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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 disabled_fp_register(__u64 vector, istate_t *istate)

{

#ifdef CONFIG_CPU_LAZY

	scheduler_fpu_lazy_request();	

#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;

	}

}