55a581dc06
* conf/i386-pc.rmk (kernel_img_HEADERS): Add `machine/kernel.h'.
(pkglib_MODULES): Add `memdisk.mod'.
(memdisk_mod_SOURCES): New variable.
(memdisk_mod_CFLAGS): Likewise.
(memdisk_mod_LDFLAGS): Likewise.
* disk/memdisk.c: New file.
* include/grub/disk.h (grub_disk_dev_id): Add
`GRUB_DISK_DEVICE_MEMDISK_ID'.
* include/grub/i386/pc/kernel.h
(GRUB_KERNEL_MACHINE_MEMDISK_IMAGE_SIZE): New macro.
(GRUB_KERNEL_MACHINE_PREFIX): Increment by 4.
(grub_kernel_image_size): New variable declaration.
(grub_total_module_size): Likewise.
(grub_memdisk_image_size): Likewise.
* include/grub/i386/pc/memory.h
(GRUB_MEMORY_MACHINE_DECOMPRESSION_ADDR): New macro.
* include/grub/kernel.h: Include `<grub/symbol.h>'.
(grub_arch_memdisk_addr): New variable declaration.
(grub_arch_memdisk_size): Likewise.
* kern/i386/pc/init.c (grub_arch_memdisk_addr): New function.
(grub_arch_memdisk_size): Likewise.
* kern/i386/pc/startup.S (grub_memdisk_image_size): New variable.
(codestart): Replace hardcoded `0x100000' with
`GRUB_MEMORY_MACHINE_DECOMPRESSION_ADDR' macro.
* util/i386/pc/grub-mkimage.c: Include `<grub/misc.h>'.
(generate_image): Add `memdisk_path' parameter. When `memdisk_path' is
not NULL, append the contents of the file it refers to, at the end of
the compressed kernel image. Initialize `grub_memdisk_image_size'
variable (at `GRUB_KERNEL_MACHINE_MEMDISK_IMAGE_SIZE' offset).
(options): Add "memdisk"|'m' option.
(main): Parse --memdisk|-m option, and pass user-provided path as
parameter to generate_image().
94 lines
2.5 KiB
C
94 lines
2.5 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 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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static grub_addr_t memdisk_addr;
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static int
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grub_memdisk_iterate (int (*hook) (const char *name))
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{
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return hook ("memdisk");
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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 = grub_arch_memdisk_size () / GRUB_DISK_SECTOR_SIZE;
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disk->id = (int) 'mdsk';
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disk->has_partitions = 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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if (! grub_arch_memdisk_size ())
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return;
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memdisk_addr = grub_arch_memdisk_addr ();
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grub_disk_dev_register (&grub_memdisk_dev);
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}
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GRUB_MOD_FINI(memdisk)
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{
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if (! grub_arch_memdisk_size ())
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return;
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grub_disk_dev_unregister (&grub_memdisk_dev);
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}
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