1 /* 2 * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <arch.h> 8 #include <arch_helpers.h> 9 #include <assert.h> 10 #include <bl_common.h> 11 #include <bl31.h> 12 #include <console.h> 13 #include <context_mgmt.h> 14 #include <debug.h> 15 #include <platform.h> 16 #include <pmf.h> 17 #include <runtime_instr.h> 18 #include <runtime_svc.h> 19 #include <string.h> 20 21 #if ENABLE_RUNTIME_INSTRUMENTATION 22 PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID, 23 RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE) 24 #endif 25 26 /******************************************************************************* 27 * This function pointer is used to initialise the BL32 image. It's initialized 28 * by SPD calling bl31_register_bl32_init after setting up all things necessary 29 * for SP execution. In cases where both SPD and SP are absent, or when SPD 30 * finds it impossible to execute SP, this pointer is left as NULL 31 ******************************************************************************/ 32 static int32_t (*bl32_init)(void); 33 34 /******************************************************************************* 35 * Variable to indicate whether next image to execute after BL31 is BL33 36 * (non-secure & default) or BL32 (secure). 37 ******************************************************************************/ 38 static uint32_t next_image_type = NON_SECURE; 39 40 /* 41 * Implement the ARM Standard Service function to get arguments for a 42 * particular service. 43 */ 44 uintptr_t get_arm_std_svc_args(unsigned int svc_mask) 45 { 46 /* Setup the arguments for PSCI Library */ 47 DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, bl31_warm_entrypoint); 48 49 /* PSCI is the only ARM Standard Service implemented */ 50 assert(svc_mask == PSCI_FID_MASK); 51 52 return (uintptr_t)&psci_args; 53 } 54 55 /******************************************************************************* 56 * Simple function to initialise all BL31 helper libraries. 57 ******************************************************************************/ 58 void bl31_lib_init(void) 59 { 60 cm_init(); 61 } 62 63 /******************************************************************************* 64 * BL31 is responsible for setting up the runtime services for the primary cpu 65 * before passing control to the bootloader or an Operating System. This 66 * function calls runtime_svc_init() which initializes all registered runtime 67 * services. The run time services would setup enough context for the core to 68 * swtich to the next exception level. When this function returns, the core will 69 * switch to the programmed exception level via. an ERET. 70 ******************************************************************************/ 71 void bl31_main(void) 72 { 73 NOTICE("BL31: %s\n", version_string); 74 NOTICE("BL31: %s\n", build_message); 75 76 /* Perform platform setup in BL31 */ 77 bl31_platform_setup(); 78 79 /* Initialise helper libraries */ 80 bl31_lib_init(); 81 82 /* Initialize the runtime services e.g. psci. */ 83 INFO("BL31: Initializing runtime services\n"); 84 runtime_svc_init(); 85 86 /* 87 * All the cold boot actions on the primary cpu are done. We now need to 88 * decide which is the next image (BL32 or BL33) and how to execute it. 89 * If the SPD runtime service is present, it would want to pass control 90 * to BL32 first in S-EL1. In that case, SPD would have registered a 91 * function to intialize bl32 where it takes responsibility of entering 92 * S-EL1 and returning control back to bl31_main. Once this is done we 93 * can prepare entry into BL33 as normal. 94 */ 95 96 /* 97 * If SPD had registerd an init hook, invoke it. 98 */ 99 if (bl32_init) { 100 INFO("BL31: Initializing BL32\n"); 101 (*bl32_init)(); 102 } 103 /* 104 * We are ready to enter the next EL. Prepare entry into the image 105 * corresponding to the desired security state after the next ERET. 106 */ 107 bl31_prepare_next_image_entry(); 108 109 console_flush(); 110 111 /* 112 * Perform any platform specific runtime setup prior to cold boot exit 113 * from BL31 114 */ 115 bl31_plat_runtime_setup(); 116 } 117 118 /******************************************************************************* 119 * Accessor functions to help runtime services decide which image should be 120 * executed after BL31. This is BL33 or the non-secure bootloader image by 121 * default but the Secure payload dispatcher could override this by requesting 122 * an entry into BL32 (Secure payload) first. If it does so then it should use 123 * the same API to program an entry into BL33 once BL32 initialisation is 124 * complete. 125 ******************************************************************************/ 126 void bl31_set_next_image_type(uint32_t security_state) 127 { 128 assert(sec_state_is_valid(security_state)); 129 next_image_type = security_state; 130 } 131 132 uint32_t bl31_get_next_image_type(void) 133 { 134 return next_image_type; 135 } 136 137 /******************************************************************************* 138 * This function programs EL3 registers and performs other setup to enable entry 139 * into the next image after BL31 at the next ERET. 140 ******************************************************************************/ 141 void bl31_prepare_next_image_entry(void) 142 { 143 entry_point_info_t *next_image_info; 144 uint32_t image_type; 145 146 #if CTX_INCLUDE_AARCH32_REGS 147 /* 148 * Ensure that the build flag to save AArch32 system registers in CPU 149 * context is not set for AArch64-only platforms. 150 */ 151 if (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_EL1_SHIFT) 152 & ID_AA64PFR0_ELX_MASK) == 0x1) { 153 ERROR("EL1 supports AArch64-only. Please set build flag " 154 "CTX_INCLUDE_AARCH32_REGS = 0"); 155 panic(); 156 } 157 #endif 158 159 /* Determine which image to execute next */ 160 image_type = bl31_get_next_image_type(); 161 162 /* Program EL3 registers to enable entry into the next EL */ 163 next_image_info = bl31_plat_get_next_image_ep_info(image_type); 164 assert(next_image_info); 165 assert(image_type == GET_SECURITY_STATE(next_image_info->h.attr)); 166 167 INFO("BL31: Preparing for EL3 exit to %s world\n", 168 (image_type == SECURE) ? "secure" : "normal"); 169 print_entry_point_info(next_image_info); 170 cm_init_my_context(next_image_info); 171 cm_prepare_el3_exit(image_type); 172 } 173 174 /******************************************************************************* 175 * This function initializes the pointer to BL32 init function. This is expected 176 * to be called by the SPD after it finishes all its initialization 177 ******************************************************************************/ 178 void bl31_register_bl32_init(int32_t (*func)(void)) 179 { 180 bl32_init = func; 181 } 182