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/****************************************************************************
* up_createstack.c
*
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name NuttX 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 OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include "up_internal.h"
/****************************************************************************
* Private Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_create_stack
*
* Description:
* Allocate a stack for a new thread and setup
* up stack-related information in the TCB.
*
* The following TCB fields must be initialized:
* adj_stack_size: Stack size after adjustment for hardware,
* processor, etc. This value is retained only for debug
* purposes.
* stack_alloc_ptr: Pointer to allocated stack
* adj_stack_ptr: Adjusted stack_alloc_ptr for HW. The
* initial value of the stack pointer.
*
* Inputs:
* tcb: The TCB of new task
* stack_size: The requested stack size. At least this much
* must be allocated.
*
****************************************************************************/
STATUS up_create_stack(_TCB *tcb, size_t stack_size)
{
STATUS ret = ERROR;
/* Move up to next even word boundary if necessary */
size_t adj_stack_size = (stack_size + 3) & ~3;
size_t adj_stack_words = adj_stack_size >> 2;
/* Allocate the memory for the stack */
uint32 *stack_alloc_ptr = (uint32*)kmalloc(adj_stack_size);
if (stack_alloc_ptr)
{
/* This is the address of the last word in the allocation */
size_t *adj_stack_ptr = &stack_alloc_ptr[adj_stack_words - 1];
/* Save the values in the TCB */
tcb->adj_stack_size = adj_stack_size;
tcb->stack_alloc_ptr = stack_alloc_ptr;
tcb->adj_stack_ptr = adj_stack_ptr;
ret = OK;
}
return ret;
}
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