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/*
* 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(void)
{
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%lx (%s)\n",
(uintptr_t) &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();
}
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