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 <bl31.h> 40 #include <runtime_svc.h> 41 #include <context_mgmt.h> 42 43 /******************************************************************************* 44 * Simple function to initialise all BL31 helper libraries. 45 ******************************************************************************/ 46 void bl31_lib_init() 47 { 48 cm_init(); 49 } 50 51 /******************************************************************************* 52 * BL31 is responsible for setting up the runtime services for the primary cpu 53 * before passing control to the bootloader (UEFI) or Linux. This function calls 54 * runtime_svc_init() which initializes all registered runtime services. The run 55 * time services would setup enough context for the core to swtich to the next 56 * exception level. When this function returns, the core will switch to the 57 * programmed exception level via. an ERET. 58 ******************************************************************************/ 59 void bl31_main(void) 60 { 61 el_change_info *next_image_info; 62 uint32_t scr; 63 64 /* Perform remaining generic architectural setup from EL3 */ 65 bl31_arch_setup(); 66 67 /* Perform platform setup in BL1 */ 68 bl31_platform_setup(); 69 70 #if defined (__GNUC__) 71 printf("BL31 Built : %s, %s\n\r", __TIME__, __DATE__); 72 #endif 73 /* Initialise helper libraries */ 74 bl31_lib_init(); 75 76 /* Initialize the runtime services e.g. psci */ 77 runtime_svc_init(); 78 79 /* Clean caches before re-entering normal world */ 80 dcsw_op_all(DCCSW); 81 82 /* 83 * Setup minimal architectural state of the next highest EL to 84 * allow execution in it immediately upon entering it. 85 */ 86 bl31_arch_next_el_setup(); 87 88 /* Program EL3 registers to enable entry into the next EL */ 89 next_image_info = bl31_get_next_image_info(); 90 scr = read_scr(); 91 if (next_image_info->security_state == NON_SECURE) 92 scr |= SCR_NS_BIT; 93 94 /* 95 * Tell the context mgmt. library to ensure that SP_EL3 points to 96 * the right context to exit from EL3 correctly. 97 */ 98 cm_set_el3_eret_context(next_image_info->security_state, 99 next_image_info->entrypoint, 100 next_image_info->spsr, 101 scr); 102 103 /* Finally set the next context */ 104 cm_set_next_eret_context(next_image_info->security_state); 105 } 106