/*
 * (C) Copyright 2003
 * Texas Instruments <www.ti.com>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <azu@sysgo.de>
 *
 * (C) Copyright 2002-2004
 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
 *
 * (C) Copyright 2004
 * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <asm/proc-armv/ptrace.h>

DECLARE_GLOBAL_DATA_PTR;

#ifdef CONFIG_USE_IRQ
int interrupt_init (void)
{
        /*
         * setup up stacks if necessary
         */
        IRQ_STACK_START = gd->irq_sp - 4;
        IRQ_STACK_START_IN = gd->irq_sp + 8;
        FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;

        return arch_interrupt_init();
}

/* enable IRQ interrupts */
void enable_interrupts (void)
{
        unsigned long temp;
        __asm__ __volatile__("mrs %0, cpsr\n"
                             "bic %0, %0, #0x80\n"
                             "msr cpsr_c, %0"
                             : "=r" (temp)
                             :
                             : "memory");
}


/*
 * disable IRQ/FIQ interrupts
 * returns true if interrupts had been enabled before we disabled them
 */
int disable_interrupts (void)
{
        unsigned long old,temp;
        __asm__ __volatile__("mrs %0, cpsr\n"
                             "orr %1, %0, #0xc0\n"
                             "msr cpsr_c, %1"
                             : "=r" (old), "=r" (temp)
                             :
                             : "memory");
        return (old & 0x80) == 0;
}
#else
int interrupt_init (void)
{
        /*
         * setup up stacks if necessary
         */
        IRQ_STACK_START_IN = gd->irq_sp + 8;

        return 0;
}

void enable_interrupts (void)
{
        return;
}
int disable_interrupts (void)
{
        return 0;
}
#endif


void bad_mode (void)
{
        panic ("Resetting CPU ...\n");
        reset_cpu (0);
}

void show_regs (struct pt_regs *regs)
{
        unsigned long flags;
        const char *processor_modes[] = {
        "USER_26",      "FIQ_26",       "IRQ_26",       "SVC_26",
        "UK4_26",       "UK5_26",       "UK6_26",       "UK7_26",
        "UK8_26",       "UK9_26",       "UK10_26",      "UK11_26",
        "UK12_26",      "UK13_26",      "UK14_26",      "UK15_26",
        "USER_32",      "FIQ_32",       "IRQ_32",       "SVC_32",
        "UK4_32",       "UK5_32",       "UK6_32",       "ABT_32",
        "UK8_32",       "UK9_32",       "UK10_32",      "UND_32",
        "UK12_32",      "UK13_32",      "UK14_32",      "SYS_32",
        };

        flags = condition_codes (regs);

        printf ("pc : [<%08lx>]    lr : [<%08lx>]\n"
                "sp : %08lx  ip : %08lx  fp : %08lx\n",
                instruction_pointer (regs),
                regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
        printf ("r10: %08lx  r9 : %08lx  r8 : %08lx\n",
                regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
        printf ("r7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
                regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
        printf ("r3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
                regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
        printf ("Flags: %c%c%c%c",
                flags & CC_N_BIT ? 'N' : 'n',
                flags & CC_Z_BIT ? 'Z' : 'z',
                flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
        printf ("  IRQs %s  FIQs %s  Mode %s%s\n",
                interrupts_enabled (regs) ? "on" : "off",
                fast_interrupts_enabled (regs) ? "on" : "off",
                processor_modes[processor_mode (regs)],
                thumb_mode (regs) ? " (T)" : "");
}

void do_undefined_instruction (struct pt_regs *pt_regs)
{
        printf ("undefined instruction\n");
        show_regs (pt_regs);
        bad_mode ();
}

void do_software_interrupt (struct pt_regs *pt_regs)
{
        printf ("software interrupt\n");
        show_regs (pt_regs);
        bad_mode ();
}

void do_prefetch_abort (struct pt_regs *pt_regs)
{
        printf ("prefetch abort\n");
        show_regs (pt_regs);
        bad_mode ();
}

void do_data_abort (struct pt_regs *pt_regs)
{
        printf ("data abort\n\n    MAYBE you should read doc/README.arm-unaligned-accesses\n\n");
        show_regs (pt_regs);
        bad_mode ();
}

void do_not_used (struct pt_regs *pt_regs)
{
        printf ("not used\n");
        show_regs (pt_regs);
        bad_mode ();
}

void do_fiq (struct pt_regs *pt_regs)
{
        printf ("fast interrupt request\n");
        show_regs (pt_regs);
        bad_mode ();
}

#ifndef CONFIG_USE_IRQ
void do_irq (struct pt_regs *pt_regs)
{
        printf ("interrupt request\n");
        show_regs (pt_regs);
        bad_mode ();
}
#endif