forked from Imagelibrary/rtems
88 lines
3.2 KiB
C
88 lines
3.2 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/* Private driver manager declarations
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*
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* COPYRIGHT (c) 2009 Cobham Gaisler AB.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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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#include <rtems/score/apimutex.h>
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/* Structure hold all information the driver manager needs to know of. Used
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* internally by Driver Manager routines.
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*/
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struct drvmgr {
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int level;
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int initializing_objs;
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/* Device tree Lock */
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API_Mutex_Control lock;
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/* The first device - The root device and it's driver */
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struct drvmgr_drv *root_drv;
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struct drvmgr_dev root_dev;
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/*!< Linked list of all registered drivers */
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struct drvmgr_list drivers;
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/* Buses that reached a certain initialization level.
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* Lists by Level:
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* N=0 - Not intialized, just registered
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* N=1..MAX-1 - Reached init level N
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* N=MAX - Successfully initialized bus
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*/
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struct drvmgr_list buses[DRVMGR_LEVEL_MAX+1];
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/* Buses failed to initialize or has been removed by not freed */
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struct drvmgr_list buses_inactive;
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/* Devices that reached a certain initialization level.
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* Lists by Level:
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* N=0 - Not intialized, just registered
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* N=1..MAX-1 - Reached init level N
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* N=MAX - Successfully initialized device
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*/
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struct drvmgr_list devices[DRVMGR_LEVEL_MAX+1];
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/*!< Devices failed to initialize, removed, ignored, no driver */
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struct drvmgr_list devices_inactive;
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};
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extern struct drvmgr drvmgr;
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extern void _DRV_Manager_Lock(void);
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extern void _DRV_Manager_Unlock(void);
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/* The best solution is to implement the locking with a RW lock, however there
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* is no such API available. Care must be taken so that dead-lock isn't created
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* for example in recursive functions.
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*/
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#if defined(DRVMGR_USE_LOCKS) && (DRVMGR_USE_LOCKS == 1)
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#define DRVMGR_LOCK_WRITE() _DRV_Manager_Lock()
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#define DRVMGR_LOCK_READ() _DRV_Manager_Lock()
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#define DRVMGR_UNLOCK() _DRV_Manager_Unlock()
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#else
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/* no locking */
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#define DRVMGR_LOCK_WRITE()
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#define DRVMGR_LOCK_READ()
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#define DRVMGR_UNLOCK()
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#endif
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