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
  22 BSS_STACK(4096);
  23
  24 #define EPAPR_SMAGIC    0x65504150
  25 #define EPAPR_EMAGIC    0x45504150
  26
  27 static unsigned epapr_magic;
  28 static unsigned long ima_size;
  29 static unsigned long fdt_addr;
  30
  31 static 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
  51 void 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 }