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Diffstat (limited to '')
-rw-r--r-- | c/src/lib/libbsp/powerpc/psim/shmsupp/lock.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/psim/shmsupp/lock.c b/c/src/lib/libbsp/powerpc/psim/shmsupp/lock.c new file mode 100644 index 0000000000..56a1087e53 --- /dev/null +++ b/c/src/lib/libbsp/powerpc/psim/shmsupp/lock.c @@ -0,0 +1,69 @@ +/* Shared Memory Lock Routines + * + * This shared memory locked queue support routine need to be + * able to lock the specified locked queue. Interrupts are + * disabled while the queue is locked to prevent preemption + * and deadlock when two tasks poll for the same lock. + * previous level. + * + * COPYRIGHT (c) 1989-1997. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may in + * the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include <rtems.h> +#include <bsp.h> +#include <shm.h> + +typedef volatile unsigned int volint; + +/* + * Shm_Initialize_lock + * + * Initialize the lock for the specified locked queue. + */ + +void Shm_Initialize_lock( + Shm_Locked_queue_Control *lq_cb +) +{ + /* nothing required -- done implicitly by device tree */ +} + +/* void _Shm_Lock( &lq_cb ) + * + * This shared memory locked queue support routine locks the + * specified locked queue. It disables interrupts to prevent + * a deadlock condition. + */ + +void Shm_Lock( + Shm_Locked_queue_Control *lq_cb +) +{ + volint *p = (volint *)0xc0010000; + + (void) p[1]; +} + +/* + * Shm_Unlock + * + * Unlock the lock for the specified locked queue. + */ + +void Shm_Unlock( + Shm_Locked_queue_Control *lq_cb +) +{ + volint *p = (volint *)0xc0010000; + + (void) p[2]; +} + |