Rev 15 | Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 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 |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 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 |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 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 |
||
| 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 |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | #include <arch/i8259.h> |
||
| 30 | #include <cpu.h> |
||
| 31 | #include <arch/types.h> |
||
| 32 | #include <arch/asm.h> |
||
| 33 | #include <arch.h> |
||
| 34 | |||
| 35 | /* |
||
| 36 | * This is the PIC driver. |
||
| 37 | * Programmable Interrupt Controller for UP systems. |
||
| 38 | */ |
||
| 39 | |||
| 40 | void i8259_init(void) |
||
| 41 | { |
||
| 42 | /* ICW1: this is ICW1, ICW4 to follow */ |
||
| 43 | outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4); |
||
| 44 | |||
| 45 | /* ICW2: IRQ 0 maps to INT IRQBASE */ |
||
| 46 | outb(PIC_PIC0PORT2, IVT_IRQBASE); |
||
| 47 | |||
| 48 | /* ICW3: pic1 using IRQ IRQ_PIC1 */ |
||
| 49 | outb(PIC_PIC0PORT2, 1 << IRQ_PIC1); |
||
| 50 | |||
| 51 | /* ICW4: i8086 mode */ |
||
| 52 | outb(PIC_PIC0PORT2, 1); |
||
| 53 | |||
| 54 | /* ICW1: ICW1, ICW4 to follow */ |
||
| 55 | outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4); |
||
| 56 | |||
| 57 | /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */ |
||
| 58 | outb(PIC_PIC1PORT2, IVT_IRQBASE + 8); |
||
| 59 | |||
| 60 | /* ICW3: pic1 is known as PIC_PIC1ID */ |
||
| 61 | outb(PIC_PIC1PORT2, PIC_PIC1ID); |
||
| 62 | |||
| 63 | /* ICW4: i8086 mode */ |
||
| 64 | outb(PIC_PIC1PORT2, 1); |
||
| 65 | |||
| 66 | /* |
||
| 67 | * Register interrupt handler for the PIC spurious interrupt. |
||
| 68 | */ |
||
| 69 | trap_register(VECTOR_PIC_SPUR, pic_spurious); |
||
| 70 | |||
| 71 | /* |
||
| 72 | * Set the enable/disable IRQs handlers. |
||
| 73 | * Set the End-of-Interrupt handler. |
||
| 74 | */ |
||
| 75 | enable_irqs_function = pic_enable_irqs; |
||
| 76 | disable_irqs_function = pic_disable_irqs; |
||
| 77 | eoi_function = pic_eoi; |
||
| 78 | |||
| 79 | pic_disable_irqs(0xffff); /* disable all irq's */ |
||
| 80 | pic_enable_irqs(1<<IRQ_PIC1); /* but enable pic1 */ |
||
| 81 | } |
||
| 82 | |||
| 83 | void pic_enable_irqs(__u16 irqmask) |
||
| 84 | { |
||
| 85 | __u8 x; |
||
| 86 | |||
| 87 | if (irqmask & 0xff) { |
||
| 88 | x = inb(PIC_PIC0PORT2); |
||
| 89 | outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff))); |
||
| 90 | } |
||
| 91 | if (irqmask >> 8) { |
||
| 92 | x = inb(PIC_PIC1PORT2); |
||
| 93 | outb(PIC_PIC1PORT2, x & (~(irqmask >> 8))); |
||
| 94 | } |
||
| 95 | } |
||
| 96 | |||
| 97 | void pic_disable_irqs(__u16 irqmask) |
||
| 98 | { |
||
| 99 | __u8 x; |
||
| 100 | |||
| 101 | if (irqmask & 0xff) { |
||
| 102 | x = inb(PIC_PIC0PORT2); |
||
| 103 | outb(PIC_PIC0PORT2, x | (irqmask & 0xff)); |
||
| 104 | } |
||
| 105 | if (irqmask >> 8) { |
||
| 106 | x = inb(PIC_PIC1PORT2); |
||
| 107 | outb(PIC_PIC1PORT2, x | (irqmask >> 8)); |
||
| 108 | } |
||
| 109 | } |
||
| 110 | |||
| 111 | void pic_eoi(void) |
||
| 112 | { |
||
| 113 | outb(0x20,0x20); |
||
| 114 | outb(0xa0,0x20); |
||
| 115 | } |
||
| 116 | |||
| 117 | void pic_spurious(__u8 n, __u32 stack[]) |
||
| 118 | { |
||
| 119 | printf("cpu%d: PIC spurious interrupt\n", the->cpu->id); |
||
| 120 | } |