116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/* memdisk.c - Access embedded memory disk. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007,2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/disk.h>
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#include <grub/dl.h>
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#include <grub/kernel.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/types.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static char *memdisk_addr;
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static grub_off_t memdisk_size = 0;
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static int
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grub_memdisk_iterate (grub_disk_dev_iterate_hook_t hook, void *hook_data,
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grub_disk_pull_t pull)
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{
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if (pull != GRUB_DISK_PULL_NONE)
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return 0;
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return hook ("memdisk", hook_data);
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}
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static grub_err_t
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grub_memdisk_open (const char *name, grub_disk_t disk)
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{
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if (grub_strcmp (name, "memdisk"))
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a memdisk");
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disk->total_sectors = memdisk_size / GRUB_DISK_SECTOR_SIZE;
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disk->max_agglomerate = GRUB_DISK_MAX_MAX_AGGLOMERATE;
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disk->id = 0;
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return GRUB_ERR_NONE;
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}
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static void
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grub_memdisk_close (grub_disk_t disk __attribute((unused)))
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{
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}
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static grub_err_t
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grub_memdisk_read (grub_disk_t disk __attribute((unused)), grub_disk_addr_t sector,
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grub_size_t size, char *buf)
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{
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grub_memcpy (buf, memdisk_addr + (sector << GRUB_DISK_SECTOR_BITS), size << GRUB_DISK_SECTOR_BITS);
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return 0;
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}
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static grub_err_t
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grub_memdisk_write (grub_disk_t disk __attribute((unused)), grub_disk_addr_t sector,
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grub_size_t size, const char *buf)
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{
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grub_memcpy (memdisk_addr + (sector << GRUB_DISK_SECTOR_BITS), buf, size << GRUB_DISK_SECTOR_BITS);
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return 0;
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}
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static struct grub_disk_dev grub_memdisk_dev =
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{
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.name = "memdisk",
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.id = GRUB_DISK_DEVICE_MEMDISK_ID,
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.iterate = grub_memdisk_iterate,
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.open = grub_memdisk_open,
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.close = grub_memdisk_close,
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.read = grub_memdisk_read,
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.write = grub_memdisk_write,
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.next = 0
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};
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GRUB_MOD_INIT(memdisk)
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{
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struct grub_module_header *header;
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FOR_MODULES (header)
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if (header->type == OBJ_TYPE_MEMDISK)
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{
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char *memdisk_orig_addr;
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memdisk_orig_addr = (char *) header + sizeof (struct grub_module_header);
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grub_dprintf ("memdisk", "Found memdisk image at %p\n", memdisk_orig_addr);
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memdisk_size = header->size - sizeof (struct grub_module_header);
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memdisk_addr = grub_malloc (memdisk_size);
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grub_dprintf ("memdisk", "Copying memdisk image to dynamic memory\n");
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grub_memmove (memdisk_addr, memdisk_orig_addr, memdisk_size);
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grub_disk_dev_register (&grub_memdisk_dev);
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break;
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}
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}
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GRUB_MOD_FINI(memdisk)
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{
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if (! memdisk_size)
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return;
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grub_free (memdisk_addr);
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grub_disk_dev_unregister (&grub_memdisk_dev);
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}
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