source: trunk/Boot.s@ 19

Last change on this file since 19 was 2, checked in by Mattia Monga, 14 years ago

Importazione sorgenti

File size: 1.4 KB
Line 
1/* set to 16 bit mode (80x86 begin in real mode) text section to 0 */
2.code16
3.text
4.org 0x00
5
6.global _start
7_start:
8 mov $0x07C0,%ax
9 mov %ax,%ds
10
11 call booting
12 xor %dx,%dx /* test if dx == 0 */
13 call working
14 call idleloop
15 ret
16
17booting:
18 mov $boot,%si
19 call message
20 call nl
21 ret
22
23message:
24 cld /* set direction to increment */
25 lodsb
26 or %al,%al
27 jz done
28 mov $0xE,%ah
29 mov $7,%bx
30 int $0x10
31 jmp message
32
33done:
34 ret
35
36nl:
37 mov $newline,%si
38 call message
39 ret
40
41working:
42 call nl
43 call nl
44 mov $device,%si
45 call message
46 call waitenter
47 inc %dx
48 cmp $3,%dx
49 je keyboard
50 jmp working
51
52waitenter:
53 call nl
54 movw $cont,%si
55 call message
56 xor %ax,%ax /* Sets AH=0 and AL=0 */
57 int $0x16 /* Wait for keypress */
58 cmp 'T',%al
59 jz taz
60 cmp 't',%al
61 jz taz
62 cmp $13,%al
63 jnz waitenter
64 ret
65
66keyboard:
67 call nl
68 call nl
69 movw $kbd,%si
70 call message
71 call nl
72 movw cont,%si
73 call message
74 ret
75
76taz:
77 call nl
78 call nl
79 movw tazq,%si
80 call message
81 jmp waitenter
82
83idleloop:
84 hlt
85 jmp idleloop
86
87boot:
88 .ascii "Loading UniOS 1.1 Beta..."
89newline:
90 .byte 10, 13, 0
91device:
92 .ascii "Device not responding to SCSI command."
93cont:
94 .ascii "Hit ENTER to continue..."
95kbd:
96 .ascii "Keyboard not responding to SCSI command."
97tazq:
98 .ascii "Yes, TazQ is an Internet crack monkey on wheels."
99
100/* Fill with zero until boottag */
101padlen:
102 .byte boottag - .
103
104.fill 10,1,0
105/* times 510-($-$$) db 0 */
106
107.org 510
108boottag:
109 .word 0xAA55
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