34 lines
733 B
ArmAsm
34 lines
733 B
ArmAsm
|
/* https://github.com/cirosantilli/x86-bare-metal-examples#no-bios-hello-world */
|
||
|
|
|
||
|
|
#include "common.h"
|
||
|
|
|
||
|
|
BEGIN
|
||
|
|
mov $0xB800, %di
|
||
|
|
mov %di, %es
|
||
|
|
xor %di, %di
|
||
|
|
lea msg, %si
|
||
|
|
/* clear screen from SeaBIOS messages */
|
||
|
|
xor %ax, %ax
|
||
|
|
movw $2000, %cx
|
||
|
|
repz stosw
|
||
|
|
xor %di, %di
|
||
|
|
/* write a string on the screen */
|
||
|
|
.loop:
|
||
|
|
lodsb
|
||
|
|
test %al, %al
|
||
|
|
jz .halt
|
||
|
|
/* write the character */
|
||
|
|
movb %al, %es:(%di)
|
||
|
|
/* write color attribute of this character
|
||
|
|
* 20d = 0x14 = 10100b = color attributes (red on blue)
|
||
|
|
* background color = 1b = blue
|
||
|
|
* foreground color = 100b = red
|
||
|
|
*/
|
||
|
|
movb $20, %es:1(%di)
|
||
|
|
add $0x2, %di
|
||
|
|
jmp .loop
|
||
|
|
.halt:
|
||
|
|
hlt
|
||
|
|
msg:
|
||
|
|
.asciz "hello world"
|