whether it has been TOP or BOTTOM loaded. 69 * To avoid fragmentation of trusted SRAM memory, BL31 is always 70 * loaded opposite to BL2. This allows BL31 to reclaim BL2 memory 71 * while maintaining its free space in one contiguous chunk. 72 */ 73 bl2_load = bl2_tzram_layout.attr & LOAD_MASK; 74 assert((bl2_load == TOP_LOAD) || (bl2_load == BOT_LOAD)); 75 bl31_load = (bl2_load == TOP_LOAD) ? BOT_LOAD : TOP_LOAD; 76 bl31_base = load_image(&bl2_tzram_layout, BL31_IMAGE_NAME, 77 bl31_load, BL31_BASE); 78 79 /* Assert if it has not been possible to load BL31 */ 80 assert(bl31_base != 0); 81 82 /* 83 * Create a new layout of memory for BL31 as seen by BL2. This 84 * will gobble up all the BL2 memory. 85 */ 86 bl31_tzram_layout = (meminfo *) get_el_change_mem_ptr(); 87 init_bl31_mem_layout(&bl2_tzram_layout, bl31_tzram_layout, bl31_load); 88 89 /* 90 * BL2 also needs to tell BL31 where the non-trusted software image 91 * has been loaded. Place this info right after the BL31 memory layout 92 */ 93 ns_image_info = (el_change_info *) ((unsigned char *) bl31_tzram_layout 94 + sizeof(meminfo)); 95 96 /* 97 * Assume that the non-secure bootloader has already been 98 * loaded to its platform-specific location. 99 */ 100 ns_image_info->entrypoint = plat_get_ns_image_entrypoint(); 101 102 /* Figure out what mode we enter the non-secure world in */ 103 el_status = read_id_aa64pfr0_el1() >> ID_AA64PFR0_EL2_SHIFT; 104 el_status &= ID_AA64PFR0_ELX_MASK; 105 106 if (el_status) 107 mode = MODE_EL2; 108 else 109 mode = MODE_EL1; 110 111 ns_image_info->spsr = make_spsr(mode, MODE_SP_ELX, MODE_RW_64); 112 ns_image_info->security_state = NON_SECURE; 113 flush_dcache_range((unsigned long) ns_image_info, 114 sizeof(el_change_info)); 115 116 /* 117 * Run BL31 via an SMC to BL1. Information on how to pass control to 118 * the non-trusted software image will be passed to BL31 in x2. 119 */ 120 if (bl31_base) 121 run_image(bl31_base, 122 make_spsr(MODE_EL3, MODE_SP_ELX, MODE_RW_64), 123 SECURE, 124 bl31_tzram_layout, 125 (void *) ns_image_info); 126 127 /* There is no valid reason for run_image() to return */ 128 assert(0); 129 } 130 131 /******************************************************************************* 132 * BL1 has this function to print the fact that BL2 has done its job and BL31 is 133 * about to be loaded. Since BL2 re-uses BL1's exception table, it needs to 134 * define this function as well. 135 * TODO: Remove this function from BL2. 136 ******************************************************************************/ 137 void display_boot_progress(unsigned long entrypoint, 138 unsigned long spsr, 139 unsigned long mem_layout, 140 unsigned long ns_image_info) 141 { 142 return; 143 } 144