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/* Clock_initialize
*
* This routine initializes the Timer/Counter on the Intel
* 386ex evaluation board.
*
* The tick frequency is 1 millisecond.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* 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 <bsp.h>
#include <clockdrv.h>
#include <stdlib.h>
volatile rtems_unsigned32 Clock_driver_ticks;
rtems_unsigned32 Clock_isrs; /* ISRs until next tick */
rtems_isr_entry Old_ticker;
rtems_device_driver Clock_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp,
rtems_id tid,
rtems_unsigned32 *rval
)
{
Install_clock( Clock_isr );
}
void ReInstall_clock(
rtems_isr_entry clock_isr
)
{
rtems_unsigned32 isrlevel = 0;
rtems_interrupt_disable( isrlevel );
(void) set_vector( clock_isr, 0x20, 1 ); /* was 0x38 */
rtems_interrupt_enable( isrlevel );
}
void Install_clock(
rtems_isr_entry clock_isr
)
{
Clock_driver_ticks = 0;
Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
if ( BSP_Configuration.ticks_per_timeslice ) {
Old_ticker = ( rtems_isr_entry ) set_vector( clock_isr, 0x20, 1 );
/* was 0x38 */
/* The following is already set up in interns.s ->
( This is test code only... production code will move the
TMRCFG stuff here )
*/
#define TMR0 0xF040
#define TMR1 0xF041
#define TMR2 0xF042
#define TMRCON 0xF043
#define TMRCFG 0xF834
outport_byte ( TMRCFG , 0x80 );
outport_byte ( TMRCON , 0x34 );
outport_byte ( TMR0 , 0xA8 );
outport_byte ( TMR0 , 0x04 );
outport_byte ( TMRCFG , 0x00 );
}
atexit( Clock_exit );
}
void Clock_exit( void )
{
if ( BSP_Configuration.ticks_per_timeslice ) {
/* outport_byte( TBCR, 0x00 ); */ /* initial value */
/* outport_byte( IERA, 0x40 ); */ /* disable interrupt */
/* ??? Is "do not restore old vector" causing problems? */
}
}
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