LXR linux/arch/powerpc/boot/epapr.c

   1/*
   2 * Bootwrapper for ePAPR compliant firmwares
   3 *
   4 * Copyright 2010 David Gibson <david@gibson.dropbear.id.au>, IBM Corporation.
   5 *
   6 * Based on earlier bootwrappers by:
   7 * (c) Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp,\
   8 *   and
   9 * Scott Wood <scottwood@freescale.com>
  10 * Copyright (c) 2007 Freescale Semiconductor, Inc.
  11 *
  12 * This program is free software; you can redistribute it and/or modify it
  13 * under the terms of the GNU General Public License version 2 as published
  14 * by the Free Software Foundation.
  15 */
  16
  17#include "ops.h"
  18#include "stdio.h"
  19#include "io.h"
  20#include <libfdt.h>
  21
  22BSS_STACK(4096);
  23
  24#define EPAPR_SMAGIC    0x65504150
  25#define EPAPR_EMAGIC    0x45504150
  26
  27static unsigned epapr_magic;
  28static unsigned long ima_size;
  29static unsigned long fdt_addr;
  30
  31static void platform_fixups(void)
  32{
  33        if ((epapr_magic != EPAPR_EMAGIC)
  34            && (epapr_magic != EPAPR_SMAGIC))
  35                fatal("r6 contained 0x%08x instead of ePAPR magic number\n",
  36                      epapr_magic);
  37
  38        if (ima_size < (unsigned long)_end)
  39                printf("WARNING: Image loaded outside IMA!"
  40                       " (_end=%p, ima_size=0x%lx)\n", _end, ima_size);
  41        if (ima_size < fdt_addr)
  42                printf("WARNING: Device tree address is outside IMA!"
  43                       "(fdt_addr=0x%lx, ima_size=0x%lx)\n", fdt_addr,
  44                       ima_size);
  45        if (ima_size < fdt_addr + fdt_totalsize((void *)fdt_addr))
  46                printf("WARNING: Device tree extends outside IMA!"
  47                       " (fdt_addr=0x%lx, size=0x%x, ima_size=0x%lx\n",
  48                       fdt_addr, fdt_totalsize((void *)fdt_addr), ima_size);
  49}
  50
  51void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
  52                         unsigned long r6, unsigned long r7)
  53{
  54        epapr_magic = r6;
  55        ima_size = r7;
  56        fdt_addr = r3;
  57
  58        /* FIXME: we should process reserve entries */
  59
  60        simple_alloc_init(_end, ima_size - (unsigned long)_end, 32, 64);
  61
  62        fdt_init((void *)fdt_addr);
  63
  64        serial_console_init();
  65        platform_ops.fixups = platform_fixups;
  66}
  67