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 <stdio.h> 32 #include <string.h> 33 #include <errno.h> 34 #include <assert.h> 35 #include <arch_helpers.h> 36 #include <console.h> 37 #include <platform.h> 38 #include <semihosting.h> 39 #include <bl_common.h> 40 #include <psci.h> 41 #include <runtime_svc.h> 42 #include <context.h> 43 #include <debug.h> 44 #include <context_mgmt.h> 45 46 /******************************************************************************* 47 * The 'rt_svc_descs' array holds the runtime service descriptors exported by 48 * services by placing them in the 'rt_svc_descs' linker section. 49 * The 'rt_svc_descs_indices' array holds the index of a descriptor in the 50 * 'rt_svc_descs' array. When an SMC arrives, the OEN[29:24] bits and the call 51 * type[31] bit in the function id are combined to get an index into the 52 * 'rt_svc_descs_indices' array. This gives the index of the descriptor in the 53 * 'rt_svc_descs' array which contains the SMC handler. 54 ******************************************************************************/ 55 #define RT_SVC_DESCS_START ((uint64_t) (&__RT_SVC_DESCS_START__)) 56 #define RT_SVC_DESCS_END ((uint64_t) (&__RT_SVC_DESCS_END__)) 57 uint8_t rt_svc_descs_indices[MAX_RT_SVCS]; 58 static rt_svc_desc *rt_svc_descs; 59 60 /******************************************************************************* 61 * Simple routine to sanity check a runtime service descriptor before using it 62 ******************************************************************************/ 63 static int32_t validate_rt_svc_desc(rt_svc_desc *desc) 64 { 65 if (desc == NULL) 66 return -EINVAL; 67 68 if (desc->start_oen > desc->end_oen) 69 return -EINVAL; 70 71 if (desc->end_oen >= OEN_LIMIT) 72 return -EINVAL; 73 74 if (desc->call_type != SMC_TYPE_FAST && desc->call_type != SMC_TYPE_STD) 75 return -EINVAL; 76 77 /* A runtime service having no init or handle function doesn't make sense */ 78 if (desc->init == NULL && desc->handle == NULL) 79 return -EINVAL; 80 81 return 0; 82 } 83 84 /******************************************************************************* 85 * This function calls the initialisation routine in the descriptor exported by 86 * a runtime service. Once a descriptor has been validated, its start & end 87 * owning entity numbers and the call type are combined to form a unique oen. 88 * The unique oen is used as an index into the 'rt_svc_descs_indices' array. 89 * The index of the runtime service descriptor is stored at this index. 90 ******************************************************************************/ 91 void runtime_svc_init() 92 { 93 int32_t rc = 0; 94 uint32_t index, start_idx, end_idx; 95 uint64_t rt_svc_descs_num; 96 97 /* If no runtime services are implemented then simply bail out */ 98 rt_svc_descs_num = RT_SVC_DESCS_END - RT_SVC_DESCS_START; 99 rt_svc_descs_num /= sizeof(rt_svc_desc); 100 if (rt_svc_descs_num == 0) 101 return; 102 103 /* Initialise internal variables to invalid state */ 104 memset(rt_svc_descs_indices, -1, sizeof(rt_svc_descs_indices)); 105 106 rt_svc_descs = (rt_svc_desc *) RT_SVC_DESCS_START; 107 for (index = 0; index < rt_svc_descs_num; index++) { 108 109 /* 110 * An invalid descriptor is an error condition since it is 111 * difficult to predict the system behaviour in the absence 112 * of this service. 113 */ 114 rc = validate_rt_svc_desc(&rt_svc_descs[index]); 115 if (rc) { 116 ERROR("Invalid runtime service descriptor 0x%x (%s)\n", 117 &rt_svc_descs[index], 118 rt_svc_descs[index].name); 119 goto error; 120 } 121 122 /* Call the initialisation routine for this runtime service */ 123 rc = rt_svc_descs[index].init(); 124 if (rc) { 125 ERROR("Error initializing runtime service %s\n", 126 rt_svc_descs[index].name); 127 } else { 128 /* 129 * Fill the indices corresponding to the start and end 130 * owning entity numbers with the index of the 131 * descriptor which will handle the SMCs for this owning 132 * entity range. 133 */ 134 start_idx = get_unique_oen(rt_svc_descs[index].start_oen, 135 rt_svc_descs[index].call_type); 136 end_idx = get_unique_oen(rt_svc_descs[index].end_oen, 137 rt_svc_descs[index].call_type); 138 139 for (; start_idx <= end_idx; start_idx++) 140 rt_svc_descs_indices[start_idx] = index; 141 } 142 } 143 144 return; 145 error: 146 panic(); 147 } 148 149 void fault_handler(void *handle) 150 { 151 gp_regs *gpregs_ctx = get_gpregs_ctx(handle); 152 ERROR("Unhandled synchronous fault. Register dump @ 0x%x \n", 153 gpregs_ctx); 154 panic(); 155 } 156