Makefile

@@ -13,11 +13,11 @@ kernel-i386.elf: kernel.o start32.o vga.o
 	tcc -m32 -nostdlib -Wl,-Ttext,0x100000 start32.o kernel.o vga.o -o kernel-i386.elf
 
 qemu-multiboot: kernel-i386.elf
-	qemu-system-i386 -kernel kernel-i386.elf -serial stdio
+	qemu-system-i386 -kernel kernel-i386.elf -serial file:CON
 qemu-image: kernel-i386.elf mount
 	cp kernel-i386.elf mnt/
 	sync
-	qemu-system-i386 koalemos.img -serial stdio 
+	qemu-system-i386 koalemos.img
 
 mount: koalemos.img mnt/
 	@if ! mountpoint -q "mnt/"; then \

kernel.c

@@ -1,9 +1,11 @@
 #include "multiboot.h"
 #include "vga.h"
 
-static inline void outb(unsigned short port, unsigned char val) {
+/*
+static inline void outb(unsigned int port, unsigned char val) {
   asm volatile ("outb %0, %1" : : "a"(val), "Nd"(port) : "memory");
 }
+*/
 
 char* itoa(int value, int base) {
     char* result;
@@ -34,8 +36,9 @@ char* itoa(int value, int base) {
 void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) {
 
     // Cursor disabling
-    outb(0x3D4, 0x0A);
-    outb(0x3D5, 0x20);
+    // TODO: outb function
+    //outb(0x3D4, 0x0A);
+    //outb(0x3D5, 0x20);
 
     //cls();
     vga_init(VGA_COLOR_BLACK, VGA_COLOR_GRAY);
@@ -75,4 +78,5 @@ void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) {
     }
 
     vga_write_line("\nExecution finished, halting...");
+    *(unsigned char *)0xb8000 = '!';
 }

start32.asm

@@ -32,10 +32,30 @@ section '.text' executable
 	public  _start
 	extrn   kmain
 
+disable_cursor:
+	pushf
+	push eax
+	push edx
+
+	mov dx, 0x3D4
+	mov al, 0xA	; low cursor shape register
+	out dx, al
+
+	inc dx
+	mov al, 0x20	; bits 6-7 unused, bit 5 disables the cursor, bits 0-4 control the cursor shape
+	out dx, al
+
+	pop edx
+	pop eax
+	popf
+	ret
+
 _start:
 	; Setup stack
 	mov esp, stack_top
 
+	call disable_cursor
+
 	; Call the main kernel function.
 	push ebx
 	push eax

vga.h

@@ -1,5 +1,3 @@
-#ifndef HEADER_VGA
-#define HEADER_VGA
 
 enum vga_color {
 	VGA_COLOR_BLACK = 0,
@@ -20,5 +18,3 @@ void vga_write(const char* text);
 void vga_write_color( const char* text, enum vga_color fg, enum vga_color bg);
 void vga_write_line(const char* text);
 void vga_write_line_color( const char* text, enum vga_color fg, enum vga_color bg);
-
-#endif