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
70
71
72
73
74
75
76
77
78
79
|
VESA_CHECK1:
db "VESA: get modes!",0
VESA_CHECK2:
db "VESA: get info on target mode!",0
VESA_CHECK3:
db "VESA: switching to target mode!",0
VESA_PAUSE:
db "[Press any key to switch to VESA 0x114]",0
VesaSetup:
pusha
;VESA: get all available vesa modes!
mov ax,0 ; set target address in es:di (0:offset)
mov es,ax
mov di,VESA_MODES
mov ax,0x4f00 ;vesa function: Get Controller Info
int 0x10 ; call the interrupt to get the data from the bios!
vesa_err:
mov bx, VESA_CHECK1
call print_string
call print_nextline
cmp ax,0x004f
je vesa_ok
jmp vesa_err
vesa_ok:
;
;VESA: get vesa info on mode of interest
mov ax,0 ; set target address in es:di (0:offset)
mov es,ax
mov di,VESA_MODE_INFO
mov ax,0x4f01 ;vesa function: Get Mode Info
mov cx,VESA_MODE_SELECT
int 0x10 ; call the interrupt to get the data from the bios!
vesa_err2:
mov bx, VESA_CHECK2
call print_string
call print_nextline
cmp ax,0x004f
je vesa_ok2
jmp vesa_err2
vesa_ok2:
;show press any key
; call print_nextline
; mov bx, VESA_PAUSE
; call print_string
; call print_nextline
;preempt keyboard buffer
; next_key:
;
; mov al,0
; mov ah,1 ; block waiting for keyboard scancode
;
; int 0x16
; cmp ax,0
; jne next_key
;
; mov ah,0 ; block waiting for keyboard scancode
; int 0x16
;VESA: finally switch to the mode of choice!
mov ax,0x4f02 ;vesa function: Set Mode
mov bx,VESA_MODE_SELECT
int 0x10
cmp ax,0x004f
je vesa_ok3
vesa_err3:
mov bx, VESA_CHECK3
call print_string
call print_nextline
jmp vesa_err3
vesa_ok3:
popa
ret
|
