epapr.c

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/*
 * Bootwrapper for ePAPR compliant firmwares
 *
 * Copyright 2010 David Gibson <[email protected]>, IBM Corporation.
 *
 * Based on earlier bootwrappers by:
 * (c) Benjamin Herrenschmidt <[email protected]>, IBM Corp,\
 *   and
 * Scott Wood <[email protected]>
 * Copyright (c) 2007 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 */

#include "ops.h"
#include "stdio.h"
#include "io.h"
#include <libfdt.h>

BSS_STACK(4096);

#define EPAPR_SMAGIC    0x65504150
#define EPAPR_EMAGIC    0x45504150

static unsigned epapr_magic;
static unsigned long ima_size;
static unsigned long fdt_addr;

static void platform_fixups(void)
{
    if ((epapr_magic != EPAPR_EMAGIC)
        && (epapr_magic != EPAPR_SMAGIC))
        fatal("r6 contained 0x%08x instead of ePAPR magic number\n",
              epapr_magic);

    if (ima_size < (unsigned long)_end)
        printf("WARNING: Image loaded outside IMA!"
               " (_end=%p, ima_size=0x%lx)\n", _end, ima_size);
    if (ima_size < fdt_addr)
        printf("WARNING: Device tree address is outside IMA!"
               "(fdt_addr=0x%lx, ima_size=0x%lx)\n", fdt_addr,
               ima_size);
    if (ima_size < fdt_addr + fdt_totalsize((void *)fdt_addr))
        printf("WARNING: Device tree extends outside IMA!"
               " (fdt_addr=0x%lx, size=0x%x, ima_size=0x%lx\n",
               fdt_addr, fdt_totalsize((void *)fdt_addr), ima_size);
}

void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
           unsigned long r6, unsigned long r7)
{
    epapr_magic = r6;
    ima_size = r7;
    fdt_addr = r3;

    /* FIXME: we should process reserve entries */

    simple_alloc_init(_end, ima_size - (unsigned long)_end, 32, 64);

    fdt_init((void *)fdt_addr);

    serial_console_init();
    platform_ops.fixups = platform_fixups;
}