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 * Copyright (c) 2009 Jiri Svoboda

 * Copyright (c) 2009 Martin Decky

#include <arch/boot/boot.h>

#include <string.h>

#include <macros.h>

/** Extract command name from the multiboot module command line.

 *

 * @param buf      Destination buffer (will always null-terminate).

 * @param n        Size of destination buffer.

 * @param cmd_line Input string (the command line).

 *

 */

static void extract_command(char *buf, size_t n, const char *cmd_line)

{

    const char *start, *end, *cp;

    size_t max_len;

    /* Find the first space. */

    end = strchr(cmd_line, ' ');

    if (end == NULL)

        end = cmd_line + strlen(cmd_line);

    /*

     * Find last occurence of '/' before 'end'. If found, place start at

     * next character. Otherwise, place start at beginning of buffer.

     */

    cp = end;

    start = buf;

    while (cp != start) {

        if (*cp == '/') {

            start = cp + 1;

            break;

        }

        --cp;

    }

    /* Copy the command and null-terminate the string. */

    max_len = min(n - 1, (size_t) (end - start));

    strncpy(buf, start, max_len + 1);

    buf[max_len] = '\0';

}

/** C part of ia32 boot sequence.

 *

 * @param signature Should contain the multiboot signature.

 * @param mi        Pointer to the multiboot information structure.

 */

void arch_pre_main(uint32_t signature, const mb_info_t *mi)

{

    uint32_t flags;

    mb_mod_t *mods;

    uint32_t i;

    if (signature == MULTIBOOT_LOADER_MAGIC)

        flags = mi->flags;

    else {

        /* No multiboot info available. */

        flags = 0;

    }

    /* Copy module information. */

    if ((flags & MBINFO_FLAGS_MODS) != 0) {

        init.cnt = mi->mods_count;

        mods = mi->mods_addr;

        for (i = 0; i < init.cnt; i++) {

            init.tasks[i].addr = mods[i].start + 0x80000000;

            init.tasks[i].size = mods[i].end - mods[i].start;

            /* Copy command line, if available. */

            if (mods[i].string) {

                extract_command(init.tasks[i].name,

                    CONFIG_TASK_NAME_BUFLEN,

                    mods[i].string);

            } else

                init.tasks[i].name[0] = '\0';

        }

    } else

        init.cnt = 0;

    /* Copy memory map. */

    int32_t mmap_length;

    mb_mmap_t *mme;

    uint32_t size;

    if ((flags & MBINFO_FLAGS_MMAP) != 0) {

        mmap_length = mi->mmap_length;

        mme = mi->mmap_addr;

        e820counter = 0;

        i = 0;

        while (mmap_length > 0) {

            e820table[i++] = mme->mm_info;

            /* Compute address of next structure. */

            size = sizeof(mme->size) + mme->size;

            mme = ((void *) mme) + size;

            mmap_length -= size;

        }

        e820counter = i;

    } else

        e820counter = 0;

#ifdef CONFIG_SMP

    /* Copy AP bootstrap routines below 1 MB. */

    memcpy((void *) AP_BOOT_OFFSET, (void *) BOOT_OFFSET,

        (size_t) &_hardcoded_unmapped_size);

#endif

}