136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/* chainloader.c - boot another boot loader */
|
|
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2002,2004,2007,2009,2010 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 <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <grub/loader.h>
|
|
#include <grub/file.h>
|
|
#include <grub/err.h>
|
|
#include <grub/device.h>
|
|
#include <grub/disk.h>
|
|
#include <grub/misc.h>
|
|
#include <grub/types.h>
|
|
#include <grub/partition.h>
|
|
#include <grub/dl.h>
|
|
#include <grub/command.h>
|
|
#include <grub/machine/biosnum.h>
|
|
#include <grub/i18n.h>
|
|
#include <grub/video.h>
|
|
#include <grub/mm.h>
|
|
#include <grub/cpu/relocator.h>
|
|
|
|
static grub_dl_t my_mod;
|
|
static struct grub_relocator *rel;
|
|
static grub_uint32_t ebx = 0xffffffff;
|
|
|
|
#define GRUB_FREEDOS_SEGMENT 0x60
|
|
#define GRUB_FREEDOS_STACK_SEGMENT 0x1fe0
|
|
#define GRUB_FREEDOS_STACK_POINTER 0x8000
|
|
|
|
static grub_err_t
|
|
grub_freedos_boot (void)
|
|
{
|
|
struct grub_relocator16_state state = {
|
|
.cs = GRUB_FREEDOS_SEGMENT,
|
|
.ip = 0,
|
|
.ds = 0,
|
|
.es = 0,
|
|
.fs = 0,
|
|
.gs = 0,
|
|
.ss = GRUB_FREEDOS_STACK_SEGMENT,
|
|
.sp = GRUB_FREEDOS_STACK_POINTER,
|
|
.ebx = ebx,
|
|
.edx = 0
|
|
};
|
|
grub_video_set_mode ("text", 0, 0);
|
|
|
|
return grub_relocator16_boot (rel, state);
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_freedos_unload (void)
|
|
{
|
|
grub_relocator_unload (rel);
|
|
rel = NULL;
|
|
grub_dl_unref (my_mod);
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cmd_freedos (grub_command_t cmd __attribute__ ((unused)),
|
|
int argc, char *argv[])
|
|
{
|
|
grub_file_t file = 0;
|
|
grub_err_t err;
|
|
void *kernelsys;
|
|
grub_size_t kernelsyssize;
|
|
|
|
if (argc == 0)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no file specified");
|
|
|
|
grub_dl_ref (my_mod);
|
|
|
|
rel = grub_relocator_new ();
|
|
if (!rel)
|
|
goto fail;
|
|
|
|
file = grub_file_open (argv[0]);
|
|
if (! file)
|
|
goto fail;
|
|
|
|
ebx = grub_get_root_biosnumber ();
|
|
|
|
kernelsyssize = grub_file_size (file);
|
|
{
|
|
grub_relocator_chunk_t ch;
|
|
err = grub_relocator_alloc_chunk_addr (rel, &ch, GRUB_FREEDOS_SEGMENT << 4,
|
|
kernelsyssize);
|
|
if (err)
|
|
goto fail;
|
|
kernelsys = get_virtual_current_address (ch);
|
|
}
|
|
|
|
if (grub_file_read (file, kernelsys, kernelsyssize)
|
|
!= (grub_ssize_t) kernelsyssize)
|
|
goto fail;
|
|
|
|
grub_loader_set (grub_freedos_boot, grub_freedos_unload, 1);
|
|
return GRUB_ERR_NONE;
|
|
|
|
fail:
|
|
|
|
if (file)
|
|
grub_file_close (file);
|
|
|
|
grub_freedos_unload ();
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_command_t cmd;
|
|
|
|
GRUB_MOD_INIT(freedos)
|
|
{
|
|
cmd = grub_register_command ("freedos", grub_cmd_freedos,
|
|
0, N_("Load FreeDOS kernel.sys."));
|
|
my_mod = mod;
|
|
}
|
|
|
|
GRUB_MOD_FINI(freedos)
|
|
{
|
|
grub_unregister_command (cmd);
|
|
}
|