| 1 | /*
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| 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 |
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| 29 | /** @addtogroup ppc32interrupt
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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 |
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| 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 |
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| 46 |
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| 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 |
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| 56 |
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| 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 |
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| 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 |
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| 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 |
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| 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%u: spurious interrupt (inum=%d)\n", CPU->id, inum);
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| 84 | #endif
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| 85 | }
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| 86 |
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| 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 |
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| 92 |
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| 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 |
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| 99 |
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| 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_DATA_STORAGE, "data_storage", pht_refill);
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| 104 | exc_register(VECTOR_INSTRUCTION_STORAGE, "instruction_storage", pht_refill);
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| 105 | exc_register(VECTOR_EXTERNAL, "external", exception_external);
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| 106 | exc_register(VECTOR_DECREMENTER, "timer", exception_decrementer);
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| 107 | }
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| 108 |
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| 109 | /** @}
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| 110 | */
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