source: mainline/kernel/arch/ia32/src/interrupt.c@ f6cf76f

/*
 * Copyright (c) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - 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.
 */

/** @addtogroup kernel_ia32_interrupt
 * @{
 */
/** @file
 */

#include <arch/interrupt.h>
#include <assert.h>
#include <syscall/syscall.h>
#include <stdio.h>
#include <debug.h>
#include <panic.h>
#include <genarch/drivers/i8259/i8259.h>
#include <halt.h>
#include <cpu.h>
#include <arch/asm.h>
#include <mm/tlb.h>
#include <mm/as.h>
#include <arch.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <synch/spinlock.h>
#include <arch/ddi/ddi.h>
#include <ipc/sysipc.h>
#include <interrupt.h>
#include <ddi/irq.h>
#include <symtab.h>
#include <stacktrace.h>
#include <proc/task.h>

/*
 * Interrupt and exception dispatching.
 */

void (*disable_irqs_function)(uint16_t irqmask) = NULL;
void (*enable_irqs_function)(uint16_t irqmask) = NULL;
void (*eoi_function)(void) = NULL;
const char *irqs_info = NULL;

void istate_decode(istate_t *istate)
{
        printf("cs =%0#10" PRIx32 "\teip=%0#10" PRIx32 "\t"
            "efl=%0#10" PRIx32 "\terr=%0#10" PRIx32 "\n",
            istate->cs, istate->eip, istate->eflags, istate->error_word);

        printf("ds =%0#10" PRIx32 "\tes =%0#10" PRIx32 "\t"
            "fs =%0#10" PRIx32 "\tgs =%0#10" PRIx32 "\n",
            istate->ds, istate->es, istate->fs, istate->gs);

        if (istate_from_uspace(istate))
                printf("ss =%0#10" PRIx32 "\n", istate->ss);

        printf("eax=%0#10" PRIx32 "\tebx=%0#10" PRIx32 "\t"
            "ecx=%0#10" PRIx32 "\tedx=%0#10" PRIx32 "\n",
            istate->eax, istate->ebx, istate->ecx, istate->edx);

        printf("esi=%0#10" PRIx32 "\tedi=%0#10" PRIx32 "\t"
            "ebp=%0#10" PRIx32 "\tesp=%0#10" PRIx32 "\n",
            istate->esi, istate->edi, istate->ebp,
            istate_from_uspace(istate) ? istate->esp :
            (uint32_t) &istate->esp);
}

static void trap_virtual_eoi(void)
{
        if (eoi_function)
                eoi_function();
        else
                panic("No eoi_function.");

}

static void null_interrupt(unsigned int n, istate_t *istate)
{
        fault_if_from_uspace(istate, "Unserviced interrupt: %u.", n);
        panic_badtrap(istate, n, "Unserviced interrupt: %u.", n);
}

static void de_fault(unsigned int n, istate_t *istate)
{
        fault_if_from_uspace(istate, "Divide error.");
        panic_badtrap(istate, n, "Divide error.");
}

static void db_exception(unsigned int n, istate_t *istate)
{
        /*
         * We need to provide at least an empty handler that does not panic
         * if the exception appears to come from the kernel because the
         * userspace can inject a kernel-level #DB after e.g. the SYSENTER
         * instruction if the EFLAGS.TF is set.
         */
}

/** General Protection Fault. */
static void gp_fault(unsigned int n __attribute__((unused)), istate_t *istate)
{
        if (TASK) {
                irq_spinlock_lock(&TASK->lock, false);
                size_t ver = TASK->arch.iomapver;
                irq_spinlock_unlock(&TASK->lock, false);

                if (CPU->arch.iomapver_copy != ver) {
                        /*
                         * This fault can be caused by an early access
                         * to I/O port because of an out-dated
                         * I/O Permission bitmap installed on CPU.
                         * Install the fresh copy and restart
                         * the instruction.
                         */
                        io_perm_bitmap_install();
                        return;
                }
                fault_if_from_uspace(istate, "General protection fault.");
        }
        panic_badtrap(istate, n, "General protection fault.");
}

static void ss_fault(unsigned int n __attribute__((unused)), istate_t *istate)
{
        fault_if_from_uspace(istate, "Stack fault.");
        panic_badtrap(istate, n, "Stack fault.");
}

static void simd_fp_exception(unsigned int n __attribute__((unused)), istate_t *istate)
{
        uint32_t mxcsr;
        asm volatile (
            "stmxcsr %[mxcsr]\n"
            : [mxcsr] "=m" (mxcsr)
        );

        fault_if_from_uspace(istate, "SIMD FP exception(19), MXCSR=%#0" PRIx32 ".",
            mxcsr);
        panic_badtrap(istate, n, "SIMD FP exception");
}

static void nm_fault(unsigned int n __attribute__((unused)),
    istate_t *istate __attribute__((unused)))
{
#ifdef CONFIG_FPU_LAZY
        scheduler_fpu_lazy_request();
#else
        fault_if_from_uspace(istate, "FPU fault.");
        panic_badtrap(istate, n, "FPU fault.");
#endif
}

#ifdef CONFIG_SMP
static void tlb_shootdown_ipi(unsigned int n __attribute__((unused)),
    istate_t *istate __attribute__((unused)))
{
        trap_virtual_eoi();
        tlb_shootdown_ipi_recv();
}
#endif

/** Handler of IRQ exceptions */
static void irq_interrupt(unsigned int n, istate_t *istate __attribute__((unused)))
{
        assert(n >= IVT_IRQBASE);

        unsigned int inum = n - IVT_IRQBASE;
        bool ack = false;
        assert(inum < IRQ_COUNT);
        assert(inum != IRQ_PIC0_SPUR);
        assert(inum != IRQ_PIC1_SPUR);
        assert(inum != IRQ_PIC1);

        irq_t *irq = irq_dispatch_and_lock(inum);
        if (irq) {
                /*
                 * The IRQ handler was found.
                 */

                if (irq->preack) {
                        /* Send EOI before processing the interrupt */
                        trap_virtual_eoi();
                        ack = true;
                }
                irq->handler(irq);
                irq_spinlock_unlock(&irq->lock, false);
        } else {
                /*
                 * Spurious interrupt.
                 */
#ifdef CONFIG_DEBUG
                printf("cpu%u: spurious interrupt (inum=%u)\n", CPU->id, inum);
#endif
        }

        if (!ack)
                trap_virtual_eoi();
}

static void pic_spurious(unsigned int n, istate_t *istate)
{
        /*
         * XXX: Examine ISR to figure out whether this is indeed a spurious
         *      or actual IRQ.
         */
#ifdef CONFIG_DEBUG
        log(LF_ARCH, LVL_DEBUG, "cpu%u: PIC spurious interrupt", CPU->id);
#endif
}

void interrupt_init(void)
{
        unsigned int i;

        for (i = 0; i < IVT_ITEMS; i++)
                exc_register(i, "null", false, (iroutine_t) null_interrupt);

        for (i = 0; i < IRQ_COUNT; i++) {
                if ((i != IRQ_PIC0_SPUR) && (i != IRQ_PIC1_SPUR) &&
                    (i != IRQ_PIC1))
                        exc_register(IVT_IRQBASE + i, "irq", true,
                            (iroutine_t) irq_interrupt);
        }

        exc_register(VECTOR_DE, "de_fault", true, (iroutine_t) de_fault);
        exc_register(VECTOR_DB, "db_exc", true, (iroutine_t) db_exception);
        exc_register(VECTOR_NM, "nm_fault", true, (iroutine_t) nm_fault);
        exc_register(VECTOR_SS, "ss_fault", true, (iroutine_t) ss_fault);
        exc_register(VECTOR_GP, "gp_fault", true, (iroutine_t) gp_fault);
        exc_register(VECTOR_XM, "simd_fp", true, (iroutine_t) simd_fp_exception);
        exc_register(VECTOR_PIC0_SPUR, "pic0_spurious", true,
            (iroutine_t) pic_spurious);
        exc_register(VECTOR_PIC1_SPUR, "pic1_spurious", true,
            (iroutine_t) pic_spurious);

#ifdef CONFIG_SMP
        exc_register(VECTOR_TLB_SHOOTDOWN_IPI, "tlb_shootdown", true,
            (iroutine_t) tlb_shootdown_ipi);
#endif
}

void trap_virtual_enable_irqs(uint16_t irqmask)
{
        if (enable_irqs_function)
                enable_irqs_function(irqmask);
        else
                panic("No enable_irqs_function.");
}

void trap_virtual_disable_irqs(uint16_t irqmask)
{
        if (disable_irqs_function)
                disable_irqs_function(irqmask);
        else
                panic("No disable_irqs_function.");
}

/** @}
 */