34 lines
754 B
NASM
34 lines
754 B
NASM
/* Declare constants for the multiboot header. */
|
|
.set ALIGN, 1<<0 /* align loaded modules on page boundaries */
|
|
.set MEMINFO, 1<<1 /* provide memory map */
|
|
.set FLAGS, ALIGN | MEMINFO /* this is the Multiboot 'flag' field */
|
|
.set MAGIC, 0x1BADB002 /* 'magic number' lets bootloader find the header */
|
|
.set CHECKSUM, -(MAGIC + FLAGS) /* checksum of above, to prove we are multiboot */
|
|
|
|
.section .multiboot
|
|
.align 4
|
|
.long MAGIC
|
|
.long FLAGS
|
|
.long CHECKSUM
|
|
|
|
.section .bss
|
|
.align 16
|
|
stack_bottom:
|
|
.skip 16384 ; 16 KiB
|
|
stack_top:
|
|
|
|
.section .text
|
|
.global _start
|
|
.type _start, @function
|
|
_start:
|
|
mov $stack_top, %esp
|
|
call kernel_main
|
|
cli
|
|
1: hlt
|
|
jmp 1b
|
|
|
|
_hang:
|
|
hlt
|
|
jmp _hang
|
|
|
|
.size _start, . - _start |