130 lines
4.8 KiB
C
130 lines
4.8 KiB
C
/****************************************************************************
|
|
* arch/sim/src/up_createstack.c
|
|
*
|
|
* Copyright (C) 2007-2009, 2013 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* 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 <stdint.h>
|
|
|
|
#include <nuttx/arch.h>
|
|
#include <nuttx/kmalloc.h>
|
|
|
|
#include "up_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor 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 by this function:
|
|
*
|
|
* - 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.
|
|
* - ttype: The thread type. This may be one of following (defined in
|
|
* include/nuttx/sched.h):
|
|
*
|
|
* TCB_FLAG_TTYPE_TASK Normal user task
|
|
* TCB_FLAG_TTYPE_PTHREAD User pthread
|
|
* TCB_FLAG_TTYPE_KERNEL Kernel thread
|
|
*
|
|
* This thread type is normally available in the flags field of the TCB,
|
|
* however, there are certain contexts where the TCB may not be fully
|
|
* initialized when up_create_stack is called.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int up_create_stack(FAR struct tcb_s *tcb, size_t stack_size, uint8_t ttype)
|
|
{
|
|
uint32_t *stack_alloc_ptr;
|
|
int 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 */
|
|
|
|
stack_alloc_ptr = (uint32_t*)kumm_malloc(adj_stack_size);
|
|
|
|
/* Was the allocation successful? */
|
|
|
|
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;
|
|
}
|