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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.
 */

/** @addtogroup generic 
 * @{
 */

/**
 * @file
 * @brief   Miscellaneous functions.
 */

#include <func.h>
#include <print.h>
#include <cpu.h>
#include <arch/asm.h>
#include <arch.h>
#include <console/kconsole.h>

atomic_t haltstate = {0}; /**< Halt flag */


/** Halt wrapper
 *
 * Set halt flag and halt the cpu.
 *
 */
void halt()
{
#ifdef CONFIG_DEBUG
    bool rundebugger = false;

    if (!atomic_get(&haltstate)) {
        atomic_set(&haltstate, 1);
        rundebugger = true;
    }
#else
    atomic_set(&haltstate, 1);
#endif

    interrupts_disable();
    
#if (defined(CONFIG_DEBUG)) && (defined(CONFIG_KCONSOLE))
    if (rundebugger)
        kconsole("panic", "\nLast resort kernel console ready\n", false);
#endif
    
    if (CPU)
        printf("cpu%u: halted\n", CPU->id);
    else
        printf("cpu: halted\n");
    cpu_halt();
}

/** Convert ascii representation to unative_t
 *
 * Supports 0x for hexa & 0 for octal notation.
 * Does not check for overflows, does not support negative numbers
 *
 * @param text Textual representation of number
 * @return Converted number or 0 if no valid number ofund 
 */
unative_t atoi(const char *text)
{
    int base = 10;
    unative_t result = 0;

    if (text[0] == '0' && text[1] == 'x') {
        base = 16;
        text += 2;
    } else if (text[0] == '0')
        base = 8;

    while (*text) {
        if (base != 16 && \
            ((*text >= 'A' && *text <= 'F' )
             || (*text >='a' && *text <='f')))
            break;
        if (base == 8 && *text >='8')
            break;

        if (*text >= '0' && *text <= '9') {
            result *= base;
            result += *text - '0';
        } else if (*text >= 'A' && *text <= 'F') {
            result *= base;
            result += *text - 'A' + 10;
        } else if (*text >= 'a' && *text <= 'f') {
            result *= base;
            result += *text - 'a' + 10;
        } else
            break;
        text++;
    }

    return result;
}


void order(const uint64_t val, uint64_t *rv, char *suffix)
{
    if (val > 10000000000000000000ULL) {
        *rv = val / 1000000000000000000ULL;
        *suffix = 'Z';
    } else if (val > 1000000000000000000ULL) {
        *rv = val / 1000000000000000ULL;
        *suffix = 'E';
    } else if (val > 1000000000000000ULL) {
        *rv = val / 1000000000000ULL;
        *suffix = 'T';
    } else if (val > 1000000000000ULL) {
        *rv = val / 1000000000ULL;
        *suffix = 'G';
    } else if (val > 1000000000ULL) {
        *rv = val / 1000000ULL;
        *suffix = 'M';
    } else if (val > 1000000ULL) {
        *rv = val / 1000ULL;
        *suffix = 'k';
    } else {
        *rv = val;
        *suffix = ' ';
    }
}

/** @}
 */