kern/ieee1275/cmain.c

   1 /* cmain.c - Startup code for the PowerPC.  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2003,2004,2005,2006,2007,2008  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/kernel.h>
  21 #include <grub/misc.h>
  22 #include <grub/types.h>
  23 #include <grub/machine/kernel.h>
  24 #include <grub/ieee1275/ieee1275.h>
  25
  26 int (*grub_ieee1275_entry_fn) (void *);
  27
  28 grub_ieee1275_phandle_t grub_ieee1275_chosen;
  29 grub_ieee1275_ihandle_t grub_ieee1275_mmu;
  30
  31 static grub_uint32_t grub_ieee1275_flags;
  32 \f
  33
  34
  35 int
  36 grub_ieee1275_test_flag (enum grub_ieee1275_flag flag)
  37 {
  38   return (grub_ieee1275_flags & (1 << flag));
  39 }
  40
  41 void
  42 grub_ieee1275_set_flag (enum grub_ieee1275_flag flag)
  43 {
  44   grub_ieee1275_flags |= (1 << flag);
  45 }
  46
  47 #define SF "SmartFirmware(tm)"
  48 #define OHW "PPC Open Hack'Ware"
  49
  50 static void
  51 grub_ieee1275_find_options (void)
  52 {
  53   grub_ieee1275_phandle_t root;
  54   grub_ieee1275_phandle_t options;
  55   grub_ieee1275_phandle_t openprom;
  56   grub_ieee1275_phandle_t bootrom;
  57   int rc;
  58   grub_uint32_t realmode = 0;
  59   char tmp[32];
  60   int is_smartfirmware = 0;
  61   int is_olpc = 0;
  62
  63   grub_ieee1275_finddevice ("/", &root);
  64   grub_ieee1275_finddevice ("/options", &options);
  65   grub_ieee1275_finddevice ("/openprom", &openprom);
  66
  67   rc = grub_ieee1275_get_integer_property (options, "real-mode?", &realmode,
  68                                            sizeof realmode, 0);
  69   if (((rc >= 0) && realmode) || (grub_ieee1275_mmu == 0))
  70     grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_REAL_MODE);
  71
  72   rc = grub_ieee1275_get_property (openprom, "CodeGen-copyright",
  73                                    tmp, sizeof (tmp), 0);
  74   if (rc >= 0 && !grub_strncmp (tmp, SF, sizeof (SF) - 1))
  75     is_smartfirmware = 1;
  76
  77   rc = grub_ieee1275_get_property (root, "architecture",
  78                                    tmp, sizeof (tmp), 0);
  79   if (rc >= 0 && !grub_strcmp (tmp, "OLPC"))
  80     is_olpc = 1;
  81
  82   if (is_smartfirmware)
  83     {
  84       /* Broken in all versions */
  85       grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_BROKEN_OUTPUT);
  86
  87       /* There are two incompatible ways of checking the version number.  Try
  88          both. */
  89       rc = grub_ieee1275_get_property (openprom, "SmartFirmware-version",
  90                                        tmp, sizeof (tmp), 0);
  91       if (rc < 0)
  92         rc = grub_ieee1275_get_property (openprom, "firmware-version",
  93                                          tmp, sizeof (tmp), 0);
  94       if (rc >= 0)
  95         {
  96           /* It is tempting to implement a version parser to set the flags for
  97              e.g. 1.3 and below.  However, there's a special situation here.
  98              3rd party updates which fix the partition bugs are common, and for
  99              some reason their fixes aren't being merged into trunk.  So for
 100              example we know that 1.2 and 1.3 are broken, but there's 1.2.99
 101              and 1.3.99 which are known good (and applying this workaround
 102              would cause breakage). */
 103           if (!grub_strcmp (tmp, "1.0")
 104               || !grub_strcmp (tmp, "1.1")
 105               || !grub_strcmp (tmp, "1.2")
 106               || !grub_strcmp (tmp, "1.3"))
 107             {
 108               grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_PARTITION_0);
 109               grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_0_BASED_PARTITIONS);
 110             }
 111         }
 112     }
 113
 114   if (is_olpc)
 115     {
 116       /* OLPC / XO laptops have three kinds of storage devices:
 117
 118          - NAND flash.  These are accessible via OFW callbacks, but:
 119            - Follow strange semantics, imposed by hardware constraints.
 120            - Its ABI is undocumented, and not stable.
 121            They lack "device_type" property, which conveniently makes GRUB
 122            skip them.
 123
 124          - USB drives.  Not accessible, because OFW shuts down the controller
 125            in order to prevent collisions with applications accessing it
 126            directly.  Even worse, attempts to access it will NOT return
 127            control to the caller, so we have to avoid probing them.
 128
 129          - SD cards.  These work fine.
 130
 131          To avoid breakage, we only need to skip USB probing.  However,
 132          since detecting SD cards is more reliable, we do that instead.
 133       */
 134
 135       grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_OFDISK_SDCARD_ONLY);
 136     }
 137
 138   if (! grub_ieee1275_finddevice ("/rom/boot-rom", &bootrom))
 139     {
 140       rc = grub_ieee1275_get_property (bootrom, "model", tmp, sizeof (tmp), 0);
 141       if (rc >= 0 && !grub_strncmp (tmp, OHW, sizeof (OHW) - 1))
 142         {
 143           grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_BROKEN_OUTPUT);
 144           grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_CANNOT_SET_COLORS);
 145           grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_CANNOT_INTERPRET);
 146           grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_FORCE_CLAIM);
 147           grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_ANSI);
 148         }
 149     }
 150 }
 151
 152 #undef SF
 153 #undef OHW
 154
 155 void
 156 grub_ieee1275_init (void)
 157 {
 158   grub_ieee1275_finddevice ("/chosen", &grub_ieee1275_chosen);
 159
 160   if (grub_ieee1275_get_integer_property (grub_ieee1275_chosen, "mmu", &grub_ieee1275_mmu,
 161                                           sizeof grub_ieee1275_mmu, 0) < 0)
 162     grub_ieee1275_mmu = 0;
 163
 164   grub_ieee1275_find_options ();
 165 }