1 /* 2 * Copyright (c) 2013-2023, 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/debug.h> 17 #include <common/feat_detect.h> 18 #include <common/runtime_svc.h> 19 #include <drivers/console.h> 20 #include <lib/bootmarker_capture.h> 21 #include <lib/el3_runtime/context_mgmt.h> 22 #include <lib/pmf/pmf.h> 23 #include <lib/runtime_instr.h> 24 #include <plat/common/platform.h> 25 #include <services/std_svc.h> 26 27 #if ENABLE_RUNTIME_INSTRUMENTATION 28 PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID, 29 RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE) 30 #endif 31 32 #if ENABLE_RUNTIME_INSTRUMENTATION 33 PMF_REGISTER_SERVICE(bl_svc, PMF_RT_INSTR_SVC_ID, 34 BL_TOTAL_IDS, PMF_DUMP_ENABLE) 35 #endif 36 37 /******************************************************************************* 38 * This function pointer is used to initialise the BL32 image. It's initialized 39 * by SPD calling bl31_register_bl32_init after setting up all things necessary 40 * for SP execution. In cases where both SPD and SP are absent, or when SPD 41 * finds it impossible to execute SP, this pointer is left as NULL 42 ******************************************************************************/ 43 static int32_t (*bl32_init)(void); 44 45 /***************************************************************************** 46 * Function used to initialise RMM if RME is enabled 47 *****************************************************************************/ 48 #if ENABLE_RME 49 static int32_t (*rmm_init)(void); 50 #endif 51 52 /******************************************************************************* 53 * Variable to indicate whether next image to execute after BL31 is BL33 54 * (non-secure & default) or BL32 (secure). 55 ******************************************************************************/ 56 static uint32_t next_image_type = NON_SECURE; 57 58 #ifdef SUPPORT_UNKNOWN_MPID 59 /* 60 * Flag to know whether an unsupported MPID has been detected. To avoid having it 61 * landing on the .bss section, it is initialized to a non-zero value, this way 62 * we avoid potential WAW hazards during system bring up. 63 * */ 64 volatile uint32_t unsupported_mpid_flag = 1; 65 #endif 66 67 /* 68 * Implement the ARM Standard Service function to get arguments for a 69 * particular service. 70 */ 71 uintptr_t get_arm_std_svc_args(unsigned int svc_mask) 72 { 73 /* Setup the arguments for PSCI Library */ 74 DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, bl31_warm_entrypoint); 75 76 /* PSCI is the only ARM Standard Service implemented */ 77 assert(svc_mask == PSCI_FID_MASK); 78 79 return (uintptr_t)&psci_args; 80 } 81 82 /******************************************************************************* 83 * Simple function to initialise all BL31 helper libraries. 84 ******************************************************************************/ 85 void __init bl31_lib_init(void) 86 { 87 cm_init(); 88 } 89 90 /******************************************************************************* 91 * Setup function for BL31. 92 ******************************************************************************/ 93 void bl31_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 94 u_register_t arg3) 95 { 96 /* Perform early platform-specific setup */ 97 bl31_early_platform_setup2(arg0, arg1, arg2, arg3); 98 99 /* Perform late platform-specific setup */ 100 bl31_plat_arch_setup(); 101 102 #if CTX_INCLUDE_PAUTH_REGS 103 /* 104 * Assert that the ARMv8.3-PAuth registers are present or an access 105 * fault will be triggered when they are being saved or restored. 106 */ 107 assert(is_armv8_3_pauth_present()); 108 #endif /* CTX_INCLUDE_PAUTH_REGS */ 109 } 110 111 /******************************************************************************* 112 * BL31 is responsible for setting up the runtime services for the primary cpu 113 * before passing control to the bootloader or an Operating System. This 114 * function calls runtime_svc_init() which initializes all registered runtime 115 * services. The run time services would setup enough context for the core to 116 * switch to the next exception level. When this function returns, the core will 117 * switch to the programmed exception level via an ERET. 118 ******************************************************************************/ 119 void bl31_main(void) 120 { 121 /* Init registers that never change for the lifetime of TF-A */ 122 cm_manage_extensions_el3(); 123 124 /* Init per-world context registers for non-secure world */ 125 manage_extensions_nonsecure_per_world(); 126 127 NOTICE("BL31: %s\n", version_string); 128 NOTICE("BL31: %s\n", build_message); 129 130 #if FEATURE_DETECTION 131 /* Detect if features enabled during compilation are supported by PE. */ 132 detect_arch_features(); 133 #endif /* FEATURE_DETECTION */ 134 135 #if ENABLE_RUNTIME_INSTRUMENTATION 136 PMF_CAPTURE_TIMESTAMP(bl_svc, BL31_ENTRY, PMF_CACHE_MAINT); 137 #endif 138 139 #ifdef SUPPORT_UNKNOWN_MPID 140 if (unsupported_mpid_flag == 0) { 141 NOTICE("Unsupported MPID detected!\n"); 142 } 143 #endif 144 145 /* Perform platform setup in BL31 */ 146 bl31_platform_setup(); 147 148 /* Initialise helper libraries */ 149 bl31_lib_init(); 150 151 #if EL3_EXCEPTION_HANDLING 152 INFO("BL31: Initialising Exception Handling Framework\n"); 153 ehf_init(); 154 #endif 155 156 /* Initialize the runtime services e.g. psci. */ 157 INFO("BL31: Initializing runtime services\n"); 158 runtime_svc_init(); 159 160 /* 161 * All the cold boot actions on the primary cpu are done. We now need to 162 * decide which is the next image and how to execute it. 163 * If the SPD runtime service is present, it would want to pass control 164 * to BL32 first in S-EL1. In that case, SPD would have registered a 165 * function to initialize bl32 where it takes responsibility of entering 166 * S-EL1 and returning control back to bl31_main. Similarly, if RME is 167 * enabled and a function is registered to initialize RMM, control is 168 * transferred to RMM in R-EL2. After RMM initialization, control is 169 * returned back to bl31_main. Once this is done we can prepare entry 170 * into BL33 as normal. 171 */ 172 173 /* 174 * If SPD had registered an init hook, invoke it. 175 */ 176 if (bl32_init != NULL) { 177 INFO("BL31: Initializing BL32\n"); 178 179 console_flush(); 180 int32_t rc = (*bl32_init)(); 181 182 if (rc == 0) { 183 WARN("BL31: BL32 initialization failed\n"); 184 } 185 } 186 187 /* 188 * If RME is enabled and init hook is registered, initialize RMM 189 * in R-EL2. 190 */ 191 #if ENABLE_RME 192 if (rmm_init != NULL) { 193 INFO("BL31: Initializing RMM\n"); 194 195 console_flush(); 196 int32_t rc = (*rmm_init)(); 197 198 if (rc == 0) { 199 WARN("BL31: RMM initialization failed\n"); 200 } 201 } 202 #endif 203 204 /* 205 * We are ready to enter the next EL. Prepare entry into the image 206 * corresponding to the desired security state after the next ERET. 207 */ 208 bl31_prepare_next_image_entry(); 209 210 console_flush(); 211 212 /* 213 * Perform any platform specific runtime setup prior to cold boot exit 214 * from BL31 215 */ 216 bl31_plat_runtime_setup(); 217 218 #if ENABLE_RUNTIME_INSTRUMENTATION 219 PMF_CAPTURE_TIMESTAMP(bl_svc, BL31_EXIT, PMF_CACHE_MAINT); 220 console_flush(); 221 #endif 222 } 223 224 /******************************************************************************* 225 * Accessor functions to help runtime services decide which image should be 226 * executed after BL31. This is BL33 or the non-secure bootloader image by 227 * default but the Secure payload dispatcher could override this by requesting 228 * an entry into BL32 (Secure payload) first. If it does so then it should use 229 * the same API to program an entry into BL33 once BL32 initialisation is 230 * complete. 231 ******************************************************************************/ 232 void bl31_set_next_image_type(uint32_t security_state) 233 { 234 assert(sec_state_is_valid(security_state)); 235 next_image_type = security_state; 236 } 237 238 uint32_t bl31_get_next_image_type(void) 239 { 240 return next_image_type; 241 } 242 243 /******************************************************************************* 244 * This function programs EL3 registers and performs other setup to enable entry 245 * into the next image after BL31 at the next ERET. 246 ******************************************************************************/ 247 void __init bl31_prepare_next_image_entry(void) 248 { 249 entry_point_info_t *next_image_info; 250 uint32_t image_type; 251 252 #if CTX_INCLUDE_AARCH32_REGS 253 /* 254 * Ensure that the build flag to save AArch32 system registers in CPU 255 * context is not set for AArch64-only platforms. 256 */ 257 if (el_implemented(1) == EL_IMPL_A64ONLY) { 258 ERROR("EL1 supports AArch64-only. Please set build flag " 259 "CTX_INCLUDE_AARCH32_REGS = 0\n"); 260 panic(); 261 } 262 #endif 263 264 /* Determine which image to execute next */ 265 image_type = bl31_get_next_image_type(); 266 267 /* Program EL3 registers to enable entry into the next EL */ 268 next_image_info = bl31_plat_get_next_image_ep_info(image_type); 269 assert(next_image_info != NULL); 270 assert(image_type == GET_SECURITY_STATE(next_image_info->h.attr)); 271 272 INFO("BL31: Preparing for EL3 exit to %s world\n", 273 (image_type == SECURE) ? "secure" : "normal"); 274 print_entry_point_info(next_image_info); 275 cm_init_my_context(next_image_info); 276 277 /* 278 * If we are entering the Non-secure world, use 279 * 'cm_prepare_el3_exit_ns' to exit. 280 */ 281 if (image_type == NON_SECURE) { 282 cm_prepare_el3_exit_ns(); 283 } else { 284 cm_prepare_el3_exit(image_type); 285 } 286 } 287 288 /******************************************************************************* 289 * This function initializes the pointer to BL32 init function. This is expected 290 * to be called by the SPD after it finishes all its initialization 291 ******************************************************************************/ 292 void bl31_register_bl32_init(int32_t (*func)(void)) 293 { 294 bl32_init = func; 295 } 296 297 #if ENABLE_RME 298 /******************************************************************************* 299 * This function initializes the pointer to RMM init function. This is expected 300 * to be called by the RMMD after it finishes all its initialization 301 ******************************************************************************/ 302 void bl31_register_rmm_init(int32_t (*func)(void)) 303 { 304 rmm_init = func; 305 } 306 #endif 307