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
|
diff --git a/core/isolinux.asm b/core/isolinux.asm
index 23429bd..54f2e19 100644
--- a/core/isolinux.asm
+++ b/core/isolinux.asm
@@ -1135,73 +1135,23 @@ all_read:
; (which will be at 16 only for a single-session disk!); from the PVD
; we should be able to find the rest of what we need to know.
;
-get_fs_structures:
- mov eax,[bi_pvd]
- mov bx,trackbuf
- call getonesec
-
- mov eax,[trackbuf+156+2]
- mov [RootDir+dir_lba],eax
- mov [CurrentDir+dir_lba],eax
-%ifdef DEBUG_MESSAGES
- mov si,dbg_rootdir_msg
- call writemsg
- call writehex8
- call crlf
-%endif
- mov eax,[trackbuf+156+10]
- mov [RootDir+dir_len],eax
- mov [CurrentDir+dir_len],eax
- add eax,SECTOR_SIZE-1
- shr eax,SECTOR_SHIFT
- mov [RootDir+dir_clust],eax
- mov [CurrentDir+dir_clust],eax
-
- ; Look for an isolinux directory, and if found,
- ; make it the current directory instead of the root
- ; directory.
- ; Also copy the name of the directory to CurrentDirName
- mov word [CurrentDirName],ROOT_DIR_WORD ; Write '/',0 to the CurrentDirName
+ call iso_mount
mov di,boot_dir ; Search for /boot/isolinux
- mov al,02h
- push di
- call searchdir_iso
- pop di
- jnz .found_dir
- mov di,isolinux_dir
- mov al,02h ; Search for /isolinux
- push di
- call searchdir_iso
- pop di
- jz .no_isolinux_dir
+ call setcwd
+ jnc .found_dir
+ mov di,isolinux_dir ; Search for /isolinux
+ call setcwd
.found_dir:
- ; Copy current directory name to CurrentDirName
- push si
- push di
- mov si,di
- mov di,CurrentDirName
- call strcpy
- mov byte [di],0 ;done in case it's not word aligned
- dec di
- mov byte [di],'/'
- pop di
- pop si
- mov [CurrentDir+dir_len],eax
- mov eax,[si+file_left]
- mov [CurrentDir+dir_clust],eax
- xor eax,eax ; Free this file pointer entry
- xchg eax,[si+file_sector]
- mov [CurrentDir+dir_lba],eax
%ifdef DEBUG_MESSAGES
push si
mov si,dbg_isodir_msg
call writemsg
pop si
+ mov eax,[CurrentDir+dir_lba]
call writehex8
call crlf
%endif
-.no_isolinux_dir:
;
; Locate the configuration file
@@ -1706,6 +1656,90 @@ getfssec:
TRACER 'f'
ret
+;
+; setcwd: Set current working directory.
+;
+; On entry:
+; DI -> directory name
+; On exit:
+; CF = 1 -> error
+;
+; On error, the old working directory is kept.
+;
+setcwd:
+ mov al,02h
+ push di
+ call searchdir_iso
+ pop di
+ stc
+ jz .err
+ mov [CurrentDir+dir_len],eax
+ mov eax,[si+file_left]
+ mov [CurrentDir+dir_clust],eax
+ xor eax,eax
+ xchg eax,[si+file_sector]
+ mov [CurrentDir+dir_lba],eax
+ mov si,di
+ mov di,CurrentDirName
+ cmp si,di
+ jz .ok
+ mov cx,FILENAME_MAX
+ push ds
+ pop es
+.copy:
+ lodsb
+ stosb
+ or al,al
+ loopnz .copy
+ mov byte [di-1],0
+ jnz .err
+.ok:
+ clc
+.err:
+ ret
+
+;
+; Read fs meta data and setup RootDir and CurrentDir.
+;
+; On exit:
+; CF = 1 -> error
+;
+iso_mount:
+ mov eax,[bi_pvd]
+ mov bx,trackbuf
+ call getonesec
+
+ mov eax,[trackbuf+156+10]
+ mov [RootDir+dir_len],eax
+ add eax,SECTOR_SIZE-1
+ shr eax,SECTOR_SHIFT
+ mov [RootDir+dir_clust],eax
+ mov eax,[trackbuf+156+2]
+ mov [RootDir+dir_lba],eax
+
+ push ds
+ pop es
+ mov si,RootDir
+ mov di,CurrentDir
+ mov cx,dir_t_size
+ rep movsb
+
+%ifdef DEBUG_MESSAGES
+ mov si,dbg_rootdir_msg
+ call writemsg
+ call writehex8
+ call crlf
+%endif
+
+ mov di,CurrentDirName
+ call setcwd
+ jnc .ok
+ mov word [CurrentDirName],ROOT_DIR_WORD
+.ok:
+ clc
+ ret
+
+
; -----------------------------------------------------------------------------
; Common modules
; -----------------------------------------------------------------------------
|
