1 ;; $Id: ui.inc,v 1.20 2005/04/08 16:33:32 hpa Exp $
2 ;; -----------------------------------------------------------------------
4 ;; Copyright 1994-2002 H. Peter Anvin - All Rights Reserved
6 ;; This program is free software; you can redistribute it and/or modify
7 ;; it under the terms of the GNU General Public License as published by
8 ;; the Free Software Foundation, Inc., 53 Temple Place Ste 330,
9 ;; Boston MA 02111-1307, USA; either version 2 of the License, or
10 ;; (at your option) any later version; incorporated herein by reference.
12 ;; -----------------------------------------------------------------------
15 ; This file should be entered with the config file open (for getc)
17 call parse_config ; Parse configuration file
20 ; Check whether or not we are supposed to display the boot prompt.
23 cmp word [ForcePrompt],byte 0 ; Force prompt?
25 test byte [KbdFlags],5Bh ; Caps, Scroll, Shift, Alt
26 jz auto_boot ; If neither, default boot
32 mov byte [FuncFlag],0 ; <Ctrl-F> not pressed
35 ; get the very first character -- we can either time
36 ; out, or receive a character press at this time. Some dorky BIOSes stuff
37 ; a return in the buffer on bootup, so wipe the keyboard buffer first.
39 clear_buffer: mov ah,11h ; Check for pending char
44 jmp short clear_buffer
50 jz get_char ; Timeout == 0 -> no timeout
51 inc cx ; The first loop will happen
52 ; immediately as we don't
53 ; know the appropriate DX value
58 mov dx,[BIOS_timer] ; Get time "of day"
60 cmp dx,ax ; Has the timer advanced?
64 loop time_loop ; If so, decrement counter
68 mov si,Ontimeout ; Copy ontimeout command
69 mov cx,[OntimeoutLen] ; if we have one...
74 get_char_pop: pop eax ; Clear stack
82 got_ascii: cmp al,7Fh ; <DEL> == <BS>
87 cmp di,command_line ; Space must not be first
89 enter_char: test byte [FuncFlag],1
97 .not_ctrl_f: cmp di,max_cmd_len+command_line ; Check there's space
100 call writechr ; Echo to screen
102 not_ascii: mov byte [FuncFlag],0
105 cmp al,'F' & 1Fh ; <Ctrl-F>
107 cmp al,'U' & 1Fh ; <Ctrl-U>
108 je kill_command ; Kill input line
109 cmp al,'V' & 1Fh ; <Ctrl-V>
111 cmp al,'X' & 1Fh ; <Ctrl-X>
113 cmp al,08h ; Backspace
115 backspace: cmp di,command_line ; Make sure there is anything
116 je get_char ; to erase
117 dec di ; Unstore one character
118 mov si,wipe_char ; and erase it from the screen
131 mov byte [FuncFlag],1
135 ctrl_f_0: add al,10 ; <Ctrl-F>0 == F10
141 ; AL = 0 if we get here
147 show_help: ; AX = func key # (0 = F1, 9 = F10)
148 push di ; Save end-of-cmdline pointer
149 shl ax,FILENAME_MAX_LG2 ; Convert to pointer
152 cmp byte [di+NULLOFFSET],NULLFILE
153 je short fk_nofile ; Undefined F-key
155 jz short fk_nofile ; File not found
163 push di ; Command line write pointer
164 mov si,syslinux_banner
169 ; ... fall through ...
171 ; Write the boot prompt and command line again and
172 ; wait for input. Note that this expects the cursor
173 ; to already have been CRLF'd, and that the old value
174 ; of DI (the command line write pointer) is on the stack.
178 pop di ; Command line write pointer
180 mov byte [di],0 ; Null-terminate command line
182 call cwritestr ; Write command line so far
188 mov cx,(max_cmd_len+4) >> 2
190 jmp short load_kernel
193 cmp di,command_line ; Did we just hit return?
195 xor al,al ; Store a final null
198 load_kernel: ; Load the kernel now
200 ; First we need to mangle the kernel name the way DOS would...
210 ; Fast-forward to first option (we start over from the beginning, since
211 ; mangle_name doesn't necessarily return a consistent ending state.)
216 clin_is_wsp: and al,al
221 clin_opt_ptr: dec si ; Point to first nonblank
222 mov [CmdOptPtr],si ; Save ptr to first option
224 ; If "allowoptions 0", put a null character here in order to ignore any
225 ; user-specified options.
227 mov ax,[AllowOptions]
234 ; Now check if it is a "virtual kernel"
237 xor si,si ; Beginning of vk_seg
239 cmp si,[VKernelBytes]
249 ; SI updated on return
251 sub di,cx ; Return to beginning of buf
261 ; We *are* using a "virtual kernel"
265 push word real_mode_seg
268 mov si,VKernelBuf+vk_append
269 mov cx,[VKernelBuf+vk_appendlen]
271 mov [CmdLinePtr],di ; Where to add rest of cmd
275 mov si,VKernelBuf+vk_rname
276 mov cx,FILENAME_MAX ; We need ECX == CX later
280 mov al,[VKernelBuf+vk_ipappend]
283 xor bx,bx ; Try only one version
285 %if IS_PXELINUX || IS_ISOLINUX
286 ; Is this a "localboot" pseudo-kernel?
288 cmp byte [VKernelBuf+vk_rname+4], 0
290 cmp byte [VKernelBuf+vk_rname], 0
292 jne get_kernel ; No, it's real, go get it
294 mov ax, [VKernelBuf+vk_rname+1]
303 ; Not a "virtual kernel" - check that's OK and construct the command line
305 cmp word [AllowImplicit],byte 0
321 ; Find the kernel on disk
323 get_kernel: mov byte [KernelName+FILENAME_MAX],0 ; Zero-terminate filename/extension
324 %if IS_SYSLINUX || IS_MDSLINUX ; SYSLINUX has to deal with DOS mangled names...
325 mov eax,[KernelName+8] ; Save initial extension
326 mov [exten_table_end],eax ; Last case == initial ext.
328 mov di,KernelName+4*IS_PXELINUX
330 mov cx,FILENAME_MAX-5 ; Need 4 chars + null
331 repne scasb ; Scan for final null
333 dec di ; Point to final null
334 .no_skip: mov [KernelExtPtr],di
337 .search_loop: push bx
338 mov di,KernelName ; Search on disk
342 mov eax,[bx] ; Try a different extension
343 %if IS_SYSLINUX || IS_MDSLINUX
344 mov [KernelName+8],eax
346 mov si,[KernelExtPtr]
351 cmp bx,exten_table_end
352 jna .search_loop ; allow == case (final case)
353 ; Fall into bad_kernel
355 ; bad_kernel: Kernel image not found
356 ; bad_implicit: The user entered a nonvirtual kernel name, with "implicit 0"
367 call unmangle_name ; Get human form
368 mov si,err_notfound ; Complain about missing kernel
373 jmp abort_load ; Ask user for clue
376 ; on_error: bad kernel, but we have onerror set
387 pop di ; <E> di == command_line
388 pop bx ; <D> bx == [OnerrorLen]
389 je bad_kernel.really ; Onerror matches command_line already
390 neg bx ; bx == -[OnerrorLen]
391 lea cx,[max_cmd_len+bx]
392 ; CX == max_cmd_len-[OnerrorLen]
393 mov di,command_line+max_cmd_len-1
394 mov byte [di+1],0 ; Enforce null-termination
397 rep movsb ; Make space in command_line
399 pop cx ; <C> cx == [OnerrorLen]
400 pop di ; <B> di == command_line
401 pop si ; <A> si == Onerror
406 ; kernel_corrupt: Called if the kernel file does not seem healthy
408 kernel_corrupt: mov si,err_notkernel
411 ; This is it! We have a name (and location on the disk)... let's load
412 ; that sucker!! First we have to decide what kind of file this is; base
413 ; that decision on the file extension. The following extensions are
414 ; recognized; case insensitive:
416 ; .com - COMBOOT image
417 ; .cbt - COMBOOT image
420 ; .0 - PXE bootstrap program (PXELINUX only)
422 ; .bss - Boot sector, but transfer over DOS superblock (SYSLINUX only)
423 ; .img - Floppy image (ISOLINUX only)
425 ; Anything else is assumed to be a Linux kernel.
433 mov [KernelCNameLen],di
436 %if IS_SYSLINUX || IS_MDSLINUX
437 mov ecx,[KernelName+7]
442 mov di,KernelName+4*IS_PXELINUX
448 .one_step: mov ecx,[di-4] ; 4 bytes before end
454 ; At this point, DX:AX contains the size of the kernel, and SI contains
455 ; the file handle/cluster pointer.
457 or ecx,20202000h ; Force lower case
473 %if IS_SYSLINUX || IS_MDSLINUX
486 ; Otherwise Linux kernel
490 KernelExtPtr resw 1 ; During search, final null pointer
491 CmdOptPtr resw 1 ; Pointer to first option on cmd line
492 KbdFlags resb 1 ; Check for keyboard escapes
493 FuncFlag resb 1 ; Escape sequences received from keyboard