44 lines
828 B
NASM
44 lines
828 B
NASM
|
; Tutorial: A small kernel with Fasm & TCC
|
||
|
|
; By Tommy.
|
||
|
|
|
||
|
|
format elf
|
||
|
|
use32
|
||
|
|
|
||
|
|
;
|
||
|
|
; Equates
|
||
|
|
;
|
||
|
|
MULTIBOOT_PAGE_ALIGN equ (1 shl 0)
|
||
|
|
MULTIBOOT_MEMORY_INFO equ (1 shl 1)
|
||
|
|
MULTIBOOT_AOUT_KLUDGE equ (1 shl 16)
|
||
|
|
MULTIBOOT_HEADER_MAGIC equ 0x1BADB002
|
||
|
|
MULTIBOOT_HEADER_FLAGS equ MULTIBOOT_PAGE_ALIGN or MULTIBOOT_MEMORY_INFO
|
||
|
|
MULTIBOOT_CHECKSUM equ -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
|
||
|
|
|
||
|
|
|
||
|
|
;
|
||
|
|
; Multiboot header
|
||
|
|
;
|
||
|
|
.multiboot: align 4
|
||
|
|
dd MULTIBOOT_HEADER_MAGIC
|
||
|
|
dd MULTIBOOT_HEADER_FLAGS
|
||
|
|
dd MULTIBOOT_CHECKSUM
|
||
|
|
|
||
|
|
|
||
|
|
section '.bss' writable align 16
|
||
|
|
stack_bottom:
|
||
|
|
rb 16384
|
||
|
|
stack_top:
|
||
|
|
|
||
|
|
section '.text' executable
|
||
|
|
;
|
||
|
|
; Kernel entry point.
|
||
|
|
;
|
||
|
|
public _start
|
||
|
|
extrn kmain
|
||
|
|
_start:
|
||
|
|
; Call the main kernel function.
|
||
|
|
call kmain
|
||
|
|
|
||
|
|
@@:
|
||
|
|
jmp @b
|