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builtins.c
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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"
#include <iso9660.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 int pxe_restart_config = 0;
unsigned int 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 */
/* The BIOS drive map. */
int drive_map_slot_empty (struct drive_map_slot item);
static int chainloader_load_segment = 0;
static int chainloader_load_offset = 0;
static int chainloader_skip_length = 0;
static int chainloader_ebx = 0;
static int chainloader_ebx_set = 0;
static int chainloader_edx = 0;
static int chainloader_edx_set = 0;
static int is_io = 0;
//使用于configfile_func, command_open, GetParentUtf8Name
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";
int probe_bpb (struct master_and_dos_boot_sector *BS);
int probe_mbr (struct master_and_dos_boot_sector *BS, unsigned int start_sector1, unsigned int sector_count1, unsigned int part_start1);
int parse_string (char *arg);
int envi_cmd(const char *var,char * const env,int flags);
//extern int count_lines;
//extern int use_pager;
#if defined(__i386__)
char *convert_to_ascii (char *buf, int c, ...);
#else
char *convert_to_ascii (char *buf, int c, unsigned long long lo);
#endif
unsigned int prog_pid;
extern int errorcheck;
unsigned int next_partition_drive;
unsigned int next_partition_dest;
unsigned int *next_partition_partition;
unsigned int *next_partition_type;
unsigned long long *next_partition_start;
unsigned long long *next_partition_len;
unsigned long long *next_partition_offset;
unsigned int *next_partition_entry;
unsigned int *next_partition_ext_offset;
char *next_partition_buf;
unsigned char partition_signature[16]; //分区签名
unsigned char partition_activity_flag; //分区活动标志
int fsys_type;
extern unsigned int fats_type;
extern unsigned int iso_type;
int get_mmap_entry (struct mmar_desc *desc, int cont);
int no_install_vdisk = 0; //0/1=安装虚拟磁盘/不安装虚拟磁盘
static int ls_func (char *arg, int flags);
static char *GRUB_MOD_ADDR=0;
static char* mod_end;
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);
int
drive_map_slot_empty (struct drive_map_slot item)//判断驱动器映像插槽是否为空 为空,返回1
{
grub_size_t *array = (grub_size_t *)&item;
grub_size_t n = sizeof (struct drive_map_slot) / sizeof (grub_size_t);
while (n)
{
if (*array)
return 0;
array++;
n--;
}
return 1;
}
int disable_map_info = 0;
/* Prototypes for allowing straightfoward calling of builtins functions
inside other functions. */
static int configfile_func (char *arg, int flags);
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);
int
check_password (char* expected, password_t type)
{
/* Do password check! */
char entered[32];
/* Wipe out any previously entered password */
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 int offset, unsigned long long length);
static void
disk_read_print_func (unsigned long long sector, unsigned int offset, unsigned long long length)
{
grub_printf ("[%ld,%d,%ld]", sector, offset, length);
}
extern int rawread_ignore_memmove_overflow; /* defined in disk_io.c */
int query_block_entries;
static unsigned long long map_start_sector[DRIVE_MAP_FRAGMENT];
static unsigned long long map_num_sectors[DRIVE_MAP_FRAGMENT];
static unsigned long long blklst_start_sector;
static unsigned long long blklst_num_sectors;
static unsigned int blklst_num_entries;
static unsigned int blklst_last_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 int offset, unsigned long long length);
static void
disk_read_blocklist_func (unsigned long long sector, unsigned int offset, unsigned long long length)
{
unsigned int sectorsize = buf_geom.sector_size;
// unsigned char sector_bit = (sectorsize == 2048 ? 11 : sectorsize == 4096 ? 12 : 9);
unsigned char sector_bit = buf_geom.log2_sector_size;
#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 ("%s%lx+%lx", (blklst_num_entries ? "," : ""),
(unsigned long long)(blklst_start_sector/* - part_start*/), blklst_num_sectors);
else if (blklst_num_sectors > 1)
grub_printf ("%s%lx+%lx,%lx[0-%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 ("%s%lx[0-%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("%s%lx[%x-%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);
static int
blocklist_func (char *arg, int flags)
{
char *dummy = NULL;
int i;
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;
for (i = 0; i < DRIVE_MAP_FRAGMENT; i++)
{
map_start_sector[i] =0;
map_num_sectors[i] =0;
}
/* 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)(grub_size_t)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. */
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);
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)(grub_size_t)dummy, -1ULL, GRUB_LISTBLK);
disk_read_hook = 0;
rawread_ignore_memmove_overflow = 0;
if (fsys_table[fsys_type].mount_func == pxe_mount)
{
map_start_sector[0] = (unsigned long long)(grub_size_t)(char*)efi_pxe_buf;
printf("0x%lx+0x%lx", (unsigned long long)(grub_size_t)(char*)efi_pxe_buf >> 9, (filemax + 0x1ff) >> 9);
query_block_entries = blklst_num_entries = 1;
goto fail_read;
}
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 ("%s%lx+%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;
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! */
#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)
//static grub_efi_char16_t chainloader_type = 0;
static grub_efi_handle_t image_handle;
void hexdump(grub_u64_t ofs,char* buf,int len);
void hexdump(grub_u64_t ofs,char* buf,int len)
{
quit_print=0;
int align = len > 16;
while (len>0)
{
int cnt,k,i,j = 3;
if (align)
{
i = ofs & 0xFLL;
if (i)
ofs &= ~0xFLL;
}
else
{
i = 0;
}
if ((ofs >> 32))
j = 7;
grub_printf ("%0*lX: ", j == 3?8:10,ofs);
cnt = 16;
if (cnt > len)
cnt = len + i;
for (k=0;k<16;k++)
{
if (i>k || k >=cnt)
printf(" ");
else
printf("%02X ", (unsigned long)(unsigned char)(buf[k - i]));
if ((k!=15) && ((k & j)==j))
printf(" ");
}
printf("; ");
for (k=0;k<cnt;k++)
{
if (i>k)
putchar(' ',255);
else
{
j = k - i;
putchar((((unsigned char)buf[j]>=32) && ((unsigned char)buf[j]<0x7f))?buf[j]:'.', 255);
}
}
printf("\n");
if (quit_print)
break;
ofs+=16;
cnt -= i;
len -= cnt;
buf += cnt;
}
}
/* cat */
static int cat_func (char *arg, int flags);
static int
cat_func (char *arg, int flags)
{
unsigned char c;
unsigned char s[128];
unsigned long long Hex = 0;
unsigned int len, i, j;
char *p;
unsigned long long skip = 0;
unsigned long long length = 0xffffffffffffffffULL;
char *locate = 0;
char *replace = 0;
unsigned long long locate_align = 1;
unsigned long long len_s;
unsigned long long len_r = 0;
unsigned long long ret = 0;
unsigned long long number = -1ULL;
int locate_ignore_case = 0;
quit_print = 0;
errnum = 0;
for (;;)
{
if (grub_memcmp (arg, "--hex=", 6) == 0)
{
arg += 6;
safe_parse_maxint (&arg, &Hex);
}
else if (grub_memcmp (arg, "--hex", 5) == 0)
{
Hex = 1;
}
else if (grub_memcmp (arg, "--skip=", 7) == 0)
{
arg += 7;
safe_parse_maxint(&arg,&skip);
}
else if (grub_memcmp (arg, "--length=", 9) == 0)
{
arg += 9;
safe_parse_maxint(&arg, &length);
}
else if (grub_memcmp (arg, "--locate=", 9) == 0)
{
locate = arg += 9;
}
else if (grub_memcmp (arg, "--locatei=", 9) == 0)
{
locate_ignore_case = 1;
locate = arg += 10;
}
else if (grub_memcmp (arg, "--replace=", 10) == 0)
{
replace = arg += 10;
}
else if (grub_memcmp (arg, "--locate-align=", 15) == 0)
{
arg += 15;
if (! safe_parse_maxint (&arg, &locate_align))
return 0;
if ((unsigned int)locate_align == 0)
return ! (errnum = ERR_BAD_ARGUMENT);
}
else if (grub_memcmp (arg, "--number=",9) == 0)
{
arg += 9;
safe_parse_maxint (&arg, &number);
}
else
break;
if (errnum)
return 0;
arg = skip_to (0, arg);
}
if (! length)
{
if (grub_memcmp (arg,"()-1\0",5) == 0 )
{
if (! grub_open ("()+1"))
return 0;
filesize = filemax*(unsigned long long)part_start;
}
else if (grub_memcmp (arg,"()\0",3) == 0 )
{
if (! grub_open ("()+1"))
return 0;
filesize = filemax*(unsigned long long)part_length;
}
else
{
int no_decompression_bak = no_decompression;
no_decompression = 1;
if (! grub_open (arg))
{
no_decompression = no_decompression_bak;
return 0;
}
filesize = filemax;
no_decompression = no_decompression_bak;
}
grub_close();
printf_debug0 ("Filesize is 0x%lX\n", (unsigned long long)filesize);
return (filesize>>32)?(unsigned long long)-1:filesize;
}
if (replace)
{
p = replace;
if (*p++ == '*')
{
safe_parse_maxint (&p, &len_r);
errnum = 0;
}
if (! len_r)
{
#if 0
if (*replace == '\"')
{
for (i = 0; i < 128 && (r[i] = *(++replace)) != '\"'; i++);
}else{
for (i = 0; i < 128 && (r[i] = *(replace++)) != ' ' && r[i] != '\t'; i++);
}
r[i] = 0;
replace = (char*)r;
len_r = parse_string (replace);
#else
wee_skip_to(replace,SKIP_WITH_TERMINATE);
c = *replace;
len_r = parse_string (replace);
if (c == '\"')
++replace,len_r -= 2;
#endif
}
else
{
replace = (char*)(grub_size_t)(unsigned long long)len_r;
len_r = Hex?Hex:8;
}
if ((int)len_r <= 0)
{
return ! (errnum = ERR_BAD_ARGUMENT);
}
}
if (! grub_open (arg))
return 0;
if (length > filemax)
length = filemax;
filepos = skip;
if (locate)
{
#if 0
if (*locate == '\"')
{
for (i = 0; i < 128 && (s[i] = *(++locate)) != '\"'; i++);
}else{
for (i = 0; i < 128 && (s[i] = *(locate++)) != ' ' && s[i] != '\t'; i++);
}
s[i] = 0;
len_s = parse_string ((char *)s);
locate = s;
#else
wee_skip_to(locate,SKIP_WITH_TERMINATE);
c = *locate;
len_s = parse_string (locate);
if (c == '\"')
++locate,len_s -= 2;
#endif
if (len_s == 0 || len_s > 16)
{
grub_close();
return ! (errnum = ERR_BAD_ARGUMENT);
}
//j = skip;
grub_memset ((char *)(SCRATCHADDR), 0, 32);
length += skip;
unsigned long long k,l;
for (i = 0,j = skip; ; j += 16)
{
len = 0;
if (j < length)
{
len = grub_read ((unsigned long long)(grub_size_t)(char *)(SCRATCHADDR + 16), 16, 0xedde0d90);
}
if (len < 16)
{
k = j > length ? 16 - (j - length):16 + len;
grub_memset ((char *)(SCRATCHADDR + (int)k), 0, 32 - (int)k);
}
if (j>length)
l = 16 - (j - length);
else
l = 16;
if (j != skip)
{
while (i < l)
{
k = j - 16 + i;
if ((locate_align == 1 || ! ((grub_size_t)k % (grub_size_t)locate_align))
&& strncmpx (locate, (char *)(SCRATCHADDR + (grub_size_t)i), len_s,locate_ignore_case) == 0)
{
/* print the address */
if (!replace || debug > 1)
grub_printf (" %lX", (unsigned long long)k);
/* replace strings */
if (replace)
{
unsigned long long filepos_bak = filepos;
filepos = k;
/* write len_r bytes at string replace to file!! */
grub_read ((unsigned long long)(grub_size_t)replace,len_r, 0x900ddeed);
i += len_r;
// if (filepos < filepos_bak)
filepos = filepos_bak;
}
else
i += len_s;
ret++;
Hex = k;
if (number <= ret)
{
len = 0;
break;
}
}
else
i++;
}
if (quit_print)
break;
if (len == 0)
{
sprintf(ADDR_RET_STR,"0x%x",Hex);
break;
}
i -= 16;
}
grub_memmove ((char *)SCRATCHADDR, (char *)(SCRATCHADDR + 16), 16);
}
}else if (Hex == (++ret)) /* a trick for (ret = 1, Hex == 1) */
{
j = 16/* - (skip & 0xF)*/;
if (j > length)
j = length;
while ((len = grub_read ((unsigned long long)(grub_size_t)&s, j, 0xedde0d90)))
{
hexdump(skip,(char*)&s,len);
if (quit_print)
break;
skip += len;
length -= len;
j = (length >= 16)?16:length;
}
}else
for (j = 0; j < length && grub_read ((unsigned long long)(grub_size_t)&c, 1, 0xedde0d90) && c; j++)
{
grub_putchar (c, 255);
if (quit_print)
break;
}
grub_close ();
return ret;
}
static struct builtin builtin_cat =
{
"cat",
cat_func,
BUILTIN_MENU | BUILTIN_CMDLINE | BUILTIN_SCRIPT | BUILTIN_HELP_LIST | BUILTIN_IFTITLE,
"cat [--hex] [--skip=S] [--length=L] [--locate[i]=STRING] [--replace=REPLACE]\n"
"\t [--locate-align=A] [--number=n] FILE",
"Print the contents of the file FILE,"
"Or print the locations of the string STRING in FILE,"
"--replace replaces STRING with REPLACE in FILE."
"--number use with --locate,the max number for locate",
};
void map_to_svbus (grub_efi_physical_address_t address);
void
map_to_svbus (grub_efi_physical_address_t address)
{
int i;
//复制映射插槽
for (i = 0; i < DRIVE_MAP_SIZE; i++)
{
if (drive_map_slot_empty (disk_drive_map[i])) //判断驱动器映像插槽是否为空 为空,返回1
break;
//滤除软盘
if (disk_drive_map[i].from_drive < 0x80)
continue;
//复制映射插槽
grub_memmove ((char *)((char *)(grub_size_t)address + i*24), (char *)&disk_drive_map[i], 24);
*(char*)((char *)(grub_size_t)address + i*24 + 2) = 0xfe; //from最大磁头号
if (disk_drive_map[i].from_drive >= 0xa0)
*(char*)((char *)(grub_size_t)address + i*24 + 5) = 0x20; //from驱动器是cdrom
}
//复制碎片插槽
grub_memmove ((char *)((char *)(grub_size_t)address + 0x120), (char *)&disk_fragment_map, 0x400);
}
//使用于get_efi_cdrom_device_boot_path，find_specified_file，chainloader_func，command_func，uuid_func
static char chainloader_file[256];
int get_efi_cdrom_device_boot_path (int drive);
int
get_efi_cdrom_device_boot_path (int drive) //获得光盘驱动器引导路径
{
char *cache = 0;
int k = 0;
cache = grub_zalloc (0x800); //分配缓存
if (!cache)
return 0;
cdrom_volume_descriptor_t *vol = (cdrom_volume_descriptor_t *)cache;
eltorito_catalog0_t *catalog = NULL;
if (get_diskinfo (drive, &tmp_geom, 0)) //获得当前驱动器的磁盘信息
{
errnum = ERR_NO_DISK;
goto fail_close_free;
}
grub_sprintf (chainloader_file, "(0x%X)+0x%lX\0", drive, (unsigned long long)tmp_geom.total_sectors);
if (! grub_open (chainloader_file))
goto fail_close_free;
filepos = 17 * 0x800;
grub_read ((unsigned long long)(grub_size_t) vol, 0x800, 0xedde0d90); //读引导扇区(17,规定值,不变),0x800字节
if (vol->unknown.type != CDVOL_TYPE_STANDARD || //启动记录卷,类型 CDVOL_TYPE_STANDARD=0
grub_memcmp ((const char *)vol->boot_record_volume.system_id, (const char *)CDVOL_ELTORITO_ID, //启动记录卷,系统id CDVOL_ELTORITO_ID="EL TORITO SPECIFICATION"
sizeof (CDVOL_ELTORITO_ID) - 1) != 0)
goto fail_close_free;
catalog = (eltorito_catalog0_t *) cache;
filepos = *((grub_efi_uint32_t*) vol->boot_record_volume.elt_catalog) * 0x800; //13*800
grub_read ((unsigned long long)(grub_size_t) catalog, 0x800, 0xedde0d90);
if (catalog[0].indicator1 != ELTORITO_ID_CATALOG)
goto fail_close_free;
for (k = 0; k < 5; k++)
{
if ((catalog[k].indicator1 == ELTORITO_ID_SECTION_HEADER_FINAL && //ELTORITO_ID_SECTION_HEADER_FINAL=0x91
catalog[k].platform_id == EFI_PARTITION && //EFI_PARTITION=0xef
catalog[k].indicator88 == ELTORITO_ID_SECTION_BOOTABLE) //ELTORITO_ID_SECTION_BOOTABLE=0x88
|| k == 4)
{
if (k == 4) //如果没有 '91 EF 01',不是双启动(bioe-uefi),有可能是bios,也可能是uefi.不放过任何机会!
k = 0;
boot_entry = catalog[k].indicator1; //91
part_addr = catalog[k].lba; //19*800=c800
part_size = catalog[k].sector_count; //1*200=200
break;
}
}
filepos = part_addr * 0x800; //19*800
struct master_and_dos_boot_sector *BS = (struct master_and_dos_boot_sector *) cache;
grub_read ((unsigned long long)(grub_size_t)BS, 0x800, 0xedde0d90);
if (!probe_bpb(BS))
part_size = probed_total_sectors;
if (part_size < 0xB40) //BLOCK_OF_1_44MB=0xB40*200=168000
part_size = 0xB40; //1.44Mb软盘尺寸
part_data = 0;
grub_free (cache);
return 1;
fail_close_free:
grub_free (cache);
return 0;
}
int find_specified_file (int drive, int partition, char* file);
int
find_specified_file (int drive, int partition, char* file)
{
int val;
int tem_drive = current_drive;
int tem_partition = current_partition;
sprintf (chainloader_file, "(hd%d,%d)%s\0", drive & 0x7f, partition >> 16, file);
putchar_hooked = (unsigned char*)1; //不打印ls_func信息
val = ls_func (chainloader_file, 1);
putchar_hooked = 0;
current_partition = tem_partition;
current_drive = tem_drive;
return val;
}
int get_efi_hd_device_boot_path (int drive);
int
get_efi_hd_device_boot_path (int drive) //获得硬盘驱动器引导路径
{
struct grub_part_data *p;
char *cache = 0;
int self_locking = 0;
cache = grub_zalloc (0x800); //分配缓存
if (!cache)
return 0;
for (p = partition_info; p; p = p->next)
{
if (p->drive != drive)
continue;
if (p->partition_type != 0xee && !self_locking) //如果是MBR分区类型, 首先启动活动分区
{
struct grub_part_data *p_back = p;
while (p && p->drive == drive && p->partition_activity_flag == 0) //查找活动分区
p = p->next;
if (p && find_specified_file(drive, p->partition, EFI_REMOVABLE_MEDIA_FILE_NAME) == 1) //搜索文件 bootx64.efi
goto complete;
p = p_back;
self_locking = 1;
}
if (find_specified_file(drive, p->partition, EFI_REMOVABLE_MEDIA_FILE_NAME) == 1) //搜索文件 bootx64.efi
goto complete;
}
grub_free (cache);
return 0;
complete:
part_data = p;
part_addr = p->partition_start;
part_size = p->partition_len;
grub_free (cache);
return 1;
}
static void *linuxefi_mem;
static unsigned long long linuxefi_size;
static unsigned char *initrdefi_mem;
static unsigned int linuxefi_handover_offset;
struct linux_kernel_params *linuxefi_params;
static char *linuxefi_cmdline;
#define BYTES_TO_PAGES(bytes) (((bytes) + 0xfff) >> 12)
typedef void (*handover_func) (void *, grub_efi_system_table_t *, void *);
static void
linuxefi_boot (void *kernel_addr, grub_off_t offset,
void *kernel_params)
{
grub_efi_loaded_image_t *loaded_image = NULL;
handover_func hf;
/*
* Since the EFI loader is not calling the LoadImage() and StartImage()
* services for loading the kernel and booting respectively, it has to
* set the Loaded Image base address.
*/
loaded_image = grub_efi_get_loaded_image (grub_efi_image_handle);
if (loaded_image)
loaded_image->image_base = kernel_addr;
hf = (handover_func)((char *)kernel_addr + offset);
hf (grub_efi_image_handle, grub_efi_system_table, kernel_params);
}
/* boot */
static int boot_func (char *arg, int flags);
static int
boot_func (char *arg, int flags)
{
grub_efi_boot_services_t *b;
grub_efi_status_t status;
b = grub_efi_system_table->boot_services; //引导服务
if (kernel_type == KERNEL_TYPE_LINUX)
{
int offset = 0;
#if !defined(__i386__)
offset = 512;
#endif
__asm__ volatile ("cli");
linuxefi_boot (linuxefi_mem, linuxefi_handover_offset + offset,
linuxefi_params);
/* should not return */
if (initrdefi_mem)
efi_call_2 (b->free_pages, (grub_size_t)initrdefi_mem,
BYTES_TO_PAGES(linuxefi_params->ramdisk_size));
if (linuxefi_cmdline)
efi_call_2 (b->free_pages, (grub_size_t)linuxefi_cmdline,
BYTES_TO_PAGES(linuxefi_params->cmdline_size + 1));
if (linuxefi_mem)
efi_call_2 (b->free_pages, (grub_size_t)linuxefi_mem, BYTES_TO_PAGES(linuxefi_size));
if (linuxefi_params)
efi_call_2 (b->free_pages, (grub_size_t)linuxefi_params, BYTES_TO_PAGES(16384));
}
else
{
map_to_svbus(grub4dos_self_address); //为svbus复制插槽
//不能释放，否则无法启动