global _get_fonts_asm

_get_fonts_asm:

; NOTE: this code is taken from https://wiki.osdev.org/VGA_Fonts

    ;in: edi=4k buffer
	;out: buffer filled with font
	;clear even/odd mode
	mov			dx, 03ceh
	mov			ax, 5
	out			dx, ax
	;map VGA memory to 0A0000h
	mov			ax, 0406h
	out			dx, ax
	;set bitplane 2
	mov			dx, 03c4h
	mov			ax, 0402h
	out			dx, ax
	;clear even/odd mode (the other way, don't ask why)
	mov			ax, 0604h
	out			dx, ax
	;copy charmap
	mov			esi, 0A0000h
	mov			ecx, 256
	;copy 16 bytes to bitmap
@@:		movsd
	movsd
	movsd
	movsd
	;skip another 16 bytes
	add			esi, 16
	loop			@@
	;restore VGA state to normal operation
	mov			ax, 0302h
	out			dx, ax
	mov			ax, 0204h
	out			dx, ax
	mov			dx, 03ceh
	mov			ax, 1005h
	out			dx, ax
	mov			ax, 0E06h
	out			dx, ax


_set_fonts_asm:
; NOTE: this code is taken from https://wiki.osdev.org/VGA_Fonts and edited a little bit

    ;in: esi=4k buffer
	;out: buffer filled with font
	;clear even/odd mode
	mov			dx, 03ceh
	mov			ax, 5
	out			dx, ax
	;map VGA memory to 0A0000h
	mov			ax, 0406h
	out			dx, ax
	;set bitplane 2
	mov			dx, 03c4h
	mov			ax, 0402h
	out			dx, ax
	;clear even/odd mode (the other way, don't ask why)
	mov			ax, 0604h
	out			dx, ax
	;copy charmap
	mov			edi, 0A0000h
	mov			ecx, 256
	;copy 16 bytes to bitmap
m:		movsd
	movsd
	movsd
	movsd
	;skip another 16 bytes
	add			esi, 16
	loop			m
	;restore VGA state to normal operation
	mov			ax, 0302h
	out			dx, ax
	mov			ax, 0204h
	out			dx, ax
	mov			dx, 03ceh
	mov			ax, 1005h
	out			dx, ax
	mov			ax, 0E06h
	out			dx, ax