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_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/runtime_svc.h> 18 #include <drivers/console.h> 19 #include <lib/el3_runtime/context_mgmt.h> 20 #include <lib/pmf/pmf.h> 21 #include <lib/runtime_instr.h> 22 #include <plat/common/platform.h> 23 #include <services/std_svc.h> 24 25 #if ENABLE_RUNTIME_INSTRUMENTATION 26 PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID, 27 RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE) 28 #endif 29 30 /******************************************************************************* 31 * This function pointer is used to initialise the BL32 image. It's initialized 32 * by SPD calling bl31_register_bl32_init after setting up all things necessary 33 * for SP execution. In cases where both SPD and SP are absent, or when SPD 34 * finds it impossible to execute SP, this pointer is left as NULL 35 ******************************************************************************/ 36 static int32_t (*bl32_init)(void); 37 38 /******************************************************************************* 39 * Variable to indicate whether next image to execute after BL31 is BL33 40 * (non-secure & default) or BL32 (secure). 41 ******************************************************************************/ 42 static uint32_t next_image_type = NON_SECURE; 43 44 /* 45 * Implement the ARM Standard Service function to get arguments for a 46 * particular service. 47 */ 48 uintptr_t get_arm_std_svc_args(unsigned int svc_mask) 49 { 50 /* Setup the arguments for PSCI Library */ 51 DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, bl31_warm_entrypoint); 52 53 /* PSCI is the only ARM Standard Service implemented */ 54 assert(svc_mask == PSCI_FID_MASK); 55 56 return (uintptr_t)&psci_args; 57 } 58 59 /******************************************************************************* 60 * Simple function to initialise all BL31 helper libraries. 61 ******************************************************************************/ 62 void __init bl31_lib_init(void) 63 { 64 cm_init(); 65 } 66 67 /******************************************************************************* 68 * Setup function for BL31. 69 ******************************************************************************/ 70 void bl31_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 71 u_register_t arg3) 72 { 73 /* Perform early platform-specific setup */ 74 bl31_early_platform_setup2(arg0, arg1, arg2, arg3); 75 76 /* Perform late platform-specific setup */ 77 bl31_plat_arch_setup(); 78 79 #if CTX_INCLUDE_PAUTH_REGS 80 /* 81 * Assert that the ARMv8.3-PAuth registers are present or an access 82 * fault will be triggered when they are being saved or restored. 83 */ 84 assert(is_armv8_3_pauth_present()); 85 #endif /* CTX_INCLUDE_PAUTH_REGS */ 86 } 87 88 /******************************************************************************* 89 * BL31 is responsible for setting up the runtime services for the primary cpu 90 * before passing control to the bootloader or an Operating System. This 91 * function calls runtime_svc_init() which initializes all registered runtime 92 * services. The run time services would setup enough context for the core to 93 * switch to the next exception level. When this function returns, the core will 94 * switch to the programmed exception level via an ERET. 95 ******************************************************************************/ 96 void bl31_main(void) 97 { 98 NOTICE("BL31: %s\n", version_string); 99 NOTICE("BL31: %s\n", build_message); 100 101 /* Perform platform setup in BL31 */ 102 bl31_platform_setup(); 103 104 /* Initialise helper libraries */ 105 bl31_lib_init(); 106 107 #if EL3_EXCEPTION_HANDLING 108 INFO("BL31: Initialising Exception Handling Framework\n"); 109 ehf_init(); 110 #endif 111 112 /* Initialize the runtime services e.g. psci. */ 113 INFO("BL31: Initializing runtime services\n"); 114 runtime_svc_init(); 115 116 /* 117 * All the cold boot actions on the primary cpu are done. We now need to 118 * decide which is the next image (BL32 or BL33) and how to execute it. 119 * If the SPD runtime service is present, it would want to pass control 120 * to BL32 first in S-EL1. In that case, SPD would have registered a 121 * function to initialize bl32 where it takes responsibility of entering 122 * S-EL1 and returning control back to bl31_main. Once this is done we 123 * can prepare entry into BL33 as normal. 124 */ 125 126 /* 127 * If SPD had registered an init hook, invoke it. 128 */ 129 if (bl32_init != NULL) { 130 INFO("BL31: Initializing BL32\n"); 131 132 int32_t rc = (*bl32_init)(); 133 134 if (rc == 0) 135 WARN("BL31: BL32 initialization failed\n"); 136 } 137 /* 138 * We are ready to enter the next EL. Prepare entry into the image 139 * corresponding to the desired security state after the next ERET. 140 */ 141 bl31_prepare_next_image_entry(); 142 143 console_flush(); 144 145 /* 146 * Perform any platform specific runtime setup prior to cold boot exit 147 * from BL31 148 */ 149 bl31_plat_runtime_setup(); 150 } 151 152 /******************************************************************************* 153 * Accessor functions to help runtime services decide which image should be 154 * executed after BL31. This is BL33 or the non-secure bootloader image by 155 * default but the Secure payload dispatcher could override this by requesting 156 * an entry into BL32 (Secure payload) first. If it does so then it should use 157 * the same API to program an entry into BL33 once BL32 initialisation is 158 * complete. 159 ******************************************************************************/ 160 void bl31_set_next_image_type(uint32_t security_state) 161 { 162 assert(sec_state_is_valid(security_state)); 163 next_image_type = security_state; 164 } 165 166 uint32_t bl31_get_next_image_type(void) 167 { 168 return next_image_type; 169 } 170 171 /******************************************************************************* 172 * This function programs EL3 registers and performs other setup to enable entry 173 * into the next image after BL31 at the next ERET. 174 ******************************************************************************/ 175 void __init bl31_prepare_next_image_entry(void) 176 { 177 entry_point_info_t *next_image_info; 178 uint32_t image_type; 179 180 #if CTX_INCLUDE_AARCH32_REGS 181 /* 182 * Ensure that the build flag to save AArch32 system registers in CPU 183 * context is not set for AArch64-only platforms. 184 */ 185 if (el_implemented(1) == EL_IMPL_A64ONLY) { 186 ERROR("EL1 supports AArch64-only. Please set build flag " 187 "CTX_INCLUDE_AARCH32_REGS = 0\n"); 188 panic(); 189 } 190 #endif 191 192 /* Determine which image to execute next */ 193 image_type = bl31_get_next_image_type(); 194 195 /* Program EL3 registers to enable entry into the next EL */ 196 next_image_info = bl31_plat_get_next_image_ep_info(image_type); 197 assert(next_image_info != NULL); 198 assert(image_type == GET_SECURITY_STATE(next_image_info->h.attr)); 199 200 INFO("BL31: Preparing for EL3 exit to %s world\n", 201 (image_type == SECURE) ? "secure" : "normal"); 202 print_entry_point_info(next_image_info); 203 cm_init_my_context(next_image_info); 204 cm_prepare_el3_exit(image_type); 205 } 206 207 /******************************************************************************* 208 * This function initializes the pointer to BL32 init function. This is expected 209 * to be called by the SPD after it finishes all its initialization 210 ******************************************************************************/ 211 void bl31_register_bl32_init(int32_t (*func)(void)) 212 { 213 bl32_init = func; 214 } 215