port clipper to boot using grub

src/kernel/boot.asm

@@ -0,0 +1,36 @@
+;
+; Bootstrap code for the Clipper operating system
+;
+
+MBALIGN		equ		1 << 0
+MEMINFO 	equ		1 << 1
+FLAGS   	equ 	MBALIGN | MEMINFO
+MAGIC   	equ 	0x1BADB002
+CHECKSUM 	equ		-(MAGIC + FLAGS)
+
+; multiboot header
+section .multiboot
+align 4
+	dd MAGIC
+	dd FLAGS
+	dd CHECKSUM
+
+section .bss
+align 16
+stack_bottom:
+	resb 16384
+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:

src/kernel/kmain.c

@@ -0,0 +1,15 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#if defined(__linux__)
+#	error "Please use a platform agnostic compiler"
+#endif
+
+#if !defined(__i386__)
+#	error "Please use an ix86-elf compiler"
+#endif
+
+void kmain(void) {
+	return;
+}