arch/all-pc/boot/grub2-aros/grub-core/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/ieee1275/ieee1275.h>
  24
  25 int (*grub_ieee1275_entry_fn) (void *);
  26
  27 grub_ieee1275_phandle_t grub_ieee1275_chosen;
  28 grub_ieee1275_ihandle_t grub_ieee1275_mmu;
  29
  30 static grub_uint32_t grub_ieee1275_flags;
  31 \f
  32
  33
  34 int
  35 grub_ieee1275_test_flag (enum grub_ieee1275_flag flag)
  36 {
  37   return (grub_ieee1275_flags & (1 << flag));
  38 }
  39
  40 void
  41 grub_ieee1275_set_flag (enum grub_ieee1275_flag flag)
  42 {
  43   grub_ieee1275_flags |= (1 << flag);
  44 }
  45
  46 #define SF "SmartFirmware(tm)"
  47 #define OHW "PPC Open Hack'Ware"
  48
  49 static void
  50 grub_ieee1275_find_options (void)
  51 {
  52   grub_ieee1275_phandle_t root;
  53   grub_ieee1275_phandle_t options;
  54   grub_ieee1275_phandle_t openprom;
  55   grub_ieee1275_phandle_t bootrom;
  56   int rc;
  57   grub_uint32_t realmode = 0;
  58   char tmp[256];
  59   int is_smartfirmware = 0;
  60   int is_olpc = 0;
  61   int is_qemu = 0;
  62   grub_ssize_t actual;
  63
  64 #ifdef __sparc__
  65   grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_PARTITION_0);
  66 #endif
  67
  68   grub_ieee1275_finddevice ("/", &root);
  69   grub_ieee1275_finddevice ("/options", &options);
  70   grub_ieee1275_finddevice ("/openprom", &openprom);
  71
  72   rc = grub_ieee1275_get_integer_property (options, "real-mode?", &realmode,
  73                                            sizeof realmode, 0);
  74   if (((rc >= 0) && realmode) || (grub_ieee1275_mmu == 0))
  75     grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_REAL_MODE);
  76
  77   rc = grub_ieee1275_get_property (openprom, "CodeGen-copyright",
  78                                    tmp, sizeof (tmp), 0);
  79   if (rc >= 0 && !grub_strncmp (tmp, SF, sizeof (SF) - 1))
  80     is_smartfirmware = 1;
  81
  82   rc = grub_ieee1275_get_property (root, "architecture",
  83                                    tmp, sizeof (tmp), 0);
  84   if (rc >= 0 && !grub_strcmp (tmp, "OLPC"))
  85     is_olpc = 1;
  86
  87   rc = grub_ieee1275_get_property (root, "model",
  88                                    tmp, sizeof (tmp), 0);
  89   if (rc >= 0 && !grub_strcmp (tmp, "Emulated PC"))
  90     is_qemu = 1;
  91
  92   if (rc >= 0 && grub_strncmp (tmp, "IBM", 3) == 0)
  93     grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_TREE_SCANNING_FOR_DISKS);
  94
  95   /* Old Macs have no key repeat, newer ones have fully working one.
  96      The ones inbetween when repeated key generates an escaoe sequence
  97      only the escape is repeated. With this workaround however a fast
  98      e.g. down arrow-ESC is perceived as down arrow-down arrow which is
  99      also annoying but is less so than the original bug of exiting from
 100      the current window on arrow repeat. To avoid unaffected users suffering
 101      from this workaround match only exact models known to have this bug.
 102    */
 103   if (rc >= 0 && grub_strcmp (tmp, "PowerBook3,3") == 0)
 104     grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_BROKEN_REPEAT);
 105
 106   rc = grub_ieee1275_get_property (root, "compatible",
 107                                    tmp, sizeof (tmp), &actual);
 108   if (rc >= 0)
 109     {
 110       char *ptr;
 111       for (ptr = tmp; ptr - tmp < actual; ptr += grub_strlen (ptr) + 1)
 112         {
 113           if (grub_memcmp (ptr, "MacRISC", sizeof ("MacRISC") - 1) == 0
 114               && (ptr[sizeof ("MacRISC") - 1] == 0
 115                   || grub_isdigit (ptr[sizeof ("MacRISC") - 1])))
 116             {
 117               grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_BROKEN_ADDRESS_CELLS);
 118               grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_OFNET_SUFFIX);
 119               grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_VIRT_TO_REAL_BROKEN);
 120               break;
 121             }
 122         }
 123     }
 124
 125   if (is_smartfirmware)
 126     {
 127       /* Broken in all versions */
 128       grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_BROKEN_OUTPUT);
 129
 130       /* There are two incompatible ways of checking the version number.  Try
 131          both. */
 132       rc = grub_ieee1275_get_property (openprom, "SmartFirmware-version",
 133                                        tmp, sizeof (tmp), 0);
 134       if (rc < 0)
 135         rc = grub_ieee1275_get_property (openprom, "firmware-version",
 136                                          tmp, sizeof (tmp), 0);
 137       if (rc >= 0)
 138         {
 139           /* It is tempting to implement a version parser to set the flags for
 140              e.g. 1.3 and below.  However, there's a special situation here.
 141              3rd party updates which fix the partition bugs are common, and for
 142              some reason their fixes aren't being merged into trunk.  So for
 143              example we know that 1.2 and 1.3 are broken, but there's 1.2.99
 144              and 1.3.99 which are known good (and applying this workaround
 145              would cause breakage). */
 146           if (!grub_strcmp (tmp, "1.0")
 147               || !grub_strcmp (tmp, "1.1")
 148               || !grub_strcmp (tmp, "1.2")
 149               || !grub_strcmp (tmp, "1.3"))
 150             {
 151               grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_PARTITION_0);
 152               grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_0_BASED_PARTITIONS);
 153             }
 154         }
 155     }
 156
 157   if (is_olpc)
 158     {
 159       /* OLPC / XO laptops have three kinds of storage devices:
 160
 161          - NAND flash.  These are accessible via OFW callbacks, but:
 162            - Follow strange semantics, imposed by hardware constraints.
 163            - Its ABI is undocumented, and not stable.
 164            They lack "device_type" property, which conveniently makes GRUB
 165            skip them.
 166
 167          - USB drives.  Not accessible, because OFW shuts down the controller
 168            in order to prevent collisions with applications accessing it
 169            directly.  Even worse, attempts to access it will NOT return
 170            control to the caller, so we have to avoid probing them.
 171
 172          - SD cards.  These work fine.
 173
 174          To avoid breakage, we only need to skip USB probing.  However,
 175          since detecting SD cards is more reliable, we do that instead.
 176       */
 177
 178       grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_OFDISK_SDCARD_ONLY);
 179       grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_HAS_CURSORONOFF);
 180     }
 181
 182   if (is_qemu)
 183     {
 184       /* OpenFirmware hangs on qemu if one requests any memory below 1.5 MiB.  */
 185       grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_PRE1_5M_CLAIM);
 186
 187       grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_HAS_CURSORONOFF);
 188     }
 189
 190   if (! grub_ieee1275_finddevice ("/rom/boot-rom", &bootrom))
 191     {
 192       rc = grub_ieee1275_get_property (bootrom, "model", tmp, sizeof (tmp), 0);
 193       if (rc >= 0 && !grub_strncmp (tmp, OHW, sizeof (OHW) - 1))
 194         {
 195           grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_BROKEN_OUTPUT);
 196           grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_CANNOT_SET_COLORS);
 197           grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_CANNOT_INTERPRET);
 198           grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_FORCE_CLAIM);
 199           grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_ANSI);
 200         }
 201     }
 202 }
 203
 204 #undef SF
 205 #undef OHW
 206
 207 void
 208 grub_ieee1275_init (void)
 209 {
 210   grub_ieee1275_finddevice ("/chosen", &grub_ieee1275_chosen);
 211
 212   if (grub_ieee1275_get_integer_property (grub_ieee1275_chosen, "mmu", &grub_ieee1275_mmu,
 213                                           sizeof grub_ieee1275_mmu, 0) < 0)
 214     grub_ieee1275_mmu = 0;
 215
 216   grub_ieee1275_find_options ();
 217 }