WebSVN – HelenOS – Diff – /tags/0.2.0.1/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.
 */
 
#include <interrupt.h>
#include <arch/interrupt.h>
#include <arch/types.h>
#include <arch.h>
#include <arch/cp0.h>
#include <time/clock.h>
#include <arch/drivers/arc.h>
 
#include <ipc/sysipc.h>
 
/** 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!!! */
static unsigned long nextcount;
/** Start hardware clock */
static void timer_start(void)
{
    nextcount = cp0_compare_value + cp0_count_read();
    cp0_compare_write(nextcount);
}
 
static void timer_exception(int n, istate_t *istate)
{
    unsigned long drift;
 
    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);
    clock();
}
 
static void swint0(int n, istate_t *istate)
{
    cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */
    ipc_irq_send_notif(0);
}
 
static void swint1(int n, istate_t *istate)
{
    cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */
    ipc_irq_send_notif(1);
}
 
/* Initialize basic tables for exception dispatching */
void interrupt_init(void)
{
    int_register(TIMER_IRQ, "timer", timer_exception);
    int_register(0, "swint0", swint0);
    int_register(1, "swint1", swint1);
    timer_start();
}
 
static void ipc_int(int n, istate_t *istate)
{
    ipc_irq_send_notif(n-INT_OFFSET);
}
 
/* Reregister irq to be IPC-ready */
void irq_ipc_bind_arch(__native irq)
{
    /* Do not allow to redefine timer */
    /* Swint0, Swint1 are already handled */
    if (irq == TIMER_IRQ || irq < 2)
        return;
    int_register(irq, "ipc_int", ipc_int);
}
 

Subversion Repositories HelenOS

(root)/tags/0.2.0.1/kernel/arch/mips32/src/interrupt.c – Rev 1965 → 1968

Rev 1965		Rev 1968
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	#include <interrupt.h>	29	#include <interrupt.h>
30	#include <arch/interrupt.h>	30	#include <arch/interrupt.h>
31	#include <arch/types.h>	31	#include <arch/types.h>
32	#include <arch.h>	32	#include <arch.h>
33	#include <arch/cp0.h>	33	#include <arch/cp0.h>
34	#include <time/clock.h>	34	#include <time/clock.h>
35	#include <arch/drivers/arc.h>	35	#include <arch/drivers/arc.h>
36		36
37	#include <ipc/sysipc.h>	37	#include <ipc/sysipc.h>
38		38
39	/** Disable interrupts.	39	/** Disable interrupts.
40	*	40	*
41	* @return Old interrupt priority level.	41	* @return Old interrupt priority level.
42	*/	42	*/
43	ipl_t interrupts_disable(void)	43	ipl_t interrupts_disable(void)
44	{	44	{
45	ipl_t ipl = (ipl_t) cp0_status_read();	45	ipl_t ipl = (ipl_t) cp0_status_read();
46	cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);	46	cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);
47	return ipl;	47	return ipl;
48	}	48	}
49		49
50	/** Enable interrupts.	50	/** Enable interrupts.
51	*	51	*
52	* @return Old interrupt priority level.	52	* @return Old interrupt priority level.
53	*/	53	*/
54	ipl_t interrupts_enable(void)	54	ipl_t interrupts_enable(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	/** Restore interrupt priority level.	61	/** Restore interrupt priority level.
62	*	62	*
63	* @param ipl Saved interrupt priority level.	63	* @param ipl Saved interrupt priority level.
64	*/	64	*/
65	void interrupts_restore(ipl_t ipl)	65	void interrupts_restore(ipl_t ipl)
66	{	66	{
67	cp0_status_write(cp0_status_read() \| (ipl & cp0_status_ie_enabled_bit));	67	cp0_status_write(cp0_status_read() \| (ipl & cp0_status_ie_enabled_bit));
68	}	68	}
69		69
70	/** Read interrupt priority level.	70	/** Read interrupt priority level.
71	*	71	*
72	* @return Current interrupt priority level.	72	* @return Current interrupt priority level.
73	*/	73	*/
74	ipl_t interrupts_read(void)	74	ipl_t interrupts_read(void)
75	{	75	{
76	return cp0_status_read();	76	return cp0_status_read();
77	}	77	}
78		78
79	/* TODO: This is SMP unsafe!!! */	79	/* TODO: This is SMP unsafe!!! */
80	static unsigned long nextcount;	80	static unsigned long nextcount;
81	/** Start hardware clock */	81	/** Start hardware clock */
82	static void timer_start(void)	82	static void timer_start(void)
83	{	83	{
84	nextcount = cp0_compare_value + cp0_count_read();	84	nextcount = cp0_compare_value + cp0_count_read();
85	cp0_compare_write(nextcount);	85	cp0_compare_write(nextcount);
86	}	86	}
87		87
88	static void timer_exception(int n, istate_t *istate)	88	static void timer_exception(int n, istate_t *istate)
89	{	89	{
90	unsigned long drift;	90	unsigned long drift;
91		91
92	drift = cp0_count_read() - nextcount;	92	drift = cp0_count_read() - nextcount;
93	while (drift > cp0_compare_value) {	93	while (drift > cp0_compare_value) {
94	drift -= cp0_compare_value;	94	drift -= cp0_compare_value;
95	CPU->missed_clock_ticks++;	95	CPU->missed_clock_ticks++;
96	}	96	}
97	nextcount = cp0_count_read() + cp0_compare_value - drift;	97	nextcount = cp0_count_read() + cp0_compare_value - drift;
98	cp0_compare_write(nextcount);	98	cp0_compare_write(nextcount);
99	clock();	99	clock();
100	}	100	}
101		101
102	static void swint0(int n, istate_t *istate)	102	static void swint0(int n, istate_t *istate)
103	{	103	{
104	cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */	104	cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */
105	ipc_irq_send_notif(0);	105	ipc_irq_send_notif(0);
106	}	106	}
107		107
108	static void swint1(int n, istate_t *istate)	108	static void swint1(int n, istate_t *istate)
109	{	109	{
110	cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */	110	cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */
111	ipc_irq_send_notif(1);	111	ipc_irq_send_notif(1);
112	}	112	}
113		113
114	/* Initialize basic tables for exception dispatching */	114	/* Initialize basic tables for exception dispatching */
115	void interrupt_init(void)	115	void interrupt_init(void)
116	{	116	{
117	int_register(TIMER_IRQ, "timer", timer_exception);	117	int_register(TIMER_IRQ, "timer", timer_exception);
118	int_register(0, "swint0", swint0);	118	int_register(0, "swint0", swint0);
119	int_register(1, "swint1", swint1);	119	int_register(1, "swint1", swint1);
120	timer_start();	120	timer_start();
121	}	121	}
122		122
123	static void ipc_int(int n, istate_t *istate)	123	static void ipc_int(int n, istate_t *istate)
124	{	124	{
125	ipc_irq_send_notif(n-INT_OFFSET);	125	ipc_irq_send_notif(n-INT_OFFSET);
126	}	126	}
127		127
128	/* Reregister irq to be IPC-ready */	128	/* Reregister irq to be IPC-ready */
129	void irq_ipc_bind_arch(__native irq)	129	void irq_ipc_bind_arch(__native irq)
130	{	130	{
131	/* Do not allow to redefine timer */	131	/* Do not allow to redefine timer */
132	/* Swint0, Swint1 are already handled */	132	/* Swint0, Swint1 are already handled */
133	if (irq == TIMER_IRQ \|\| irq < 2)	133	if (irq == TIMER_IRQ \|\| irq < 2)
134	return;	134	return;
135	int_register(irq, "ipc_int", ipc_int);	135	int_register(irq, "ipc_int", ipc_int);
136	}	136	}
137		137