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e7e6862a | 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> | |
77a79592 | 26 | #include <grub/i18n.h> |
e7e6862a | 27 | |
28 | static grub_efi_guid_t acpi_guid = GRUB_EFI_ACPI_TABLE_GUID; | |
29 | static grub_efi_guid_t acpi2_guid = GRUB_EFI_ACPI_20_TABLE_GUID; | |
30 | static grub_efi_guid_t smbios_guid = GRUB_EFI_SMBIOS_TABLE_GUID; | |
31 | ||
32 | #define EBDA_SEG_ADDR 0x40e | |
33 | #define LOW_MEM_ADDR 0x413 | |
34 | #define FAKE_EBDA_SEG 0x9fc0 | |
35 | ||
36 | #define BLANK_MEM 0xffffffff | |
37 | #define VBIOS_ADDR 0xc0000 | |
38 | #define SBIOS_ADDR 0xf0000 | |
39 | ||
40 | static int | |
41 | enable_rom_area (void) | |
42 | { | |
43 | grub_pci_address_t addr; | |
44 | grub_uint32_t *rom_ptr; | |
181aaf0e | 45 | grub_pci_device_t dev = { .bus = 0, .device = 0, .function = 0}; |
e7e6862a | 46 | |
47 | rom_ptr = (grub_uint32_t *) VBIOS_ADDR; | |
48 | if (*rom_ptr != BLANK_MEM) | |
49 | { | |
941903f2 | 50 | grub_printf ("ROM image is present.\n"); |
e7e6862a | 51 | return 0; |
52 | } | |
53 | ||
181aaf0e | 54 | addr = grub_pci_make_address (dev, 36); |
e7e6862a | 55 | grub_pci_write_byte (addr++, 0x30); |
56 | grub_pci_write_byte (addr++, 0x33); | |
57 | grub_pci_write_byte (addr++, 0x33); | |
58 | grub_pci_write_byte (addr++, 0x33); | |
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, 0); | |
63 | ||
64 | *rom_ptr = 0; | |
65 | if (*rom_ptr != 0) | |
66 | { | |
941903f2 | 67 | grub_printf ("Can\'t enable ROM area.\n"); |
e7e6862a | 68 | return 0; |
69 | } | |
70 | ||
71 | return 1; | |
72 | } | |
73 | ||
74 | static void | |
75 | lock_rom_area (void) | |
76 | { | |
77 | grub_pci_address_t addr; | |
181aaf0e | 78 | grub_pci_device_t dev = { .bus = 0, .device = 0, .function = 0}; |
e7e6862a | 79 | |
181aaf0e | 80 | addr = grub_pci_make_address (dev, 36); |
e7e6862a | 81 | grub_pci_write_byte (addr++, 0x10); |
82 | grub_pci_write_byte (addr++, 0x11); | |
83 | grub_pci_write_byte (addr++, 0x11); | |
84 | grub_pci_write_byte (addr++, 0x11); | |
85 | grub_pci_write_byte (addr, 0x11); | |
86 | } | |
87 | ||
88 | static void | |
89 | fake_bios_data (int use_rom) | |
90 | { | |
91 | unsigned i; | |
92 | void *acpi, *smbios; | |
93 | grub_uint16_t *ebda_seg_ptr, *low_mem_ptr; | |
94 | ||
95 | ebda_seg_ptr = (grub_uint16_t *) EBDA_SEG_ADDR; | |
96 | low_mem_ptr = (grub_uint16_t *) LOW_MEM_ADDR; | |
97 | if ((*ebda_seg_ptr) || (*low_mem_ptr)) | |
98 | return; | |
99 | ||
100 | acpi = 0; | |
101 | smbios = 0; | |
102 | for (i = 0; i < grub_efi_system_table->num_table_entries; i++) | |
103 | { | |
104 | grub_efi_guid_t *guid = | |
105 | &grub_efi_system_table->configuration_table[i].vendor_guid; | |
106 | ||
107 | if (! grub_memcmp (guid, &acpi2_guid, sizeof (grub_efi_guid_t))) | |
108 | { | |
109 | acpi = grub_efi_system_table->configuration_table[i].vendor_table; | |
110 | grub_dprintf ("efi", "ACPI2: %p\n", acpi); | |
111 | } | |
112 | else if (! grub_memcmp (guid, &acpi_guid, sizeof (grub_efi_guid_t))) | |
113 | { | |
114 | void *t; | |
115 | ||
116 | t = grub_efi_system_table->configuration_table[i].vendor_table; | |
117 | if (! acpi) | |
118 | acpi = t; | |
119 | grub_dprintf ("efi", "ACPI: %p\n", t); | |
120 | } | |
121 | else if (! grub_memcmp (guid, &smbios_guid, sizeof (grub_efi_guid_t))) | |
122 | { | |
123 | smbios = grub_efi_system_table->configuration_table[i].vendor_table; | |
124 | grub_dprintf ("efi", "SMBIOS: %p\n", smbios); | |
125 | } | |
126 | } | |
127 | ||
128 | *ebda_seg_ptr = FAKE_EBDA_SEG; | |
129 | *low_mem_ptr = (FAKE_EBDA_SEG >> 6); | |
130 | ||
131 | *((grub_uint16_t *) (FAKE_EBDA_SEG << 4)) = 640 - *low_mem_ptr; | |
132 | ||
133 | if (acpi) | |
134 | grub_memcpy ((char *) ((FAKE_EBDA_SEG << 4) + 16), acpi, 1024 - 16); | |
135 | ||
136 | if ((use_rom) && (smbios)) | |
137 | grub_memcpy ((char *) SBIOS_ADDR, (char *) smbios + 16, 16); | |
138 | } | |
139 | ||
140 | static grub_err_t | |
141 | grub_cmd_fakebios (struct grub_command *cmd __attribute__ ((unused)), | |
142 | int argc __attribute__ ((unused)), | |
143 | char *argv[] __attribute__ ((unused))) | |
144 | { | |
145 | if (enable_rom_area ()) | |
146 | { | |
147 | fake_bios_data (1); | |
148 | lock_rom_area (); | |
149 | } | |
150 | else | |
151 | fake_bios_data (0); | |
a96df3f2 | 152 | |
153 | return 0; | |
e7e6862a | 154 | } |
155 | ||
156 | static grub_err_t | |
157 | grub_cmd_loadbios (grub_command_t cmd __attribute__ ((unused)), | |
158 | int argc, char *argv[]) | |
159 | { | |
160 | grub_file_t file; | |
161 | int size; | |
162 | ||
163 | if (argc == 0) | |
61ba42be | 164 | return grub_error (GRUB_ERR_BAD_ARGUMENT, "no ROM image specified"); |
e7e6862a | 165 | |
166 | if (argc > 1) | |
167 | { | |
168 | file = grub_file_open (argv[1]); | |
169 | if (! file) | |
170 | return grub_errno; | |
171 | ||
172 | if (file->size != 4) | |
7fd0baee | 173 | grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid int10 dump size"); |
e7e6862a | 174 | else |
5c5215d5 | 175 | grub_file_read (file, (void *) 0x40, 4); |
e7e6862a | 176 | |
177 | grub_file_close (file); | |
178 | if (grub_errno) | |
179 | return grub_errno; | |
180 | } | |
181 | ||
182 | file = grub_file_open (argv[0]); | |
183 | if (! file) | |
184 | return grub_errno; | |
185 | ||
186 | size = file->size; | |
187 | if ((size < 0x10000) || (size > 0x40000)) | |
7fd0baee | 188 | grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid bios dump size"); |
e7e6862a | 189 | else if (enable_rom_area ()) |
190 | { | |
5c5215d5 | 191 | grub_file_read (file, (void *) VBIOS_ADDR, size); |
e7e6862a | 192 | fake_bios_data (size <= 0x40000); |
193 | lock_rom_area (); | |
194 | } | |
195 | ||
196 | grub_file_close (file); | |
197 | return grub_errno; | |
198 | } | |
199 | ||
200 | static grub_command_t cmd_fakebios, cmd_loadbios; | |
201 | ||
202 | GRUB_MOD_INIT(loadbios) | |
203 | { | |
e7e6862a | 204 | cmd_fakebios = grub_register_command ("fakebios", grub_cmd_fakebios, |
77a79592 | 205 | 0, N_("Fake bios.")); |
e7e6862a | 206 | |
207 | cmd_loadbios = grub_register_command ("loadbios", grub_cmd_loadbios, | |
fdcdbb66 | 208 | "BIOS_DUMP [INT10_DUMP]", |
77a79592 | 209 | N_("Load bios dump.")); |
e7e6862a | 210 | } |
211 | ||
212 | GRUB_MOD_FINI(loadbios) | |
213 | { | |
214 | grub_unregister_command (cmd_fakebios); | |
215 | grub_unregister_command (cmd_loadbios); | |
216 | } |