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/*
* Copyright (c) 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 <arch_helpers.h>
#include <assert.h>
#include <debug.h>
#include <gic_v2.h>
#include <tsp.h>
#include <platform.h>
/*******************************************************************************
* This function updates the TSP statistics for FIQs handled synchronously i.e
* the ones that have been handed over by the TSPD. It also keeps count of the
* number of times control was passed back to the TSPD after handling an FIQ.
* In the future it will be possible that the TSPD hands over an FIQ to the TSP
* but does not expect it to return execution. This statistic will be useful to
* distinguish between these two models of synchronous FIQ handling.
* The 'elr_el3' parameter contains the address of the instruction in normal
* world where this FIQ was generated.
******************************************************************************/
void tsp_update_sync_fiq_stats(uint32_t type, uint64_t elr_el3)
{
uint64_t mpidr = read_mpidr();
uint32_t linear_id = platform_get_core_pos(mpidr);
tsp_stats[linear_id].sync_fiq_count++;
if (type == TSP_HANDLE_FIQ_AND_RETURN)
tsp_stats[linear_id].sync_fiq_ret_count++;
spin_lock(&console_lock);
printf("TSP: cpu 0x%x sync fiq request from 0x%llx \n\r",
mpidr, elr_el3);
INFO("cpu 0x%x: %d sync fiq requests, %d sync fiq returns\n",
mpidr,
tsp_stats[linear_id].sync_fiq_count,
tsp_stats[linear_id].sync_fiq_ret_count);
spin_unlock(&console_lock);
}
/*******************************************************************************
* TSP FIQ handler called as a part of both synchronous and asynchronous
* handling of FIQ interrupts. It returns 0 upon successfully handling a S-EL1
* FIQ and treats all other FIQs as EL3 interrupts. It assumes that the GIC
* architecture version in v2.0 and the secure physical timer interrupt is the
* only S-EL1 interrupt that it needs to handle.
******************************************************************************/
int32_t tsp_fiq_handler()
{
uint64_t mpidr = read_mpidr();
uint32_t linear_id = platform_get_core_pos(mpidr), id;
/*
* Get the highest priority pending interrupt id and see if it is the
* secure physical generic timer interrupt in which case, handle it.
* Otherwise throw this interrupt at the EL3 firmware.
*/
id = ic_get_pending_interrupt_id();
/* TSP can only handle the secure physical timer interrupt */
if (id != IRQ_SEC_PHY_TIMER)
return TSP_EL3_FIQ;
/*
* Handle the interrupt. Also sanity check if it has been preempted by
* another secure interrupt through an assertion.
*/
id = ic_acknowledge_interrupt();
assert(id == IRQ_SEC_PHY_TIMER);
tsp_generic_timer_handler();
ic_end_of_interrupt(id);
/* Update the statistics and print some messages */
tsp_stats[linear_id].fiq_count++;
spin_lock(&console_lock);
printf("TSP: cpu 0x%x handled fiq %d \n\r",
mpidr, id);
INFO("cpu 0x%x: %d fiq requests \n",
mpidr, tsp_stats[linear_id].fiq_count);
spin_unlock(&console_lock);
return 0;
}