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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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34 | |||
35 | /* |
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36 | * This is the PIC driver. |
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37 | * Programmable Interrupt Controller for UP systems. |
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38 | */ |
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39 | |||
40 | void i8259_init(void) |
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41 | { |
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42 | /* ICW1: this is ICW1, ICW4 to follow */ |
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43 | outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4); |
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44 | |||
45 | /* ICW2: IRQ 0 maps to INT IRQBASE */ |
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46 | outb(PIC_PIC0PORT2, IVT_IRQBASE); |
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47 | |||
48 | /* ICW3: pic1 using IRQ IRQ_PIC1 */ |
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49 | outb(PIC_PIC0PORT2, 1 << IRQ_PIC1); |
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50 | |||
51 | /* ICW4: i8086 mode */ |
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52 | outb(PIC_PIC0PORT2, 1); |
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53 | |||
54 | /* ICW1: ICW1, ICW4 to follow */ |
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55 | outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4); |
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56 | |||
57 | /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */ |
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58 | outb(PIC_PIC1PORT2, IVT_IRQBASE + 8); |
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59 | |||
60 | /* ICW3: pic1 is known as PIC_PIC1ID */ |
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61 | outb(PIC_PIC1PORT2, PIC_PIC1ID); |
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62 | |||
63 | /* ICW4: i8086 mode */ |
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64 | outb(PIC_PIC1PORT2, 1); |
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65 | |||
66 | /* |
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67 | * Register interrupt handler for the PIC spurious interrupt. |
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68 | */ |
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69 | trap_register(VECTOR_PIC_SPUR, pic_spurious); |
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70 | |||
71 | /* |
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72 | * Set the enable/disable IRQs handlers. |
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73 | * Set the End-of-Interrupt handler. |
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74 | */ |
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75 | enable_irqs_function = pic_enable_irqs; |
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76 | disable_irqs_function = pic_disable_irqs; |
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77 | eoi_function = pic_eoi; |
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78 | |||
79 | pic_disable_irqs(0xffff); /* disable all irq's */ |
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80 | pic_enable_irqs(1<<IRQ_PIC1); /* but enable pic1 */ |
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81 | } |
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82 | |||
83 | void pic_enable_irqs(__u16 irqmask) |
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84 | { |
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85 | __u8 x; |
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86 | |||
87 | if (irqmask & 0xff) { |
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88 | x = inb(PIC_PIC0PORT2); |
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89 | outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff))); |
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90 | } |
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91 | if (irqmask >> 8) { |
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92 | x = inb(PIC_PIC1PORT2); |
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93 | outb(PIC_PIC1PORT2, x & (~(irqmask >> 8))); |
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94 | } |
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95 | } |
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96 | |||
97 | void pic_disable_irqs(__u16 irqmask) |
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98 | { |
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99 | __u8 x; |
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100 | |||
101 | if (irqmask & 0xff) { |
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102 | x = inb(PIC_PIC0PORT2); |
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103 | outb(PIC_PIC0PORT2, x | (irqmask & 0xff)); |
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104 | } |
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105 | if (irqmask >> 8) { |
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106 | x = inb(PIC_PIC1PORT2); |
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107 | outb(PIC_PIC1PORT2, x | (irqmask >> 8)); |
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108 | } |
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109 | } |
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110 | |||
111 | void pic_eoi(void) |
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112 | { |
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113 | outb(0x20,0x20); |
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114 | outb(0xa0,0x20); |
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115 | } |
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116 | |||
117 | void pic_spurious(__u8 n, __u32 stack[]) |
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118 | { |
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119 | printf("cpu%d: PIC spurious interrupt\n", the->cpu->id); |
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120 | } |