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140 lines
5.2 KiB
140 lines
5.2 KiB
/************************************************************************ |
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* sched/kmm_semaphore.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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/* These values are obtained from user_map.h */ |
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#define KTRYSEMAPHORE() ((kmtrysemaphore_t) CONFIG_USER_MMTRYSEM )() |
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#define KGIVESEMAPHORE() ((kmgivesemaphore_t)CONFIG_USER_MMGIVESEM)() |
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/************************************************************************ |
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* Private Types |
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************************************************************************/ |
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typedef int (*kmtrysemaphore_t)(void); |
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typedef void (*kmgivesemaphore_t)(void); |
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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: kmm_trysemaphore |
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* |
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* Description: |
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* This is a simple redirection to the user-space mm_trysemaphore() |
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* function. |
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* |
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* Parameters: |
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* None |
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* |
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* Return Value: |
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* OK on success; a negated errno on failure |
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* |
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* Assumptions: |
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* 1. mm_trysemaphore() resides in user-space |
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* 2. The address of the user space mm_trysemaphore() is provided in |
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* user_map.h |
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* 3. The user-space mm_semaphore() is callable from kernel-space. |
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* |
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************************************************************************/ |
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int kmm_trysemaphore(void) |
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{ |
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return KTRYSEMAPHORE(); |
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} |
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/************************************************************************ |
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* Name: kmm_givesemaphore |
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* |
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* Description: |
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* This is a simple redirection to the user-space mm_givesemaphore() |
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* function. |
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* |
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* Parameters: |
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* None |
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* |
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* Return Value: |
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* OK on success; a negated errno on failure |
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* |
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* Assumptions: |
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* 1. mm_givesemaphore() resides in user-space |
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* 2. The address of the user space mm_givesemaphore() is provided in |
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* user_map.h |
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* 3. The user-space mm_semaphore() is callable from kernel-space. |
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* |
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************************************************************************/ |
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void kmm_givesemaphore(void) |
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{ |
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KGIVESEMAPHORE(); |
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} |
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#endif /* CONFIG_NUTTX_KERNEL */
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