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/*

 * Copyright (C) 2005 Jakub Jermar

 * Copyright (C) 2005 Jakub Vana

 * 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 <panic.h>

#include <print.h>

#include <console/console.h>

#include <arch/types.h>

#include <arch/asm.h>

#include <arch/barrier.h>

#include <arch/register.h>

#include <arch/drivers/it.h>

#include <arch.h>

#include <symtab.h>

#include <debug.h>

#include <syscall/syscall.h>

#include <print.h>

#include <proc/scheduler.h>

#define VECTORS_64_BUNDLE   20

#define VECTORS_16_BUNDLE   48

#define VECTORS_16_BUNDLE_START 0x5000

#define VECTOR_MAX      0x7f00

#define BUNDLE_SIZE     16

char *vector_names_64_bundle[VECTORS_64_BUNDLE] = {

    "VHPT Translation vector",

    "Instruction TLB vector",

    "Data TLB vector",

    "Alternate Instruction TLB vector",

    "Alternate Data TLB vector",

    "Data Nested TLB vector",

    "Instruction Key Miss vector",

    "Data Key Miss vector",

    "Dirty-Bit vector",

    "Instruction Access-Bit vector",

    "Data Access-Bit vector"

    "Break Instruction vector",

    "External Interrupt vector"

    "Reserved",

    "Reserved",

    "Reserved",

    "Reserved",

    "Reserved",

    "Reserved",

    "Reserved"

};

char *vector_names_16_bundle[VECTORS_16_BUNDLE] = {

    "Page Not Present vector",

    "Key Permission vector",

    "Instruction Access rights vector",

    "Data Access Rights vector",

    "General Exception vector",

    "Disabled FP-Register vector",

    "NaT Consumption vector",

    "Speculation vector",

    "Reserved",

    "Debug vector",

    "Unaligned Reference vector",

    "Unsupported Data Reference vector",

    "Floating-point Fault vector",

    "Floating-point Trap vector",

    "Lower-Privilege Transfer Trap vector",

    "Taken Branch Trap vector",

    "Single STep Trap vector",

    "Reserved",

    "Reserved",

    "Reserved",

    "Reserved",

    "Reserved",

    "Reserved",

    "Reserved",

    "Reserved",

    "IA-32 Exception vector",

    "IA-32 Intercept vector",

    "IA-32 Interrupt vector",

    "Reserved",

    "Reserved",

    "Reserved"

};

static char *vector_to_string(__u16 vector);

static void dump_interrupted_context(istate_t *istate);

char *vector_to_string(__u16 vector)

{

    ASSERT(vector <= VECTOR_MAX);

    if (vector >= VECTORS_16_BUNDLE_START)

        return vector_names_16_bundle[(vector-VECTORS_16_BUNDLE_START)/(16*BUNDLE_SIZE)];

    else

        return vector_names_64_bundle[vector/(64*BUNDLE_SIZE)];

}

void dump_interrupted_context(istate_t *istate)

{

    char *ifa, *iipa, *iip;

    ifa = get_symtab_entry(istate->cr_ifa);

    iipa = get_symtab_entry(istate->cr_iipa);

    iip = get_symtab_entry(istate->cr_iip);

    putchar('\n');

    printf("Interrupted context dump:\n");

    printf("ar.bsp=%P\tar.bspstore=%P\n", istate->ar_bsp, istate->ar_bspstore);

    printf("ar.rnat=%Q\tar.rsc=%Q\n", istate->ar_rnat, istate->ar_rsc);

    printf("ar.ifs=%Q\tar.pfs=%Q\n", istate->ar_ifs, istate->ar_pfs);

    printf("cr.isr=%Q\tcr.ipsr=%Q\t\n", istate->cr_isr.value, istate->cr_ipsr);

    printf("cr.iip=%Q, #%d\t(%s)\n", istate->cr_iip, istate->cr_isr.ei ,iip ? iip : "?");

    printf("cr.iipa=%Q\t(%s)\n", istate->cr_iipa, iipa ? iipa : "?");

    printf("cr.ifa=%Q\t(%s)\n", istate->cr_ifa, ifa ? ifa : "?");

}

void general_exception(__u64 vector, istate_t *istate)

{

    char *desc = "";

    dump_interrupted_context(istate);

    switch (istate->cr_isr.ge_code) {

        case GE_ILLEGALOP:

        desc = "Illegal Operation fault";

        break;

        case GE_PRIVOP:

        desc = "Privileged Operation fault";

        break;

        case GE_PRIVREG:

        desc = "Privileged Register fault";

        break;

        case GE_RESREGFLD:

        desc = "Reserved Register/Field fault";

        break;

        case GE_DISBLDISTRAN:

        desc = "Disabled Instruction Set Transition fault";

        break;

        case GE_ILLEGALDEP:

        desc = "Illegal Dependency fault";

        break;

        default:

            desc = "unknown";

        break;

    }

    panic("General Exception (%s)\n", desc);

}

void fpu_enable(void);

void disabled_fp_register(__u64 vector, istate_t *istate)

{

#ifdef CONFIG_FPU_LAZY 

    scheduler_fpu_lazy_request();  

#else

    dump_interrupted_context(istate);

    panic("Interruption: %W (%s)\n", (__u16) vector, vector_to_string(vector));

#endif

}

void nop_handler(__u64 vector, istate_t *istate)

{

}

/** Handle syscall. */

int break_instruction(__u64 vector, istate_t *istate)

{

    /*

     * Move to next instruction after BREAK.

     */

    if (istate->cr_ipsr.ri == 2) {

        istate->cr_ipsr.ri = 0;

        istate->cr_iip += 16;

    } else {

        istate->cr_ipsr.ri++;

    }

    if (istate->in4 < SYSCALL_END)

        return syscall_table[istate->in4](istate->in0, istate->in1, istate->in2, istate->in3);

    else

        panic("Undefined syscall %d", istate->in4);

    return -1;

}

void universal_handler(__u64 vector, istate_t *istate)

{

    dump_interrupted_context(istate);

    panic("Interruption: %W (%s)\n", (__u16) vector, vector_to_string(vector));

}

void external_interrupt(__u64 vector, istate_t *istate)

{

    cr_ivr_t ivr;

    ivr.value = ivr_read();

    srlz_d();

    switch(ivr.vector) {

        case INTERRUPT_TIMER:

        it_interrupt();

            break;

        case INTERRUPT_SPURIOUS:

            printf("cpu%d: spurious interrupt\n", CPU->id);

        break;

        default:

        panic("\nUnhandled External Interrupt Vector %d\n", ivr.vector);

        break;

    }

}