WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ia32/src/drivers/i8259.c


/*
 * Copyright (C) 2001-2004 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 <arch/i8259.h>
#include <cpu.h>
#include <arch/types.h>
#include <arch/asm.h>
#include <arch.h>
#include <print.h>
#include <interrupt.h>
 
/*
 * This is the PIC driver.
 * Programmable Interrupt Controller for UP systems.
 */
 
static void pic_spurious(int n, void *stack);
 
void i8259_init(void)
{
    /* ICW1: this is ICW1, ICW4 to follow */
    outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4);
 
    /* ICW2: IRQ 0 maps to INT IRQBASE */
    outb(PIC_PIC0PORT2, IVT_IRQBASE);
 
    /* ICW3: pic1 using IRQ IRQ_PIC1 */
    outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);
 
    /* ICW4: i8086 mode */
    outb(PIC_PIC0PORT2, 1);
 
    /* ICW1: ICW1, ICW4 to follow */
    outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
 
    /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
    outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
 
    /* ICW3: pic1 is known as IRQ_PIC1 */
    outb(PIC_PIC1PORT2, IRQ_PIC1);
 
    /* ICW4: i8086 mode */
    outb(PIC_PIC1PORT2, 1);
 
    /*
     * Register interrupt handler for the PIC spurious interrupt.
     */
    exc_register(VECTOR_PIC_SPUR, "pic_spurious", pic_spurious);   
 
    /*
     * Set the enable/disable IRQs handlers.
     * Set the End-of-Interrupt handler.
     */
    enable_irqs_function = pic_enable_irqs;
    disable_irqs_function = pic_disable_irqs;
    eoi_function = pic_eoi;
 
    pic_disable_irqs(0xffff);       /* disable all irq's */
    pic_enable_irqs(1<<IRQ_PIC1);       /* but enable pic1 */
}
 
void pic_enable_irqs(__u16 irqmask)
{
    __u8 x;
 
    if (irqmask & 0xff) {
        x = inb(PIC_PIC0PORT2);
        outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));
    }
    if (irqmask >> 8) {
        x = inb(PIC_PIC1PORT2);
        outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));
    }
}
 
void pic_disable_irqs(__u16 irqmask)
{
    __u8 x;
 
    if (irqmask & 0xff) {
        x = inb(PIC_PIC0PORT2);
        outb(PIC_PIC0PORT2, x | (irqmask & 0xff));
    }
    if (irqmask >> 8) {
        x = inb(PIC_PIC1PORT2);
        outb(PIC_PIC1PORT2, x | (irqmask >> 8));
    }
}
 
void pic_eoi(void)
{
    outb(0x20,0x20);
    outb(0xa0,0x20);
}
 
void pic_spurious(int n, void *stack)
{
    printf("cpu%d: PIC spurious interrupt\n", CPU->id);
}
 

Rev 534	Rev 576
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 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 <arch/i8259.h>	29	#include <arch/i8259.h>
30	#include <cpu.h>	30	#include <cpu.h>
31	#include <arch/types.h>	31	#include <arch/types.h>
32	#include <arch/asm.h>	32	#include <arch/asm.h>
33	#include <arch.h>	33	#include <arch.h>
34	#include <print.h>	34	#include <print.h>
-		35	#include <interrupt.h>
35		36
36	/*	37	/*
37	* This is the PIC driver.	38	* This is the PIC driver.
38	* Programmable Interrupt Controller for UP systems.	39	* Programmable Interrupt Controller for UP systems.
39	*/	40	*/
40		41
-		42	static void pic_spurious(int n, void *stack);
-		43
41	void i8259_init(void)	44	void i8259_init(void)
42	{	45	{
43	/* ICW1: this is ICW1, ICW4 to follow */	46	/* ICW1: this is ICW1, ICW4 to follow */
44	outb(PIC_PIC0PORT1, PIC_ICW1 \| PIC_NEEDICW4);	47	outb(PIC_PIC0PORT1, PIC_ICW1 \| PIC_NEEDICW4);
45		48
46	/* ICW2: IRQ 0 maps to INT IRQBASE */	49	/* ICW2: IRQ 0 maps to INT IRQBASE */
47	outb(PIC_PIC0PORT2, IVT_IRQBASE);	50	outb(PIC_PIC0PORT2, IVT_IRQBASE);
48		51
49	/* ICW3: pic1 using IRQ IRQ_PIC1 */	52	/* ICW3: pic1 using IRQ IRQ_PIC1 */
50	outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);	53	outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);
51		54
52	/* ICW4: i8086 mode */	55	/* ICW4: i8086 mode */
53	outb(PIC_PIC0PORT2, 1);	56	outb(PIC_PIC0PORT2, 1);
54		57
55	/* ICW1: ICW1, ICW4 to follow */	58	/* ICW1: ICW1, ICW4 to follow */
56	outb(PIC_PIC1PORT1, PIC_ICW1 \| PIC_NEEDICW4);	59	outb(PIC_PIC1PORT1, PIC_ICW1 \| PIC_NEEDICW4);
57		60
58	/* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */	61	/* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
59	outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);	62	outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
60		63
61	/* ICW3: pic1 is known as IRQ_PIC1 */	64	/* ICW3: pic1 is known as IRQ_PIC1 */
62	outb(PIC_PIC1PORT2, IRQ_PIC1);	65	outb(PIC_PIC1PORT2, IRQ_PIC1);
63		66
64	/* ICW4: i8086 mode */	67	/* ICW4: i8086 mode */
65	outb(PIC_PIC1PORT2, 1);	68	outb(PIC_PIC1PORT2, 1);
66		69
67	/*	70	/*
68	* Register interrupt handler for the PIC spurious interrupt.	71	* Register interrupt handler for the PIC spurious interrupt.
69	*/	72	*/
70	trap_register(VECTOR_PIC_SPUR, pic_spurious);	73	exc_register(VECTOR_PIC_SPUR, "pic_spurious", pic_spurious);
71		74
72	/*	75	/*
73	* Set the enable/disable IRQs handlers.	76	* Set the enable/disable IRQs handlers.
74	* Set the End-of-Interrupt handler.	77	* Set the End-of-Interrupt handler.
75	*/	78	*/
76	enable_irqs_function = pic_enable_irqs;	79	enable_irqs_function = pic_enable_irqs;
77	disable_irqs_function = pic_disable_irqs;	80	disable_irqs_function = pic_disable_irqs;
78	eoi_function = pic_eoi;	81	eoi_function = pic_eoi;
79		82
80	pic_disable_irqs(0xffff); /* disable all irq's */	83	pic_disable_irqs(0xffff); /* disable all irq's */
81	pic_enable_irqs(1<<IRQ_PIC1); /* but enable pic1 */	84	pic_enable_irqs(1<<IRQ_PIC1); /* but enable pic1 */
82	}	85	}
83		86
84	void pic_enable_irqs(__u16 irqmask)	87	void pic_enable_irqs(__u16 irqmask)
85	{	88	{
86	__u8 x;	89	__u8 x;
87		90
88	if (irqmask & 0xff) {	91	if (irqmask & 0xff) {
89	x = inb(PIC_PIC0PORT2);	92	x = inb(PIC_PIC0PORT2);
90	outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));	93	outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));
91	}	94	}
92	if (irqmask >> 8) {	95	if (irqmask >> 8) {
93	x = inb(PIC_PIC1PORT2);	96	x = inb(PIC_PIC1PORT2);
94	outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));	97	outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));
95	}	98	}
96	}	99	}
97		100
98	void pic_disable_irqs(__u16 irqmask)	101	void pic_disable_irqs(__u16 irqmask)
99	{	102	{
100	__u8 x;	103	__u8 x;
101		104
102	if (irqmask & 0xff) {	105	if (irqmask & 0xff) {
103	x = inb(PIC_PIC0PORT2);	106	x = inb(PIC_PIC0PORT2);
104	outb(PIC_PIC0PORT2, x \| (irqmask & 0xff));	107	outb(PIC_PIC0PORT2, x \| (irqmask & 0xff));
105	}	108	}
106	if (irqmask >> 8) {	109	if (irqmask >> 8) {
107	x = inb(PIC_PIC1PORT2);	110	x = inb(PIC_PIC1PORT2);
108	outb(PIC_PIC1PORT2, x \| (irqmask >> 8));	111	outb(PIC_PIC1PORT2, x \| (irqmask >> 8));
109	}	112	}
110	}	113	}
111		114
112	void pic_eoi(void)	115	void pic_eoi(void)
113	{	116	{
114	outb(0x20,0x20);	117	outb(0x20,0x20);
115	outb(0xa0,0x20);	118	outb(0xa0,0x20);
116	}	119	}
117		120
118	void pic_spurious(__u8 n, __native stack[])	121	void pic_spurious(int n, void *stack)
119	{	122	{
120	printf("cpu%d: PIC spurious interrupt\n", CPU->id);	123	printf("cpu%d: PIC spurious interrupt\n", CPU->id);
121	}	124	}
122		125

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/drivers/i8259.c – Rev 534 → 576