-
Notifications
You must be signed in to change notification settings - Fork 136
/
builtins.c
16071 lines (14472 loc) · 426 KB
/
builtins.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* 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;
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";
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 = (unsigned char*)"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 length)
{
grub_printf ("[%ld,%d,%d]", sector, offset, length);
}
extern int rawread_ignore_memmove_overflow; /* defined in disk_io.c */
long query_block_entries;
//unsigned long map_start_sector;
//static unsigned long map_num_sectors = 0;
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 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 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 length)
{
#ifdef FSYS_INITRD
if (fsys_table[fsys_type].mount_func == initrdfs_mount)
{
if (query_block_entries >= 0)
printf("(md,0x%lx,0x%x)+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 == buf_geom.sector_size)
{
blklst_num_sectors++;
blklst_last_length = length;
return;
}
else
{
if (query_block_entries >= 0)
{
if (blklst_last_length == buf_geom.sector_size)
grub_printf ("%s%ld+%ld", (blklst_num_entries ? "," : ""),
(unsigned long long)(blklst_start_sector - part_start), blklst_num_sectors);
else if (blklst_num_sectors > 1)
grub_printf ("%s%ld+%ld,%ld[0-%d]", (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%ld[0-%d]", (blklst_num_entries ? "," : ""),
(unsigned long long)(blklst_start_sector - part_start), blklst_last_length);
}
else if (blklst_last_length == buf_geom.sector_size && 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%ld[%d-%d]", (blklst_num_entries ? "," : ""),
(unsigned long long)(sector - part_start), offset, (offset + length));
blklst_num_entries++;
}
else
{
blklst_start_sector = sector;
blklst_num_sectors = 1;
blklst_last_length = length;
}
}
/* blocklist */
static int
blocklist_func (char *arg, int flags)
{
char *dummy = NULL;
int err, i;
#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;
// map_start_sector = 0;
// map_num_sectors = 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)(unsigned int)dummy,-1ULL, GRUB_READ);
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);
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, 0xedde0d90);
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 ("%s%ld+%d", (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 0
if (query_block_entries < 0)
query_block_entries = 0;
#endif
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_NON_CONTIGUOUS;
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 */
errnum = ERR_DISABLE_A20;
break;
}
if (debug > 0)
grub_printf("\nGate A20 is turned off successfully.\n");
}
if (! chainloader_edx_set)
{
chainloader_edx_set = 1;
chainloader_edx = boot_drive;
}
if (! is_raw) //do not check/modify HIDDEN_SECTORS for "--raw"
{
if (chainloader_edx & 0x80)
{
/* if hard-drive BPB shows HIDDEN_SECTORS=0, we assume the
* sector is MBR and it has a partition table. */
if (! probe_bpb((struct master_and_dos_boot_sector *)0x200000))
if (*((unsigned long *) (0x20001C)) == 0)