1 /* 2 * Copyright (c) 2016-2024, Arm Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 #include <stddef.h> 9 #include <stdint.h> 10 #include <string.h> 11 12 #include <platform_def.h> 13 14 #include <arch.h> 15 #include <arch_helpers.h> 16 #include <common/bl_common.h> 17 #include <common/debug.h> 18 #include <common/runtime_svc.h> 19 #include <context.h> 20 #include <drivers/console.h> 21 #include <lib/el3_runtime/context_mgmt.h> 22 #include <lib/pmf/pmf.h> 23 #include <lib/psci/psci.h> 24 #include <lib/runtime_instr.h> 25 #include <lib/utils.h> 26 #include <plat/common/platform.h> 27 #include <platform_sp_min.h> 28 #include <services/std_svc.h> 29 #include <smccc_helpers.h> 30 31 #include "sp_min_private.h" 32 33 #if ENABLE_RUNTIME_INSTRUMENTATION 34 PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID, 35 RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE) 36 #endif 37 38 /* Pointers to per-core cpu contexts */ 39 static void *sp_min_cpu_ctx_ptr[PLATFORM_CORE_COUNT]; 40 41 /* SP_MIN only stores the non secure smc context */ 42 static smc_ctx_t sp_min_smc_context[PLATFORM_CORE_COUNT]; 43 44 /****************************************************************************** 45 * Define the smccc helper library APIs 46 *****************************************************************************/ 47 void *smc_get_ctx(unsigned int security_state) 48 { 49 assert(security_state == NON_SECURE); 50 return &sp_min_smc_context[plat_my_core_pos()]; 51 } 52 53 void smc_set_next_ctx(unsigned int security_state) 54 { 55 assert(security_state == NON_SECURE); 56 /* SP_MIN stores only non secure smc context. Nothing to do here */ 57 } 58 59 void *smc_get_next_ctx(void) 60 { 61 return &sp_min_smc_context[plat_my_core_pos()]; 62 } 63 64 /******************************************************************************* 65 * This function returns a pointer to the most recent 'cpu_context' structure 66 * for the calling CPU that was set as the context for the specified security 67 * state. NULL is returned if no such structure has been specified. 68 ******************************************************************************/ 69 void *cm_get_context(uint32_t security_state) 70 { 71 assert(security_state == NON_SECURE); 72 return sp_min_cpu_ctx_ptr[plat_my_core_pos()]; 73 } 74 75 /******************************************************************************* 76 * This function sets the pointer to the current 'cpu_context' structure for the 77 * specified security state for the calling CPU 78 ******************************************************************************/ 79 void cm_set_context(void *context, uint32_t security_state) 80 { 81 assert(security_state == NON_SECURE); 82 sp_min_cpu_ctx_ptr[plat_my_core_pos()] = context; 83 } 84 85 /******************************************************************************* 86 * This function returns a pointer to the most recent 'cpu_context' structure 87 * for the CPU identified by `cpu_idx` that was set as the context for the 88 * specified security state. NULL is returned if no such structure has been 89 * specified. 90 ******************************************************************************/ 91 void *cm_get_context_by_index(unsigned int cpu_idx, 92 unsigned int security_state) 93 { 94 assert(security_state == NON_SECURE); 95 return sp_min_cpu_ctx_ptr[cpu_idx]; 96 } 97 98 /******************************************************************************* 99 * This function sets the pointer to the current 'cpu_context' structure for the 100 * specified security state for the CPU identified by CPU index. 101 ******************************************************************************/ 102 void cm_set_context_by_index(unsigned int cpu_idx, void *context, 103 unsigned int security_state) 104 { 105 assert(security_state == NON_SECURE); 106 sp_min_cpu_ctx_ptr[cpu_idx] = context; 107 } 108 109 static void copy_cpu_ctx_to_smc_stx(const regs_t *cpu_reg_ctx, 110 smc_ctx_t *next_smc_ctx) 111 { 112 next_smc_ctx->r0 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R0); 113 next_smc_ctx->r1 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R1); 114 next_smc_ctx->r2 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R2); 115 next_smc_ctx->lr_mon = read_ctx_reg(cpu_reg_ctx, CTX_LR); 116 next_smc_ctx->spsr_mon = read_ctx_reg(cpu_reg_ctx, CTX_SPSR); 117 next_smc_ctx->scr = read_ctx_reg(cpu_reg_ctx, CTX_SCR); 118 } 119 120 /******************************************************************************* 121 * This function invokes the PSCI library interface to initialize the 122 * non secure cpu context and copies the relevant cpu context register values 123 * to smc context. These registers will get programmed during `smc_exit`. 124 ******************************************************************************/ 125 static void sp_min_prepare_next_image_entry(void) 126 { 127 entry_point_info_t *next_image_info; 128 cpu_context_t *ctx = cm_get_context(NON_SECURE); 129 u_register_t ns_sctlr; 130 131 /* Program system registers to proceed to non-secure */ 132 next_image_info = sp_min_plat_get_bl33_ep_info(); 133 assert(next_image_info); 134 assert(NON_SECURE == GET_SECURITY_STATE(next_image_info->h.attr)); 135 136 INFO("SP_MIN: Preparing exit to normal world\n"); 137 print_entry_point_info(next_image_info); 138 139 psci_prepare_next_non_secure_ctx(next_image_info); 140 smc_set_next_ctx(NON_SECURE); 141 142 /* Copy r0, lr and spsr from cpu context to SMC context */ 143 copy_cpu_ctx_to_smc_stx(get_regs_ctx(cm_get_context(NON_SECURE)), 144 smc_get_next_ctx()); 145 146 /* Temporarily set the NS bit to access NS SCTLR */ 147 write_scr(read_scr() | SCR_NS_BIT); 148 isb(); 149 ns_sctlr = read_ctx_reg(get_regs_ctx(ctx), CTX_NS_SCTLR); 150 write_sctlr(ns_sctlr); 151 isb(); 152 153 write_scr(read_scr() & ~SCR_NS_BIT); 154 isb(); 155 } 156 157 /****************************************************************************** 158 * Implement the ARM Standard Service function to get arguments for a 159 * particular service. 160 *****************************************************************************/ 161 uintptr_t get_arm_std_svc_args(unsigned int svc_mask) 162 { 163 /* Setup the arguments for PSCI Library */ 164 DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, sp_min_warm_entrypoint); 165 166 /* PSCI is the only ARM Standard Service implemented */ 167 assert(svc_mask == PSCI_FID_MASK); 168 169 return (uintptr_t)&psci_args; 170 } 171 172 /****************************************************************************** 173 * The SP_MIN setup function. Calls platforms init functions 174 *****************************************************************************/ 175 void sp_min_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 176 u_register_t arg3) 177 { 178 /* Perform early platform-specific setup */ 179 sp_min_early_platform_setup2(arg0, arg1, arg2, arg3); 180 sp_min_plat_arch_setup(); 181 } 182 183 /****************************************************************************** 184 * The SP_MIN main function. Do the platform and PSCI Library setup. Also 185 * initialize the runtime service framework. 186 *****************************************************************************/ 187 void sp_min_main(void) 188 { 189 NOTICE("SP_MIN: %s\n", version_string); 190 NOTICE("SP_MIN: %s\n", build_message); 191 192 /* Perform the SP_MIN platform setup */ 193 sp_min_platform_setup(); 194 195 /* Initialize the runtime services e.g. psci */ 196 INFO("SP_MIN: Initializing runtime services\n"); 197 runtime_svc_init(); 198 199 /* 200 * We are ready to enter the next EL. Prepare entry into the image 201 * corresponding to the desired security state after the next ERET. 202 */ 203 sp_min_prepare_next_image_entry(); 204 205 /* 206 * Perform any platform specific runtime setup prior to cold boot exit 207 * from SP_MIN. 208 */ 209 sp_min_plat_runtime_setup(); 210 211 console_flush(); 212 } 213 214 /****************************************************************************** 215 * This function is invoked during warm boot. Invoke the PSCI library 216 * warm boot entry point which takes care of Architectural and platform setup/ 217 * restore. Copy the relevant cpu_context register values to smc context which 218 * will get programmed during `smc_exit`. 219 *****************************************************************************/ 220 void sp_min_warm_boot(void) 221 { 222 smc_ctx_t *next_smc_ctx; 223 cpu_context_t *ctx = cm_get_context(NON_SECURE); 224 u_register_t ns_sctlr; 225 226 psci_warmboot_entrypoint(); 227 228 smc_set_next_ctx(NON_SECURE); 229 230 next_smc_ctx = smc_get_next_ctx(); 231 zeromem(next_smc_ctx, sizeof(smc_ctx_t)); 232 233 copy_cpu_ctx_to_smc_stx(get_regs_ctx(cm_get_context(NON_SECURE)), 234 next_smc_ctx); 235 236 /* Temporarily set the NS bit to access NS SCTLR */ 237 write_scr(read_scr() | SCR_NS_BIT); 238 isb(); 239 ns_sctlr = read_ctx_reg(get_regs_ctx(ctx), CTX_NS_SCTLR); 240 write_sctlr(ns_sctlr); 241 isb(); 242 243 write_scr(read_scr() & ~SCR_NS_BIT); 244 isb(); 245 } 246 247 #if SP_MIN_WITH_SECURE_FIQ 248 /****************************************************************************** 249 * This function is invoked on secure interrupts. By construction of the 250 * SP_MIN, secure interrupts can only be handled when core executes in non 251 * secure state. 252 *****************************************************************************/ 253 void sp_min_fiq(void) 254 { 255 uint32_t id; 256 257 id = plat_ic_acknowledge_interrupt(); 258 sp_min_plat_fiq_handler(id); 259 plat_ic_end_of_interrupt(id); 260 } 261 #endif /* SP_MIN_WITH_SECURE_FIQ */ 262