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1004 decky 1 
/*
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 * Copyright (c) 2006 Martin Decky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ppc32interrupt
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 * @{
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 */
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/** @file
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 */
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#include <ddi/irq.h>
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#include <interrupt.h>
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#include <arch/interrupt.h>
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#include <arch/types.h>
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#include <arch.h>
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#include <time/clock.h>
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#include <ipc/sysipc.h>
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#include <arch/drivers/pic.h>
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#include <arch/mm/tlb.h>
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#include <print.h>
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void start_decrementer(void)
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{
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	asm volatile (
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		"mtdec %0\n"
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		:
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		: "r" (1000)
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	);
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}
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/** Handler of external interrupts */
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static void exception_external(int n, istate_t *istate)
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{
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	int inum;
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	while ((inum = pic_get_pending()) != -1) {
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		bool ack = false;
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		irq_t *irq = irq_dispatch_and_lock(inum);
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		if (irq) {
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			/*
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			 * The IRQ handler was found.
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			 */
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			if (irq->preack) {
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				/* Acknowledge the interrupt before processing */
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				pic_ack_interrupt(inum);
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				ack = true;
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			}
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			irq->handler(irq, irq->arg);
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			spinlock_unlock(&irq->lock);
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		} else {
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			/*
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			 * Spurious interrupt.
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			 */
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#ifdef CONFIG_DEBUG
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			printf("cpu%u: spurious interrupt (inum=%d)\n", CPU->id, inum);
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#endif
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		}
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		if (!ack)
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			pic_ack_interrupt(inum);
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	}
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}
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static void exception_decrementer(int n, istate_t *istate)
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{
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	start_decrementer();
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	clock();
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}
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/* Initialize basic tables for exception dispatching */
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void interrupt_init(void)
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{
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	exc_register(VECTOR_DATA_STORAGE, "data_storage", pht_refill);
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	exc_register(VECTOR_INSTRUCTION_STORAGE, "instruction_storage", pht_refill);
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	exc_register(VECTOR_EXTERNAL, "external", exception_external);
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	exc_register(VECTOR_DECREMENTER, "timer", exception_decrementer);
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}
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/** @}
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 */