From 25a24b8b167a7cb28c622039ea30e4afd166cd83 Mon Sep 17 00:00:00 2001 From: Clément Sibille Date: Mon, 4 Oct 2021 13:30:31 +0200 Subject: Make kernel print hello world using the VGA text buffer --- boot/boot.S | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 boot/boot.S (limited to 'boot/boot.S') diff --git a/boot/boot.S b/boot/boot.S new file mode 100644 index 0000000..6164029 --- /dev/null +++ b/boot/boot.S @@ -0,0 +1,36 @@ +MULTIBOOT_ALIGN EQU 1<<0 ; Align loaded modules on page boundaries +MULTIBOOT_MEMINFO EQU 1<<1 ; Provide memory map +MULTIBOOT_FLAGS EQU MULTIBOOT_ALIGN | MULTIBOOT_MEMINFO ; Multiboot flags +MULTIBOOT_MAGIC EQU 0x1BADB002 ; Multiboot 1 magic number +MULTIBOOT_CHECKSUM EQU -(MULTIBOOT_MAGIC + MULTIBOOT_FLAGS) ; Checksum + +SECTION .multiboot +ALIGN 4 +DD MULTIBOOT_MAGIC +DD MULTIBOOT_FLAGS +DD MULTIBOOT_CHECKSUM + +SECTION .bss +ALIGN 16 +stack_bottom: +RESB 16384 ; 16 KiB stack +stack_top: + + +SECTION .text +GLOBAL _start:function (_start.end - _start) +_start: + MOV esp, stack_top + EXTERN kmain + CALL kmain + CLI +.hang: HLT + JMP .hang +.end: + + + + + + + -- cgit v1.2.3