From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:29:51 +0200 Subject: Adding upstream version 2.06. Signed-off-by: Daniel Baumann --- grub-core/disk/memdisk.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) create mode 100644 grub-core/disk/memdisk.c (limited to 'grub-core/disk/memdisk.c') diff --git a/grub-core/disk/memdisk.c b/grub-core/disk/memdisk.c new file mode 100644 index 0000000..613779c --- /dev/null +++ b/grub-core/disk/memdisk.c @@ -0,0 +1,116 @@ +/* memdisk.c - Access embedded memory disk. */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2007,2008 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see . + */ + +#include +#include +#include +#include +#include +#include + +GRUB_MOD_LICENSE ("GPLv3+"); + +static char *memdisk_addr; +static grub_off_t memdisk_size = 0; + +static int +grub_memdisk_iterate (grub_disk_dev_iterate_hook_t hook, void *hook_data, + grub_disk_pull_t pull) +{ + if (pull != GRUB_DISK_PULL_NONE) + return 0; + + return hook ("memdisk", hook_data); +} + +static grub_err_t +grub_memdisk_open (const char *name, grub_disk_t disk) +{ + if (grub_strcmp (name, "memdisk")) + return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a memdisk"); + + disk->total_sectors = memdisk_size / GRUB_DISK_SECTOR_SIZE; + disk->max_agglomerate = GRUB_DISK_MAX_MAX_AGGLOMERATE; + disk->id = 0; + + return GRUB_ERR_NONE; +} + +static void +grub_memdisk_close (grub_disk_t disk __attribute((unused))) +{ +} + +static grub_err_t +grub_memdisk_read (grub_disk_t disk __attribute((unused)), grub_disk_addr_t sector, + grub_size_t size, char *buf) +{ + grub_memcpy (buf, memdisk_addr + (sector << GRUB_DISK_SECTOR_BITS), size << GRUB_DISK_SECTOR_BITS); + return 0; +} + +static grub_err_t +grub_memdisk_write (grub_disk_t disk __attribute((unused)), grub_disk_addr_t sector, + grub_size_t size, const char *buf) +{ + grub_memcpy (memdisk_addr + (sector << GRUB_DISK_SECTOR_BITS), buf, size << GRUB_DISK_SECTOR_BITS); + return 0; +} + +static struct grub_disk_dev grub_memdisk_dev = + { + .name = "memdisk", + .id = GRUB_DISK_DEVICE_MEMDISK_ID, + .disk_iterate = grub_memdisk_iterate, + .disk_open = grub_memdisk_open, + .disk_close = grub_memdisk_close, + .disk_read = grub_memdisk_read, + .disk_write = grub_memdisk_write, + .next = 0 + }; + +GRUB_MOD_INIT(memdisk) +{ + struct grub_module_header *header; + FOR_MODULES (header) + if (header->type == OBJ_TYPE_MEMDISK) + { + char *memdisk_orig_addr; + memdisk_orig_addr = (char *) header + sizeof (struct grub_module_header); + + grub_dprintf ("memdisk", "Found memdisk image at %p\n", memdisk_orig_addr); + + memdisk_size = header->size - sizeof (struct grub_module_header); + memdisk_addr = grub_malloc (memdisk_size); + + grub_dprintf ("memdisk", "Copying memdisk image to dynamic memory\n"); + grub_memmove (memdisk_addr, memdisk_orig_addr, memdisk_size); + + grub_disk_dev_register (&grub_memdisk_dev); + break; + } +} + +GRUB_MOD_FINI(memdisk) +{ + if (! memdisk_size) + return; + grub_free (memdisk_addr); + grub_disk_dev_unregister (&grub_memdisk_dev); +} -- cgit v1.2.3