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