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/interrupt.h>
#include <arch/register.h>
#include <arch/asm.h>
#include <arch/barrier.h>
#include <time/clock.h>
#include <ddi/irq.h>
#include <ddi/device.h>
#include <arch.h>
 
#define IT_SERVICE_CLOCKS 64
 
static irq_t it_irq;
 
static irq_ownership_t it_claim(void);
static void it_interrupt(irq_t *irq, void *arg, ...);
 
/** Initialize Interval Timer. */
void it_init(void)
{
    cr_itv_t itv;
 
    irq_initialize(&it_irq);
    it_irq.inr = INTERRUPT_TIMER;
    it_irq.devno = device_assign_devno();
    it_irq.claim = it_claim;
    it_irq.handler = it_interrupt;
    irq_register(&it_irq);
 
    /* 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();
}
 
/** Always claim ownership for this IRQ.
 *
 * Other devices are responsible to avoid using INR 0.
 *
 * @return Always IRQ_ACCEPT.
 */
irq_ownership_t it_claim(void)
{
    return IRQ_ACCEPT;
}
 
/** Process Interval Timer interrupt. */
void it_interrupt(irq_t *irq, void *arg, ...)
{
    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();
 
 
 
 
 
 
}
 
/** @}
 */
 

Rev 1942	Rev 1945
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>	-
39	#include <arch/interrupt.h>	38	#include <arch/interrupt.h>
40	#include <arch/register.h>	39	#include <arch/register.h>
41	#include <arch/asm.h>	40	#include <arch/asm.h>
42	#include <arch/barrier.h>	41	#include <arch/barrier.h>
43	#include <time/clock.h>	42	#include <time/clock.h>
44	#include <ddi/irq.h>	43	#include <ddi/irq.h>
45	#include <ddi/device.h>	44	#include <ddi/device.h>
46	#include <arch.h>	45	#include <arch.h>
47		46
48	#define IT_SERVICE_CLOCKS 64	47	#define IT_SERVICE_CLOCKS 64
49		48
50	static irq_t it_irq;	49	static irq_t it_irq;
51		50
52	static irq_ownership_t it_claim(void);	51	static irq_ownership_t it_claim(void);
53	static void it_interrupt(irq_t irq, void arg, ...);	52	static void it_interrupt(irq_t irq, void arg, ...);
54		53
55	/** Initialize Interval Timer. */	54	/** Initialize Interval Timer. */
56	void it_init(void)	55	void it_init(void)
57	{	56	{
58	cr_itv_t itv;	57	cr_itv_t itv;
59		58
60	irq_initialize(&it_irq);	59	irq_initialize(&it_irq);
61	it_irq.inr = INTERRUPT_TIMER;	60	it_irq.inr = INTERRUPT_TIMER;
62	it_irq.devno = device_assign_devno();	61	it_irq.devno = device_assign_devno();
63	it_irq.claim = it_claim;	62	it_irq.claim = it_claim;
64	it_irq.handler = it_interrupt;	63	it_irq.handler = it_interrupt;
65	irq_register(&it_irq);	64	irq_register(&it_irq);
66		65
67	/* initialize Interval Timer external interrupt vector */	66	/* initialize Interval Timer external interrupt vector */
68	itv.value = itv_read();	67	itv.value = itv_read();
69	itv.vector = INTERRUPT_TIMER;	68	itv.vector = INTERRUPT_TIMER;
70	itv.m = 0;	69	itv.m = 0;
71	itv_write(itv.value);	70	itv_write(itv.value);
72		71
73	/* set Interval Timer Counter to zero */	72	/* set Interval Timer Counter to zero */
74	itc_write(0);	73	itc_write(0);
75		74
76	/* generate first Interval Timer interrupt in IT_DELTA ticks */	75	/* generate first Interval Timer interrupt in IT_DELTA ticks */
77	itm_write(IT_DELTA);	76	itm_write(IT_DELTA);
78		77
79	/* propagate changes */	78	/* propagate changes */
80	srlz_d();	79	srlz_d();
81	}	80	}
82		81
83	/** Always claim ownership for this IRQ.	82	/** Always claim ownership for this IRQ.
84	*	83	*
85	* Other devices are responsible to avoid using INR 0.	84	* Other devices are responsible to avoid using INR 0.
86	*	85	*
87	* @return Always IRQ_ACCEPT.	86	* @return Always IRQ_ACCEPT.
88	*/	87	*/
89	irq_ownership_t it_claim(void)	88	irq_ownership_t it_claim(void)
90	{	89	{
91	return IRQ_ACCEPT;	90	return IRQ_ACCEPT;
92	}	91	}
93		92
94	/** Process Interval Timer interrupt. */	93	/** Process Interval Timer interrupt. */
95	void it_interrupt(irq_t irq, void arg, ...)	94	void it_interrupt(irq_t irq, void arg, ...)
96	{	95	{
97	int64_t c;	96	int64_t c;
98	int64_t m;	97	int64_t m;
99		98
100	eoi_write(EOI);	99	eoi_write(EOI);
101		100
102	m = itm_read();	101	m = itm_read();
103		102
104	while (1) {	103	while (1) {
105	c = itc_read();	104	c = itc_read();
106	c += IT_SERVICE_CLOCKS;	105	c += IT_SERVICE_CLOCKS;
107		106
108	m += IT_DELTA;	107	m += IT_DELTA;
109	if (m - c < 0)	108	if (m - c < 0)
110	CPU->missed_clock_ticks++;	109	CPU->missed_clock_ticks++;
111	else	110	else
112	break;	111	break;
113	}	112	}
114		113
115	itm_write(m);	114	itm_write(m);
116	srlz_d(); /* propagate changes */	115	srlz_d(); /* propagate changes */
117		116
118	clock();	117	clock();
119		-
120	/*	-
121	* This one is a good candidate for moving to a separate	-
122	* kernel thread private to ski.c	-
123	*/	-
124	poll_keyboard();	-
125	}	118	}
126		119
127	/** @}	120	/** @}
128	*/	121	*/
129		122

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia64/src/drivers/it.c @ 2081 – Rev 1942 → 1945