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Diffstat (limited to '')
-rw-r--r-- | c/src/lib/libcpu/a29k/timer/timerisr.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/a29k/timer/timerisr.c b/c/src/lib/libcpu/a29k/timer/timerisr.c new file mode 100644 index 0000000000..82c3c80d9f --- /dev/null +++ b/c/src/lib/libcpu/a29k/timer/timerisr.c @@ -0,0 +1,41 @@ +/* timerisr.s + * + * If required this ISR is used to bump a count of interval "overflow" + * interrupts which have occurred since the timer was started. The + * number of overflows is taken into account in the Read_timer() + * routine if necessary. + * + * To reduce overhead this is best to be the "rawest" hardware interupt + * handler you can write. This should be the only interrupt which can + * occur during the measured time period. + * + * NOTE: This file is USUALLY in assembly and is LEAN AND MEAN. + * Any code in this isr is pure overhead which can perturb + * the accuracy of the Timing Test Suite. + * + * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. + * On-Line Applications Research Corporation (OAR). + * All rights assigned to U.S. Government, 1994. + * + * This material may be reproduced by or for the U.S. Government pursuant + * to the copyright license under the clause at DFARS 252.227-7013. This + * notice must appear in all copies of this file and its derivatives. + * + * timerisr.c,v 1.2 1995/05/31 16:56:40 joel Exp + */ + +#ifndef lint +static char _sccsid[] = "@(#)timerisr.c 03/15/96 1.1\n"; +#endif + +#include <rtems.h> + +extern rtems_unsigned32 _Timer_interrupts; + +void timerisr( void ) +{ + /* + * _Timer_interrupts += TIMER_BETWEEN_OVERFLOWS (usually in microseconds) + * return from interrupt + */ +} |