/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScoreStack
*
* @brief This header file provides interfaces of the
* @ref RTEMSScoreStack which are used by the implementation and the
* @ref RTEMSImplApplConfig.
*/
/*
* COPYRIGHT (c) 1989-2006.
* On-Line Applications Research Corporation (OAR).
*
* 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.
*
* 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.
*/
#ifndef _RTEMS_SCORE_STACK_H
#define _RTEMS_SCORE_STACK_H
#include <rtems/score/basedefs.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup RTEMSScoreStack Stack Handler
*
* @ingroup RTEMSScore
*
* @brief This group contains the Stack Handler implementation.
*
* This handler encapsulates functionality which is used in the management
* of thread stacks. It provides mechanisms which can be used to initialize
* and utilize stacks.
*
* @{
*/
/**
* The following constant defines the minimum stack size which every
* thread must exceed.
*/
#define STACK_MINIMUM_SIZE CPU_STACK_MINIMUM_SIZE
/**
* The following defines the control block used to manage each stack.
*/
typedef struct {
/** This is the stack size. */
size_t size;
/** This is the low memory address of stack. */
void *area;
} Stack_Control;
/**
* @brief The stack allocator initialization handler.
*
* @param stack_space_size The size of the stack space in bytes.
*/
typedef void ( *Stack_Allocator_initialize )( size_t stack_space_size );
/**
* @brief Stack allocator allocate handler.
*
* @param stack_size The size of the stack area to allocate in bytes.
*
* @retval NULL Not enough memory.
* @retval other Pointer to begin of stack area.
*/
typedef void *( *Stack_Allocator_allocate )( size_t stack_size );
/**
* @brief Stack allocator free handler.
*
* @param] addr A pointer to previously allocated stack area or NULL.
*/
typedef void ( *Stack_Allocator_free )( void *addr );
/**
* @brief Stack allocator allocate for idle handler.
*
* The allocate for idle handler is optional even when the user thread stack
* allocator and deallocator are configured.
*
* @param cpu Index of the CPU for the IDLE thread using this stack
* @param stack_size The size of the stack area to allocate in bytes.
*
* @retval NULL Not enough memory.
* @retval other Pointer to begin of stack area.
*/
typedef void *( *Stack_Allocator_allocate_for_idle )(
uint32_t cpu,
size_t stack_size
);
/**
* @brief The minimum stack size.
*
* Application provided via <rtems/confdefs.h>.
*/
extern uint32_t rtems_minimum_stack_size;
/**
* @brief The configured stack space size.
*
* Application provided via <rtems/confdefs.h>.
*/
extern const uintptr_t _Stack_Space_size;
/**
* @brief Indicates if the stack allocator avoids the workspace.
*
* Application provided via <rtems/confdefs.h>.
*/
extern const bool _Stack_Allocator_avoids_workspace;
/**
* @brief The stack allocator initialization handler.
*
* Application provided via <rtems/confdefs.h>.
*/
extern const Stack_Allocator_initialize _Stack_Allocator_initialize;
/**
* @brief The stack allocator allocate handler.
*
* Application provided via <rtems/confdefs.h>.
*/
extern const Stack_Allocator_allocate _Stack_Allocator_allocate;
/**
* @brief The stack allocator free handler.
*
* Application provided via <rtems/confdefs.h>.
*/
extern const Stack_Allocator_free _Stack_Allocator_free;
/**
* @brief Do the stack allocator initialization during system initialize.
*
* This function is used to initialize application provided stack allocators.
*/
void _Stack_Allocator_do_initialize( void );
/** @} */
/**
* @brief The stack allocator allocate stack for idle thread handler.
*
* Application provided via <rtems/confdefs.h>.
*/
extern const Stack_Allocator_allocate_for_idle
_Stack_Allocator_allocate_for_idle;
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
