1 /* 2 * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 #include <string.h> 9 10 #include <arch.h> 11 #include <arch_helpers.h> 12 #include <bl31/bl31.h> 13 #include <bl31/ehf.h> 14 #include <common/bl_common.h> 15 #include <common/debug.h> 16 #include <common/runtime_svc.h> 17 #include <drivers/console.h> 18 #include <lib/el3_runtime/context_mgmt.h> 19 #include <lib/pmf/pmf.h> 20 #include <lib/runtime_instr.h> 21 #include <plat/common/platform.h> 22 #include <services/std_svc.h> 23 24 #if ENABLE_RUNTIME_INSTRUMENTATION 25 PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID, 26 RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE) 27 #endif 28 29 /******************************************************************************* 30 * This function pointer is used to initialise the BL32 image. It's initialized 31 * by SPD calling bl31_register_bl32_init after setting up all things necessary 32 * for SP execution. In cases where both SPD and SP are absent, or when SPD 33 * finds it impossible to execute SP, this pointer is left as NULL 34 ******************************************************************************/ 35 static int32_t (*bl32_init)(void); 36 37 /******************************************************************************* 38 * Variable to indicate whether next image to execute after BL31 is BL33 39 * (non-secure & default) or BL32 (secure). 40 ******************************************************************************/ 41 static uint32_t next_image_type = NON_SECURE; 42 43 /* 44 * Implement the ARM Standard Service function to get arguments for a 45 * particular service. 46 */ 47 uintptr_t get_arm_std_svc_args(unsigned int svc_mask) 48 { 49 /* Setup the arguments for PSCI Library */ 50 DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, bl31_warm_entrypoint); 51 52 /* PSCI is the only ARM Standard Service implemented */ 53 assert(svc_mask == PSCI_FID_MASK); 54 55 return (uintptr_t)&psci_args; 56 } 57 58 /******************************************************************************* 59 * Simple function to initialise all BL31 helper libraries. 60 ******************************************************************************/ 61 void __init bl31_lib_init(void) 62 { 63 cm_init(); 64 } 65 66 /******************************************************************************* 67 * BL31 is responsible for setting up the runtime services for the primary cpu 68 * before passing control to the bootloader or an Operating System. This 69 * function calls runtime_svc_init() which initializes all registered runtime 70 * services. The run time services would setup enough context for the core to 71 * switch to the next exception level. When this function returns, the core will 72 * switch to the programmed exception level via. an ERET. 73 ******************************************************************************/ 74 void bl31_main(void) 75 { 76 NOTICE("BL31: %s\n", version_string); 77 NOTICE("BL31: %s\n", build_message); 78 79 /* Perform platform setup in BL31 */ 80 bl31_platform_setup(); 81 82 /* Initialise helper libraries */ 83 bl31_lib_init(); 84 85 #if EL3_EXCEPTION_HANDLING 86 INFO("BL31: Initialising Exception Handling Framework\n"); 87 ehf_init(); 88 #endif 89 90 /* Initialize the runtime services e.g. psci. */ 91 INFO("BL31: Initializing runtime services\n"); 92 runtime_svc_init(); 93 94 /* 95 * All the cold boot actions on the primary cpu are done. We now need to 96 * decide which is the next image (BL32 or BL33) and how to execute it. 97 * If the SPD runtime service is present, it would want to pass control 98 * to BL32 first in S-EL1. In that case, SPD would have registered a 99 * function to initialize bl32 where it takes responsibility of entering 100 * S-EL1 and returning control back to bl31_main. Once this is done we 101 * can prepare entry into BL33 as normal. 102 */ 103 104 /* 105 * If SPD had registered an init hook, invoke it. 106 */ 107 if (bl32_init != NULL) { 108 INFO("BL31: Initializing BL32\n"); 109 110 int32_t rc = (*bl32_init)(); 111 112 if (rc == 0) 113 WARN("BL31: BL32 initialization failed\n"); 114 } 115 /* 116 * We are ready to enter the next EL. Prepare entry into the image 117 * corresponding to the desired security state after the next ERET. 118 */ 119 bl31_prepare_next_image_entry(); 120 121 console_flush(); 122 123 /* 124 * Perform any platform specific runtime setup prior to cold boot exit 125 * from BL31 126 */ 127 bl31_plat_runtime_setup(); 128 } 129 130 /******************************************************************************* 131 * Accessor functions to help runtime services decide which image should be 132 * executed after BL31. This is BL33 or the non-secure bootloader image by 133 * default but the Secure payload dispatcher could override this by requesting 134 * an entry into BL32 (Secure payload) first. If it does so then it should use 135 * the same API to program an entry into BL33 once BL32 initialisation is 136 * complete. 137 ******************************************************************************/ 138 void bl31_set_next_image_type(uint32_t security_state) 139 { 140 assert(sec_state_is_valid(security_state)); 141 next_image_type = security_state; 142 } 143 144 uint32_t bl31_get_next_image_type(void) 145 { 146 return next_image_type; 147 } 148 149 /******************************************************************************* 150 * This function programs EL3 registers and performs other setup to enable entry 151 * into the next image after BL31 at the next ERET. 152 ******************************************************************************/ 153 void __init bl31_prepare_next_image_entry(void) 154 { 155 entry_point_info_t *next_image_info; 156 uint32_t image_type; 157 158 #if CTX_INCLUDE_AARCH32_REGS 159 /* 160 * Ensure that the build flag to save AArch32 system registers in CPU 161 * context is not set for AArch64-only platforms. 162 */ 163 if (el_implemented(1) == EL_IMPL_A64ONLY) { 164 ERROR("EL1 supports AArch64-only. Please set build flag " 165 "CTX_INCLUDE_AARCH32_REGS = 0\n"); 166 panic(); 167 } 168 #endif 169 170 /* Determine which image to execute next */ 171 image_type = bl31_get_next_image_type(); 172 173 /* Program EL3 registers to enable entry into the next EL */ 174 next_image_info = bl31_plat_get_next_image_ep_info(image_type); 175 assert(next_image_info != NULL); 176 assert(image_type == GET_SECURITY_STATE(next_image_info->h.attr)); 177 178 INFO("BL31: Preparing for EL3 exit to %s world\n", 179 (image_type == SECURE) ? "secure" : "normal"); 180 print_entry_point_info(next_image_info); 181 cm_init_my_context(next_image_info); 182 cm_prepare_el3_exit(image_type); 183 } 184 185 /******************************************************************************* 186 * This function initializes the pointer to BL32 init function. This is expected 187 * to be called by the SPD after it finishes all its initialization 188 ******************************************************************************/ 189 void bl31_register_bl32_init(int32_t (*func)(void)) 190 { 191 bl32_init = func; 192 } 193