banan-os/kernel/arch/i386/boot.s

39 lines
894 B
ArmAsm

/* Declare constants for the multiboot header. */
.set ALIGN, 1<<0 /* align loaded modules on page boundaries */
.set MEMINFO, 1<<1 /* provide memory map */
.set MB_FLAGS, ALIGN | MEMINFO /* this is the Multiboot 'flag' field */
.set MB_MAGIC, 0x1BADB002 /* 'magic number' lets bootloader find the header */
.set MB_CHECKSUM, -(MB_MAGIC + MB_FLAGS) /* checksum of above, to prove we are multiboot */
/* Multiboot header */
.section .multiboot
.align 4
.long MB_MAGIC
.long MB_FLAGS
.long MB_CHECKSUM
/* Create stack */
.section .bss
.align 16
stack_bottom:
.skip 16384 # 16 KiB
stack_top:
/* Entrypoint */
.section .text
.global _start
.type _start, @function
_start:
/* Setup stack */
mov $stack_top, %esp
/* Call into C code */
call kernel_main
/* Hang if kernel_main returns */
cli
1: hlt
jmp 1b
.size _start, . - _start