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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 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 | */ |