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Add func "print_str"

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This commit is contained in:
Alex Kotov 2022-01-27 03:43:18 +05:00
parent 3d4fc5625f
commit 169982925d
Signed by: kotovalexarian
GPG key ID: 553C0EBBEB5D5F08
2 changed files with 32 additions and 33 deletions
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3
src/x86_stage1.S
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@ -33,8 +33,7 @@
_start:
ljmp $0, $ADDRESS(start)
disk:
.byte 0
disk: .byte 0
start:
cli

62
src/x86_stage2.S
View file

@ -1,4 +1,5 @@
/*
Copyright (c) 2008-2009 Micah Elizabeth Scott
Copyright (c) 2022 Alex Kotov <kotovalexarian@gmail.com>
This program is free software; you can redistribute it and/or modify
@ -19,43 +20,42 @@
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define ADDRESS(x) (x - _start + 0x7e00)
.code16
.global _start
.section .text
_start:
mov $0x0E, %ah
mov $'H', %al
int $0x10
mov $'e', %al
int $0x10
mov $'l', %al
int $0x10
mov $'l', %al
int $0x10
mov $'o', %al
int $0x10
mov $',', %al
int $0x10
mov $' ', %al
int $0x10
mov $'W', %al
int $0x10
mov $'o', %al
int $0x10
mov $'r', %al
int $0x10
mov $'l', %al
int $0x10
mov $'d', %al
int $0x10
mov $'!', %al
int $0x10
mov $'\r', %al
int $0x10
mov $'\n', %al
int $0x10
ljmp $0, $ADDRESS(start)
hello: .string "Hello, World!\r\n"
start:
mov $ADDRESS(hello), %si
call print_str
mov $ADDRESS(hello), %si
call print_str
mov $ADDRESS(hello), %si
call print_str
hang:
cli
hlt
jmp hang
do_ret:
ret
print_char:
mov $0x0E, %ah
mov $0x0001, %bx
int $0x10
jmp do_ret
print_str:
lodsb
test %al, %al
jz do_ret
call print_char
jmp print_str