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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #include <arch/i8259.h> |
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| 30 | #include <cpu.h> |
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| 31 | #include <arch/types.h> |
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| 32 | #include <arch/asm.h> |
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| 33 | #include <arch.h> |
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| 195 | vana | 34 | #include <print.h> |
| 576 | palkovsky | 35 | #include <interrupt.h> |
| 1 | jermar | 36 | |
| 37 | /* |
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| 38 | * This is the PIC driver. |
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| 39 | * Programmable Interrupt Controller for UP systems. |
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| 40 | */ |
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| 41 | |||
| 576 | palkovsky | 42 | static void pic_spurious(int n, void *stack); |
| 43 | |||
| 1 | jermar | 44 | void i8259_init(void) |
| 45 | { |
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| 46 | /* ICW1: this is ICW1, ICW4 to follow */ |
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| 47 | outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4); |
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| 48 | |||
| 49 | /* ICW2: IRQ 0 maps to INT IRQBASE */ |
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| 50 | outb(PIC_PIC0PORT2, IVT_IRQBASE); |
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| 125 | jermar | 51 | |
| 1 | jermar | 52 | /* ICW3: pic1 using IRQ IRQ_PIC1 */ |
| 53 | outb(PIC_PIC0PORT2, 1 << IRQ_PIC1); |
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| 125 | jermar | 54 | |
| 55 | /* ICW4: i8086 mode */ |
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| 1 | jermar | 56 | outb(PIC_PIC0PORT2, 1); |
| 57 | |||
| 58 | /* ICW1: ICW1, ICW4 to follow */ |
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| 59 | outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4); |
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| 60 | |||
| 125 | jermar | 61 | /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */ |
| 1 | jermar | 62 | outb(PIC_PIC1PORT2, IVT_IRQBASE + 8); |
| 63 | |||
| 305 | jermar | 64 | /* ICW3: pic1 is known as IRQ_PIC1 */ |
| 302 | palkovsky | 65 | outb(PIC_PIC1PORT2, IRQ_PIC1); |
| 1 | jermar | 66 | |
| 125 | jermar | 67 | /* ICW4: i8086 mode */ |
| 1 | jermar | 68 | outb(PIC_PIC1PORT2, 1); |
| 69 | |||
| 70 | /* |
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| 71 | * Register interrupt handler for the PIC spurious interrupt. |
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| 72 | */ |
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| 576 | palkovsky | 73 | exc_register(VECTOR_PIC_SPUR, "pic_spurious", pic_spurious); |
| 1 | jermar | 74 | |
| 75 | /* |
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| 76 | * Set the enable/disable IRQs handlers. |
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| 77 | * Set the End-of-Interrupt handler. |
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| 78 | */ |
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| 79 | enable_irqs_function = pic_enable_irqs; |
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| 80 | disable_irqs_function = pic_disable_irqs; |
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| 81 | eoi_function = pic_eoi; |
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| 125 | jermar | 82 | |
| 1 | jermar | 83 | pic_disable_irqs(0xffff); /* disable all irq's */ |
| 84 | pic_enable_irqs(1<<IRQ_PIC1); /* but enable pic1 */ |
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| 85 | } |
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| 86 | |||
| 87 | void pic_enable_irqs(__u16 irqmask) |
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| 88 | { |
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| 89 | __u8 x; |
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| 125 | jermar | 90 | |
| 1 | jermar | 91 | if (irqmask & 0xff) { |
| 125 | jermar | 92 | x = inb(PIC_PIC0PORT2); |
| 1 | jermar | 93 | outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff))); |
| 94 | } |
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| 95 | if (irqmask >> 8) { |
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| 125 | jermar | 96 | x = inb(PIC_PIC1PORT2); |
| 1 | jermar | 97 | outb(PIC_PIC1PORT2, x & (~(irqmask >> 8))); |
| 98 | } |
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| 99 | } |
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| 100 | |||
| 101 | void pic_disable_irqs(__u16 irqmask) |
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| 102 | { |
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| 103 | __u8 x; |
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| 125 | jermar | 104 | |
| 1 | jermar | 105 | if (irqmask & 0xff) { |
| 125 | jermar | 106 | x = inb(PIC_PIC0PORT2); |
| 1 | jermar | 107 | outb(PIC_PIC0PORT2, x | (irqmask & 0xff)); |
| 108 | } |
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| 109 | if (irqmask >> 8) { |
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| 125 | jermar | 110 | x = inb(PIC_PIC1PORT2); |
| 1 | jermar | 111 | outb(PIC_PIC1PORT2, x | (irqmask >> 8)); |
| 112 | } |
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| 113 | } |
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| 114 | |||
| 115 | void pic_eoi(void) |
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| 116 | { |
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| 117 | outb(0x20,0x20); |
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| 125 | jermar | 118 | outb(0xa0,0x20); |
| 1 | jermar | 119 | } |
| 120 | |||
| 576 | palkovsky | 121 | void pic_spurious(int n, void *stack) |
| 1 | jermar | 122 | { |
| 15 | jermar | 123 | printf("cpu%d: PIC spurious interrupt\n", CPU->id); |
| 1 | jermar | 124 | } |