c86f502f2e
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5766 42af7a65-404d-4744-a932-0658087f49c3
132 lines
4.9 KiB
C
132 lines
4.9 KiB
C
/****************************************************************************
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* arch/hc/src/common/up_usestack.c
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*
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* Copyright (C) 2009, 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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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 <stdint.h>
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#include <sched.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/arch.h>
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#include "up_internal.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_use_stack
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*
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* Description:
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* Setup up stack-related information in the TCB using pre-allocated stack
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* memory. This function is called only from task_init() when a task or
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* kernel thread is started (never for pthreads).
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*
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* The following TCB fields must be initialized:
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*
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* - adj_stack_size: Stack size after adjustment for hardware,
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* processor, etc. This value is retained only for debug
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* purposes.
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* - stack_alloc_ptr: Pointer to allocated stack
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* - adj_stack_ptr: Adjusted stack_alloc_ptr for HW. The
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* initial value of the stack pointer.
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*
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* Inputs:
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* - tcb: The TCB of new task
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* - stack_size: The allocated stack size.
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*
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* NOTE: Unlike up_stack_create() and up_stack_release, this function
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* does not require the task type (ttype) parameter. The TCB flags will
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* always be set to provide the task type to up_use_stack() if it needs
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* that information.
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*
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****************************************************************************/
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int up_use_stack(struct tcb_s *tcb, void *stack, size_t stack_size)
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{
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size_t top_of_stack;
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size_t size_of_stack;
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/* Is there already a stack allocated? */
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if (tcb->stack_alloc_ptr && tcb->adj_stack_size != stack_size)
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{
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/* Yes.. Release the old stack allocation */
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up_release_stack(tcb, tcb->flags & TCB_FLAG_TTYPE_MASK);
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}
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/* Save the new stack allocation */
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tcb->stack_alloc_ptr = stack;
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/* The CPU12 uses a push-down stack: the stack grows
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* toward lower addresses in memory. Because the CPU12 stack
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* operates as a decrement then store stack, the value assigned
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* to the initial stack pointer is one more than the last valid
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* stack address.
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*/
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top_of_stack = (size_t)tcb->stack_alloc_ptr + stack_size;
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/* The CPU12 stack should be aligned at half-word (2 byte)
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* boundaries. If necessary top_of_stack must be rounded
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* down to the next boundary
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*/
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top_of_stack &= ~1;
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size_of_stack = top_of_stack - (size_t)tcb->stack_alloc_ptr;
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/* Save the adjusted stack values in the struct tcb_s */
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tcb->adj_stack_ptr = (uint32_t*)top_of_stack;
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tcb->adj_stack_size = size_of_stack;
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return OK;
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}
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