139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/* chainloader.c - boot another boot loader */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2004,2007,2009,2010 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/loader.h>
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#include <grub/file.h>
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#include <grub/err.h>
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#include <grub/device.h>
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#include <grub/disk.h>
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#include <grub/misc.h>
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#include <grub/types.h>
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#include <grub/partition.h>
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#include <grub/dl.h>
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#include <grub/command.h>
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#include <grub/machine/biosnum.h>
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#include <grub/i18n.h>
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#include <grub/video.h>
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#include <grub/mm.h>
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#include <grub/cpu/relocator.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static grub_dl_t my_mod;
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static struct grub_relocator *rel;
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static grub_uint32_t ebx = 0xffffffff;
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#define GRUB_FREEDOS_SEGMENT 0x60
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#define GRUB_FREEDOS_STACK_SEGMENT 0x1fe0
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#define GRUB_FREEDOS_STACK_POINTER 0x8000
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static grub_err_t
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grub_freedos_boot (void)
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{
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struct grub_relocator16_state state = {
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.cs = GRUB_FREEDOS_SEGMENT,
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.ip = 0,
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.ds = 0,
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.es = 0,
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.fs = 0,
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.gs = 0,
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.ss = GRUB_FREEDOS_STACK_SEGMENT,
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.sp = GRUB_FREEDOS_STACK_POINTER,
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.ebx = ebx,
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.edx = 0,
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.a20 = 1
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};
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grub_video_set_mode ("text", 0, 0);
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return grub_relocator16_boot (rel, state);
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}
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static grub_err_t
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grub_freedos_unload (void)
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{
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grub_relocator_unload (rel);
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rel = NULL;
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grub_dl_unref (my_mod);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_cmd_freedos (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_file_t file = 0;
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grub_err_t err;
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void *kernelsys;
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grub_size_t kernelsyssize;
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if (argc == 0)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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grub_dl_ref (my_mod);
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rel = grub_relocator_new ();
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if (!rel)
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goto fail;
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file = grub_file_open (argv[0]);
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if (! file)
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goto fail;
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ebx = grub_get_root_biosnumber ();
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kernelsyssize = grub_file_size (file);
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{
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grub_relocator_chunk_t ch;
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err = grub_relocator_alloc_chunk_addr (rel, &ch, GRUB_FREEDOS_SEGMENT << 4,
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kernelsyssize);
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if (err)
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goto fail;
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kernelsys = get_virtual_current_address (ch);
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}
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if (grub_file_read (file, kernelsys, kernelsyssize)
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!= (grub_ssize_t) kernelsyssize)
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goto fail;
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grub_loader_set (grub_freedos_boot, grub_freedos_unload, 1);
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return GRUB_ERR_NONE;
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fail:
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if (file)
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grub_file_close (file);
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grub_freedos_unload ();
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return grub_errno;
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}
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static grub_command_t cmd;
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GRUB_MOD_INIT(freedos)
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{
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cmd = grub_register_command ("freedos", grub_cmd_freedos,
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0, N_("Load FreeDOS kernel.sys."));
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my_mod = mod;
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}
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GRUB_MOD_FINI(freedos)
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{
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grub_unregister_command (cmd);
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}
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