WebSVN – HelenOS – Diff – /trunk/kernel/arch/ia64/src/drivers/it.c


/*
 * 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.
 */
 
 /** @addtogroup ia64  
 * @{
 */
/** @file
 */
 
/** 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)
{
    int64_t c;
    int64_t 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();
}
 
 /** @}
 */
 
 

Rev 1780	Rev 1787
1	/*	1	/*
2	* Copyright (C) 2005 Jakub Jermar	2	* Copyright (C) 2005 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup ia64	29	/** @addtogroup ia64
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	/** Interval Timer driver. */	35	/** Interval Timer driver. */
36		36
37	#include <arch/drivers/it.h>	37	#include <arch/drivers/it.h>
38	#include <arch/ski/ski.h>	38	#include <arch/ski/ski.h>
39	#include <arch/interrupt.h>	39	#include <arch/interrupt.h>
40	#include <arch/register.h>	40	#include <arch/register.h>
41	#include <arch/asm.h>	41	#include <arch/asm.h>
42	#include <arch/barrier.h>	42	#include <arch/barrier.h>
43	#include <time/clock.h>	43	#include <time/clock.h>
44	#include <arch.h>	44	#include <arch.h>
45		45
46		46
47	#define IT_SERVICE_CLOCKS 64	47	#define IT_SERVICE_CLOCKS 64
48		48
49	/** Initialize Interval Timer. */	49	/** Initialize Interval Timer. */
50	void it_init(void)	50	void it_init(void)
51	{	51	{
52	cr_itv_t itv;	52	cr_itv_t itv;
53		53
54	/* initialize Interval Timer external interrupt vector */	54	/* initialize Interval Timer external interrupt vector */
55	itv.value = itv_read();	55	itv.value = itv_read();
56	itv.vector = INTERRUPT_TIMER;	56	itv.vector = INTERRUPT_TIMER;
57	itv.m = 0;	57	itv.m = 0;
58	itv_write(itv.value);	58	itv_write(itv.value);
59		59
60	/* set Interval Timer Counter to zero */	60	/* set Interval Timer Counter to zero */
61	itc_write(0);	61	itc_write(0);
62		62
63	/* generate first Interval Timer interrupt in IT_DELTA ticks */	63	/* generate first Interval Timer interrupt in IT_DELTA ticks */
64	itm_write(IT_DELTA);	64	itm_write(IT_DELTA);
65		65
66	/* propagate changes */	66	/* propagate changes */
67	srlz_d();	67	srlz_d();
68	}	68	}
69		69
70		70
71	/** Process Interval Timer interrupt. */	71	/** Process Interval Timer interrupt. */
72	void it_interrupt(void)	72	void it_interrupt(void)
73	{	73	{
74	int64_t c;	74	int64_t c;
75	int64_t m;	75	int64_t m;
76		76
77	eoi_write(EOI);	77	eoi_write(EOI);
78		78
79	m=itm_read();	79	m=itm_read();
80		80
81	while(1)	81	while(1)
82	{	82	{
83		83
84	c=itc_read();	84	c=itc_read();
85	c+=IT_SERVICE_CLOCKS;	85	c+=IT_SERVICE_CLOCKS;
86		86
87	m+=IT_DELTA;	87	m+=IT_DELTA;
88	if(m-c<0)	88	if(m-c<0)
89	{	89	{
90	CPU->missed_clock_ticks++;	90	CPU->missed_clock_ticks++;
91	}	91	}
92	else break;	92	else break;
93	}	93	}
94		94
95	itm_write(m);	95	itm_write(m);
96	srlz_d(); /* propagate changes */	96	srlz_d(); /* propagate changes */
97		97
98		98
99		99
100	clock();	100	clock();
101	poll_keyboard();	101	poll_keyboard();
102	}	102	}
103		103
104	/** @}	104	/** @}
105	*/	105	*/
106		106
107		107

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia64/src/drivers/it.c @ 4313 – Rev 1780 → 1787