/* * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of ARM nor the names of its contributors may be used * to endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include <debug.h> #include <errno.h> #include <runtime_svc.h> #include <string.h> /******************************************************************************* * The 'rt_svc_descs' array holds the runtime service descriptors exported by * services by placing them in the 'rt_svc_descs' linker section. * The 'rt_svc_descs_indices' array holds the index of a descriptor in the * 'rt_svc_descs' array. When an SMC arrives, the OEN[29:24] bits and the call * type[31] bit in the function id are combined to get an index into the * 'rt_svc_descs_indices' array. This gives the index of the descriptor in the * 'rt_svc_descs' array which contains the SMC handler. ******************************************************************************/ #define RT_SVC_DESCS_START ((uint64_t) (&__RT_SVC_DESCS_START__)) #define RT_SVC_DESCS_END ((uint64_t) (&__RT_SVC_DESCS_END__)) uint8_t rt_svc_descs_indices[MAX_RT_SVCS]; static rt_svc_desc_t *rt_svc_descs; /******************************************************************************* * Simple routine to sanity check a runtime service descriptor before using it ******************************************************************************/ static int32_t validate_rt_svc_desc(rt_svc_desc_t *desc) { if (desc == NULL) return -EINVAL; if (desc->start_oen > desc->end_oen) return -EINVAL; if (desc->end_oen >= OEN_LIMIT) return -EINVAL; if (desc->call_type != SMC_TYPE_FAST && desc->call_type != SMC_TYPE_STD) return -EINVAL; /* A runtime service having no init or handle function doesn't make sense */ if (desc->init == NULL && desc->handle == NULL) return -EINVAL; return 0; } /******************************************************************************* * This function calls the initialisation routine in the descriptor exported by * a runtime service. Once a descriptor has been validated, its start & end * owning entity numbers and the call type are combined to form a unique oen. * The unique oen is used as an index into the 'rt_svc_descs_indices' array. * The index of the runtime service descriptor is stored at this index. ******************************************************************************/ void runtime_svc_init() { int32_t rc = 0; uint32_t index, start_idx, end_idx; uint64_t rt_svc_descs_num; /* If no runtime services are implemented then simply bail out */ rt_svc_descs_num = RT_SVC_DESCS_END - RT_SVC_DESCS_START; rt_svc_descs_num /= sizeof(rt_svc_desc_t); if (rt_svc_descs_num == 0) return; /* Initialise internal variables to invalid state */ memset(rt_svc_descs_indices, -1, sizeof(rt_svc_descs_indices)); rt_svc_descs = (rt_svc_desc_t *) RT_SVC_DESCS_START; for (index = 0; index < rt_svc_descs_num; index++) { /* * An invalid descriptor is an error condition since it is * difficult to predict the system behaviour in the absence * of this service. */ rc = validate_rt_svc_desc(&rt_svc_descs[index]); if (rc) { ERROR("Invalid runtime service descriptor 0x%x (%s)\n", &rt_svc_descs[index], rt_svc_descs[index].name); goto error; } /* * The runtime service may have seperate rt_svc_desc_t * for its fast smc and standard smc. Since the service itself * need to be initialized only once, only one of them will have * an initialisation routine defined. Call the initialisation * routine for this runtime service, if it is defined. */ if (rt_svc_descs[index].init) { rc = rt_svc_descs[index].init(); if (rc) { ERROR("Error initializing runtime service %s\n", rt_svc_descs[index].name); continue; } } /* * Fill the indices corresponding to the start and end * owning entity numbers with the index of the * descriptor which will handle the SMCs for this owning * entity range. */ start_idx = get_unique_oen(rt_svc_descs[index].start_oen, rt_svc_descs[index].call_type); end_idx = get_unique_oen(rt_svc_descs[index].end_oen, rt_svc_descs[index].call_type); for (; start_idx <= end_idx; start_idx++) rt_svc_descs_indices[start_idx] = index; } return; error: panic(); }