* arch/arm/src/sam34/sam4cm_smpcall.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <assert.h>
#include <debug.h>
#include <string.h>
#include <stdio.h>
#include <nuttx/arch.h>
#include <nuttx/spinlock.h>
#include <nuttx/sched_note.h>
#include "sched/sched.h"
#include "arm_internal.h"
#include "hardware/sam4cm_ipc.h"
#ifdef CONFIG_SMP
* Pre-processor Definitions
****************************************************************************/
#if 0
# define DPRINTF(fmt, args...) _err(fmt, ##args)
#else
# define DPRINTF(fmt, args...) do {} while (0)
#endif
* Private Data
****************************************************************************/
* Public Functions
****************************************************************************/
* Name: sam4cm_smp_call_handler
*
* Description:
* This is the handler for SMP_CALL.
*
****************************************************************************/
int sam4cm_smp_call_handler(int irq, void *c, void *arg)
{
int cpu = this_cpu();
nxsched_smp_call_handler(irq, c, arg);
if (1 == cpu)
{
DPRINTF("CPU0 -> CPU1\n");
putreg32(0x1, SAM_IPC1_ICCR);
}
else
{
DPRINTF("CPU1 -> CPU0\n");
putreg32(0x1, SAM_IPC0_ICCR);
}
nxsched_process_delivered(cpu);
return OK;
}
* Name: up_send_smp_sched
*
* Description:
* pause task execution on the CPU
* check whether there are tasks delivered to specified cpu
* and try to run them.
*
* Input Parameters:
* cpu - The index of the CPU to be paused.
*
* Returned Value:
* Zero on success; a negated errno value on failure.
*
* Assumptions:
* Called from within a critical section;
*
****************************************************************************/
int up_send_smp_sched(int cpu)
{
if (cpu == 1)
{
putreg32(0x1, SAM_IPC1_ISCR);
}
else
{
putreg32(0x1, SAM_IPC0_ISCR);
}
return OK;
}
* Name: up_send_smp_call
*
* Description:
* Send smp call to target cpu.
*
* Input Parameters:
* cpuset - The set of CPUs to receive the SGI.
*
* Returned Value:
* None.
*
****************************************************************************/
void up_send_smp_call(cpu_set_t cpuset)
{
int cpu;
for (; cpuset != 0; cpuset &= ~(1 << cpu))
{
cpu = ffs(cpuset) - 1;
up_send_smp_sched(cpu);
}
}
#endif