forked from Archive/PX4-Autopilot
111 lines
4.4 KiB
C
111 lines
4.4 KiB
C
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/************************************************************************
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* sched/kmm_kmalloc.c
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 NuttX 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 <nuttx/kmalloc.h>
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#ifdef CONFIG_NUTTX_KERNEL
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/* This logic is all tentatively and, hopefully, will grow in usability.
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* For now, the kernel-mode build uses the memory manager that is
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* provided in the user-space build. That is awkward but reasonable for
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* the current level of support: At present, only memory protection is
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* provided. Kernel-mode code may call into user-mode code, but not
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* vice-versa. So hosting the memory manager in user-space allows the
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* memory manager to be shared in both kernel- and user-mode spaces.
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*
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* In the longer run, if an MMU is support that can provide virtualized
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* memory, then some SLAB memory manager will be required in kernel-space
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* with some kind of brk() system call to obtain mapped heap space.
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*
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* In the current build model, the user-space module is built first. The
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* file user_map.h is generated in the first pass and contains the
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* addresses of the memory manager needed in this file:
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*/
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#include <arch/board/user_map.h>
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/************************************************************************
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* Pre-processor definition
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************************************************************************/
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/* This value is obtained from user_map.h */
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#define KMALLOC(s) ((kmalloc_t)CONFIG_USER_MALLOC)(s)
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/************************************************************************
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* Private Types
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************************************************************************/
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typedef FAR void *(*kmalloc_t)(size_t);
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/************************************************************************
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* Private Functions
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************************************************************************/
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/************************************************************************
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* Public Functions
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************************************************************************/
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/************************************************************************
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* Name: kmalloc
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*
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* Description:
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* This is a simple redirection to the user-space malloc() function.
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*
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* Parameters:
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* size - Size (in bytes) of the memory region to be allocated.
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*
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* Return Value:
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* The address of the allocated memory (NULL on failure to allocate)
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*
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* Assumptions:
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* 1. malloc() resides in user-space
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* 2. The address of the user space malloc() is provided in user_map.h
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* 3. The user-space malloc() is callable from kernel-space.
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*
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************************************************************************/
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FAR void *kmalloc(size_t size)
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{
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return KMALLOC(size);
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}
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#endif /* CONFIG_NUTTX_KERNEL */
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