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
|
; -----------------------------------------------------------------------
;
; Copyright 2005-2007 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.
;
; -----------------------------------------------------------------------
;
; 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
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 cwritestr ; 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
|
