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1 jermar 1 
/*
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 * Copyright (C) 2003-2004 Jakub Jermar
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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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#include <arch/interrupt.h>
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#include <arch/types.h>
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#include <arch.h>
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#include <arch/cp0.h>
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#include <time/clock.h>
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#include <panic.h>
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#include <print.h>
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#include <symtab.h>
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#include <arch/drivers/arc.h>
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#include <arch/drivers/keyboard.h>
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static void print_regdump(struct exception_regdump *pstate)
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{
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    char *pcsymbol = "";
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    char *rasymbol = "";
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    char *s = get_symtab_entry(pstate->epc);
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    if (s)
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        pcsymbol = s;
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    s = get_symtab_entry(pstate->ra);
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    if (s)
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        rasymbol = s;
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    printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol,
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           pstate->ra,rasymbol);
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}
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/** Disable interrupts.
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 *
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 * @return Old interrupt priority level.
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 */
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ipl_t interrupts_disable(void)
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{
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    ipl_t ipl = (ipl_t) cp0_status_read();
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    cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);
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    return ipl;
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}
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/** Enable interrupts.
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 *
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 * @return Old interrupt priority level.
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 */
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ipl_t interrupts_enable(void)
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{
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    ipl_t ipl = (ipl_t) cp0_status_read();
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    cp0_status_write(ipl | cp0_status_ie_enabled_bit);
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    return ipl;
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}
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/** Restore interrupt priority level.
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 *
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 * @param ipl Saved interrupt priority level.
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 */
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void interrupts_restore(ipl_t ipl)
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{
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    cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit));
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}
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/** Read interrupt priority level.
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 *
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 * @return Current interrupt priority level.
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 */
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ipl_t interrupts_read(void)
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{
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    return cp0_status_read();
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}
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void interrupt(struct exception_regdump *pstate)
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{
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    __u32 cause;
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    int i;
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    /* decode interrupt number and process the interrupt */
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    cause = (cp0_cause_read() >> 8) &0xff;
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    for (i = 0; i < 8; i++) {
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        if (cause & (1 << i)) {
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            switch (i) {
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                case 0: /* SW0 - Software interrupt 0 */
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                    cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */
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                    break;
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                case 1: /* SW1 - Software interrupt 1 */
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                    cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */
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                    break;
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                case 2: /* IRQ0 */
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                case KEYBOARD_IRQ:
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                    keyboard();
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                    break;
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                case 4: /* IRQ2 */
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                case 5: /* IRQ3 */
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                case 6: /* IRQ4 */
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                default:
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                    print_regdump(pstate);
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                    panic("unhandled interrupt %d\n", i);
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                    break;
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                case TIMER_IRQ:
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                    /* clear timer interrupt & set new */
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                    cp0_compare_write(cp0_count_read() + cp0_compare_value);
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                    clock();
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                    break;
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            }
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        }
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    }
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}