133 lines
4.8 KiB
C
133 lines
4.8 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-a/arm_cpuidlestack.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <nuttx/arch.h>
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#include <nuttx/sched.h>
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#include "smp.h"
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#include "arm_internal.h"
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#ifdef CONFIG_SMP
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Stack alignment macros */
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#define STACK_ISALIGNED(a) ((uintptr_t)(a) & ~SMP_STACK_MASK)
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/****************************************************************************
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* Private Data
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****************************************************************************/
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#if CONFIG_SMP_NCPUS > 1
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static const uint32_t *g_cpu_stackalloc[CONFIG_SMP_NCPUS] =
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{
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0
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, g_cpu1_idlestack
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#if CONFIG_SMP_NCPUS > 2
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, g_cpu2_idlestack
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#if CONFIG_SMP_NCPUS > 3
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, g_cpu3_idlestack
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#endif /* CONFIG_SMP_NCPUS > 3 */
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#endif /* CONFIG_SMP_NCPUS > 2 */
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};
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_cpu_idlestack
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*
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* Description:
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* Allocate a stack for the CPU[n] IDLE task (n > 0) if appropriate and
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* setup up stack-related information in the IDLE task's TCB. This
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* function is always called before up_cpu_start(). This function is
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* only called for the CPU's initial IDLE task; up_create_task is used for
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* all normal tasks, pthreads, and kernel threads for all CPUs.
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*
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* The initial IDLE task is a special case because the CPUs can be started
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* in different wans in different environments:
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*
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* 1. The CPU may already have been started and waiting in a low power
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* state for up_cpu_start(). In this case, the IDLE thread's stack
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* has already been allocated and is already in use. Here
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* up_cpu_idlestack() only has to provide information about the
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* already allocated stack.
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*
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* 2. The CPU may be disabled but started when up_cpu_start() is called.
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* In this case, a new stack will need to be created for the IDLE
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* thread and this function is then equivalent to:
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*
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* return up_create_stack(tcb, stack_size, TCB_FLAG_TTYPE_KERNEL);
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*
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* The following TCB fields must be initialized by this function:
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*
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* - adj_stack_size: Stack size after adjustment for hardware, processor,
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* etc. This value is retained only for debug purposes.
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* - stack_alloc_ptr: Pointer to allocated stack
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* - stack_base_ptr: Adjusted stack base pointer after the TLS Data and
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* Arguments has been removed from the stack allocation.
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*
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* Input Parameters:
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* - cpu: CPU index that indicates which CPU the IDLE task is
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* being created for.
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* - tcb: The TCB of new CPU IDLE task
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* - stack_size: The requested stack size for the IDLE task. At least
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* this much must be allocated. This should be
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* CONFIG_SMP_STACK_SIZE.
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*
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****************************************************************************/
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int up_cpu_idlestack(int cpu, struct tcb_s *tcb, size_t stack_size)
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{
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#if CONFIG_SMP_NCPUS > 1
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uintptr_t stack_alloc;
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DEBUGASSERT(cpu > 0 && cpu < CONFIG_SMP_NCPUS && tcb != NULL &&
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stack_size <= SMP_STACK_SIZE);
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/* Get the top of the stack */
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stack_alloc = (uintptr_t)g_cpu_stackalloc[cpu];
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DEBUGASSERT(stack_alloc != 0 && STACK_ISALIGNED(stack_alloc));
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tcb->adj_stack_size = SMP_STACK_SIZE;
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tcb->stack_alloc_ptr = (void *)stack_alloc;
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tcb->stack_base_ptr = tcb->stack_alloc_ptr;
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#endif
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return OK;
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}
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#endif /* CONFIG_SMP */
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