e385b1074b
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2362 42af7a65-404d-4744-a932-0658087f49c3
115 lines
4.2 KiB
C
115 lines
4.2 KiB
C
/****************************************************************************
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* arch/sim/src/up_createstack.c
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*
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* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 <nuttx/arch.h>
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#include <nuttx/kmalloc.h>
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#include "up_internal.h"
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/****************************************************************************
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* Private Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_create_stack
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*
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* Description:
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* Allocate a stack for a new thread and setup
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* up stack-related information in the TCB.
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*
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* The following TCB fields must be initialized:
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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 requested stack size. At least this much
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* must be allocated.
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*
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****************************************************************************/
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int up_create_stack(_TCB *tcb, size_t stack_size)
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{
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int ret = ERROR;
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/* Move up to next even word boundary if necessary */
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size_t adj_stack_size = (stack_size + 3) & ~3;
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size_t adj_stack_words = adj_stack_size >> 2;
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/* Allocate the memory for the stack */
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uint32_t *stack_alloc_ptr = (uint32_t*)kmalloc(adj_stack_size);
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if (stack_alloc_ptr)
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{
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/* This is the address of the last word in the allocation */
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size_t *adj_stack_ptr = &stack_alloc_ptr[adj_stack_words - 1];
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/* Save the values in the TCB */
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tcb->adj_stack_size = adj_stack_size;
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tcb->stack_alloc_ptr = stack_alloc_ptr;
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tcb->adj_stack_ptr = adj_stack_ptr;
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ret = OK;
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}
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return ret;
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}
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