119 lines
4.1 KiB
C
119 lines
4.1 KiB
C
/************************************************************
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* up_usestack.c
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*
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* Copyright (C) 2007 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 Gregory Nutt 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 <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
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* using pre-allocated stack memory
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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 StatckAllocPtr 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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************************************************************/
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STATUS up_use_stack(_TCB *tcb, uint32 *stack, uint32 stack_size)
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{
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uint32 top_of_stack;
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uint32 size_of_stack;
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if (tcb->stack_alloc_ptr)
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{
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sched_free(tcb->stack_alloc_ptr);
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}
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/* Save the stack allocation */
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tcb->stack_alloc_ptr = stack;
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/* The Arm7Tdmi uses a push-down stack: the stack grows
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* toward loweraddresses in memory. The stack pointer
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* register, points to the lowest, valid work address
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* (the "top" of the stack). Items on the stack are
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* referenced as positive word offsets from sp.
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*/
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top_of_stack = (uint32)tcb->stack_alloc_ptr + stack_size - 4;
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/* The Arm7Tdmi stack must be aligned at word (4 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 &= ~3;
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size_of_stack = top_of_stack - (uint32)tcb->stack_alloc_ptr + 4;
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/* Save the adjusted stack values in the _TCB */
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tcb->adj_stack_size = 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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