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|
; $Id$
; -----------------------------------------------------------------------
;
; Copyright 2005 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.
;
; -----------------------------------------------------------------------
;
; abort.inc
;
; Code to terminate a kernel load
;
section .text
;
; abort_check: let the user abort with <ESC> or <Ctrl-C>
;
abort_check:
call pollchar
jz .ret1
pusha
call getchar
cmp al,27 ; <ESC>
je .kill
cmp al,3 ; <Ctrl-C>
je .kill
.ret2: popa
.ret1: ret
.kill: mov si,aborted_msg
; ... fall through ...
;
; abort_load: Called by various routines which wants to print a fatal
; error message and return to the command prompt. Since this
; may happen at just about any stage of the boot process, assume
; our state is messed up, and just reset the segment registers
; and the stack forcibly.
;
; SI = offset (in _text) of error message to print
;
abort_load:
mov ax,cs ; Restore CS = DS = ES
mov ds,ax
mov es,ax
%if IS_SYSLINUX || IS_EXTLINUX
mov ss,ax ; Just in case...
mov sp,StackBuf-2*3 ; Reset stack
%elif IS_PXELINUX
lss esp,[BaseStack]
%elif IS_ISOLINUX
lss sp,[StackPtr]
%else
NEED TO KNOW HOW TO RESET STACK
%endif
sti
call cwritestr ; Expects SI -> error msg
; Return to the command prompt
jmp enter_command
|
