diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/force386/timer/timer.c')
-rw-r--r-- | c/src/lib/libbsp/i386/force386/timer/timer.c | 96 |
1 files changed, 0 insertions, 96 deletions
diff --git a/c/src/lib/libbsp/i386/force386/timer/timer.c b/c/src/lib/libbsp/i386/force386/timer/timer.c deleted file mode 100644 index 1896e15a23..0000000000 --- a/c/src/lib/libbsp/i386/force386/timer/timer.c +++ /dev/null @@ -1,96 +0,0 @@ -/* Timer_init() - * - * This routine initializes the timer on the FORCE CPU-386 board. - * - * Input parameters: NONE - * - * Output parameters: NONE - * - * NOTE: This routine will not work if the optimizer is enabled - * for some compilers. The multiple writes to the Z8036 - * may be optimized away. - * - * It is important that the timer start/stop overhead be - * determined when porting or modifying this code. - * - * 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. - * - * $Id$ - */ - - -#include <rtems.h> -#include <bsp.h> - -int Ttimer_val; -rtems_boolean Timer_driver_Find_average_overhead; - -rtems_isr timerisr(); - -void Timer_initialize() -{ - - (void) set_vector( timerisr, 0x38, 0 ); /* install ISR */ - - Ttimer_val = 0; /* clear timer ISR count */ - - outport_byte( IERA, 0x40 ); /* disable interrupt */ - outport_byte( TBCR, 0x40 ); /* stop the timer */ - outport_byte( TBDR, 250 ); /* 250 units */ - - outport_byte( TBCR, 0x11 ); /* reset it, delay mode, 4X */ -#if 0 - outport_byte( TBCR, 0x13 ); /* reset it, delay mode, 16X */ -#endif - - outport_byte( IERA, 0x41 ); /* enable interrupt */ - -} - -#define AVG_OVERHEAD 3 /* It typically takes 3.0 microseconds */ - /* (3 ticks) to start/stop the timer. */ -#define LEAST_VALID 4 /* Don't trust a value lower than this */ - -int Read_timer() -{ - register rtems_unsigned32 clicks; - register rtems_unsigned32 total; - - outport_byte( TBCR, 0x00 ); /* stop the timer */ - - inport_byte( TBDR, clicks ); - - total = Ttimer_val + 250 - clicks; - - outport_byte( TBCR, 0x00 ); /* initial value */ - outport_byte( IERA, 0x40 ); /* disable interrupt */ - - /* ??? Is "do not restore old vector" causing problems? */ - - if ( Timer_driver_Find_average_overhead == 1 ) - return total; /* in one microsecond units */ - - else { - if ( total < LEAST_VALID ) - return 0; /* below timer resolution */ - return (total - AVG_OVERHEAD); - } -} - -rtems_status_code Empty_function( void ) -{ - return RTEMS_SUCCESSFUL; -} - -void Set_find_average_overhead( - rtems_boolean find_flag -) -{ - Timer_driver_Find_average_overhead = find_flag; -} |