1 /* 2 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <arch_helpers.h> 32 #include <assert.h> 33 #include <bl_common.h> 34 #include <context_mgmt.h> 35 #include <debug.h> 36 #include <platform.h> 37 #include "opteed_private.h" 38 39 /******************************************************************************* 40 * The target cpu is being turned on. Allow the OPTEED/OPTEE to perform any 41 * actions needed. Nothing at the moment. 42 ******************************************************************************/ 43 static void opteed_cpu_on_handler(uint64_t target_cpu) 44 { 45 } 46 47 /******************************************************************************* 48 * This cpu is being turned off. Allow the OPTEED/OPTEE to perform any actions 49 * needed 50 ******************************************************************************/ 51 static int32_t opteed_cpu_off_handler(uint64_t unused) 52 { 53 int32_t rc = 0; 54 uint64_t mpidr = read_mpidr(); 55 uint32_t linear_id = platform_get_core_pos(mpidr); 56 optee_context_t *optee_ctx = &opteed_sp_context[linear_id]; 57 58 assert(optee_vectors); 59 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON); 60 61 /* Program the entry point and enter OPTEE */ 62 cm_set_elr_el3(SECURE, (uint64_t) &optee_vectors->cpu_off_entry); 63 rc = opteed_synchronous_sp_entry(optee_ctx); 64 65 /* 66 * Read the response from OPTEE. A non-zero return means that 67 * something went wrong while communicating with OPTEE. 68 */ 69 if (rc != 0) 70 panic(); 71 72 /* 73 * Reset OPTEE's context for a fresh start when this cpu is turned on 74 * subsequently. 75 */ 76 set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_OFF); 77 78 return 0; 79 } 80 81 /******************************************************************************* 82 * This cpu is being suspended. S-EL1 state must have been saved in the 83 * resident cpu (mpidr format) if it is a UP/UP migratable OPTEE. 84 ******************************************************************************/ 85 static void opteed_cpu_suspend_handler(uint64_t unused) 86 { 87 int32_t rc = 0; 88 uint64_t mpidr = read_mpidr(); 89 uint32_t linear_id = platform_get_core_pos(mpidr); 90 optee_context_t *optee_ctx = &opteed_sp_context[linear_id]; 91 92 assert(optee_vectors); 93 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON); 94 95 /* Program the entry point and enter OPTEE */ 96 cm_set_elr_el3(SECURE, (uint64_t) &optee_vectors->cpu_suspend_entry); 97 rc = opteed_synchronous_sp_entry(optee_ctx); 98 99 /* 100 * Read the response from OPTEE. A non-zero return means that 101 * something went wrong while communicating with OPTEE. 102 */ 103 if (rc != 0) 104 panic(); 105 106 /* Update its context to reflect the state OPTEE is in */ 107 set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_SUSPEND); 108 } 109 110 /******************************************************************************* 111 * This cpu has been turned on. Enter OPTEE to initialise S-EL1 and other bits 112 * before passing control back to the Secure Monitor. Entry in S-El1 is done 113 * after initialising minimal architectural state that guarantees safe 114 * execution. 115 ******************************************************************************/ 116 static void opteed_cpu_on_finish_handler(uint64_t unused) 117 { 118 int32_t rc = 0; 119 uint64_t mpidr = read_mpidr(); 120 uint32_t linear_id = platform_get_core_pos(mpidr); 121 optee_context_t *optee_ctx = &opteed_sp_context[linear_id]; 122 entry_point_info_t optee_on_entrypoint; 123 124 assert(optee_vectors); 125 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_OFF); 126 127 opteed_init_optee_ep_state(&optee_on_entrypoint, opteed_rw, 128 (uint64_t)&optee_vectors->cpu_on_entry, 129 optee_ctx); 130 131 /* Initialise this cpu's secure context */ 132 cm_init_context(mpidr, &optee_on_entrypoint); 133 134 /* Enter OPTEE */ 135 rc = opteed_synchronous_sp_entry(optee_ctx); 136 137 /* 138 * Read the response from OPTEE. A non-zero return means that 139 * something went wrong while communicating with OPTEE. 140 */ 141 if (rc != 0) 142 panic(); 143 144 /* Update its context to reflect the state OPTEE is in */ 145 set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_ON); 146 } 147 148 /******************************************************************************* 149 * This cpu has resumed from suspend. The OPTEED saved the OPTEE context when it 150 * completed the preceding suspend call. Use that context to program an entry 151 * into OPTEE to allow it to do any remaining book keeping 152 ******************************************************************************/ 153 static void opteed_cpu_suspend_finish_handler(uint64_t suspend_level) 154 { 155 int32_t rc = 0; 156 uint64_t mpidr = read_mpidr(); 157 uint32_t linear_id = platform_get_core_pos(mpidr); 158 optee_context_t *optee_ctx = &opteed_sp_context[linear_id]; 159 160 assert(optee_vectors); 161 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_SUSPEND); 162 163 /* Program the entry point, suspend_level and enter the SP */ 164 write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx), 165 CTX_GPREG_X0, 166 suspend_level); 167 cm_set_elr_el3(SECURE, (uint64_t) &optee_vectors->cpu_resume_entry); 168 rc = opteed_synchronous_sp_entry(optee_ctx); 169 170 /* 171 * Read the response from OPTEE. A non-zero return means that 172 * something went wrong while communicating with OPTEE. 173 */ 174 if (rc != 0) 175 panic(); 176 177 /* Update its context to reflect the state OPTEE is in */ 178 set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_ON); 179 } 180 181 /******************************************************************************* 182 * Return the type of OPTEE the OPTEED is dealing with. Report the current 183 * resident cpu (mpidr format) if it is a UP/UP migratable OPTEE. 184 ******************************************************************************/ 185 static int32_t opteed_cpu_migrate_info(uint64_t *resident_cpu) 186 { 187 return OPTEE_MIGRATE_INFO; 188 } 189 190 /******************************************************************************* 191 * System is about to be switched off. Allow the OPTEED/OPTEE to perform 192 * any actions needed. 193 ******************************************************************************/ 194 static void opteed_system_off(void) 195 { 196 uint64_t mpidr = read_mpidr(); 197 uint32_t linear_id = platform_get_core_pos(mpidr); 198 optee_context_t *optee_ctx = &opteed_sp_context[linear_id]; 199 200 assert(optee_vectors); 201 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON); 202 203 /* Program the entry point */ 204 cm_set_elr_el3(SECURE, (uint64_t) &optee_vectors->system_off_entry); 205 206 /* Enter OPTEE. We do not care about the return value because we 207 * must continue the shutdown anyway */ 208 opteed_synchronous_sp_entry(optee_ctx); 209 } 210 211 /******************************************************************************* 212 * System is about to be reset. Allow the OPTEED/OPTEE to perform 213 * any actions needed. 214 ******************************************************************************/ 215 static void opteed_system_reset(void) 216 { 217 uint64_t mpidr = read_mpidr(); 218 uint32_t linear_id = platform_get_core_pos(mpidr); 219 optee_context_t *optee_ctx = &opteed_sp_context[linear_id]; 220 221 assert(optee_vectors); 222 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON); 223 224 /* Program the entry point */ 225 cm_set_elr_el3(SECURE, (uint64_t) &optee_vectors->system_reset_entry); 226 227 /* Enter OPTEE. We do not care about the return value because we 228 * must continue the reset anyway */ 229 opteed_synchronous_sp_entry(optee_ctx); 230 } 231 232 233 /******************************************************************************* 234 * Structure populated by the OPTEE Dispatcher to be given a chance to 235 * perform any OPTEE bookkeeping before PSCI executes a power mgmt. 236 * operation. 237 ******************************************************************************/ 238 const spd_pm_ops_t opteed_pm = { 239 .svc_on = opteed_cpu_on_handler, 240 .svc_off = opteed_cpu_off_handler, 241 .svc_suspend = opteed_cpu_suspend_handler, 242 .svc_on_finish = opteed_cpu_on_finish_handler, 243 .svc_suspend_finish = opteed_cpu_suspend_finish_handler, 244 .svc_migrate = NULL, 245 .svc_migrate_info = opteed_cpu_migrate_info, 246 .svc_system_off = opteed_system_off, 247 .svc_system_reset = opteed_system_reset, 248 }; 249 250