WebSVN – HelenOS – Diff – /branches/arm/kernel/arch/mips32/src/interrupt.c


/*
 * Copyright (c) 2003-2004 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 mips32interrupt
 * @{
 */
/** @file
 */
 
#include <interrupt.h>
#include <arch/interrupt.h>
#include <arch/types.h>
#include <arch.h>
#include <arch/cp0.h>
#include <time/clock.h>
#include <ipc/sysipc.h>
#include <ddi/device.h>
 
#define IRQ_COUNT 8
#define TIMER_IRQ 7
 
function virtual_timer_fnc = NULL;
static irq_t timer_irq;
 
/** Disable interrupts.
 *
 * @return Old interrupt priority level.
 */
ipl_t interrupts_disable(void)
{
    ipl_t ipl = (ipl_t) cp0_status_read();
    cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);
    return ipl;
}
 
/** Enable interrupts.
 *
 * @return Old interrupt priority level.
 */
ipl_t interrupts_enable(void)
{
    ipl_t ipl = (ipl_t) cp0_status_read();
    cp0_status_write(ipl | cp0_status_ie_enabled_bit);
    return ipl;
}
 
/** Restore interrupt priority level.
 *
 * @param ipl Saved interrupt priority level.
 */
void interrupts_restore(ipl_t ipl)
{
    cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit));
}
 
/** Read interrupt priority level.
 *
 * @return Current interrupt priority level.
 */
ipl_t interrupts_read(void)
{
    return cp0_status_read();
}
 
/* TODO: This is SMP unsafe!!! */
uint32_t count_hi = 0;
static unsigned long nextcount;
static unsigned long lastcount;
 
/** Start hardware clock */
static void timer_start(void)
{
    lastcount = cp0_count_read();
    nextcount = cp0_compare_value + cp0_count_read();
    cp0_compare_write(nextcount);
}
 
static irq_ownership_t timer_claim(void)
{
    return IRQ_ACCEPT;
}
 
static void timer_irq_handler(irq_t *irq, void *arg, ...)
{
    unsigned long drift;
   
    if (cp0_count_read() < lastcount)
        /* Count overflow detected */
        count_hi++;
    lastcount = cp0_count_read();
   
    drift = cp0_count_read() - nextcount;
    while (drift > cp0_compare_value) {
        drift -= cp0_compare_value;
        CPU->missed_clock_ticks++;
    }
    nextcount = cp0_count_read() + cp0_compare_value - drift;
    cp0_compare_write(nextcount);
   
    /*
     * We are holding a lock which prevents preemption.
     * Release the lock, call clock() and reacquire the lock again.
     */
    spinlock_unlock(&irq->lock);
    clock();
    spinlock_lock(&irq->lock);
   
    if (virtual_timer_fnc != NULL)
        virtual_timer_fnc();
}
 
/* Initialize basic tables for exception dispatching */
void interrupt_init(void)
{
    irq_init(IRQ_COUNT, IRQ_COUNT);
   
    irq_initialize(&timer_irq);
    timer_irq.devno = device_assign_devno();
    timer_irq.inr = TIMER_IRQ;
    timer_irq.claim = timer_claim;
    timer_irq.handler = timer_irq_handler;
    irq_register(&timer_irq);
   
    timer_start();
    cp0_unmask_int(TIMER_IRQ);
}
 
/** @}
 */
 

Rev 3228	Rev 3478
1	/*	1	/*
2	* Copyright (c) 2003-2004 Jakub Jermar	2	* Copyright (c) 2003-2004 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 mips32interrupt	29	/** @addtogroup mips32interrupt
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <interrupt.h>	35	#include <interrupt.h>
36	#include <arch/interrupt.h>	36	#include <arch/interrupt.h>
37	#include <arch/types.h>	37	#include <arch/types.h>
38	#include <arch.h>	38	#include <arch.h>
39	#include <arch/cp0.h>	39	#include <arch/cp0.h>
40	#include <time/clock.h>	40	#include <time/clock.h>
41	#include <ipc/sysipc.h>	41	#include <ipc/sysipc.h>
42	#include <ddi/device.h>	42	#include <ddi/device.h>
43		43
44	#define IRQ_COUNT 8	44	#define IRQ_COUNT 8
45	#define TIMER_IRQ 7	45	#define TIMER_IRQ 7
46		46
47	function virtual_timer_fnc = NULL;	47	function virtual_timer_fnc = NULL;
48	static irq_t timer_irq;	48	static irq_t timer_irq;
49		49
50	/** Disable interrupts.	50	/** Disable interrupts.
51	*	51	*
52	* @return Old interrupt priority level.	52	* @return Old interrupt priority level.
53	*/	53	*/
54	ipl_t interrupts_disable(void)	54	ipl_t interrupts_disable(void)
55	{	55	{
56	ipl_t ipl = (ipl_t) cp0_status_read();	56	ipl_t ipl = (ipl_t) cp0_status_read();
57	cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);	57	cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);
58	return ipl;	58	return ipl;
59	}	59	}
60		60
61	/** Enable interrupts.	61	/** Enable interrupts.
62	*	62	*
63	* @return Old interrupt priority level.	63	* @return Old interrupt priority level.
64	*/	64	*/
65	ipl_t interrupts_enable(void)	65	ipl_t interrupts_enable(void)
66	{	66	{
67	ipl_t ipl = (ipl_t) cp0_status_read();	67	ipl_t ipl = (ipl_t) cp0_status_read();
68	cp0_status_write(ipl \| cp0_status_ie_enabled_bit);	68	cp0_status_write(ipl \| cp0_status_ie_enabled_bit);
69	return ipl;	69	return ipl;
70	}	70	}
71		71
72	/** Restore interrupt priority level.	72	/** Restore interrupt priority level.
73	*	73	*
74	* @param ipl Saved interrupt priority level.	74	* @param ipl Saved interrupt priority level.
75	*/	75	*/
76	void interrupts_restore(ipl_t ipl)	76	void interrupts_restore(ipl_t ipl)
77	{	77	{
78	cp0_status_write(cp0_status_read() \| (ipl & cp0_status_ie_enabled_bit));	78	cp0_status_write(cp0_status_read() \| (ipl & cp0_status_ie_enabled_bit));
79	}	79	}
80		80
81	/** Read interrupt priority level.	81	/** Read interrupt priority level.
82	*	82	*
83	* @return Current interrupt priority level.	83	* @return Current interrupt priority level.
84	*/	84	*/
85	ipl_t interrupts_read(void)	85	ipl_t interrupts_read(void)
86	{	86	{
87	return cp0_status_read();	87	return cp0_status_read();
88	}	88	}
89		89
90	/* TODO: This is SMP unsafe!!! */	90	/* TODO: This is SMP unsafe!!! */
91	uint32_t count_hi = 0;	91	uint32_t count_hi = 0;
92	static unsigned long nextcount;	92	static unsigned long nextcount;
93	static unsigned long lastcount;	93	static unsigned long lastcount;
94		94
95	/** Start hardware clock */	95	/** Start hardware clock */
96	static void timer_start(void)	96	static void timer_start(void)
97	{	97	{
98	lastcount = cp0_count_read();	98	lastcount = cp0_count_read();
99	nextcount = cp0_compare_value + cp0_count_read();	99	nextcount = cp0_compare_value + cp0_count_read();
100	cp0_compare_write(nextcount);	100	cp0_compare_write(nextcount);
101	}	101	}
102		102
103	static irq_ownership_t timer_claim(void)	103	static irq_ownership_t timer_claim(void)
104	{	104	{
105	return IRQ_ACCEPT;	105	return IRQ_ACCEPT;
106	}	106	}
107		107
108	static void timer_irq_handler(irq_t irq, void arg, ...)	108	static void timer_irq_handler(irq_t irq, void arg, ...)
109	{	109	{
110	unsigned long drift;	110	unsigned long drift;
111		111
112	if (cp0_count_read() < lastcount)	112	if (cp0_count_read() < lastcount)
113	/* Count overflow detected */	113	/* Count overflow detected */
114	count_hi++;	114	count_hi++;
115	lastcount = cp0_count_read();	115	lastcount = cp0_count_read();
116		116
117	drift = cp0_count_read() - nextcount;	117	drift = cp0_count_read() - nextcount;
118	while (drift > cp0_compare_value) {	118	while (drift > cp0_compare_value) {
119	drift -= cp0_compare_value;	119	drift -= cp0_compare_value;
120	CPU->missed_clock_ticks++;	120	CPU->missed_clock_ticks++;
121	}	121	}
122	nextcount = cp0_count_read() + cp0_compare_value - drift;	122	nextcount = cp0_count_read() + cp0_compare_value - drift;
123	cp0_compare_write(nextcount);	123	cp0_compare_write(nextcount);
124		124
125	/*	125	/*
126	* We are holding a lock which prevents preemption.	126	* We are holding a lock which prevents preemption.
127	* Release the lock, call clock() and reacquire the lock again.	127	* Release the lock, call clock() and reacquire the lock again.
128	*/	128	*/
129	spinlock_unlock(&irq->lock);	129	spinlock_unlock(&irq->lock);
130	clock();	130	clock();
131	spinlock_lock(&irq->lock);	131	spinlock_lock(&irq->lock);
132		132
133	if (virtual_timer_fnc != NULL)	133	if (virtual_timer_fnc != NULL)
134	virtual_timer_fnc();	134	virtual_timer_fnc();
135	}	135	}
136		136
137	/* Initialize basic tables for exception dispatching */	137	/* Initialize basic tables for exception dispatching */
138	void interrupt_init(void)	138	void interrupt_init(void)
139	{	139	{
140	irq_init(IRQ_COUNT, IRQ_COUNT);	140	irq_init(IRQ_COUNT, IRQ_COUNT);
141		141
142	irq_initialize(&timer_irq);	142	irq_initialize(&timer_irq);
143	timer_irq.devno = device_assign_devno();	143	timer_irq.devno = device_assign_devno();
144	timer_irq.inr = TIMER_IRQ;	144	timer_irq.inr = TIMER_IRQ;
145	timer_irq.claim = timer_claim;	145	timer_irq.claim = timer_claim;
146	timer_irq.handler = timer_irq_handler;	146	timer_irq.handler = timer_irq_handler;
147	irq_register(&timer_irq);	147	irq_register(&timer_irq);
148		148
149	timer_start();	149	timer_start();
150	cp0_unmask_int(TIMER_IRQ);	150	cp0_unmask_int(TIMER_IRQ);
151	}	151	}
152		152
153	/** @}	153	/** @}
154	*/	154	*/
155		155

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(root)/branches/arm/kernel/arch/mips32/src/interrupt.c – Rev 3228 → 3478