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/*
* Thread Handler - Stack Allocate Helper
*
* COPYRIGHT (c) 1989-2010.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/apiext.h>
#include <rtems/score/context.h>
#include <rtems/score/interr.h>
#include <rtems/score/isr.h>
#include <rtems/score/object.h>
#include <rtems/score/priority.h>
#include <rtems/score/states.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#include <rtems/score/userext.h>
#include <rtems/score/wkspace.h>
#include <rtems/config.h>
/*
* _Thread_Stack_Allocate
*
* Allocate the requested stack space for the thread.
* return the actual size allocated after any adjustment
* or return zero if the allocation failed.
* Set the Start.stack field to the address of the stack
*/
size_t _Thread_Stack_Allocate(
Thread_Control *the_thread,
size_t stack_size
)
{
void *stack_addr = 0;
size_t the_stack_size;
rtems_stack_allocate_hook stack_allocate_hook =
rtems_configuration_get_stack_allocate_hook();
the_stack_size = _Stack_Ensure_minimum( stack_size );
/*
* Pad the requested size so we allocate enough memory
* so the context initialization can align it properly. The address
* returned the workspace allocate must be directly stored in the
* stack control block because it is later used in the free sequence.
*
* Thus it is the responsibility of the CPU dependent code to
* get and keep the stack adjust factor, the stack alignment, and
* the context initialization sequence in sync.
*/
the_stack_size = _Stack_Adjust_size( the_stack_size );
stack_addr = (*stack_allocate_hook)( the_stack_size );
if ( !stack_addr )
the_stack_size = 0;
the_thread->Start.stack = stack_addr;
return the_stack_size;
}
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