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2265 hudecek 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 ia32xen_interrupt
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 * @{
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 */
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/** @file
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 */
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#include <arch/interrupt.h>
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#include <syscall/syscall.h>
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#include <print.h>
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#include <debug.h>
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#include <panic.h>
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#include <func.h>
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#include <cpu.h>
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#include <arch/asm.h>
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#include <mm/tlb.h>
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#include <mm/as.h>
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#include <arch.h>
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#include <symtab.h>
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#include <proc/thread.h>
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#include <proc/task.h>
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#include <synch/spinlock.h>
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#include <arch/ddi/ddi.h>
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#include <ipc/sysipc.h>
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#include <interrupt.h>
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#include <ddi/irq.h>
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/*
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 * Interrupt and exception dispatching.
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 */
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void (* disable_irqs_function)(uint16_t irqmask) = NULL;
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void (* enable_irqs_function)(uint16_t irqmask) = NULL;
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void (* eoi_function)(void) = NULL;
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void decode_istate(istate_t *istate)
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{
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    char *symbol = get_symtab_entry(istate->eip);
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    if (!symbol)
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        symbol = "";
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    if (CPU)
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        printf("----------------EXCEPTION OCCURED (cpu%d)----------------\n", CPU->id);
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    else
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        printf("----------------EXCEPTION OCCURED----------------\n");
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    printf("%%eip: %#x (%s)\n",istate->eip,symbol);
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    printf("ERROR_WORD=%#x\n", istate->error_word);
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    printf("%%cs=%#x,flags=%#x\n", istate->cs, istate->eflags);
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    printf("%%eax=%#x, %%ecx=%#x, %%edx=%#x, %%esp=%#x\n",  istate->eax,istate->ecx,istate->edx,&istate->stack[0]);
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#ifdef CONFIG_DEBUG_ALLREGS
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    printf("%%esi=%#x, %%edi=%#x, %%ebp=%#x, %%ebx=%#x\n",  istate->esi,istate->edi,istate->ebp,istate->ebx);
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#endif
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    printf("stack: %#x, %#x, %#x, %#x\n", istate->stack[0], istate->stack[1], istate->stack[2], istate->stack[3]);
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    printf("       %#x, %#x, %#x, %#x\n", istate->stack[4], istate->stack[5], istate->stack[6], istate->stack[7]);
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}
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static void trap_virtual_eoi(void)
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{
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    if (eoi_function)
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        eoi_function();
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    else
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        panic("no eoi_function\n");
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}
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static void null_interrupt(int n, istate_t *istate)
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{
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    fault_if_from_uspace(istate, "unserviced interrupt: %d", n);
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    decode_istate(istate);
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    panic("unserviced interrupt: %d\n", n);
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}
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/** General Protection Fault. */
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static void gp_fault(int n, istate_t *istate)
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{
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    if (TASK) {
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        count_t ver;
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        spinlock_lock(&TASK->lock);
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        ver = TASK->arch.iomapver;
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        spinlock_unlock(&TASK->lock);
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        if (CPU->arch.iomapver_copy != ver) {
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            /*
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             * This fault can be caused by an early access
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             * to I/O port because of an out-dated
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             * I/O Permission bitmap installed on CPU.
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             * Install the fresh copy and restart
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             * the instruction.
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             */
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            io_perm_bitmap_install();
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            return;
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        }
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        fault_if_from_uspace(istate, "general protection fault");
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    }
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    decode_istate(istate);
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    panic("general protection fault\n");
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}
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static void ss_fault(int n, istate_t *istate)
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{
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    fault_if_from_uspace(istate, "stack fault");
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    decode_istate(istate);
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    panic("stack fault\n");
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}
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static void simd_fp_exception(int n, istate_t *istate)
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{
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    uint32_t mxcsr;
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    asm
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    (
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        "stmxcsr %0;\n"
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        :"=m"(mxcsr)
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    );
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    fault_if_from_uspace(istate, "SIMD FP exception(19), MXCSR: %#zx",
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                 (unative_t)mxcsr);
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    decode_istate(istate);
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    printf("MXCSR: %#zx\n",(unative_t)(mxcsr));
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    panic("SIMD FP exception(19)\n");
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}
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static void nm_fault(int n, istate_t *istate)
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{
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#ifdef CONFIG_FPU_LAZY     
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    scheduler_fpu_lazy_request();
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#else
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    fault_if_from_uspace(istate, "fpu fault");
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    panic("fpu fault");
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#endif
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}
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#ifdef CONFIG_SMP
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static void tlb_shootdown_ipi(int n, istate_t *istate)
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{
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    trap_virtual_eoi();
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    tlb_shootdown_ipi_recv();
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}
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#endif
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/** Handler of IRQ exceptions */
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static void irq_interrupt(int n, istate_t *istate)
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{
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    ASSERT(n >= IVT_IRQBASE);
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    int inum = n - IVT_IRQBASE;
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    bool ack = false;
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    ASSERT(inum < IRQ_COUNT);
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    ASSERT((inum != IRQ_PIC_SPUR) && (inum != IRQ_PIC1));
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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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            /* Send EOI before processing the interrupt */
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            trap_virtual_eoi();
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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%d: 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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        trap_virtual_eoi();
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}
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void interrupt_init(void)
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{
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    int i;
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    for (i = 0; i < IVT_ITEMS; i++)
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        exc_register(i, "null", (iroutine) null_interrupt);
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    for (i = 0; i < IRQ_COUNT; i++) {
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        if ((i != IRQ_PIC_SPUR) && (i != IRQ_PIC1))
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            exc_register(IVT_IRQBASE + i, "irq", (iroutine) irq_interrupt);
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    }
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    exc_register(7, "nm_fault", (iroutine) nm_fault);
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    exc_register(12, "ss_fault", (iroutine) ss_fault);
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    exc_register(13, "gp_fault", (iroutine) gp_fault);
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    exc_register(19, "simd_fp", (iroutine) simd_fp_exception);
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#ifdef CONFIG_SMP
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    exc_register(VECTOR_TLB_SHOOTDOWN_IPI, "tlb_shootdown", (iroutine) tlb_shootdown_ipi);
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#endif
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}
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void trap_virtual_enable_irqs(uint16_t irqmask)
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{
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    if (enable_irqs_function)
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        enable_irqs_function(irqmask);
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    else
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        panic("no enable_irqs_function\n");
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}
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void trap_virtual_disable_irqs(uint16_t irqmask)
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{
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    if (disable_irqs_function)
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        disable_irqs_function(irqmask);
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    else
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        panic("no disable_irqs_function\n");
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}
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/** @}
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 */
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