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 * Setup function for BL31. 68 ******************************************************************************/ 69 void bl31_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 70 u_register_t arg3) 71 { 72 /* Perform early platform-specific setup */ 73 bl31_early_platform_setup2(arg0, arg1, arg2, arg3); 74 75 /* 76 * Update pointer authentication key before the MMU is enabled. It is 77 * saved in the rodata section, that can be writen before enabling the 78 * MMU. This function must be called after the console is initialized 79 * in the early platform setup. 80 */ 81 bl_handle_pauth(); 82 83 /* Perform late platform-specific setup */ 84 bl31_plat_arch_setup(); 85 } 86 87 /******************************************************************************* 88 * BL31 is responsible for setting up the runtime services for the primary cpu 89 * before passing control to the bootloader or an Operating System. This 90 * function calls runtime_svc_init() which initializes all registered runtime 91 * services. The run time services would setup enough context for the core to 92 * switch to the next exception level. When this function returns, the core will 93 * switch to the programmed exception level via an ERET. 94 ******************************************************************************/ 95 void bl31_main(void) 96 { 97 NOTICE("BL31: %s\n", version_string); 98 NOTICE("BL31: %s\n", build_message); 99 100 /* Perform platform setup in BL31 */ 101 bl31_platform_setup(); 102 103 /* Initialise helper libraries */ 104 bl31_lib_init(); 105 106 #if EL3_EXCEPTION_HANDLING 107 INFO("BL31: Initialising Exception Handling Framework\n"); 108 ehf_init(); 109 #endif 110 111 /* Initialize the runtime services e.g. psci. */ 112 INFO("BL31: Initializing runtime services\n"); 113 runtime_svc_init(); 114 115 /* 116 * All the cold boot actions on the primary cpu are done. We now need to 117 * decide which is the next image (BL32 or BL33) and how to execute it. 118 * If the SPD runtime service is present, it would want to pass control 119 * to BL32 first in S-EL1. In that case, SPD would have registered a 120 * function to initialize bl32 where it takes responsibility of entering 121 * S-EL1 and returning control back to bl31_main. Once this is done we 122 * can prepare entry into BL33 as normal. 123 */ 124 125 /* 126 * If SPD had registered an init hook, invoke it. 127 */ 128 if (bl32_init != NULL) { 129 INFO("BL31: Initializing BL32\n"); 130 131 int32_t rc = (*bl32_init)(); 132 133 if (rc == 0) 134 WARN("BL31: BL32 initialization failed\n"); 135 } 136 /* 137 * We are ready to enter the next EL. Prepare entry into the image 138 * corresponding to the desired security state after the next ERET. 139 */ 140 bl31_prepare_next_image_entry(); 141 142 console_flush(); 143 144 /* 145 * Perform any platform specific runtime setup prior to cold boot exit 146 * from BL31 147 */ 148 bl31_plat_runtime_setup(); 149 } 150 151 /******************************************************************************* 152 * Accessor functions to help runtime services decide which image should be 153 * executed after BL31. This is BL33 or the non-secure bootloader image by 154 * default but the Secure payload dispatcher could override this by requesting 155 * an entry into BL32 (Secure payload) first. If it does so then it should use 156 * the same API to program an entry into BL33 once BL32 initialisation is 157 * complete. 158 ******************************************************************************/ 159 void bl31_set_next_image_type(uint32_t security_state) 160 { 161 assert(sec_state_is_valid(security_state)); 162 next_image_type = security_state; 163 } 164 165 uint32_t bl31_get_next_image_type(void) 166 { 167 return next_image_type; 168 } 169 170 /******************************************************************************* 171 * This function programs EL3 registers and performs other setup to enable entry 172 * into the next image after BL31 at the next ERET. 173 ******************************************************************************/ 174 void __init bl31_prepare_next_image_entry(void) 175 { 176 entry_point_info_t *next_image_info; 177 uint32_t image_type; 178 179 #if CTX_INCLUDE_AARCH32_REGS 180 /* 181 * Ensure that the build flag to save AArch32 system registers in CPU 182 * context is not set for AArch64-only platforms. 183 */ 184 if (el_implemented(1) == EL_IMPL_A64ONLY) { 185 ERROR("EL1 supports AArch64-only. Please set build flag " 186 "CTX_INCLUDE_AARCH32_REGS = 0\n"); 187 panic(); 188 } 189 #endif 190 191 /* Determine which image to execute next */ 192 image_type = bl31_get_next_image_type(); 193 194 /* Program EL3 registers to enable entry into the next EL */ 195 next_image_info = bl31_plat_get_next_image_ep_info(image_type); 196 assert(next_image_info != NULL); 197 assert(image_type == GET_SECURITY_STATE(next_image_info->h.attr)); 198 199 INFO("BL31: Preparing for EL3 exit to %s world\n", 200 (image_type == SECURE) ? "secure" : "normal"); 201 print_entry_point_info(next_image_info); 202 cm_init_my_context(next_image_info); 203 cm_prepare_el3_exit(image_type); 204 } 205 206 /******************************************************************************* 207 * This function initializes the pointer to BL32 init function. This is expected 208 * to be called by the SPD after it finishes all its initialization 209 ******************************************************************************/ 210 void bl31_register_bl32_init(int32_t (*func)(void)) 211 { 212 bl32_init = func; 213 } 214