/*-
 * Copyright 2002 by Peter Grehan. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Interrupts are dispatched to here from locore asm
 */

#include "opt_hwpmc_hooks.h"
#include "opt_platform.h"

#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#ifdef HWPMC_HOOKS
#include <sys/pmckern.h>
#endif
#include <sys/proc.h>
#include <sys/smp.h>
#include <sys/unistd.h>
#include <sys/vmmeter.h>

#include <machine/cpu.h>
#include <machine/clock.h>
#include <machine/db_machdep.h>
#include <machine/fpu.h>
#include <machine/frame.h>
#include <machine/intr_machdep.h>
#include <machine/md_var.h>
#include <machine/pcb.h>
#include <machine/psl.h>
#include <machine/trap.h>
#include <machine/spr.h>
#include <machine/sr.h>

#include "pic_if.h"

#ifdef POWERNV
int (*hmi_handler)(struct trapframe *);
#endif

/*
 * A very short dispatch, to try and maximise assembler code use
 * between all exception types. Maybe 'true' interrupts should go
 * here, and the trap code can come in separately
 */
void
powerpc_interrupt(struct trapframe *framep)
{
        struct thread *td;
        struct trapframe *oldframe;
        register_t ee;

        td = curthread;

        CTR2(KTR_INTR, "%s: EXC=%x", __func__, framep->exc);

        switch (framep->exc) {
        case EXC_EXI:
        case EXC_HVI:
                critical_enter();
                PIC_DISPATCH(root_pic, framep);
                critical_exit();
#ifdef BOOKE
                framep->srr1 &= ~PSL_WE;
#endif
                break;

        case EXC_DECR:
                critical_enter();
                atomic_add_int(&td->td_intr_nesting_level, 1);
                oldframe = td->td_intr_frame;
                td->td_intr_frame = framep;
                decr_intr(framep);
                td->td_intr_frame = oldframe;
                atomic_subtract_int(&td->td_intr_nesting_level, 1);
                critical_exit();
#ifdef BOOKE
                framep->srr1 &= ~PSL_WE;
#endif
                break;
#ifdef HWPMC_HOOKS
        case EXC_PERF:
                critical_enter();
                KASSERT(pmc_intr != NULL, ("Performance exception, but no handler!"));
                (*pmc_intr)(framep);
                critical_exit();
                if (pmc_hook && (PCPU_GET(curthread)->td_pflags & TDP_CALLCHAIN))
                        pmc_hook(PCPU_GET(curthread), PMC_FN_USER_CALLCHAIN, framep);
                break;
#endif

#ifdef POWERNV
        case EXC_HMI:
                if (hmi_handler != 0 && hmi_handler(framep) == 0)
                        break;
                /* If no handler, or failure to handle, just drop to trap. */
#endif

        default:
                /* Re-enable interrupts if applicable. */
                ee = framep->srr1 & PSL_EE;
                if (ee != 0)
                        mtmsr(mfmsr() | ee);
                trap(framep);
        }               
}