WebSVN – HelenOS – Diff – /branches/arm/kernel/arch/arm32/src/interrupt.c


/*
 * Copyright (c) 2007 Petr Stepan
 * 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 arm32
 * @{
 */
/** @file
 *  @brief Interrupts controlling routines.
 */
 
#include <arch/asm.h>
#include <arch/regutils.h>
#include <ddi/irq.h>
#include <arch/machine.h>
#include <interrupt.h>
 
/** Initial size of a table holding interrupt handlers. */
#define IRQ_COUNT 8
 
 
/** Disable interrupts.
 *
 * @return Old interrupt priority level.
 */
ipl_t interrupts_disable(void)
{
    ipl_t ipl = current_status_reg_read();
 
    current_status_reg_control_write(STATUS_REG_IRQ_DISABLED_BIT | ipl);
   
    return ipl;
}
 
 
/** Enable interrupts.
 *
 * @return Old interrupt priority level.
 */
ipl_t interrupts_enable(void)
{
    ipl_t ipl = current_status_reg_read();
 
    current_status_reg_control_write(ipl & ~STATUS_REG_IRQ_DISABLED_BIT);
 
    return ipl;
}
 
 
/** Restore interrupt priority level.
 *
 * @param ipl Saved interrupt priority level.
 */
void interrupts_restore(ipl_t ipl)
{
    current_status_reg_control_write(
        (current_status_reg_read() & ~STATUS_REG_IRQ_DISABLED_BIT) |
        (ipl & STATUS_REG_IRQ_DISABLED_BIT));
 
}
 
 
/** Read interrupt priority level.
 *
 * @return Current interrupt priority level.
 */
ipl_t interrupts_read(void)
{
    return current_status_reg_read();
}
 
 
/** Initialize basic tables for exception dispatching
 * and starts the timer.
 */
void interrupt_init(void)
{
    irq_init(IRQ_COUNT, IRQ_COUNT);
    machine_timer_irq_start();
}
 
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/branches/arm/kernel/arch/arm32/src/interrupt.c – Rev 2411 → 2464

Rev 2411		Rev 2464
1	/*	1	/*
2	* Copyright (c) 2007 Petr Stepan	2	* Copyright (c) 2007 Petr Stepan
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 arm32	29	/** @addtogroup arm32
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	* @brief Interrupts controlling routines.	33	* @brief Interrupts controlling routines.
34	*/	34	*/
35		35
36	#include <arch/asm.h>	36	#include <arch/asm.h>
37	#include <arch/regutils.h>	37	#include <arch/regutils.h>
38	#include <ddi/irq.h>	38	#include <ddi/irq.h>
39	#include <arch/machine.h>	39	#include <arch/machine.h>
40	#include <interrupt.h>	40	#include <interrupt.h>
41		41
42	/** Initial size of a table holding interrupt handlers. */	42	/** Initial size of a table holding interrupt handlers. */
43	#define IRQ_COUNT 8	43	#define IRQ_COUNT 8
44		44
45		-
46	/** Disable interrupts.	45	/** Disable interrupts.
47	*	46	*
48	* @return Old interrupt priority level.	47	* @return Old interrupt priority level.
49	*/	48	*/
50	ipl_t interrupts_disable(void)	49	ipl_t interrupts_disable(void)
51	{	50	{
52	ipl_t ipl = current_status_reg_read();	51	ipl_t ipl = current_status_reg_read();
53		52
54	current_status_reg_control_write(STATUS_REG_IRQ_DISABLED_BIT \| ipl);	53	current_status_reg_control_write(STATUS_REG_IRQ_DISABLED_BIT \| ipl);
55		54
56	return ipl;	55	return ipl;
57	}	56	}
58		57
59		-
60	/** Enable interrupts.	58	/** Enable interrupts.
61	*	59	*
62	* @return Old interrupt priority level.	60	* @return Old interrupt priority level.
63	*/	61	*/
64	ipl_t interrupts_enable(void)	62	ipl_t interrupts_enable(void)
65	{	63	{
66	ipl_t ipl = current_status_reg_read();	64	ipl_t ipl = current_status_reg_read();
67		65
68	current_status_reg_control_write(ipl & ~STATUS_REG_IRQ_DISABLED_BIT);	66	current_status_reg_control_write(ipl & ~STATUS_REG_IRQ_DISABLED_BIT);
69		67
70	return ipl;	68	return ipl;
71	}	69	}
72		70
73		-
74	/** Restore interrupt priority level.	71	/** Restore interrupt priority level.
75	*	72	*
76	* @param ipl Saved interrupt priority level.	73	* @param ipl Saved interrupt priority level.
77	*/	74	*/
78	void interrupts_restore(ipl_t ipl)	75	void interrupts_restore(ipl_t ipl)
79	{	76	{
80	current_status_reg_control_write(	77	current_status_reg_control_write(
81	(current_status_reg_read() & ~STATUS_REG_IRQ_DISABLED_BIT) \|	78	(current_status_reg_read() & ~STATUS_REG_IRQ_DISABLED_BIT) \|
82	(ipl & STATUS_REG_IRQ_DISABLED_BIT)	79	(ipl & STATUS_REG_IRQ_DISABLED_BIT));
83	);	-
84	}	80	}
85		81
86		-
87	/** Read interrupt priority level.	82	/** Read interrupt priority level.
88	*	83	*
89	* @return Current interrupt priority level.	84	* @return Current interrupt priority level.
90	*/	85	*/
91	ipl_t interrupts_read(void)	86	ipl_t interrupts_read(void)
92	{	87	{
93	return current_status_reg_read();	88	return current_status_reg_read();
94	}	89	}
95		90
96		-
97	/** Initialize basic tables for exception dispatching	91	/** Initialize basic tables for exception dispatching
98	* and starts the timer.	92	* and starts the timer.
99	*/	93	*/
100	void interrupt_init(void)	94	void interrupt_init(void)
101	{	95	{
102	irq_init(IRQ_COUNT, IRQ_COUNT);	96	irq_init(IRQ_COUNT, IRQ_COUNT);
103	machine_timer_irq_start();	97	machine_timer_irq_start();
104	}	98	}
105		99
106		-
107	/** @}	100	/** @}
108	*/	101	*/
109		102