/
builtins.c
18389 lines (16694 loc) · 495 KB
/
builtins.c
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/* builtins.c - the GRUB builtin commands */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <shared.h>
#include <filesys.h>
#include <term.h>
#include "iamath.h"
#ifdef SUPPORT_SERIAL
# include <serial.h>
# include <terminfo.h>
#endif
#ifdef USE_MD5_PASSWORDS
# include <md5.h>
#endif
#include "freebsd.h"
/* The type of kernel loaded. */
kernel_t kernel_type;
static kernel_t kernel_type_orig;
/* The boot device. */
static int bootdev = 0;
/* The default entry. */
int default_entry = 0;
/* The fallback entry. */
int fallback_entryno;
int fallback_entries[MAX_FALLBACK_ENTRIES];
/* The number of current entry. */
int current_entryno;
#ifdef SUPPORT_GFX
/* graphics file */
char graphics_file[64];
#endif
/* The address for Multiboot command-line buffer. */
static char *mb_cmdline;// = (char *) MB_CMDLINE_BUF;
static char kernel_option_video[64] = {0};/* initialize the first byte to 0 */
/* The password. */
char *password_buf;
static char password_str[128];
/* The password type. */
password_t password_type;
/* The flag for indicating that the user is authoritative. */
int auth = 0;
/* The timeout. */
//int grub_timeout = -1;
/* Whether to show the menu or not. */
int show_menu = 1;
/* Don't display a countdown message for the hidden menu */
int silent_hiddenmenu = 0;
int debug_prog;
int debug_bat = 0;
int debug_ptrace = 0;
//static int debug_break = 0;
//static int debug_pid = 0;
//static int debug_check_memory = 0;
static grub_u8_t msg_password[]="Password: ";
unsigned long pxe_restart_config = 0;
unsigned long configfile_in_menu_init = 0;
/* The first sector of stage2 can be reused as a tmp buffer.
* Do NOT write more than 512 bytes to this buffer!
* The stage2-body, i.e., the pre_stage2, starts at 0x8200!
* Do NOT overwrite the pre_stage2 code at 0x8200!
*/
extern char *mbr /* = (char *)0x8000 */; /* 512-byte buffer for any use. */
extern int dir (char *dirname);
#ifdef SUPPORT_GRAPHICS
extern int outline;
#endif /* SUPPORT_GRAPHICS */
/* Whether the drive map hook is on. */
//static int int13_on_hook = 0;
//static int floppy_not_inserted[4] = {0, 0, 0, 0};
/* The BIOS drive map. */
int drive_map_slot_empty (struct drive_map_slot item);
/* backup of original BIOS floppy-count byte in 0x410 */
extern char floppies_orig;
/* backup of original BIOS harddrive-count byte in 0x475 */
extern char harddrives_orig;
extern unsigned short chain_load_segment;//0x0000;
extern unsigned short chain_load_offset;//0x7c00;
extern unsigned int chain_load_length;//0x200;
extern unsigned short chain_boot_CS;//0x0000;
extern unsigned short chain_boot_IP;//0x7c00;
extern unsigned long chain_ebx;
extern unsigned long chain_ebx_set;
extern unsigned long chain_edx;
extern unsigned long chain_edx_set;
extern unsigned long chain_enable_gateA20;
extern unsigned long chain_bx;
extern unsigned long chain_bx_set;
extern unsigned long chain_cx;
extern unsigned long chain_cx_set;
extern char HMA_start[];
static int chainloader_load_segment = 0;
static int chainloader_load_segment_orig = 0;
static int chainloader_load_offset = 0;
static int chainloader_load_offset_orig = 0;
static int chainloader_load_length = 0;
static int chainloader_load_length_orig = 0;
static int chainloader_skip_length = 0;
static int chainloader_skip_length_orig = 0;
static int chainloader_boot_CS = 0;
static int chainloader_boot_CS_orig = 0;
static int chainloader_boot_IP = 0;
static int chainloader_boot_IP_orig = 0;
static long chainloader_ebx = 0;
static long chainloader_ebx_orig = 0;
static int chainloader_ebx_set = 0;
static int chainloader_ebx_set_orig = 0;
static long chainloader_edx = 0;
static long chainloader_edx_orig = 0;
static int chainloader_edx_set = 0;
static int chainloader_edx_set_orig = 0;
static long chainloader_bx = 0;
static long chainloader_bx_orig = 0;
static int chainloader_bx_set = 0;
static int chainloader_bx_set_orig = 0;
static long chainloader_cx = 0;
static long chainloader_cx_orig = 0;
static int chainloader_cx_set = 0;
static int chainloader_cx_set_orig = 0;
static int chainloader_disable_A20 = 0;
static int chainloader_disable_A20_orig = 0;
static int is_sdi = 0;
static int is_sdi_orig = 0;
static int is_raw = 0;
static int is_raw_orig = 0;
static int is_isolinux = 0;
static int is_isolinux_orig = 0;
static int is_grldr = 0;
static int is_grldr_orig = 0;
static int is_io = 0;
static int is_io_orig = 0;
static char chainloader_file[256];
static char chainloader_file_orig[256];
static const char *warning_defaultfile = "# WARNING: If you want to edit this file directly, do not remove any line";
static struct vbe_controller *controller = (struct vbe_controller *)0x8000;//use 512 bytes
static struct vbe_mode *mode = (struct vbe_mode *)0x700;//use 255 bytes
void set_full_path(char *dest, char *arg, grub_u32_t max_len);
void set_full_path(char *dest, char *arg, grub_u32_t max_len)
{
int len;
if (*arg != '/' && !(*arg == '(' && arg[1] == ')'))
{
grub_memmove (dest, arg, max_len);
return;
}
print_root_device(dest,0);
len = strlen(dest);
if (*arg == '/') grub_sprintf(dest + len,"%s%s",saved_dir,arg);
else grub_sprintf(dest + len,"%s",arg + 2);
}
int
drive_map_slot_empty (struct drive_map_slot item)
{
unsigned long *array = (unsigned long *)&item;
unsigned long n = sizeof (struct drive_map_slot) / sizeof (unsigned long);
while (n)
{
if (*array)
return 0;
array++;
n--;
}
return 1;
//if (*(unsigned long *)(&(item.from_drive))) return 0;
//if (item.start_sector) return 0;
//if (item.sector_count) return 0;
//return 1;
}
static int
drive_map_slot_equal (struct drive_map_slot a, struct drive_map_slot b)
{
//return ! grub_memcmp ((void *)&(a.from_drive), (void *)&(b.from_drive), sizeof(struct drive_map_slot));
return ! grub_memcmp ((void *)&a, (void *)&b, sizeof(struct drive_map_slot));
//if (*(unsigned long *)(&(a.from_drive)) != *(unsigned long *)(&(b.from_drive))) return 0;
//if (a.start_sector != b.start_sector) return 0;
//if (a.sector_count != b.sector_count) return 0;
//return 1;
}
int map_func (char *arg, int flags);
int disable_map_info = 0;
/* Prototypes for allowing straightfoward calling of builtins functions
inside other functions. */
static int configfile_func (char *arg, int flags);
void lba_to_chs (unsigned long lba, unsigned long *cl, unsigned long *ch, unsigned long *dh);
//static char *set_device (char *device);
//static int real_open_partition (int flags);
//static int open_partition (void);
int command_func (char *arg, int flags);
int commandline_func (char *arg, int flags);
int errnum_func (char *arg, int flags);
int checkrange_func (char *arg, int flags);
/* Check a password for correctness. Returns 0 if password was
correct, and a value != 0 for error, similarly to strcmp. */
int
check_password (char* expected, password_t type)
{
/* Do password check! */
char entered[32];
/* Wipe out any previously entered password */
// entered[0] = 0;
memset(entered,0,sizeof(entered));
get_cmdline_str.prompt = msg_password;
get_cmdline_str.maxlen = sizeof (entered) - 1;
get_cmdline_str.echo_char = '*';
get_cmdline_str.readline = 0;
get_cmdline_str.cmdline = (unsigned char*)entered;
get_cmdline ();
switch (type)
{
case PASSWORD_PLAIN:
return strcmp (entered, expected);
#ifdef USE_MD5_PASSWORDS
case PASSWORD_MD5:
return check_md5_password (entered, expected);
#endif
default:
/* unsupported password type: be secure */
return 1;
}
}
/* Print which sector is read when loading a file. */
static void
disk_read_print_func (unsigned long long sector, unsigned long offset, unsigned long long length)
{
grub_printf ("[0x%lx,0x%x,0x%lx]", sector, offset, length);
}
extern int rawread_ignore_memmove_overflow; /* defined in disk_io.c */
long query_block_entries;
//static unsigned long long map_start_sector[DRIVE_MAP_FRAGMENT];
//static unsigned long long map_num_sectors[DRIVE_MAP_FRAGMENT];
unsigned long long* map_start_sector=0;
unsigned long long* map_num_sectors;
static unsigned long long blklst_start_sector;
static unsigned long long blklst_num_sectors;
static unsigned long blklst_num_entries;
static unsigned long blklst_last_length;
static void disk_read_blocklist_func (unsigned long long sector, unsigned long offset, unsigned long long length);
/* Collect contiguous blocks into one entry as many as possible,
and print the blocklist notation on the screen. */
static void
disk_read_blocklist_func (unsigned long long sector, unsigned long offset, unsigned long long length)
{
unsigned long sectorsize = buf_geom.sector_size;
unsigned char sector_bit = (sectorsize == 2048 ? 11:9);
#ifdef FSYS_INITRD
if (fsys_table[fsys_type].mount_func == initrdfs_mount)
{
if (query_block_entries >= 0)
printf("(md,0x%lx,0x%lx)+1",(sector << SECTOR_BITS) + offset,length);
return;
}
#endif
if (blklst_num_sectors > 0)
{
if (blklst_start_sector + blklst_num_sectors == sector
&& offset == 0 && blklst_last_length == 0)
{
blklst_num_sectors += (length + (sectorsize - 1)) >> sector_bit;
blklst_last_length = (length - (sectorsize - offset))&(sectorsize - 1);
return;
}
else
{
if (query_block_entries >= 0)
{
if (blklst_last_length == 0)
grub_printf ("%s0x%lx+0x%lx", (blklst_num_entries ? "," : ""),
(unsigned long long)(blklst_start_sector/* - part_start*/), blklst_num_sectors);
else if (blklst_num_sectors > 1)
grub_printf ("%s0x%lx+0x%lx,0x%lx[0-0x%x]", (blklst_num_entries ? "," : ""),
(unsigned long long)(blklst_start_sector/* - part_start*/), (blklst_num_sectors-1),
(unsigned long long)(blklst_start_sector + blklst_num_sectors-1/* - part_start*/),
blklst_last_length);
else
grub_printf ("%s0x%lx[0-0x%x]", (blklst_num_entries ? "," : ""),
(unsigned long long)(blklst_start_sector/* - part_start*/), blklst_last_length);
}
else if (blklst_last_length == 0 && blklst_num_entries < DRIVE_MAP_FRAGMENT)
{
map_start_sector[blklst_num_entries] = blklst_start_sector;
map_num_sectors[blklst_num_entries] = blklst_num_sectors;
}
blklst_num_entries++;
blklst_num_sectors = 0;
}
}
if (offset > 0)
{
if (query_block_entries >= 0)
grub_printf("%s0x%lx[0x%x-0x%x]", (blklst_num_entries ? "," : ""),
(unsigned long long)(sector/* - part_start*/), offset, (offset + length));
blklst_num_entries++;
}
else
{
blklst_start_sector = sector;
blklst_num_sectors = (length + sectorsize - 1) >> sector_bit;
blklst_last_length = (length - (sectorsize - offset))&(sectorsize - 1);
}
}
/* blocklist */
static int
blocklist_func (char *arg, int flags)
{
char *dummy = NULL;
unsigned long long err;
#ifndef NO_DECOMPRESSION
int no_decompression_bak = no_decompression;
#endif
errnum = 0;
blklst_start_sector = 0;
blklst_num_sectors = 0;
blklst_num_entries = 0;
blklst_last_length = 0;
if (!map_start_sector)
{
map_start_sector = grub_zalloc(DRIVE_MAP_FRAGMENT);
map_num_sectors = grub_zalloc(DRIVE_MAP_FRAGMENT);
}
else
{
grub_memset (map_start_sector, 0, DRIVE_MAP_FRAGMENT);
grub_memset (map_num_sectors, 0, DRIVE_MAP_FRAGMENT);
}
#if 0
int i;
for (i = 0; i < DRIVE_MAP_FRAGMENT; i++)
{
map_start_sector[i] =0;
map_num_sectors[i] =0;
}
#endif
/* Open the file. */
if (! grub_open (arg))
goto fail_open;
#ifdef FSYS_INITRD
if (fsys_table[fsys_type].mount_func == initrdfs_mount)
{
disk_read_hook = disk_read_blocklist_func;
err = grub_read ((unsigned long long)(unsigned int)dummy,-1ULL, GRUB_LISTBLK);
disk_read_hook = 0;
goto fail_read;
}
#endif
#ifndef NO_DECOMPRESSION
if (compressed_file)
{
if (query_block_entries < 0)
{
/* compressed files are not considered contiguous. */
// query_block_entries = 3;
goto fail_read;
}
grub_close ();
no_decompression = 1;
if (! grub_open (arg))
goto fail_open;
}
#endif /* NO_DECOMPRESSION */
/* Print the device name. */
if (query_block_entries >= 0) print_root_device (NULL,1 | 0x100);
rawread_ignore_memmove_overflow = 1;
/* Read in the whole file to DUMMY. */
disk_read_hook = disk_read_blocklist_func;
// err = grub_read ((unsigned long long)(unsigned int)dummy, (query_block_entries < 0 ? buf_geom.sector_size : -1ULL), 0xedde0d90);
err = grub_read ((unsigned long long)(unsigned int)dummy, -1ULL, GRUB_LISTBLK);
disk_read_hook = 0;
rawread_ignore_memmove_overflow = 0;
if (! err)
goto fail_read;
/* The last entry may not be printed yet. Don't check if it is a
* full sector, since it doesn't matter if we read too much. */
if (blklst_num_sectors > 0)
{
if (query_block_entries >= 0)
grub_printf ("%s0x%lx+0x%lx", (blklst_num_entries ? "," : ""),
(unsigned long long)(blklst_start_sector/* - part_start*/), blklst_num_sectors);
else if (blklst_num_entries < DRIVE_MAP_FRAGMENT)
{
map_start_sector[blklst_num_entries] = blklst_start_sector;
map_num_sectors[blklst_num_entries] = blklst_num_sectors;
}
blklst_num_entries++;
}
if (query_block_entries >= 0)
grub_putchar ('\n', 255);
else
query_block_entries = blklst_num_entries;
#if 0
else
{
query_block_entries = 1;
map_start_sector = start_sector;
map_num_sectors = num_sectors;
}
if (query_block_entries < 0)
{
map_start_sector = blklst_start_sector;
blklst_start_sector = 0;
blklst_num_sectors = 0;
blklst_num_entries = 0;
blklst_last_length = 0;
rawread_ignore_memmove_overflow = 1;
/* read in the last sector to DUMMY */
filepos = filemax ? (filemax - 1) & (-(unsigned long long)buf_geom.sector_size) : filemax;
disk_read_hook = disk_read_blocklist_func;
err = grub_read ((unsigned long long)(unsigned int)dummy, -1ULL, 0xedde0d90);
disk_read_hook = 0;
rawread_ignore_memmove_overflow = 0;
if (! err)
goto fail_read;
map_num_sectors = blklst_start_sector - map_start_sector + 1;
query_block_entries = filemax ?
map_num_sectors - ((filemax - 1) >> log2_tmp (buf_geom.sector_size)/*>> SECTOR_BITS*/) : 2;
}
#endif
fail_read:
grub_close ();
fail_open:
#ifndef NO_DECOMPRESSION
no_decompression = no_decompression_bak;
#endif
if (query_block_entries < 0)
query_block_entries = 0;
return ! errnum;
}
static struct builtin builtin_blocklist =
{
"blocklist",
blocklist_func,
BUILTIN_MENU | BUILTIN_CMDLINE | BUILTIN_SCRIPT | BUILTIN_HELP_LIST | BUILTIN_IFTITLE | BUILTIN_NO_DECOMPRESSION,
"blocklist FILE",
"Print the blocklist notation of the file FILE."
};
/* WinME support by bean. Thanks! */
// The following routines are used to decompress IO.SYS from WinME
static int ibuf_pos;
static char *ibuf_ptr,*obuf_ptr;
static unsigned short ibuf_tab[16];
static void ibuf_init(char* buf);
static unsigned short ibuf_read(int nbits);
static int expand_block(int nsec);
static long expand_file(char* src,char* dst);
static void ibuf_init(char* buf)
{
int i;
ibuf_ptr=buf;
ibuf_pos=0;
// ibuf_tab[i]=(1<<(i+1))-1
ibuf_tab[0]=1;
for (i=1;i<16;i++)
ibuf_tab[i]=ibuf_tab[i-1]*2+1;
}
static unsigned short ibuf_read(int nbits)
{
unsigned short res;
res=(unsigned short)((*((unsigned long*)ibuf_ptr)>>ibuf_pos) & ibuf_tab[nbits-1]);
ibuf_pos+=nbits;
if (ibuf_pos>=8)
{
ibuf_ptr+=(ibuf_pos>>3);
ibuf_pos&=7;
}
return res;
}
#define obuf_init(buf) obuf_ptr=buf
#define obuf_putc(ch) *(obuf_ptr++)=ch
#define obuf_copy(ofs,len) do { for (;len>0;obuf_ptr++,len--) *(obuf_ptr)=*(obuf_ptr-ofs); } while (0)
// Don't use memcpy, otherwise we could be screwed !
static int expand_block(int nsec)
{
while (nsec>0)
{
int cnt;
cnt=0x200;
while (1)
{
int flg,ofs,bts,bse,del,len;
flg=ibuf_read(2);
if (flg==0) ofs=ibuf_read(6); else
if (flg==3)
{
if (ibuf_read(1))
{
ofs=ibuf_read(12)+0x140;
if (ofs==0x113F)
break;
}
else
ofs=ibuf_read(8)+0x40;
} else
{
char ch;
cnt--;
if (cnt<0)
{
grub_putstr("Data corrupted");
return 1;
}
ch=ibuf_read(7);
if (flg & 1)
ch|=0x80;
obuf_putc(ch);
continue;
}
if (ofs==0)
{
grub_putstr("Data corrupted");
return 1;
}
bse=2;
del=0;
for (bts=0;bts<9;bts++)
{
if (ibuf_read(1))
break;
bse+=del+1;
del=del*2+1;
}
if (bts==9)
{
grub_putstr("Data corrupted");
return 1;
}
len=(bts)?bse+ibuf_read(bts):bse;
if ((cnt=cnt-len)<0)
{
grub_putstr("Data corrupted");
return 1;
}
obuf_copy(ofs,len);
}
nsec--;
if ((cnt) && (nsec))
{
grub_putstr("Data corrupted");
return 1;
}
}
return 0;
}
static long expand_file(char* src,char* dst)
{
ibuf_init(src);
obuf_init(dst);
if (ibuf_read(16)!=0x4D43)
{
grub_putstr("First CM signature not found");
return -1;
}
while (1)
{
unsigned short flg,len;
flg=ibuf_read(8);
len=ibuf_read(16);
if (len==0)
{
int n;
n=(ibuf_ptr-src) & 0xF;
if ((n) || (ibuf_pos))
{
ibuf_ptr+=16-n;
ibuf_pos=0;
}
if (ibuf_read(16)!=0x4D43)
{
grub_putstr("Second CM signature not found");
return -1;
}
return obuf_ptr-dst;
}
if (flg==0)
{
memcpy(obuf_ptr,ibuf_ptr,len);
ibuf_ptr+=len;
obuf_ptr+=len;
}
else
{
char* save_ptr;
unsigned short sec;
sec=(ibuf_read(16)+511)>>9;
save_ptr=ibuf_ptr;
if (ibuf_read(16)!=0x5344)
{
grub_putstr("0x5344 signature not found");
return -1;
}
ibuf_read(16);
if (expand_block(sec))
return -1;
ibuf_ptr=save_ptr+len;
ibuf_pos=0;
}
}
}
/* boot */
static int
boot_func (char *arg, int flags)
{
int old_cursor, old_errnum;
struct term_entry *prev_term = current_term;
/* if our terminal needed initialization, we should shut it down
* before booting the kernel, but we want to save what it was so
* we can come back if needed */
if (current_term->shutdown)
{
(*current_term->shutdown)();
current_term = term_table; /* assumption: console is first */
}
#ifdef FSYS_PXE
if (kernel_type!=KERNEL_TYPE_CHAINLOADER)
pxe_unload();
#endif
old_cursor = setcursor (1);
errnum = 0;
//errorcheck = 1;
/* clear keyboard buffer before boot */
while (console_checkkey () != -1) console_getkey ();
/* if arg == -1 or --int18 boot via INT 18*/
if (*(unsigned short*)arg == 0x312d || memcmp(arg,"--int18",7) == 0)
{
grub_printf("Local boot via INT 18...\n");
boot_int18();
return 0;
};
switch (kernel_type)
{
case KERNEL_TYPE_FREEBSD:
case KERNEL_TYPE_NETBSD:
/* *BSD */
bsd_boot (kernel_type, /*0*/bootdev, (char *) mbi.cmdline);
break;
case KERNEL_TYPE_LINUX:
/* Linux */
map_func ("(0x22) (0x22)", flags); /* delete mapping for INITRD_DRIVE */
map_func ("--rehook", flags);
linux_boot ();
break;
case KERNEL_TYPE_BIG_LINUX:
/* Big Linux */
{
unsigned int p;
/* check grub.exe */
for (p = (unsigned int)linux_bzimage_tmp_addr; p < (unsigned int)linux_bzimage_tmp_addr + 0x8000; p += 0x200)
{
if (((*(long long *)(void *)p & 0xFFFF00FFFFFFFFFFLL) == 0x02030000008270EALL) &&
((*(long long *)(void *)(p + 0x12) & 0xFFFFFFFFFFLL) == 0x0037392E30LL))
{
#ifdef FSYS_PXE
if (pxe_entry == 0)
*(char *)(void *)(p + 5) |= 0x01; // disable pxe
#endif
if (*(long *)(void *)(p + 0x80) == 0xFFFFFFFF)//boot_drive
{
*(long *)(void *)(p + 0x80) = saved_drive;
*(long *)(void *)(p + 0x08) = saved_partition;
}
break;
}
}
}
map_func ("(0x22) (0x22)", flags); /* delete mapping for INITRD_DRIVE */
map_func ("--rehook", flags);
big_linux_boot ();
break;
case KERNEL_TYPE_CHAINLOADER:
/* Chainloader */
/* set boot drive to the root device.
* the boot drive should be either (fd0) or (hd0) for normal
* MS-style boot sectors. the BIOS only passes (fd0) or (hd0)
* to DL, because these two are the only devices that can be
* booted by BIOS.
*
* You should set boot drive using the rootnoverify command just
* before the boot command.
*/
boot_drive = saved_drive;
/* extended chainloader */
if (chainloader_load_length > 512 || chainloader_boot_CS > 0 ||
chainloader_skip_length ||
chainloader_ebx_set ||
chainloader_edx_set ||
chainloader_bx_set ||
chainloader_cx_set ||
is_sdi || is_raw || //chainloader_disable_A20 ||
(chainloader_boot_IP >= 0 && chainloader_boot_IP != 0x7c00) ||
(((chainloader_load_segment >= 0)? chainloader_load_segment : 0) << 4) +
((chainloader_load_offset >= 0)? chainloader_load_offset : 0x7c00) != 0x7c00
)
{
unsigned long read_length;
/* load high */
if (chainloader_load_segment == -1)
chainloader_load_segment = 0;
if (chainloader_load_offset == -1)
{
if (chainloader_load_segment)
chainloader_load_offset = 0;
else
chainloader_load_offset = 0x7c00;
}
if (chainloader_boot_CS == -1)
chainloader_boot_CS = chainloader_load_segment;
if (chainloader_boot_IP == -1)
chainloader_boot_IP = chainloader_load_offset;
/* Open the file. */
if (! grub_open (chainloader_file))
{
kernel_type = KERNEL_TYPE_NONE;
return 0;
}
if (is_sdi)
{
unsigned long long bytes_needed = filemax;
unsigned long long base = 0;
if (mbi.flags & MB_INFO_MEM_MAP)
{
struct AddrRangeDesc *map = (struct AddrRangeDesc *) saved_mmap_addr;
unsigned long end_addr = saved_mmap_addr + saved_mmap_length;
for (; end_addr > (unsigned long) map; map = (struct AddrRangeDesc *) (((int) map) + 4 + map->size))
{
unsigned long long top_end;
if (map->Type != MB_ARD_MEMORY)
continue;
top_end = map->BaseAddr + map->Length;
if (top_end > 0x100000000ULL)
top_end = 0x100000000ULL;
#define MIN_EMU_BASE 0x200000ULL
if (map->Length >= bytes_needed
&& (base = (top_end - bytes_needed) & 0xfffff000) >= MIN_EMU_BASE /* page align */
&& map->Length >= top_end - base)
break; /* success */
base = 0;
}
}
else
grub_printf ("Address Map BIOS Interface is not activated.\n");
if (base < MIN_EMU_BASE)
{
grub_close ();
return ! (errnum = ERR_WONT_FIT);
}
#undef MIN_EMU_BASE
//filepos = 0;
if (grub_read (base, -1ULL, 0xedde0d90) != filemax)
{
grub_close ();
if (errnum == ERR_NONE)
errnum = ERR_READ;
return 0;
}
grub_close ();
unset_int13_handler (0);
#define BootCodeOffsetLow (*(unsigned long *)((int)base + 0x10))
#define BootCodeSizeLow (*(unsigned long *)((int)base + 0x18))
read_length = BootCodeSizeLow;
if (read_length > 0x90000)
read_length = 0x90000;
grub_memmove((char *)0x200000, (char *)((unsigned int)base + BootCodeOffsetLow), read_length);
#undef BootCodeOffsetLow
#undef BootCodeSizeLow
if (! chainloader_edx_set)
{
chainloader_edx = (unsigned int)base | 0x41;
chainloader_edx_set = 1;
}
}else{
/* Read the first 640K */
read_length = filemax - chainloader_skip_length;
filepos = ((*(unsigned short *)0x413)<<10) - (chainloader_load_segment<<4) - chainloader_load_offset;
if (read_length > filepos)
read_length = filepos;
filepos = chainloader_skip_length;
/* read the new loader to physical address 2MB, overwriting
* the backup area of DOS memory.
*/
if (grub_read ((unsigned long long) 0x200000, read_length, 0xedde0d90) != read_length)
{
grub_close ();
kernel_type = KERNEL_TYPE_NONE;
if (errnum == ERR_NONE)
errnum = ERR_EXEC_FORMAT;
break;
}
grub_close ();
#ifdef FSYS_PXE
pxe_unload();
#endif
if (is_io)
{
/* WinMe support by bean. Thanks! */
// Not a very neat way to test WinME, works anyway
if ((*(unsigned short*)0x200000==0x4D43) &&
// ((*(char*)0x110002==0) || (*(unsigned short*)0x110000==0x4D43)) &&
(chainloader_skip_length==0x800))
{
unsigned long len;
len=(unsigned long)expand_file((char*)0x200000,(char*)0x2A0000);
if (len==0xffffffff || len==0)
{
kernel_type = KERNEL_TYPE_NONE;
errnum = ERR_EXEC_FORMAT;
break;
}
grub_memmove((char*)0x200000,(char*)0x2A0000,len);
chainloader_load_length=read_length=len;
}
/* import from WEE, to prevent MS from wiping int32-3F. */
/* search these 12 bytes ... */
/* 83 C7 08 add di,08 */
/* B9 0E 00 mov cx,0E */
/* AB stosw */
/* 83 C7 02 add di,02 */
/* E2 FA loop (-6) */
/* ... replace with NOPs */
{
unsigned long p = 0x200000;
unsigned long q = 0x200000 - 16 + read_length;
while (p < q)
{
if ((*(long *)p == 0xB908C783) &&
(*(long long*)(p+4)==0xFAE202C783AB000ELL))
{
((long *)p)[2]=((long *)p)[1]=
*(long *)p = 0x90909090;
p += 12;
continue; /* would occur 3 times */
}
p++;
}
}
}
/* create boot info table for isolinux */
if (is_isolinux)
{
int p;
query_block_entries = -1; /* query block list only */
// query_block_entries = 4;
blocklist_func (chainloader_file, flags);
if (errnum)
break;
// if (query_block_entries != 1)
if (query_block_entries <= 0 || query_block_entries > DRIVE_MAP_FRAGMENT)
{
errnum = ERR_MANY_FRAGMENTS;
break;
}
*(unsigned long*)0x20000C = map_start_sector[0];
*(unsigned long*)0x200010 = chainloader_load_length;
old_errnum = 0; /* init to calculate the checksum */
*(unsigned long*)(0x200000 + chainloader_load_length) = 0;
for (p = 0; p < (chainloader_load_length - 0x40 + 3) / 4; p++)
{
old_errnum += *(long *)(0x200040 + (p << 2));
}
*(unsigned long*)0x200014 = old_errnum; /* checksum */
}
#ifdef FSYS_PXE
if (is_grldr && pxe_entry == 0)
{
*(unsigned char*)0x202005 |= 0x01; /* disable pxe */
}
#endif
/* Turn off A20 here if --disable-a20 was specified.
* Note: we won't have access to the odd megas of the memory
* when A20 is off.
*/
if (chainloader_disable_A20)
{
if (! gateA20 (0))
{
/* to asure A20 is on when we return to grub. */
gateA20 (1); /* turn on A20 in case it is off */