grub/kern/powerpc/ieee1275/cmain.c

/* cmain.c - Startup code for the PowerPC.  */
/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2003,2004,2005,2006,2007  Free Software Foundation, Inc.
 *
 *  GRUB is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  GRUB is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <alloca.h>
#include <stdint.h>
#include <grub/kernel.h>
#include <grub/misc.h>
#include <grub/types.h>
#include <grub/machine/kernel.h>
#include <grub/ieee1275/ieee1275.h>

int (*grub_ieee1275_entry_fn) (void *);

grub_ieee1275_phandle_t grub_ieee1275_chosen;

static grub_uint32_t grub_ieee1275_flags;



int
grub_ieee1275_test_flag (enum grub_ieee1275_flag flag)
{
  return (grub_ieee1275_flags & (1 << flag));
}

void
grub_ieee1275_set_flag (enum grub_ieee1275_flag flag)
{
  grub_ieee1275_flags |= (1 << flag);
}

static void
grub_ieee1275_find_options (void)
{
  grub_ieee1275_phandle_t options;
  grub_ieee1275_phandle_t openprom;
  int rc;
  int realmode = 0;
  char tmp[32];
  int is_smartfirmware = 0;

  grub_ieee1275_finddevice ("/options", &options);
  rc = grub_ieee1275_get_property (options, "real-mode?", &realmode,
				   sizeof realmode, 0);
  if ((rc >= 0) && realmode)
    grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_REAL_MODE);

  grub_ieee1275_finddevice ("/openprom", &openprom);

  rc = grub_ieee1275_get_property (openprom, "CodeGen-copyright",
				   tmp,	sizeof (tmp), 0);
#define SF "SmartFirmware(tm)"
  if (rc >= 0 && !grub_strncmp (tmp, SF, sizeof (SF) - 1))
    is_smartfirmware = 1;

  if (is_smartfirmware)
    {
      /* Broken in all versions */
      grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_BROKEN_OUTPUT);

      /* There are two incompatible ways of checking the version number.  Try
         both. */
      rc = grub_ieee1275_get_property (openprom, "SmartFirmware-version",
				       tmp, sizeof (tmp), 0);
      if (rc < 0)
	rc = grub_ieee1275_get_property (openprom, "firmware-version",
					 tmp, sizeof (tmp), 0);
      if (rc >= 0)
	{
	  /* It is tempting to implement a version parser to set the flags for
	     e.g. 1.3 and below.  However, there's a special situation here.
	     3rd party updates which fix the partition bugs are common, and for
	     some reason their fixes aren't being merged into trunk.  So for
	     example we know that 1.2 and 1.3 are broken, but there's 1.2.99
	     and 1.3.99 which are known good (and applying this workaround
	     would cause breakage). */
	  if (!grub_strcmp (tmp, "1.0")
	      || !grub_strcmp (tmp, "1.1")
	      || !grub_strcmp (tmp, "1.2")
	      || !grub_strcmp (tmp, "1.3"))
	    {
	      grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_PARTITION_0);
	      grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_0_BASED_PARTITIONS);
	    }
	}
    }
}

void cmain (uint32_t r3, uint32_t r4, uint32_t r5);
void
cmain (UNUSED uint32_t r3, UNUSED uint32_t r4, uint32_t r5)
{
  grub_ieee1275_entry_fn = (int (*)(void *)) r5;

  grub_ieee1275_finddevice ("/chosen", &grub_ieee1275_chosen);

  grub_ieee1275_find_options ();

  /* Now invoke the main function.  */
  grub_main ();

  /* Never reached.  */
}