FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/interrupt.c

     /*-
      * 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.
     *
     * $FreeBSD$
     */
    
    /*
     * 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);
                   if (pmc_hook && (PCPU_GET(curthread)->td_pflags & TDP_CALLCHAIN))
                           pmc_hook(PCPU_GET(curthread), PMC_FN_USER_CALLCHAIN, framep);
                   critical_exit();
                   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);
           }               
   }

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