Updated PCI IDs to latest snapshot.
[tangerine.git] / arch / common / boot / grub2 / disk / memdisk.c
blob978eae553a04bfd1068283591e6024ba81c0e131
1 /* memdisk.c - Access embedded memory disk. */
2 /*
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 2007,2008 Free Software Foundation, Inc.
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.
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.
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/>.
20 #include <grub/disk.h>
21 #include <grub/dl.h>
22 #include <grub/kernel.h>
23 #include <grub/misc.h>
24 #include <grub/mm.h>
25 #include <grub/types.h>
26 #include <grub/machine/kernel.h>
28 static char *memdisk_addr;
29 static grub_off_t memdisk_size = 0;
31 static int
32 grub_memdisk_iterate (int (*hook) (const char *name))
34 return hook ("memdisk");
37 static grub_err_t
38 grub_memdisk_open (const char *name, grub_disk_t disk)
40 if (grub_strcmp (name, "memdisk"))
41 return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a memdisk");
43 disk->total_sectors = memdisk_size / GRUB_DISK_SECTOR_SIZE;
44 disk->id = (unsigned long) "mdsk";
45 disk->has_partitions = 0;
47 return GRUB_ERR_NONE;
50 static void
51 grub_memdisk_close (grub_disk_t disk __attribute((unused)))
55 static grub_err_t
56 grub_memdisk_read (grub_disk_t disk __attribute((unused)), grub_disk_addr_t sector,
57 grub_size_t size, char *buf)
59 grub_memcpy (buf, memdisk_addr + (sector << GRUB_DISK_SECTOR_BITS), size << GRUB_DISK_SECTOR_BITS);
60 return 0;
63 static grub_err_t
64 grub_memdisk_write (grub_disk_t disk __attribute((unused)), grub_disk_addr_t sector,
65 grub_size_t size, const char *buf)
67 grub_memcpy (memdisk_addr + (sector << GRUB_DISK_SECTOR_BITS), buf, size << GRUB_DISK_SECTOR_BITS);
68 return 0;
71 static struct grub_disk_dev grub_memdisk_dev =
73 .name = "memdisk",
74 .id = GRUB_DISK_DEVICE_MEMDISK_ID,
75 .iterate = grub_memdisk_iterate,
76 .open = grub_memdisk_open,
77 .close = grub_memdisk_close,
78 .read = grub_memdisk_read,
79 .write = grub_memdisk_write,
80 .next = 0
83 GRUB_MOD_INIT(memdisk)
85 auto int hook (struct grub_module_header *);
86 int hook (struct grub_module_header *header)
88 if (header->type == OBJ_TYPE_MEMDISK)
90 char *memdisk_orig_addr;
91 memdisk_orig_addr = (char *) header + sizeof (struct grub_module_header);
93 grub_dprintf ("memdisk", "Found memdisk image at %p\n", memdisk_orig_addr);
95 memdisk_size = header->size - sizeof (struct grub_module_header);
96 memdisk_addr = grub_malloc (memdisk_size);
98 grub_dprintf ("memdisk", "Copying memdisk image to dynamic memory\n");
99 grub_memmove (memdisk_addr, memdisk_orig_addr, memdisk_size);
101 grub_disk_dev_register (&grub_memdisk_dev);
102 return 1;
105 return 0;
108 grub_module_iterate (hook);
111 GRUB_MOD_FINI(memdisk)
113 if (! memdisk_size)
114 return;
115 grub_free (memdisk_addr);
116 grub_disk_dev_unregister (&grub_memdisk_dev);