1 /* 2 * Copyright (c) 2016-2019, 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"); 137 138 psci_prepare_next_non_secure_ctx(next_image_info); 139 smc_set_next_ctx(NON_SECURE); 140 141 /* Copy r0, lr and spsr from cpu context to SMC context */ 142 copy_cpu_ctx_to_smc_stx(get_regs_ctx(cm_get_context(NON_SECURE)), 143 smc_get_next_ctx()); 144 145 /* Temporarily set the NS bit to access NS SCTLR */ 146 write_scr(read_scr() | SCR_NS_BIT); 147 isb(); 148 ns_sctlr = read_ctx_reg(get_regs_ctx(ctx), CTX_NS_SCTLR); 149 write_sctlr(ns_sctlr); 150 isb(); 151 152 write_scr(read_scr() & ~SCR_NS_BIT); 153 isb(); 154 } 155 156 /****************************************************************************** 157 * Implement the ARM Standard Service function to get arguments for a 158 * particular service. 159 *****************************************************************************/ 160 uintptr_t get_arm_std_svc_args(unsigned int svc_mask) 161 { 162 /* Setup the arguments for PSCI Library */ 163 DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, sp_min_warm_entrypoint); 164 165 /* PSCI is the only ARM Standard Service implemented */ 166 assert(svc_mask == PSCI_FID_MASK); 167 168 return (uintptr_t)&psci_args; 169 } 170 171 /****************************************************************************** 172 * The SP_MIN main function. Do the platform and PSCI Library setup. Also 173 * initialize the runtime service framework. 174 *****************************************************************************/ 175 void sp_min_main(void) 176 { 177 NOTICE("SP_MIN: %s\n", version_string); 178 NOTICE("SP_MIN: %s\n", build_message); 179 180 /* Perform the SP_MIN platform setup */ 181 sp_min_platform_setup(); 182 183 /* Initialize the runtime services e.g. psci */ 184 INFO("SP_MIN: Initializing runtime services\n"); 185 runtime_svc_init(); 186 187 /* 188 * We are ready to enter the next EL. Prepare entry into the image 189 * corresponding to the desired security state after the next ERET. 190 */ 191 sp_min_prepare_next_image_entry(); 192 193 /* 194 * Perform any platform specific runtime setup prior to cold boot exit 195 * from SP_MIN. 196 */ 197 sp_min_plat_runtime_setup(); 198 199 console_flush(); 200 } 201 202 /****************************************************************************** 203 * This function is invoked during warm boot. Invoke the PSCI library 204 * warm boot entry point which takes care of Architectural and platform setup/ 205 * restore. Copy the relevant cpu_context register values to smc context which 206 * will get programmed during `smc_exit`. 207 *****************************************************************************/ 208 void sp_min_warm_boot(void) 209 { 210 smc_ctx_t *next_smc_ctx; 211 cpu_context_t *ctx = cm_get_context(NON_SECURE); 212 u_register_t ns_sctlr; 213 214 psci_warmboot_entrypoint(); 215 216 smc_set_next_ctx(NON_SECURE); 217 218 next_smc_ctx = smc_get_next_ctx(); 219 zeromem(next_smc_ctx, sizeof(smc_ctx_t)); 220 221 copy_cpu_ctx_to_smc_stx(get_regs_ctx(cm_get_context(NON_SECURE)), 222 next_smc_ctx); 223 224 /* Temporarily set the NS bit to access NS SCTLR */ 225 write_scr(read_scr() | SCR_NS_BIT); 226 isb(); 227 ns_sctlr = read_ctx_reg(get_regs_ctx(ctx), CTX_NS_SCTLR); 228 write_sctlr(ns_sctlr); 229 isb(); 230 231 write_scr(read_scr() & ~SCR_NS_BIT); 232 isb(); 233 } 234 235 #if SP_MIN_WITH_SECURE_FIQ 236 /****************************************************************************** 237 * This function is invoked on secure interrupts. By construction of the 238 * SP_MIN, secure interrupts can only be handled when core executes in non 239 * secure state. 240 *****************************************************************************/ 241 void sp_min_fiq(void) 242 { 243 uint32_t id; 244 245 id = plat_ic_acknowledge_interrupt(); 246 sp_min_plat_fiq_handler(id); 247 plat_ic_end_of_interrupt(id); 248 } 249 #endif /* SP_MIN_WITH_SECURE_FIQ */ 250