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/*
 * Copyright (C) 2005 Martin Decky
 * 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/mm/memory_init.h>
#include <genarch/ofw/ofw.h>
#include <panic.h>

#define MEMMAP_MAX_RECORDS 32

typedef struct {
    __u32 start;
    __u32 size;
} memmap_t;

size_t get_memory_size(void) 
{
    phandle handle = ofw_find_device("/memory");
    if (handle == -1)
        panic("No RAM\n");
    
    memmap_t memmap[MEMMAP_MAX_RECORDS];
    size_t ret = ofw_get_property(handle, "reg", &memmap, sizeof(memmap));
    if (ret == -1)
        panic("Device /memory has no reg property\n");
    
    size_t total = 0;
    int i;
    
    for (i = 0; i < MEMMAP_MAX_RECORDS; i++) {
        if (memmap[i].size == 0)
            break;
        total += memmap[i].size;
    }

    return total;
}