Organizing the kernel code.

kernel/kernel.c

@@ -0,0 +1,10 @@
+void main() {
+	/*
+	 * point to first text cell of the video memory
+	 */
+	char *video_memory = (char*) 0xb8000;
+	/*
+	 * store the character 'X' there
+	 */
+	*video_memory = 'X';
+}

kernel/kernel_entry.asm

@@ -0,0 +1,4 @@
+[bits 32]
+[extern main]       ; reference an external label
+	call main       ; call the main function of our kernel
+	jmp $           ; hang