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FreeDOS direct loading support. 

* docs/grub.texi (Supported OS): Add FreeDOS.
	* grub-core/Makefile.core.def (freedos): New module.
	* grub-core/lib/i386/relocator.c (grub_relocator16_ebx): New extern
	variable.
	(grub_relocator16_boot): Handle %ebx.
	* grub-core/lib/i386/relocator16.S: Likewise.
	* grub-core/loader/i386/pc/freedos.c: New file.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-05-18 12:15:16 +02:00
parent 05caa461e8 af36812f5c
commit e3a1073fd2
7 changed files with 167 additions and 1 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2011-05-18 Vladimir Serbinenko <phcoder@gmail.com>
FreeDOS direct loading support.
* docs/grub.texi (Supported OS): Add FreeDOS.
* grub-core/Makefile.core.def (freedos): New module.
* grub-core/lib/i386/relocator.c (grub_relocator16_ebx): New extern
variable.
(grub_relocator16_boot): Handle %ebx.
* grub-core/lib/i386/relocator16.S: Likewise.
* grub-core/loader/i386/pc/freedos.c: New file.
2011-05-18 Vladimir Serbinenko <phcoder@gmail.com>
Long Linux command line support.

4
docs/grub.texi
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@ -3942,6 +3942,7 @@ X86 support is summarised in the following table. ``Yes'' means that the kernel
@item @tab BIOS @tab Coreboot
@item BIOS chainloading @tab yes @tab no (1)
@item NTLDR @tab yes @tab no (1)
@item Freedos @tab yes @tab no (1)
@item FreeBSD bootloader @tab yes @tab crashes (1)
@item 32-bit kFreeBSD @tab yes @tab crashes (2,6)
@item 64-bit kFreeBSD @tab yes @tab crashes (2,6)
@ -3966,6 +3967,7 @@ X86 support is summarised in the following table. ``Yes'' means that the kernel
@item @tab Multiboot @tab Qemu
@item BIOS chainloading @tab no (1) @tab no (1)
@item NTLDR @tab no (1) @tab no (1)
@item FreeDOS @tab no (1) @tab no (1)
@item FreeBSD bootloader @tab crashes (1) @tab crashes (1)
@item 32-bit kFreeBSD @tab crashes (6) @tab crashes (6)
@item 64-bit kFreeBSD @tab crashes (6) @tab crashes (6)
@ -3990,6 +3992,7 @@ X86 support is summarised in the following table. ``Yes'' means that the kernel
@item @tab 32-bit EFI @tab 64-bit EFI
@item BIOS chainloading @tab no (1) @tab no (1)
@item NTLDR @tab no (1) @tab no (1)
@item FreeDOS @tab no (1) @tab no (1)
@item FreeBSD bootloader @tab crashes (1) @tab crashes (1)
@item 32-bit kFreeBSD @tab headless @tab headless
@item 64-bit kFreeBSD @tab headless @tab headless
@ -4014,6 +4017,7 @@ X86 support is summarised in the following table. ``Yes'' means that the kernel
@item @tab IEEE1275
@item BIOS chainloading @tab no (1)
@item NTLDR @tab no (1)
@item FreeDOS @tab no (1)
@item FreeBSD bootloader @tab crashes (1)
@item 32-bit kFreeBSD @tab crashes (6)
@item 64-bit kFreeBSD @tab crashes (6)

6
grub-core/Makefile.core.def
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@ -1230,6 +1230,12 @@ module = {
enable = i386_pc;
};
module = {
name = freedos;
i386_pc = loader/i386/pc/freedos.c;
enable = i386_pc;
};
module = {
name = multiboot2;
cppflags = "-DGRUB_USE_MULTIBOOT2";

2
grub-core/lib/i386/relocator.c
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@ -50,6 +50,7 @@ extern grub_uint16_t grub_relocator16_gs;
extern grub_uint16_t grub_relocator16_ss;
extern grub_uint16_t grub_relocator16_sp;
extern grub_uint32_t grub_relocator16_edx;
extern grub_uint32_t grub_relocator16_ebx;
extern grub_uint8_t grub_relocator32_start;
extern grub_uint8_t grub_relocator32_end;
@ -212,6 +213,7 @@ grub_relocator16_boot (struct grub_relocator *rel,
grub_relocator16_ss = state.ss;
grub_relocator16_sp = state.sp;
grub_relocator16_ebx = state.ebx;
grub_relocator16_edx = state.edx;
grub_memmove (get_virtual_current_address (ch), &grub_relocator16_start,

7
grub-core/lib/i386/relocator16.S
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@ -136,7 +136,12 @@ VARIABLE(grub_relocator16_sp)
.byte 0x66, 0xba
VARIABLE(grub_relocator16_edx)
.long 0
/* movw imm32, %ebx. */
.byte 0x66, 0xbb
VARIABLE(grub_relocator16_ebx)
.long 0
/* Cleared direction flag is of no problem with any current
payload and makes this implementation easier. */
cld

136
grub-core/loader/i386/pc/freedos.c Normal file
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@ -0,0 +1,136 @@
/* 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);
}

1
include/grub/i386/relocator.h
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@ -46,6 +46,7 @@ struct grub_relocator16_state
grub_uint16_t ss;
grub_uint16_t sp;
grub_uint16_t ip;
grub_uint32_t ebx;
grub_uint32_t edx;
};