Contents of /trunk/mkinitrd-magellan/isolinux/cpuinit.inc
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Sat Sep 1 22:45:15 2007 UTC (17 years, 1 month ago) by niro
File size: 1887 byte(s)
Sat Sep 1 22:45:15 2007 UTC (17 years, 1 month ago) by niro
File size: 1887 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | ;; $Id: cpuinit.inc,v 1.1 2007-09-01 22:44:04 niro Exp $ |
2 | ;; ----------------------------------------------------------------------- |
3 | ;; |
4 | ;; Copyright 1994-2002 H. Peter Anvin - All Rights Reserved |
5 | ;; |
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. |
11 | ;; |
12 | ;; ----------------------------------------------------------------------- |
13 | |
14 | ;; |
15 | ;; cpuinit.inc |
16 | ;; |
17 | ;; CPU-dependent initialization and related checks. |
18 | ;; |
19 | |
20 | check_escapes: |
21 | mov ah,02h ; Check keyboard flags |
22 | int 16h |
23 | mov [KbdFlags],al ; Save for boot prompt check |
24 | test al,04h ; Ctrl->skip 386 check |
25 | jnz skip_checks |
26 | |
27 | ; |
28 | ; Now check that there is sufficient low (DOS) memory |
29 | ; |
30 | ; NOTE: Linux doesn't use all of real_mode_seg, but we use the same |
31 | ; segment for COMBOOT images, which can use all 64K |
32 | ; |
33 | dosram_k equ (real_mode_seg+0x1000) >> 6 ; Minimum DOS memory (K) |
34 | int 12h |
35 | cmp ax,dosram_k |
36 | jae enough_ram |
37 | mov si,err_noram |
38 | call writestr |
39 | jmp kaboom |
40 | enough_ram: |
41 | skip_checks: |
42 | |
43 | ; |
44 | ; Initialize the bcopy32 code in low memory |
45 | ; |
46 | mov si,section..bcopy32.start |
47 | mov di,__bcopy_start |
48 | mov cx,__bcopy_size >> 2 |
49 | rep movsd |
50 | |
51 | ; |
52 | ; Check if we're 386 (as opposed to 486+); if so we need to blank out |
53 | ; the WBINVD instruction |
54 | ; |
55 | ; We check for 486 by setting EFLAGS.AC |
56 | ; |
57 | %if DO_WBINVD |
58 | pushfd ; Save the good flags |
59 | pushfd |
60 | pop eax |
61 | mov ebx,eax |
62 | xor eax,(1 << 18) ; AC bit |
63 | push eax |
64 | popfd |
65 | pushfd |
66 | pop eax |
67 | popfd ; Restore the original flags |
68 | xor eax,ebx |
69 | jnz is_486 |
70 | ; |
71 | ; 386 - Looks like we better blot out the WBINVD instruction |
72 | ; |
73 | mov byte [try_wbinvd],0c3h ; Near RET |
74 | is_486: |
75 | %endif ; DO_WBINVD |
76 |