| ; $Id$ |
| ; ----------------------------------------------------------------------- |
| ; |
| ; 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 |
