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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>

/*
 * 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);
}

void gp_fault(int n, istate_t *istate)
{
    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: %X\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");

}