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2265 | hudecek | 1 | /* |
2 | * Copyright (c) 2006 Martin Decky |
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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 | /** @addtogroup ppc64interrupt |
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30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
35 | #include <ddi/irq.h> |
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36 | #include <interrupt.h> |
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37 | #include <arch/interrupt.h> |
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38 | #include <arch/types.h> |
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39 | #include <arch.h> |
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40 | #include <time/clock.h> |
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41 | #include <ipc/sysipc.h> |
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42 | #include <arch/drivers/pic.h> |
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43 | #include <arch/mm/tlb.h> |
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44 | #include <print.h> |
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45 | |||
46 | |||
47 | void start_decrementer(void) |
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48 | { |
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49 | asm volatile ( |
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50 | "mtdec %0\n" |
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51 | : |
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52 | : "r" (1000) |
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53 | ); |
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54 | } |
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55 | |||
56 | |||
57 | /** Handler of external interrupts */ |
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58 | static void exception_external(int n, istate_t *istate) |
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59 | { |
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60 | int inum; |
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61 | |||
62 | while ((inum = pic_get_pending()) != -1) { |
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63 | bool ack = false; |
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64 | irq_t *irq = irq_dispatch_and_lock(inum); |
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65 | if (irq) { |
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66 | /* |
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67 | * The IRQ handler was found. |
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68 | */ |
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69 | |||
70 | if (irq->preack) { |
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71 | /* Acknowledge the interrupt before processing */ |
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72 | pic_ack_interrupt(inum); |
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73 | ack = true; |
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74 | } |
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75 | |||
76 | irq->handler(irq, irq->arg); |
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77 | spinlock_unlock(&irq->lock); |
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78 | } else { |
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79 | /* |
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80 | * Spurious interrupt. |
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81 | */ |
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82 | #ifdef CONFIG_DEBUG |
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83 | printf("cpu%d: spurious interrupt (inum=%d)\n", CPU->id, inum); |
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84 | #endif |
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85 | } |
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86 | |||
87 | if (!ack) |
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88 | pic_ack_interrupt(inum); |
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89 | } |
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90 | } |
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91 | |||
92 | |||
93 | static void exception_decrementer(int n, istate_t *istate) |
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94 | { |
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95 | clock(); |
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96 | start_decrementer(); |
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97 | } |
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98 | |||
99 | |||
100 | /* Initialize basic tables for exception dispatching */ |
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101 | void interrupt_init(void) |
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102 | { |
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103 | exc_register(VECTOR_EXTERNAL, "external", exception_external); |
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104 | exc_register(VECTOR_DECREMENTER, "timer", exception_decrementer); |
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105 | } |
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106 | |||
107 | /** @} |
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108 | */ |