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/*

 * 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.

 */

#include <arch/interrupt.h>

#include <syscall/syscall.h>

#include <print.h>

#include <debug.h>

#include <panic.h>

#include <arch/i8259.h>

#include <func.h>

#include <cpu.h>

#include <arch/asm.h>

#include <mm/tlb.h>

#include <mm/as.h>

#include <arch.h>

#include <symtab.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>

/*

 * Interrupt and exception dispatching.

 */

void (* disable_irqs_function)(__u16 irqmask) = NULL;

void (* enable_irqs_function)(__u16 irqmask) = NULL;

void (* eoi_function)(void) = NULL;

static void PRINT_INFO_ERRCODE(istate_t *istate)

{

    char *symbol = get_symtab_entry(istate->eip);

    if (!symbol)

        symbol = "";

    if (CPU)

        printf("----------------EXCEPTION OCCURED (cpu%d)----------------\n", CPU->id);

    else

        printf("----------------EXCEPTION OCCURED----------------\n");

    printf("%%eip: %#x (%s)\n",istate->eip,symbol);

    printf("ERROR_WORD=%#x\n", istate->error_word);

    printf("%%cs=%#x,flags=%#x\n", istate->cs, istate->eflags);

    printf("%%eax=%#x, %%ecx=%#x, %%edx=%#x, %%esp=%#x\n",  istate->eax,istate->ecx,istate->edx,&istate->stack[0]);

#ifdef CONFIG_DEBUG_ALLREGS

    printf("%%esi=%#x, %%edi=%#x, %%ebp=%#x, %%ebx=%#x\n",  istate->esi,istate->edi,istate->ebp,istate->ebx);

#endif

    printf("stack: %#x, %#x, %#x, %#x\n", istate->stack[0], istate->stack[1], istate->stack[2], istate->stack[3]);

    printf("       %#x, %#x, %#x, %#x\n", istate->stack[4], istate->stack[5], istate->stack[6], istate->stack[7]);

}

void null_interrupt(int n, istate_t *istate)

{

    PRINT_INFO_ERRCODE(istate);

    panic("unserviced interrupt: %d\n", n);

}

/** General Protection Fault. */

void gp_fault(int n, istate_t *istate)

{

    if (TASK) {

        count_t ver;

        spinlock_lock(&TASK->lock);

        ver = TASK->arch.iomapver;

        spinlock_unlock(&TASK->lock);

        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;

        }

    }

    PRINT_INFO_ERRCODE(istate);

    panic("general protection fault\n");

}

void ss_fault(int n, istate_t *istate)

{

    PRINT_INFO_ERRCODE(istate);

    panic("stack fault\n");

}

void simd_fp_exception(int n, istate_t *istate)

{

    PRINT_INFO_ERRCODE(istate);

    __u32 mxcsr;

    asm

    (

        "stmxcsr %0;\n"

        :"=m"(mxcsr)

    );

    printf("MXCSR: %#zX\n",(__native)(mxcsr));

    panic("SIMD FP exception(19)\n");

}

void nm_fault(int n, istate_t *istate)

{

#ifdef CONFIG_FPU_LAZY     

    scheduler_fpu_lazy_request();

#else

    panic("fpu fault");

#endif

}

void page_fault(int n, istate_t *istate)

{

    __address page;

    page = read_cr2();

    if (!as_page_fault(page)) {

        PRINT_INFO_ERRCODE(istate);

        printf("page fault address: %#x\n", page);

        panic("page fault\n");

    }

}

void syscall(int n, istate_t *istate)

{

    panic("Obsolete syscall handler.");

}

void tlb_shootdown_ipi(int n, istate_t *istate)

{

    trap_virtual_eoi();

    tlb_shootdown_ipi_recv();

}

void trap_virtual_enable_irqs(__u16 irqmask)

{

    if (enable_irqs_function)

        enable_irqs_function(irqmask);

    else

        panic("no enable_irqs_function\n");

}

void trap_virtual_disable_irqs(__u16 irqmask)

{

    if (disable_irqs_function)

        disable_irqs_function(irqmask);

    else

        panic("no disable_irqs_function\n");

}

void trap_virtual_eoi(void)

{

    if (eoi_function)

        eoi_function();

    else

        panic("no eoi_function\n");

}

static void ipc_int(int n, istate_t *istate)

{

    trap_virtual_eoi();

    ipc_irq_send_notif(n-IVT_IRQBASE);

}

/* Reregister irq to be IPC-ready */

void irq_ipc_bind_arch(__native irq)

{

    if (irq == IRQ_CLK)

        return;

    exc_register(IVT_IRQBASE+irq, "ipc_int", ipc_int);

}