summaryrefslogtreecommitdiff
path: root/parseconfig.inc
blob: ab832b6dcf1408229123a3684389af5b5f89543a (plain)
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
;; -----------------------------------------------------------------------
;;
;;   Copyright 1994-2007 H. Peter Anvin - All Rights Reserved
;;
;;   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, Inc., 53 Temple Place Ste 330,
;;   Boston MA 02111-1307, USA; either version 2 of the License, or
;;   (at your option) any later version; incorporated herein by reference.
;;
;; -----------------------------------------------------------------------

;;
;; parseconfig.inc
;;
;; Configuration file operations
;;

		section .text
;
; "default" command
;
pc_default:	mov di,default_cmd
		call getline
		mov byte [di-1],0		; null-terminate
		ret

;
; "ontimeout" command
;
pc_ontimeout:	mov di,Ontimeout
		call getline
		sub di,Ontimeout+1		; Don't need final space
		mov [OntimeoutLen],di
		ret

;
; "onerror" command
;
pc_onerror:	mov di,Onerror
		call getline
		sub di,Onerror
		mov [OnerrorLen],di
		ret

;
; "append" command
;
pc_append:      cmp byte [VKernel],0
		ja .vk
                mov di,AppendBuf
		call getline
                sub di,AppendBuf
.app1:		mov [AppendLen],di
		ret
.vk:		mov di,VKernelBuf+vk_append	; "append" command (vkernel)
		call getline
		sub di,VKernelBuf+vk_append
                cmp di,byte 2
                jne .app2
                cmp byte [VKernelBuf+vk_append],'-'
                jne .app2
                xor di,di			; If "append -" -> null string
.app2:		mov [VKernelBuf+vk_appendlen],di
		ret

;
; "ipappend" command (PXELINUX only)
;
%if IS_PXELINUX
pc_ipappend:	call getint
		jc .err
		cmp byte [VKernel],0
		jne .vk
		mov [IPAppend],bl
.err:		ret
.vk:		mov [VKernelBuf+vk_ipappend],bl
		ret
%endif

;
; "localboot" command (PXELINUX, ISOLINUX)
;
%if IS_PXELINUX || IS_ISOLINUX
pc_localboot:	call getint
		cmp byte [VKernel],0		; ("label" section only)
		je .err
		mov di,VKernelBuf+vk_rname
		xor ax,ax
		mov cx,FILENAME_MAX
		rep stosb			; Null kernel name
%if IS_PXELINUX
		; PXELINUX uses the first 4 bytes of vk_rname for the
		; mangled IP address
		mov [VKernelBuf+vk_rname+5], bx	; Return type
%else
		mov [VKernelBuf+vk_rname+1], bx	; Return type
%endif
.err:		ret
%endif

;
; "kernel", "config", ... command
;
pc_kernel:	cmp byte [VKernel],0
		je .err				; ("label" section only)
		mov [VKernelBuf+vk_type],al
		call pc_getline
		mov di,VKernelBuf+vk_rname
		call mangle_name
.err:		ret

;
; "timeout", "totaltimeout" command
;
; N.B. 1/10 s ~ 1.D2162AABh clock ticks
;
pc_timeout:	push ax
		call getint
		pop si
		jc .err
		mov eax,0D2162AABh
		mul ebx				; clock ticks per 1/10 s
		add ebx,edx
		mov [si],ebx
.err:		ret


;
; "totaltimeout" command
;
pc_totaltimeout:

;
; Generic integer variable setting commands:
; "prompt", "implicit"
;
pc_setint16:
		push ax
		call getint
		pop si
		jc .err
		mov [si],bx
.err:		ret

;
; Generic file-processing commands:
; "display", "font", "kbdmap", "include"
;
pc_filecmd:	push ax				; Function to tailcall
		call pc_getline
		mov di,MNameBuf
		call mangle_name
		call searchdir			; tailcall
		jnz .ok
		pop ax				; Drop the successor function
.ok:		ret				; Tailcall if OK, error return

;
; "include" command (invoked from pc_filecmd)
;
pc_include:	call openfd
		jz .err
		inc word [IncludeLevel]
.err:		ret

;
; "serial" command
;
pc_serial:	call getint
		jc .err
		push bx				; Serial port #
		call skipspace
		jnc .ok
		pop bx
.err:		ret
.ok:
		call ungetc
		call getint
		mov [FlowControl], word 0	; Default to no flow control
		jc .nobaud
.valid_baud:
		push ebx
		call skipspace
		jc .no_flow
		call ungetc
		call getint			; Hardware flow control?
		jnc .valid_flow
.no_flow:
		xor bx,bx			; Default -> no flow control
.valid_flow:
		and bh,0Fh			; FlowIgnore
		shl bh,4
		mov [FlowIgnore],bh
		mov bh,bl
		and bx,0F003h			; Valid bits
		mov [FlowControl],bx
		pop ebx				; Baud rate
		jmp short .parse_baud
.nobaud:
		mov ebx,DEFAULT_BAUD		; No baud rate given
.parse_baud:
		pop di				; Serial port #
		cmp ebx,byte 75
		jb .err				; < 75 baud == bogus
		mov eax,BAUD_DIVISOR
		cdq
		div ebx
		mov [BaudDivisor],ax
		push ax				; Baud rate divisor
		cmp di,3
		ja .port_is_io			; If port > 3 then port is I/O addr
		shl di,1
		mov di,[di+serial_base]		; Get the I/O port from the BIOS
.port_is_io:
		mov [SerialPort],di

		;
		; Begin code to actually set up the serial port
		;
		lea dx,[di+3]			; DX -> LCR
		mov al,83h			; Enable DLAB
		call slow_out

		pop ax				; Divisor
		mov dx,di			; DX -> LS
		call slow_out

		inc dx				; DX -> MS
		mov al,ah
		call slow_out

		mov al,03h			; Disable DLAB
		inc dx				; DX -> LCR
		inc dx
		call slow_out

		in al,dx			; Read back LCR (detect missing hw)
		cmp al,03h			; If nothing here we'll read 00 or FF
		jne .serial_port_bad		; Assume serial port busted
		dec dx
		dec dx				; DX -> IER
		xor al,al			; IRQ disable
		call slow_out

		inc dx				; DX -> FCR/IIR
		mov al,01h
		call slow_out			; Enable FIFOs if present
		in al,dx
		cmp al,0C0h			; FIFOs enabled and usable?
		jae .fifo_ok
		xor ax,ax			; Disable FIFO if unusable
		call slow_out
.fifo_ok:

		inc dx
		inc dx				; DX -> MCR
		in al,dx
		or al,[FlowOutput]		; Assert bits
		call slow_out

		; Show some life
		cmp byte [SerialNotice],0
		je .notfirst
		mov byte [SerialNotice],0

		mov si,syslinux_banner
		call write_serial_str
		mov si,copyright_str
		call write_serial_str
.notfirst:
		ret

.serial_port_bad:
		mov [SerialPort], word 0
		ret

;
; "F"-key command
;
pc_fkey:	push ax
		call pc_getline
		pop di
		call mangle_name		; Mangle file name
		ret

;
; "label" command
;
pc_label:	call commit_vk			; Commit any current vkernel
		mov di,VKernelBuf		; Erase the vkernelbuf for better compression
		mov cx,(vk_size >> 1)
		xor ax,ax
		rep stosw
		call pc_getline
		mov di,VKernelBuf+vk_vname
		call mangle_name		; Mangle virtual name
		mov byte [VKernel],1		; We've seen a "label" statement
		mov si,VKernelBuf+vk_vname	; By default, rname == vname
		; mov di,VKernelBuf+vk_rname	; -- already set
		mov cx,FILENAME_MAX
		rep movsb
                mov si,AppendBuf		; Default append==global append
                mov di,VKernelBuf+vk_append
                mov cx,[AppendLen]
                mov [VKernelBuf+vk_appendlen],cx
                rep movsb
%if IS_PXELINUX					; PXELINUX only
		mov al,[IPAppend]		; Default ipappend==global ipappend
		mov [VKernelBuf+vk_ipappend],al
%endif
		ret

;
; "say" command
;
pc_say:		call pc_getline			; "say" command
		call writestr
		jmp crlf			; tailcall

;
; "text" command; ignore everything until we get an "endtext" line
;
pc_text:	call pc_getline			; Ignore rest of line
.loop:
		call pc_getline
		jc .eof

		; Leading spaces are already removed...
		lodsd
		and eax,0xdfdfdfdf		; Upper case
		cmp eax,'ENDT'
		jne .loop
		lodsd
		and eax,0x00dfdfdf		; Upper case and mask
		cmp eax,'EXT'
		jne .loop
		; If we get here we hit ENDTEXT
.eof:
		ret

;
; Comment line
;
pc_comment:	; Fall into pc_getline

;
; Common subroutine: load line into trackbuf; returns with SI -> trackbuf
; CF is set on EOF.
;
pc_getline:	mov di,trackbuf
		push di
		call getline
		mov byte [di],0			; Null-terminate
		pop si
		ret

;
; Main loop for configuration file parsing
;
parse_config:
		mov di,VKernelBuf		; Clear VKernelBuf at start
		xor ax,ax
		mov cx,vk_size
		rep stosb

.again:
		call getcommand			; Parse one command
                jnc .again			; If not EOF...
		call close
		dec word [IncludeLevel]		; Still parsing?
		jnz .again

		;
		; The fall through to commit_vk to commit any final
		; VKernel being read
		;
;
; commit_vk: Store the current VKernelBuf into buffer segment
;
commit_vk:
		; For better compression, clean up the append field
		mov ax,[VKernelBuf+vk_appendlen]
		mov di,VKernelBuf+vk_append
		add di,ax
		mov cx,max_cmd_len+1
		sub cx,ax
		xor ax,ax
		rep stosb

		; Pack temporarily into trackbuf
		mov si,VKernelBuf
		mov di,trackbuf
		mov cx,vk_size
		call rllpack
		; Now DX = number of bytes
		mov di,[VKernelBytes]
		mov cx,dx
		add dx,di
		jc .overflow			; If > 1 segment
		mov [VKernelBytes],dx
		mov si,trackbuf
		push es
		push word vk_seg
		pop es
		rep movsb
		pop es
		ret
.overflow:
		mov si,vk_overflow_msg
		call writestr
		ret

		section .data
vk_overflow_msg	db 'Out of memory parsing config file', CR, LF, 0
SerialNotice	db 1			; Only print this once

		section .config
		align 4, db 0
KbdTimeout      dd 0                    ; Keyboard timeout (if any)
TotalTimeout	dd 0			; Total timeout (if any)
AppendLen       dw 0                    ; Bytes in append= command
OntimeoutLen	dw 0			; Bytes in ontimeout command
OnerrorLen	dw 0			; Bytes in onerror command
CmdLinePtr	dw cmd_line_here	; Command line advancing pointer
ForcePrompt	dw 0			; Force prompt
NoEscape	dw 0			; No escape
AllowImplicit   dw 1                    ; Allow implicit kernels
AllowOptions	dw 1			; User-specified options allowed
IncludeLevel	dw 1			; Nesting level
SerialPort	dw 0			; Serial port base (or 0 for no serial port)
VKernelBytes	dw 0			; Number of bytes used by vkernels
VKernel		db 0			; Have we seen any "label" statements?

%if IS_PXELINUX
IPAppend	db 0			; Default IPAPPEND option
%endif

		section .uibss
                alignb 4		; For the good of REP MOVSD
command_line	resb max_cmd_len+2	; Command line buffer
		alignb 4
default_cmd	resb max_cmd_len+1	; "default" command line

%include "rllpack.inc"