mkinitrd-magellan/isolinux/abort.inc

; -----------------------------------------------------------------------
;
;   Copyright 2005-2009 H. Peter Anvin - All Rights Reserved
;   Copyright 2009 Intel Corporation; author: H. Peter Anvin
;
;   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

;
; dot_pause: same as abort_check, except prints a dot, too
;            assumes CS == DS
;
dot_pause:
		push si
		mov si,dot_msg
		call writestr_qchk
		pop si
		; fall through

;
; abort_check: let the user abort with <ESC> or <Ctrl-C>
;
abort_check:
		call reset_idle			; Not idle despite pollchar
		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
		mov bx,enter_command
		jmp abort_load_chain

;
; 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
;	      BX    = future entry point (abort_load_chain)
;
abort_load:
		mov bx,error_or_command
abort_load_chain:
		RESET_STACK_AND_SEGS AX
                call writestr                  ; Expects SI -> error msg

		; Return to the command prompt
		jmp bx

;
; error_or_command: Execute ONERROR if appropriate, otherwise enter_command
;
error_or_command:
		mov cx,[OnerrorLen]
		and cx,cx
		jnz on_error
		jmp enter_command

		section .data
aborted_msg	db ' aborted.', CR, LF, 0

		section .text
1	niro	532	; -----------------------------------------------------------------------
2			;
3	niro	1133	; Copyright 2005-2009 H. Peter Anvin - All Rights Reserved
4			; Copyright 2009 Intel Corporation; author: H. Peter Anvin
5			;
6	niro	532	; 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.
11			;
12			; -----------------------------------------------------------------------
13
14			;
15			; abort.inc
16			;
17			; Code to terminate a kernel load
18			;
19
20			section .text
21	niro	1133
22	niro	532	;
23	niro	1133	; dot_pause: same as abort_check, except prints a dot, too
24			; assumes CS == DS
25			;
26			dot_pause:
27			push si
28			mov si,dot_msg
29			call writestr_qchk
30			pop si
31			; fall through
32
33			;
34	niro	532	; abort_check: let the user abort with <ESC> or <Ctrl-C>
35			;
36			abort_check:
37	niro	1133	call reset_idle ; Not idle despite pollchar
38	niro	532	call pollchar
39			jz .ret1
40			pusha
41			call getchar
42			cmp al,27 ; <ESC>
43			je .kill
44			cmp al,3 ; <Ctrl-C>
45			je .kill
46			.ret2: popa
47			.ret1: ret
48
49			.kill: mov si,aborted_msg
50	niro	1133	mov bx,enter_command
51			jmp abort_load_chain
52	niro	532
53			;
54			; abort_load: Called by various routines which wants to print a fatal
55			; error message and return to the command prompt. Since this
56			; may happen at just about any stage of the boot process, assume
57			; our state is messed up, and just reset the segment registers
58			; and the stack forcibly.
59			;
60			; SI = offset (in _text) of error message to print
61	niro	1133	; BX = future entry point (abort_load_chain)
62	niro	532	;
63			abort_load:
64	niro	1133	mov bx,error_or_command
65			abort_load_chain:
66			RESET_STACK_AND_SEGS AX
67			call writestr ; Expects SI -> error msg
68	niro	532
69			; Return to the command prompt
70	niro	1133	jmp bx
71
72			;
73			; error_or_command: Execute ONERROR if appropriate, otherwise enter_command
74			;
75			error_or_command:
76			mov cx,[OnerrorLen]
77			and cx,cx
78			jnz on_error
79	niro	532	jmp enter_command
80	niro	1133
81			section .data
82			aborted_msg db ' aborted.', CR, LF, 0
83
84			section .text