source: bootcd/isolinux/syslinux-6.03/com32/lib/syslinux/memscan.c

/* ----------------------------------------------------------------------- *
 *
 *   Copyright 2007-2009 H. Peter Anvin - All Rights Reserved
 *   Copyright 2009 H. Peter Anvin - All Rights Reserved
 *
 *   Permission is hereby granted, free of charge, to any person
 *   obtaining a copy of this software and associated documentation
 *   files (the "Software"), to deal in the Software without
 *   restriction, including without limitation the rights to use,
 *   copy, modify, merge, publish, distribute, sublicense, and/or
 *   sell copies of the Software, and to permit persons to whom
 *   the Software is furnished to do so, subject to the following
 *   conditions:
 *
 *   The above copyright notice and this permission notice shall
 *   be included in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 *
 * ----------------------------------------------------------------------- */

/*
 * memscan.c
 *
 * Query the system for free memory
 */

#include <syslinux/memscan.h>

static LIST_HEAD(syslinux_memscan_head);

/*
 * Add a memscan entry to the list.
 */
void syslinux_memscan_add(struct syslinux_memscan *entry)
{
    list_add(&entry->next, &syslinux_memscan_head);
}

/*
 * Build a new memscan entry and add it to the list.
 */
int syslinux_memscan_new(int func(scan_memory_callback_t, void *data))
{
    struct syslinux_memscan *entry;

    entry = malloc(sizeof *entry);
    if (!entry)
        return -1;

    entry->func = func;
    syslinux_memscan_add(entry);
    return 0;
}

int syslinux_scan_memory(scan_memory_callback_t callback, void *data)
{
    struct syslinux_memscan *entry;
    int rv = 0;

    list_for_each_entry(entry, &syslinux_memscan_head, next) {
        rv = entry->func(callback, data);
        if (rv)
            break;
    }

    return rv;
}