114 lines
4.5 KiB
C
114 lines
4.5 KiB
C
/************************************************************************
|
|
* sched/kmm_addregion.c
|
|
*
|
|
* Copyright (C) 2011 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 <nuttx/kmalloc.h>
|
|
|
|
#ifdef CONFIG_NUTTX_KERNEL
|
|
|
|
/* This logic is all tentatively and, hopefully, will grow in usability.
|
|
* For now, the kernel-mode build uses the memory manager that is
|
|
* provided in the user-space build. That is awkward but reasonable for
|
|
* the current level of support: At present, only memory protection is
|
|
* provided. Kernel-mode code may call into user-mode code, but not
|
|
* vice-versa. So hosting the memory manager in user-space allows the
|
|
* memory manager to be shared in both kernel- and user-mode spaces.
|
|
*
|
|
* In the longer run, if an MMU is support that can provide virtualized
|
|
* memory, then some SLAB memory manager will be required in kernel-space
|
|
* with some kind of brk() system call to obtain mapped heap space.
|
|
*
|
|
* In the current build model, the user-space module is built first. The
|
|
* file user_map.h is generated in the first pass and contains the
|
|
* addresses of the memory manager needed in this file:
|
|
*/
|
|
|
|
#include <arch/board/user_map.h>
|
|
|
|
/************************************************************************
|
|
* Pre-processor definition
|
|
************************************************************************/
|
|
|
|
/* This value is obtained from user_map.h */
|
|
|
|
#define KADDREGION(h,s) ((kmaddregion_t)CONFIG_USER_MMADDREGION)(h,s)
|
|
|
|
/************************************************************************
|
|
* Private Types
|
|
************************************************************************/
|
|
|
|
typedef void (*kmaddregion_t)(FAR void*, size_t);
|
|
|
|
/************************************************************************
|
|
* Private Functions
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Public Functions
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Name: kmm_addregion
|
|
*
|
|
* Description:
|
|
* This is a simple redirection to the user-space mm_addregion()
|
|
* function.
|
|
*
|
|
* Parameters:
|
|
* heap_start - Address of the beginning of the memory region
|
|
* heap_size - The size (in bytes) if the memory region.
|
|
*
|
|
* Return Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* 1. mm_addregion() resides in user-space
|
|
* 2. The address of the user space mm_addregion() is provided in
|
|
* user_map.h
|
|
* 3. The user-space mm_addregion() is callable from kernel-space.
|
|
*
|
|
************************************************************************/
|
|
|
|
void kmm_addregion(FAR void *heap_start, size_t heap_size)
|
|
{
|
|
return KADDREGION(heap_start, heap_size);
|
|
}
|
|
|
|
#endif /* CONFIG_NUTTX_KERNEL */
|