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

51 lines
914 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 VIDEOINFO, 1<<2 # provide video info
.set MB_FLAGS, ALIGN | MEMINFO | VIDEOINFO # 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
.skip 4
.skip 4
.skip 4
.skip 4
.skip 4
.long 0
.long 800
.long 600
.long 32
# Create stack
.section .bss
stack_bottom:
.skip 16384 # 16 KiB
stack_top:
.section .text
.global _start
.type _start, @function
_start:
movl $stack_top, %esp
pushl %eax
pushl %ebx
call _init
call kernel_main
cli
1:
hlt
jmp 1b
.size _start, . - _start