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Commit | Line | Data |
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6a161fa9 | 1 | /* |
4b13b216 | 2 | * GRUB -- GRand Unified Bootloader |
924b6140 | 3 | * Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. |
6a161fa9 | 4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
4b13b216 | 20 | #include <grub/kernel.h> |
21 | #include <grub/mm.h> | |
22 | #include <grub/machine/init.h> | |
23 | #include <grub/machine/memory.h> | |
24 | #include <grub/machine/console.h> | |
25 | #include <grub/machine/biosdisk.h> | |
26 | #include <grub/machine/kernel.h> | |
27 | #include <grub/types.h> | |
28 | #include <grub/err.h> | |
29 | #include <grub/dl.h> | |
30 | #include <grub/misc.h> | |
31 | #include <grub/loader.h> | |
32 | #include <grub/env.h> | |
c04da074 | 33 | |
34 | struct mem_region | |
35 | { | |
4b13b216 | 36 | grub_addr_t addr; |
37 | grub_size_t size; | |
c04da074 | 38 | }; |
39 | ||
40 | #define MAX_REGIONS 32 | |
41 | ||
42 | static struct mem_region mem_regions[MAX_REGIONS]; | |
43 | static int num_regions; | |
44 | ||
4b13b216 | 45 | grub_addr_t grub_os_area_addr; |
46 | grub_size_t grub_os_area_size; | |
47 | grub_size_t grub_lower_mem, grub_upper_mem; | |
a5ffe966 | 48 | |
924b6140 | 49 | void |
50 | grub_arch_sync_caches (void *address __attribute__ ((unused)), | |
51 | grub_size_t len __attribute__ ((unused))) | |
52 | { | |
53 | } | |
54 | ||
a5ffe966 | 55 | static char * |
56 | make_install_device (void) | |
57 | { | |
58 | /* XXX: This should be enough. */ | |
59 | char dev[100]; | |
60 | ||
4b13b216 | 61 | grub_sprintf (dev, "(%cd%u", |
62 | (grub_boot_drive & 0x80) ? 'h' : 'f', | |
63 | grub_boot_drive & 0x7f); | |
a5ffe966 | 64 | |
4b13b216 | 65 | if (grub_install_dos_part >= 0) |
66 | grub_sprintf (dev + grub_strlen (dev), ",%u", grub_install_dos_part); | |
a5ffe966 | 67 | |
4b13b216 | 68 | if (grub_install_bsd_part >= 0) |
69 | grub_sprintf (dev + grub_strlen (dev), ",%c", grub_install_bsd_part + 'a'); | |
a5ffe966 | 70 | |
4b13b216 | 71 | grub_sprintf (dev + grub_strlen (dev), ")%s", grub_prefix); |
72 | grub_strcpy (grub_prefix, dev); | |
a5ffe966 | 73 | |
4b13b216 | 74 | return grub_prefix; |
a5ffe966 | 75 | } |
6a161fa9 | 76 | |
c04da074 | 77 | /* Add a memory region. */ |
78 | static void | |
4b13b216 | 79 | add_mem_region (grub_addr_t addr, grub_size_t size) |
c04da074 | 80 | { |
81 | if (num_regions == MAX_REGIONS) | |
82 | /* Ignore. */ | |
83 | return; | |
84 | ||
85 | mem_regions[num_regions].addr = addr; | |
86 | mem_regions[num_regions].size = size; | |
87 | num_regions++; | |
88 | } | |
89 | ||
90 | /* Compact memory regions. */ | |
91 | static void | |
92 | compact_mem_regions (void) | |
93 | { | |
94 | int i, j; | |
95 | ||
96 | /* Sort them. */ | |
97 | for (i = 0; i < num_regions - 1; i++) | |
98 | for (j = i + 1; j < num_regions; j++) | |
99 | if (mem_regions[i].addr > mem_regions[j].addr) | |
100 | { | |
101 | struct mem_region tmp = mem_regions[i]; | |
102 | mem_regions[i] = mem_regions[j]; | |
103 | mem_regions[j] = tmp; | |
104 | } | |
105 | ||
106 | /* Merge overlaps. */ | |
107 | for (i = 0; i < num_regions - 1; i++) | |
108 | if (mem_regions[i].addr + mem_regions[i].size >= mem_regions[i + 1].addr) | |
109 | { | |
110 | j = i + 1; | |
111 | ||
112 | if (mem_regions[i].addr + mem_regions[i].size | |
113 | < mem_regions[j].addr + mem_regions[j].size) | |
114 | mem_regions[i].size = (mem_regions[j].addr + mem_regions[j].size | |
115 | - mem_regions[i].addr); | |
116 | ||
4b13b216 | 117 | grub_memmove (mem_regions + j, mem_regions + j + 1, |
c04da074 | 118 | (num_regions - j - 1) * sizeof (struct mem_region)); |
119 | i--; | |
120 | } | |
121 | } | |
122 | ||
6a161fa9 | 123 | void |
4b13b216 | 124 | grub_machine_init (void) |
6a161fa9 | 125 | { |
4b13b216 | 126 | grub_uint32_t cont; |
127 | struct grub_machine_mmap_entry *entry | |
128 | = (struct grub_machine_mmap_entry *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR; | |
129 | grub_addr_t end_addr = grub_get_end_addr (); | |
c04da074 | 130 | int i; |
131 | ||
6a161fa9 | 132 | /* Initialize the console as early as possible. */ |
4b13b216 | 133 | grub_console_init (); |
6a161fa9 | 134 | |
4b13b216 | 135 | grub_lower_mem = grub_get_memsize (0) << 10; |
c04da074 | 136 | |
6a161fa9 | 137 | /* Sanity check. */ |
4b13b216 | 138 | if (grub_lower_mem < GRUB_MEMORY_MACHINE_RESERVED_END) |
139 | grub_fatal ("too small memory"); | |
1f5ab428 | 140 | |
141 | #if 0 | |
6a161fa9 | 142 | /* Turn on Gate A20 to access >1MB. */ |
4b13b216 | 143 | grub_gate_a20 (1); |
1f5ab428 | 144 | #endif |
6a161fa9 | 145 | |
146 | /* Add the lower memory into free memory. */ | |
4b13b216 | 147 | if (grub_lower_mem >= GRUB_MEMORY_MACHINE_RESERVED_END) |
148 | add_mem_region (GRUB_MEMORY_MACHINE_RESERVED_END, | |
149 | grub_lower_mem - GRUB_MEMORY_MACHINE_RESERVED_END); | |
6a161fa9 | 150 | |
4b13b216 | 151 | add_mem_region (end_addr, GRUB_MEMORY_MACHINE_RESERVED_START - end_addr); |
6a161fa9 | 152 | |
4b13b216 | 153 | /* Check if grub_get_mmap_entry works. */ |
154 | cont = grub_get_mmap_entry (entry, 0); | |
6a161fa9 | 155 | |
62ddcc8f | 156 | if (entry->size) |
6a161fa9 | 157 | do |
158 | { | |
159 | /* Avoid the lower memory. */ | |
62ddcc8f | 160 | if (entry->addr < 0x100000) |
6a161fa9 | 161 | { |
62ddcc8f | 162 | if (entry->len <= 0x100000 - entry->addr) |
6a161fa9 | 163 | goto next; |
164 | ||
62ddcc8f | 165 | entry->len -= 0x100000 - entry->addr; |
166 | entry->addr = 0x100000; | |
6a161fa9 | 167 | } |
168 | ||
169 | /* Ignore >4GB. */ | |
62ddcc8f | 170 | if (entry->addr <= 0xFFFFFFFF && entry->type == 1) |
6a161fa9 | 171 | { |
4b13b216 | 172 | grub_addr_t addr; |
173 | grub_size_t len; | |
6a161fa9 | 174 | |
4b13b216 | 175 | addr = (grub_addr_t) entry->addr; |
62ddcc8f | 176 | len = ((addr + entry->len > 0xFFFFFFFF) |
6a161fa9 | 177 | ? 0xFFFFFFFF - addr |
4b13b216 | 178 | : (grub_size_t) entry->len); |
c04da074 | 179 | add_mem_region (addr, len); |
6a161fa9 | 180 | } |
181 | ||
182 | next: | |
183 | if (! cont) | |
184 | break; | |
185 | ||
4b13b216 | 186 | cont = grub_get_mmap_entry (entry, cont); |
6a161fa9 | 187 | } |
62ddcc8f | 188 | while (entry->size); |
6a161fa9 | 189 | else |
190 | { | |
4b13b216 | 191 | grub_uint32_t eisa_mmap = grub_get_eisa_mmap (); |
6a161fa9 | 192 | |
193 | if (eisa_mmap) | |
194 | { | |
195 | if ((eisa_mmap & 0xFFFF) == 0x3C00) | |
c04da074 | 196 | add_mem_region (0x100000, (eisa_mmap << 16) + 0x100000 * 15); |
6a161fa9 | 197 | else |
198 | { | |
c04da074 | 199 | add_mem_region (0x100000, (eisa_mmap & 0xFFFF) << 10); |
200 | add_mem_region (0x1000000, eisa_mmap << 16); | |
6a161fa9 | 201 | } |
202 | } | |
203 | else | |
4b13b216 | 204 | add_mem_region (0x100000, grub_get_memsize (1) << 10); |
6a161fa9 | 205 | } |
206 | ||
c04da074 | 207 | compact_mem_regions (); |
208 | ||
209 | /* Add the memory regions to free memory, except for the region starting | |
210 | from 1MB. This region is partially used for loading OS images. | |
211 | For now, 1/4 of this is added to free memory. */ | |
212 | for (i = 0; i < num_regions; i++) | |
213 | if (mem_regions[i].addr == 0x100000) | |
214 | { | |
4b13b216 | 215 | grub_size_t quarter = mem_regions[i].size >> 2; |
c04da074 | 216 | |
4b13b216 | 217 | grub_upper_mem = mem_regions[i].size; |
218 | grub_os_area_addr = mem_regions[i].addr; | |
219 | grub_os_area_size = mem_regions[i].size - quarter; | |
220 | grub_mm_init_region ((void *) (grub_os_area_addr + grub_os_area_size), | |
c04da074 | 221 | quarter); |
222 | } | |
223 | else | |
4b13b216 | 224 | grub_mm_init_region ((void *) mem_regions[i].addr, mem_regions[i].size); |
c04da074 | 225 | |
4b13b216 | 226 | if (! grub_os_area_addr) |
227 | grub_fatal ("no upper memory"); | |
c04da074 | 228 | |
6a161fa9 | 229 | /* The memory system was initialized, thus register built-in devices. */ |
4b13b216 | 230 | grub_biosdisk_init (); |
a5ffe966 | 231 | |
db1771cf | 232 | |
a5ffe966 | 233 | /* Initialize the prefix. */ |
4b13b216 | 234 | grub_env_set ("prefix", make_install_device ()); |
6a161fa9 | 235 | } |