1 /* 2 * Copyright (c) 2013-2018, 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 <bl31.h> 11 #include <bl_common.h> 12 #include <console.h> 13 #include <context_mgmt.h> 14 #include <debug.h> 15 #include <ehf.h> 16 #include <platform.h> 17 #include <pmf.h> 18 #include <runtime_instr.h> 19 #include <runtime_svc.h> 20 #include <std_svc.h> 21 #include <string.h> 22 23 #if ENABLE_RUNTIME_INSTRUMENTATION 24 PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID, 25 RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE) 26 #endif 27 28 /******************************************************************************* 29 * This function pointer is used to initialise the BL32 image. It's initialized 30 * by SPD calling bl31_register_bl32_init after setting up all things necessary 31 * for SP execution. In cases where both SPD and SP are absent, or when SPD 32 * finds it impossible to execute SP, this pointer is left as NULL 33 ******************************************************************************/ 34 static int32_t (*bl32_init)(void); 35 36 /******************************************************************************* 37 * Variable to indicate whether next image to execute after BL31 is BL33 38 * (non-secure & default) or BL32 (secure). 39 ******************************************************************************/ 40 static uint32_t next_image_type = NON_SECURE; 41 42 /* 43 * Implement the ARM Standard Service function to get arguments for a 44 * particular service. 45 */ 46 uintptr_t get_arm_std_svc_args(unsigned int svc_mask) 47 { 48 /* Setup the arguments for PSCI Library */ 49 DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, bl31_warm_entrypoint); 50 51 /* PSCI is the only ARM Standard Service implemented */ 52 assert(svc_mask == PSCI_FID_MASK); 53 54 return (uintptr_t)&psci_args; 55 } 56 57 /******************************************************************************* 58 * Simple function to initialise all BL31 helper libraries. 59 ******************************************************************************/ 60 void __init bl31_lib_init(void) 61 { 62 cm_init(); 63 } 64 65 /******************************************************************************* 66 * BL31 is responsible for setting up the runtime services for the primary cpu 67 * before passing control to the bootloader or an Operating System. This 68 * function calls runtime_svc_init() which initializes all registered runtime 69 * services. The run time services would setup enough context for the core to 70 * swtich to the next exception level. When this function returns, the core will 71 * switch to the programmed exception level via. an ERET. 72 ******************************************************************************/ 73 void bl31_main(void) 74 { 75 NOTICE("BL31: %s\n", version_string); 76 NOTICE("BL31: %s\n", build_message); 77 78 /* Perform platform setup in BL31 */ 79 bl31_platform_setup(); 80 81 /* Initialise helper libraries */ 82 bl31_lib_init(); 83 84 #if EL3_EXCEPTION_HANDLING 85 INFO("BL31: Initialising Exception Handling Framework\n"); 86 ehf_init(); 87 #endif 88 89 /* Initialize the runtime services e.g. psci. */ 90 INFO("BL31: Initializing runtime services\n"); 91 runtime_svc_init(); 92 93 /* 94 * All the cold boot actions on the primary cpu are done. We now need to 95 * decide which is the next image (BL32 or BL33) and how to execute it. 96 * If the SPD runtime service is present, it would want to pass control 97 * to BL32 first in S-EL1. In that case, SPD would have registered a 98 * function to intialize bl32 where it takes responsibility of entering 99 * S-EL1 and returning control back to bl31_main. Once this is done we 100 * can prepare entry into BL33 as normal. 101 */ 102 103 /* 104 * If SPD had registerd an init hook, invoke it. 105 */ 106 if (bl32_init != NULL) { 107 INFO("BL31: Initializing BL32\n"); 108 109 int32_t rc = (*bl32_init)(); 110 111 if (rc == 0) 112 WARN("BL31: BL32 initialization failed\n"); 113 } 114 /* 115 * We are ready to enter the next EL. Prepare entry into the image 116 * corresponding to the desired security state after the next ERET. 117 */ 118 bl31_prepare_next_image_entry(); 119 120 console_flush(); 121 122 /* 123 * Perform any platform specific runtime setup prior to cold boot exit 124 * from BL31 125 */ 126 bl31_plat_runtime_setup(); 127 } 128 129 /******************************************************************************* 130 * Accessor functions to help runtime services decide which image should be 131 * executed after BL31. This is BL33 or the non-secure bootloader image by 132 * default but the Secure payload dispatcher could override this by requesting 133 * an entry into BL32 (Secure payload) first. If it does so then it should use 134 * the same API to program an entry into BL33 once BL32 initialisation is 135 * complete. 136 ******************************************************************************/ 137 void bl31_set_next_image_type(uint32_t security_state) 138 { 139 assert(sec_state_is_valid(security_state)); 140 next_image_type = security_state; 141 } 142 143 uint32_t bl31_get_next_image_type(void) 144 { 145 return next_image_type; 146 } 147 148 /******************************************************************************* 149 * This function programs EL3 registers and performs other setup to enable entry 150 * into the next image after BL31 at the next ERET. 151 ******************************************************************************/ 152 void __init bl31_prepare_next_image_entry(void) 153 { 154 entry_point_info_t *next_image_info; 155 uint32_t image_type; 156 157 #if CTX_INCLUDE_AARCH32_REGS 158 /* 159 * Ensure that the build flag to save AArch32 system registers in CPU 160 * context is not set for AArch64-only platforms. 161 */ 162 if (el_implemented(1) == EL_IMPL_A64ONLY) { 163 ERROR("EL1 supports AArch64-only. Please set build flag " 164 "CTX_INCLUDE_AARCH32_REGS = 0\n"); 165 panic(); 166 } 167 #endif 168 169 /* Determine which image to execute next */ 170 image_type = bl31_get_next_image_type(); 171 172 /* Program EL3 registers to enable entry into the next EL */ 173 next_image_info = bl31_plat_get_next_image_ep_info(image_type); 174 assert(next_image_info != NULL); 175 assert(image_type == GET_SECURITY_STATE(next_image_info->h.attr)); 176 177 INFO("BL31: Preparing for EL3 exit to %s world\n", 178 (image_type == SECURE) ? "secure" : "normal"); 179 print_entry_point_info(next_image_info); 180 cm_init_my_context(next_image_info); 181 cm_prepare_el3_exit(image_type); 182 } 183 184 /******************************************************************************* 185 * This function initializes the pointer to BL32 init function. This is expected 186 * to be called by the SPD after it finishes all its initialization 187 ******************************************************************************/ 188 void bl31_register_bl32_init(int32_t (*func)(void)) 189 { 190 bl32_init = func; 191 } 192