0,0 → 1,96 |
/* |
* Copyright (C) 2005 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** Interval Timer driver. */ |
|
#include <arch/drivers/it.h> |
#include <arch/ski/ski.h> |
#include <arch/interrupt.h> |
#include <arch/register.h> |
#include <arch/asm.h> |
#include <arch/barrier.h> |
#include <time/clock.h> |
#include <arch.h> |
|
|
#define IT_SERVICE_CLOCKS 64 |
|
/** Initialize Interval Timer. */ |
void it_init(void) |
{ |
cr_itv_t itv; |
|
/* initialize Interval Timer external interrupt vector */ |
itv.value = itv_read(); |
itv.vector = INTERRUPT_TIMER; |
itv.m = 0; |
itv_write(itv.value); |
|
/* set Interval Timer Counter to zero */ |
itc_write(0); |
|
/* generate first Interval Timer interrupt in IT_DELTA ticks */ |
itm_write(IT_DELTA); |
|
/* propagate changes */ |
srlz_d(); |
} |
|
|
/** Process Interval Timer interrupt. */ |
void it_interrupt(void) |
{ |
__s64 c; |
__s64 m; |
|
eoi_write(EOI); |
|
m=itm_read(); |
|
while(1) |
{ |
|
c=itc_read(); |
c+=IT_SERVICE_CLOCKS; |
|
m+=IT_DELTA; |
if(m-c<0) |
{ |
CPU->missed_clock_ticks++; |
} |
else break; |
} |
|
itm_write(m); |
srlz_d(); /* propagate changes */ |
|
|
|
clock(); |
poll_keyboard(); |
} |