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 32 /******************************************************************************* 33 * This is the Secure Payload Dispatcher (SPD). The dispatcher is meant to be a 34 * plug-in component to the Secure Monitor, registered as a runtime service. The 35 * SPD is expected to be a functional extension of the Secure Payload (SP) that 36 * executes in Secure EL1. The Secure Monitor will delegate all SMCs targeting 37 * the Trusted OS/Applications range to the dispatcher. The SPD will either 38 * handle the request locally or delegate it to the Secure Payload. It is also 39 * responsible for initialising and maintaining communication with the SP. 40 ******************************************************************************/ 41 #include <stdio.h> 42 #include <string.h> 43 #include <assert.h> 44 #include <arch_helpers.h> 45 #include <console.h> 46 #include <platform.h> 47 #include <psci_private.h> 48 #include <context_mgmt.h> 49 #include <runtime_svc.h> 50 #include <bl31.h> 51 #include <tsp.h> 52 #include <psci.h> 53 #include <tspd_private.h> 54 #include <debug.h> 55 56 /******************************************************************************* 57 * Single structure to hold information about the various entry points into the 58 * Secure Payload. It is initialised once on the primary core after a cold boot. 59 ******************************************************************************/ 60 entry_info *tsp_entry_info; 61 62 /******************************************************************************* 63 * Array to keep track of per-cpu Secure Payload state 64 ******************************************************************************/ 65 tsp_context tspd_sp_context[TSPD_CORE_COUNT]; 66 67 /******************************************************************************* 68 * Secure Payload Dispatcher setup. The SPD finds out the SP entrypoint and type 69 * (aarch32/aarch64) if not already known and initialises the context for entry 70 * into the SP for its initialisation. 71 ******************************************************************************/ 72 int32_t tspd_setup(void) 73 { 74 el_change_info *image_info; 75 int32_t rc; 76 uint64_t mpidr = read_mpidr(); 77 uint32_t linear_id; 78 79 linear_id = platform_get_core_pos(mpidr); 80 81 /* 82 * Get information about the Secure Payload (BL32) image. Its 83 * absence is a critical failure. TODO: Add support to 84 * conditionally include the SPD service 85 */ 86 image_info = bl31_get_next_image_info(SECURE); 87 assert(image_info); 88 89 /* 90 * We could inspect the SP image and determine it's execution 91 * state i.e whether AArch32 or AArch64. Assuming it's AArch64 92 * for the time being. 93 */ 94 rc = tspd_init_secure_context(image_info->entrypoint, 95 TSP_AARCH64, 96 mpidr, 97 &tspd_sp_context[linear_id]); 98 assert(rc == 0); 99 100 return rc; 101 } 102 103 /******************************************************************************* 104 * This function passes control to the Secure Payload image (BL32) for the first 105 * time on the primary cpu after a cold boot. It assumes that a valid secure 106 * context has already been created by tspd_setup() which can be directly used. 107 * It also assumes that a valid non-secure context has been initialised by PSCI 108 * so it does not need to save and restore any non-secure state. This function 109 * performs a synchronous entry into the Secure payload. The SP passes control 110 * back to this routine through a SMC. It also passes the extents of memory made 111 * available to BL32 by BL31. 112 ******************************************************************************/ 113 int32_t bl32_init(meminfo *bl32_meminfo) 114 { 115 uint64_t mpidr = read_mpidr(); 116 uint32_t linear_id = platform_get_core_pos(mpidr); 117 uint64_t rc; 118 tsp_context *tsp_ctx = &tspd_sp_context[linear_id]; 119 120 /* 121 * Arrange for passing a pointer to the meminfo structure 122 * describing the memory extents available to the secure 123 * payload. 124 * TODO: We are passing a pointer to BL31 internal memory 125 * whereas this structure should be copied to a communication 126 * buffer between the SP and SPD. 127 */ 128 write_ctx_reg(get_gpregs_ctx(&tsp_ctx->cpu_ctx), 129 CTX_GPREG_X0, 130 (uint64_t) bl32_meminfo); 131 132 /* Arrange for an entry into the secure payload */ 133 rc = tspd_synchronous_sp_entry(tsp_ctx); 134 assert(rc != 0); 135 if (rc) 136 tsp_ctx->state = TSP_STATE_ON; 137 138 return rc; 139 } 140 141 /******************************************************************************* 142 * This function is responsible for handling all SMCs in the Trusted OS/App 143 * range from the non-secure state as defined in the SMC Calling Convention 144 * Document. It is also responsible for communicating with the Secure payload 145 * to delegate work and return results back to the non-secure state. Lastly it 146 * will also return any information that the secure payload needs to do the 147 * work assigned to it. 148 ******************************************************************************/ 149 uint64_t tspd_smc_handler(uint32_t smc_fid, 150 uint64_t x1, 151 uint64_t x2, 152 uint64_t x3, 153 uint64_t x4, 154 void *cookie, 155 void *handle, 156 uint64_t flags) 157 { 158 unsigned long mpidr = read_mpidr(); 159 uint32_t linear_id = platform_get_core_pos(mpidr), ns; 160 161 /* Determine which security state this SMC originated from */ 162 ns = is_caller_non_secure(flags); 163 164 switch (smc_fid) { 165 166 /* 167 * This function ID is used only by the SP to indicate it has 168 * finished initialising itself after a cold boot 169 */ 170 case TSP_ENTRY_DONE: 171 if (ns) 172 SMC_RET1(handle, SMC_UNK); 173 174 /* 175 * Stash the SP entry points information. This is done 176 * only once on the primary cpu 177 */ 178 assert(tsp_entry_info == NULL); 179 tsp_entry_info = (entry_info *) x1; 180 181 /* 182 * SP reports completion. The SPD must have initiated 183 * the original request through a synchronous entry 184 * into the SP. Jump back to the original C runtime 185 * context. 186 */ 187 tspd_synchronous_sp_exit(&tspd_sp_context[linear_id], x1); 188 189 /* Should never reach here */ 190 assert(0); 191 192 default: 193 panic(); 194 } 195 196 SMC_RET1(handle, 0); 197 } 198 199 /* Define a SPD runtime service descriptor */ 200 DECLARE_RT_SVC( 201 spd, 202 203 OEN_TOS_START, 204 OEN_TOS_END, 205 SMC_TYPE_FAST, 206 tspd_setup, 207 tspd_smc_handler 208 ); 209