os-k/src/boot/loader16.inc

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;=----------------------------------------------------------------------------=;
; GNU GPL OS/K ;
; ;
; Authors: spectral` ;
; NeoX ;
; ;
; Desc: Kernel (second stage) Loader for OS/K INCLUDED FUNCTIONS ;
; (x86_64 architecture only) ;
;=----------------------------------------------------------------------------=;
[BITS 16]
disable_cursor:
pushf
push eax
push edx
mov dx, 0x3D4
mov al, 0xA ; low cursor shape register
out dx, al
inc dx
mov al, 0x20 ; bits 6-7 unused, bit 5 disables the cursor, bits 0-4 control the cursor shape
out dx, al
pop edx
pop eax
popf
ret
get_dimensions:
push eax
push ebx
mov ah, 0x0F
int 0x10
mov [VGA_HEIGHT], ah
mov [VIDEO_MODE], al
pop ebx
pop eax
ret
Is64bits:
;-----------------------------------------------------------------------;
; Checks if the CPU is compatible with 64-bits operating systems ;
; If the 21th bit of the eax register is set, then CPUID is supported ;
; We then test CPUID's result to see if long mode is supported ;
;-----------------------------------------------------------------------;
pushfd ; recovering the flags in eax
pop eax
mov ecx, eax
xor eax, 0x200000
push eax
popfd
pushfd
pop eax
xor eax, ecx
shr eax, 21
and eax, 1 ; magical spell of murta
push ecx
popfd
test eax, eax
jz .NonCompat ; if (CPUID non supporté) goto NonCompat
mov eax, 0x80000000
cpuid
cmp eax, 0x80000001
jb .NonCompat ; if (eax <= 0x80000001) goto NonCompat
mov eax, 0x80000001
cpuid
test edx, 1 << 29
jz .NonCompat ; if (edx != 1 << 29) goto NonCompat
ret ; back to mbr.s
.NonCompat:
stc
ret
PrintB:
;---------------------------------------------------;
; Print out a simple string. ;
; ;
; Expects: DS:SI = String to print ;
; ;
; Returns: None ;
; ;
;---------------------------------------------------;
lodsb ; Load byte from ds:si to al
or al, al ; If al is empty stop looping
jz .done ; Done looping and return
mov ah, 0x0e ; Teletype output
int 0x10 ; Video interupt
jmp PrintB ; Loop untill string is null
.done:
ret