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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 ah,0x1 ;get scnacode from kb (non-blocking)
int 0x16
jnz get_key ; nothing to preempt
jmp wait_key
get_key:
mov ah,0 ;get key from buffer
int 0x16
; mov al,ah
; call print_hex_byte
; call print_nextline
jmp next_key
;;;;;;;;;;;;;;;;;
wait_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
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