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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/drivers/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;

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)

{

	fault_if_from_uspace(istate, "unserviced interrupt: %d", n);

	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;

		}

		fault_if_from_uspace(istate, "general protection fault");

	}

	PRINT_INFO_ERRCODE(istate);

	panic("general protection fault\n");

}

void ss_fault(int n, istate_t *istate)

{

	fault_if_from_uspace(istate, "stack fault");

	PRINT_INFO_ERRCODE(istate);

	panic("stack fault\n");

}

void simd_fp_exception(int n, istate_t *istate)

{

	__u32 mxcsr;

	asm

	(

		"stmxcsr %0;\n"

		:"=m"(mxcsr)

	);

	fault_if_from_uspace(istate, "SIMD FP exception(19), MXCSR: %#zX",

			     (__native)mxcsr);

	PRINT_INFO_ERRCODE(istate);

	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

	fault_if_from_uspace(istate, "fpu fault");

	panic("fpu fault");

#endif

}

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)

{

	ipc_irq_send_notif(n-IVT_IRQBASE);

	trap_virtual_eoi();

}

/* Reregister irq to be IPC-ready */

void irq_ipc_bind_arch(__native irq)

{

	if (irq == IRQ_CLK)

		return;

	trap_virtual_enable_irqs(1 << irq);

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

}