arch/all-pc/boot/grub2-aros/grub-core/commands/efi/loadbios.c

   1 /* loadbios.c - command to load a bios dump  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2009  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/dl.h>
  21 #include <grub/misc.h>
  22 #include <grub/file.h>
  23 #include <grub/efi/efi.h>
  24 #include <grub/pci.h>
  25 #include <grub/command.h>
  26 #include <grub/i18n.h>
  27
  28 GRUB_MOD_LICENSE ("GPLv3+");
  29
  30 static grub_efi_guid_t acpi_guid = GRUB_EFI_ACPI_TABLE_GUID;
  31 static grub_efi_guid_t acpi2_guid = GRUB_EFI_ACPI_20_TABLE_GUID;
  32 static grub_efi_guid_t smbios_guid = GRUB_EFI_SMBIOS_TABLE_GUID;
  33
  34 #define EBDA_SEG_ADDR   0x40e
  35 #define LOW_MEM_ADDR    0x413
  36 #define FAKE_EBDA_SEG   0x9fc0
  37
  38 #define BLANK_MEM       0xffffffff
  39 #define VBIOS_ADDR      0xc0000
  40 #define SBIOS_ADDR      0xf0000
  41
  42 static int
  43 enable_rom_area (void)
  44 {
  45   grub_pci_address_t addr;
  46   grub_uint32_t *rom_ptr;
  47   grub_pci_device_t dev = { .bus = 0, .device = 0, .function = 0};
  48
  49   rom_ptr = (grub_uint32_t *) VBIOS_ADDR;
  50   if (*rom_ptr != BLANK_MEM)
  51     {
  52       grub_puts_ (N_("ROM image is present."));
  53       return 0;
  54     }
  55
  56   /* FIXME: should be macroified.  */
  57   addr = grub_pci_make_address (dev, 144);
  58   grub_pci_write_byte (addr++, 0x30);
  59   grub_pci_write_byte (addr++, 0x33);
  60   grub_pci_write_byte (addr++, 0x33);
  61   grub_pci_write_byte (addr++, 0x33);
  62   grub_pci_write_byte (addr++, 0x33);
  63   grub_pci_write_byte (addr++, 0x33);
  64   grub_pci_write_byte (addr++, 0x33);
  65   grub_pci_write_byte (addr, 0);
  66
  67   *rom_ptr = 0;
  68   if (*rom_ptr != 0)
  69     {
  70       grub_puts_ (N_("Can\'t enable ROM area."));
  71       return 0;
  72     }
  73
  74   return 1;
  75 }
  76
  77 static void
  78 lock_rom_area (void)
  79 {
  80   grub_pci_address_t addr;
  81   grub_pci_device_t dev = { .bus = 0, .device = 0, .function = 0};
  82
  83   /* FIXME: should be macroified.  */
  84   addr = grub_pci_make_address (dev, 144);
  85   grub_pci_write_byte (addr++, 0x10);
  86   grub_pci_write_byte (addr++, 0x11);
  87   grub_pci_write_byte (addr++, 0x11);
  88   grub_pci_write_byte (addr++, 0x11);
  89   grub_pci_write_byte (addr, 0x11);
  90 }
  91
  92 static void
  93 fake_bios_data (int use_rom)
  94 {
  95   unsigned i;
  96   void *acpi, *smbios;
  97   grub_uint16_t *ebda_seg_ptr, *low_mem_ptr;
  98
  99   ebda_seg_ptr = (grub_uint16_t *) EBDA_SEG_ADDR;
 100   low_mem_ptr = (grub_uint16_t *) LOW_MEM_ADDR;
 101   if ((*ebda_seg_ptr) || (*low_mem_ptr))
 102     return;
 103
 104   acpi = 0;
 105   smbios = 0;
 106   for (i = 0; i < grub_efi_system_table->num_table_entries; i++)
 107     {
 108       grub_efi_packed_guid_t *guid =
 109         &grub_efi_system_table->configuration_table[i].vendor_guid;
 110
 111       if (! grub_memcmp (guid, &acpi2_guid, sizeof (grub_efi_guid_t)))
 112         {
 113           acpi = grub_efi_system_table->configuration_table[i].vendor_table;
 114           grub_dprintf ("efi", "ACPI2: %p\n", acpi);
 115         }
 116       else if (! grub_memcmp (guid, &acpi_guid, sizeof (grub_efi_guid_t)))
 117         {
 118           void *t;
 119
 120           t = grub_efi_system_table->configuration_table[i].vendor_table;
 121           if (! acpi)
 122             acpi = t;
 123           grub_dprintf ("efi", "ACPI: %p\n", t);
 124         }
 125       else if (! grub_memcmp (guid, &smbios_guid, sizeof (grub_efi_guid_t)))
 126         {
 127           smbios = grub_efi_system_table->configuration_table[i].vendor_table;
 128           grub_dprintf ("efi", "SMBIOS: %p\n", smbios);
 129         }
 130     }
 131
 132   *ebda_seg_ptr = FAKE_EBDA_SEG;
 133   *low_mem_ptr = (FAKE_EBDA_SEG >> 6);
 134
 135   *((grub_uint16_t *) (FAKE_EBDA_SEG << 4)) = 640 - *low_mem_ptr;
 136
 137   if (acpi)
 138     grub_memcpy ((char *) ((FAKE_EBDA_SEG << 4) + 16), acpi, 1024 - 16);
 139
 140   if ((use_rom) && (smbios))
 141     grub_memcpy ((char *) SBIOS_ADDR, (char *) smbios + 16, 16);
 142 }
 143
 144 static grub_err_t
 145 grub_cmd_fakebios (struct grub_command *cmd __attribute__ ((unused)),
 146                    int argc __attribute__ ((unused)),
 147                    char *argv[] __attribute__ ((unused)))
 148 {
 149   if (enable_rom_area ())
 150     {
 151       fake_bios_data (1);
 152       lock_rom_area ();
 153     }
 154   else
 155     fake_bios_data (0);
 156
 157   return 0;
 158 }
 159
 160 static grub_err_t
 161 grub_cmd_loadbios (grub_command_t cmd __attribute__ ((unused)),
 162                    int argc, char *argv[])
 163 {
 164   grub_file_t file;
 165   int size;
 166
 167   if (argc == 0)
 168     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
 169
 170   if (argc > 1)
 171     {
 172       file = grub_file_open (argv[1]);
 173       if (! file)
 174         return grub_errno;
 175
 176       if (file->size != 4)
 177         grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid int10 dump size");
 178       else
 179         grub_file_read (file, (void *) 0x40, 4);
 180
 181       grub_file_close (file);
 182       if (grub_errno)
 183         return grub_errno;
 184     }
 185
 186   file = grub_file_open (argv[0]);
 187   if (! file)
 188     return grub_errno;
 189
 190   size = file->size;
 191   if ((size < 0x10000) || (size > 0x40000))
 192     grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid bios dump size");
 193   else if (enable_rom_area ())
 194     {
 195       grub_file_read (file, (void *) VBIOS_ADDR, size);
 196       fake_bios_data (size <= 0x40000);
 197       lock_rom_area ();
 198     }
 199
 200   grub_file_close (file);
 201   return grub_errno;
 202 }
 203
 204 static grub_command_t cmd_fakebios, cmd_loadbios;
 205
 206 GRUB_MOD_INIT(loadbios)
 207 {
 208   cmd_fakebios = grub_register_command ("fakebios", grub_cmd_fakebios,
 209                                         0, N_("Create BIOS-like structures for"
 210                                               " backward compatibility with"
 211                                               " existing OS."));
 212
 213   cmd_loadbios = grub_register_command ("loadbios", grub_cmd_loadbios,
 214                                         N_("BIOS_DUMP [INT10_DUMP]"),
 215                                         N_("Load BIOS dump."));
 216 }
 217
 218 GRUB_MOD_FINI(loadbios)
 219 {
 220   grub_unregister_command (cmd_fakebios);
 221   grub_unregister_command (cmd_loadbios);
 222 }