1 /* 2 * Copyright (c) 2013-2024, 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_features.h> 12 #include <arch_helpers.h> 13 #include <bl31/bl31.h> 14 #include <bl31/ehf.h> 15 #include <common/bl_common.h> 16 #include <common/build_message.h> 17 #include <common/debug.h> 18 #include <common/feat_detect.h> 19 #include <common/runtime_svc.h> 20 #include <drivers/console.h> 21 #include <lib/bootmarker_capture.h> 22 #include <lib/el3_runtime/context_debug.h> 23 #include <lib/el3_runtime/context_mgmt.h> 24 #include <lib/pmf/pmf.h> 25 #include <lib/runtime_instr.h> 26 #include <plat/common/platform.h> 27 #include <services/std_svc.h> 28 29 #if ENABLE_RUNTIME_INSTRUMENTATION 30 PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID, 31 RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE) 32 #endif 33 34 #if ENABLE_RUNTIME_INSTRUMENTATION 35 PMF_REGISTER_SERVICE(bl_svc, PMF_RT_INSTR_SVC_ID, 36 BL_TOTAL_IDS, PMF_DUMP_ENABLE) 37 #endif 38 39 /******************************************************************************* 40 * This function pointer is used to initialise the BL32 image. It's initialized 41 * by SPD calling bl31_register_bl32_init after setting up all things necessary 42 * for SP execution. In cases where both SPD and SP are absent, or when SPD 43 * finds it impossible to execute SP, this pointer is left as NULL 44 ******************************************************************************/ 45 static int32_t (*bl32_init)(void); 46 47 /***************************************************************************** 48 * Function used to initialise RMM if RME is enabled 49 *****************************************************************************/ 50 #if ENABLE_RME 51 static int32_t (*rmm_init)(void); 52 #endif 53 54 /******************************************************************************* 55 * Variable to indicate whether next image to execute after BL31 is BL33 56 * (non-secure & default) or BL32 (secure). 57 ******************************************************************************/ 58 static uint32_t next_image_type = NON_SECURE; 59 60 #ifdef SUPPORT_UNKNOWN_MPID 61 /* 62 * Flag to know whether an unsupported MPID has been detected. To avoid having it 63 * landing on the .bss section, it is initialized to a non-zero value, this way 64 * we avoid potential WAW hazards during system bring up. 65 * */ 66 volatile uint32_t unsupported_mpid_flag = 1; 67 #endif 68 69 /* 70 * Implement the ARM Standard Service function to get arguments for a 71 * particular service. 72 */ 73 uintptr_t get_arm_std_svc_args(unsigned int svc_mask) 74 { 75 /* Setup the arguments for PSCI Library */ 76 DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, bl31_warm_entrypoint); 77 78 /* PSCI is the only ARM Standard Service implemented */ 79 assert(svc_mask == PSCI_FID_MASK); 80 81 return (uintptr_t)&psci_args; 82 } 83 84 /******************************************************************************* 85 * Simple function to initialise all BL31 helper libraries. 86 ******************************************************************************/ 87 static void __init bl31_lib_init(void) 88 { 89 cm_init(); 90 } 91 92 /******************************************************************************* 93 * Setup function for BL31. 94 ******************************************************************************/ 95 void bl31_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 96 u_register_t arg3) 97 { 98 /* Perform early platform-specific setup */ 99 bl31_early_platform_setup2(arg0, arg1, arg2, arg3); 100 101 /* Perform late platform-specific setup */ 102 bl31_plat_arch_setup(); 103 104 #if CTX_INCLUDE_PAUTH_REGS 105 /* 106 * Assert that the ARMv8.3-PAuth registers are present or an access 107 * fault will be triggered when they are being saved or restored. 108 */ 109 assert(is_armv8_3_pauth_present()); 110 #endif /* CTX_INCLUDE_PAUTH_REGS */ 111 112 /* Prints context_memory allocated for all the security states */ 113 report_ctx_memory_usage(); 114 } 115 116 /******************************************************************************* 117 * BL31 is responsible for setting up the runtime services for the primary cpu 118 * before passing control to the bootloader or an Operating System. This 119 * function calls runtime_svc_init() which initializes all registered runtime 120 * services. The run time services would setup enough context for the core to 121 * switch to the next exception level. When this function returns, the core will 122 * switch to the programmed exception level via an ERET. 123 ******************************************************************************/ 124 void bl31_main(void) 125 { 126 /* Init registers that never change for the lifetime of TF-A */ 127 cm_manage_extensions_el3(); 128 129 /* Init per-world context registers for non-secure world */ 130 manage_extensions_nonsecure_per_world(); 131 132 NOTICE("BL31: %s\n", build_version_string); 133 NOTICE("BL31: %s\n", build_message); 134 135 #if FEATURE_DETECTION 136 /* Detect if features enabled during compilation are supported by PE. */ 137 detect_arch_features(); 138 #endif /* FEATURE_DETECTION */ 139 140 #if ENABLE_RUNTIME_INSTRUMENTATION 141 PMF_CAPTURE_TIMESTAMP(bl_svc, BL31_ENTRY, PMF_CACHE_MAINT); 142 #endif 143 144 #ifdef SUPPORT_UNKNOWN_MPID 145 if (unsupported_mpid_flag == 0) { 146 NOTICE("Unsupported MPID detected!\n"); 147 } 148 #endif 149 150 /* Perform platform setup in BL31 */ 151 bl31_platform_setup(); 152 153 /* Initialise helper libraries */ 154 bl31_lib_init(); 155 156 #if EL3_EXCEPTION_HANDLING 157 INFO("BL31: Initialising Exception Handling Framework\n"); 158 ehf_init(); 159 #endif 160 161 /* Initialize the runtime services e.g. psci. */ 162 INFO("BL31: Initializing runtime services\n"); 163 runtime_svc_init(); 164 165 /* 166 * All the cold boot actions on the primary cpu are done. We now need to 167 * decide which is the next image and how to execute it. 168 * If the SPD runtime service is present, it would want to pass control 169 * to BL32 first in S-EL1. In that case, SPD would have registered a 170 * function to initialize bl32 where it takes responsibility of entering 171 * S-EL1 and returning control back to bl31_main. Similarly, if RME is 172 * enabled and a function is registered to initialize RMM, control is 173 * transferred to RMM in R-EL2. After RMM initialization, control is 174 * returned back to bl31_main. Once this is done we can prepare entry 175 * into BL33 as normal. 176 */ 177 178 /* 179 * If SPD had registered an init hook, invoke it. 180 */ 181 if (bl32_init != NULL) { 182 INFO("BL31: Initializing BL32\n"); 183 184 console_flush(); 185 int32_t rc = (*bl32_init)(); 186 187 if (rc == 0) { 188 WARN("BL31: BL32 initialization failed\n"); 189 } 190 } 191 192 /* 193 * If RME is enabled and init hook is registered, initialize RMM 194 * in R-EL2. 195 */ 196 #if ENABLE_RME 197 if (rmm_init != NULL) { 198 INFO("BL31: Initializing RMM\n"); 199 200 console_flush(); 201 int32_t rc = (*rmm_init)(); 202 203 if (rc == 0) { 204 WARN("BL31: RMM initialization failed\n"); 205 } 206 } 207 #endif 208 209 /* 210 * We are ready to enter the next EL. Prepare entry into the image 211 * corresponding to the desired security state after the next ERET. 212 */ 213 bl31_prepare_next_image_entry(); 214 215 console_flush(); 216 217 /* 218 * Perform any platform specific runtime setup prior to cold boot exit 219 * from BL31 220 */ 221 bl31_plat_runtime_setup(); 222 223 #if ENABLE_RUNTIME_INSTRUMENTATION 224 PMF_CAPTURE_TIMESTAMP(bl_svc, BL31_EXIT, PMF_CACHE_MAINT); 225 console_flush(); 226 #endif 227 } 228 229 /******************************************************************************* 230 * Accessor functions to help runtime services decide which image should be 231 * executed after BL31. This is BL33 or the non-secure bootloader image by 232 * default but the Secure payload dispatcher could override this by requesting 233 * an entry into BL32 (Secure payload) first. If it does so then it should use 234 * the same API to program an entry into BL33 once BL32 initialisation is 235 * complete. 236 ******************************************************************************/ 237 void bl31_set_next_image_type(uint32_t security_state) 238 { 239 assert(sec_state_is_valid(security_state)); 240 next_image_type = security_state; 241 } 242 243 uint32_t bl31_get_next_image_type(void) 244 { 245 return next_image_type; 246 } 247 248 /******************************************************************************* 249 * This function programs EL3 registers and performs other setup to enable entry 250 * into the next image after BL31 at the next ERET. 251 ******************************************************************************/ 252 void __init bl31_prepare_next_image_entry(void) 253 { 254 entry_point_info_t *next_image_info; 255 uint32_t image_type; 256 257 #if CTX_INCLUDE_AARCH32_REGS 258 /* 259 * Ensure that the build flag to save AArch32 system registers in CPU 260 * context is not set for AArch64-only platforms. 261 */ 262 if (el_implemented(1) == EL_IMPL_A64ONLY) { 263 ERROR("EL1 supports AArch64-only. Please set build flag " 264 "CTX_INCLUDE_AARCH32_REGS = 0\n"); 265 panic(); 266 } 267 #endif 268 269 /* Determine which image to execute next */ 270 image_type = bl31_get_next_image_type(); 271 272 /* Program EL3 registers to enable entry into the next EL */ 273 next_image_info = bl31_plat_get_next_image_ep_info(image_type); 274 assert(next_image_info != NULL); 275 assert(image_type == GET_SECURITY_STATE(next_image_info->h.attr)); 276 277 INFO("BL31: Preparing for EL3 exit to %s world\n", 278 (image_type == SECURE) ? "secure" : "normal"); 279 print_entry_point_info(next_image_info); 280 cm_init_my_context(next_image_info); 281 282 /* 283 * If we are entering the Non-secure world, use 284 * 'cm_prepare_el3_exit_ns' to exit. 285 */ 286 if (image_type == NON_SECURE) { 287 cm_prepare_el3_exit_ns(); 288 } else { 289 cm_prepare_el3_exit(image_type); 290 } 291 } 292 293 /******************************************************************************* 294 * This function initializes the pointer to BL32 init function. This is expected 295 * to be called by the SPD after it finishes all its initialization 296 ******************************************************************************/ 297 void bl31_register_bl32_init(int32_t (*func)(void)) 298 { 299 bl32_init = func; 300 } 301 302 #if ENABLE_RME 303 /******************************************************************************* 304 * This function initializes the pointer to RMM init function. This is expected 305 * to be called by the RMMD after it finishes all its initialization 306 ******************************************************************************/ 307 void bl31_register_rmm_init(int32_t (*func)(void)) 308 { 309 rmm_init = func; 310 } 311 #endif 312