Working version of reading the kernel from the floppy

Makefile

@@ -1,14 +1,19 @@
-default: bootloader.flp
+default: thor.flp
 
 bootloader.bin: src/bootloader/bootloader.asm
 	nasm -f bin -o bootloader.bin src/bootloader/bootloader.asm
 
-bootloader.flp: bootloader.bin
+kernel.bin: src/kernel.asm
-	dd status=noxfer conv=notrunc if=bootloader.bin of=bootloader.flp
+	nasm -f bin -o kernel.bin src/kernel.asm
 
-start: bootloader.flp
+thor.flp: bootloader.bin kernel.bin
-	qemu-kvm -fda bootloader.flp
+	cat bootloader.bin > thor.bin
+	cat kernel.bin >> thor.bin
+	dd status=noxfer conv=notrunc if=thor.bin of=thor.flp
+
+start: thor.flp
+	qemu-kvm -fda thor.flp
 
 clean:
 	rm -f bootloader.bin
-	rm -f bootloader.flp
+	rm -f thor.flp

src/bootloader/bootloader.asm

@@ -1,4 +1,4 @@
-	[BITS 16]
+[BITS 16]
 
 ; Start in real mode
 rm_start:
@@ -6,13 +6,13 @@ rm_start:
 ; 1. Set stable environment
 
     ; Set stack space (4K) and stack segment
-	mov ax, 07C0h
+	mov ax, 0x7C0
 	add ax, 288
 	mov ss, ax
 	mov sp, 4096
 
     ; Set data segment
-	mov ax, 07C0h
+	mov ax, 0x7C0
 	mov ds, ax
 
 ; 2. Welcome the user to the bootloader
@@ -36,10 +36,9 @@ rm_start:
     call new_line
 
     ; Enable A20 gate
-
+    in al, 0x92
-    in 		al, 0x92
+    or al, 2
-    or 		al, 2
+    out 0x92, al
-    out		 0x92, al
 
     ; Wait for any key
     call key_wait
@@ -47,12 +46,48 @@ rm_start:
     mov si, load_kernel
 	call print_line
 
-; 3. Get ready for protected mode
+	BASE equ 0x100       ; 0x0100:0x0 = 0x1000
+	sectors equ 0x20     ; sectors to read
 
-; TODO
+    ; Reset disk drive
+    xor ax, ax
+    xor ah, ah
+    mov dl, 0
+    int 0x13
 
-    ; Infinite loop to not exit directly the system
+    jc reset_failed
-	jmp $
+
+    mov ax, BASE
+    mov es, ax
+    xor bx, bx
+
+    mov ah, 0x2         ; Read sectors from memory
+    mov al, sectors     ; Number of sectors to read
+    xor ch, ch          ; Cylinder 0
+    mov cl, 2           ; Sector 2
+    xor dh, dh          ; Head 0
+    mov dl, [bootdev]   ; Drive
+    int 0x13
+
+    jc read_failed
+
+    jmp dword BASE:0x0
+
+reset_failed:
+    mov si, reset_failed_msg
+    call print_line
+
+    jmp error_end
+
+read_failed:
+    mov si, read_failed_msg
+    call print_line
+
+error_end:
+    mov si, load_failed
+	call print_line
+
+    jmp $
 
 ; Functions
 
@@ -107,6 +142,12 @@ key_wait:
     press_key_msg db 'Press any key to load the kernel...', 0
     load_kernel db 'Attempt to load the kernel...', 0
 
+    reset_failed_msg db 'Reset disk failed', 0
+    read_failed_msg db 'Read disk failed', 0
+    load_failed db 'Kernel loading failed', 0
+
+    bootdev db 0
+
     ; Make a real bootsector
 	times 510-($-$$) db 0
 	dw 0xAA55

src/kernel.asm

@@ -0,0 +1,82 @@
+jmp _start
+
+[BITS 16]
+
+_start:
+    ; Set stack space
+	mov ax, 0x9000
+	mov ss, ax
+	mov sp, 0xffff
+
+    ; Set data segment
+	mov ax, 0x100
+	mov ds, ax
+
+    call new_line
+
+	mov si, kernel_header_0
+	call print_line
+
+    mov si, kernel_header_1
+	call print_line
+
+    mov si, kernel_header_2
+	call print_line
+
+    call new_line
+
+    jmp $
+
+
+; Functions
+
+new_line:
+	mov ah, 0Eh
+
+    mov al, 0Ah
+    int 10h
+
+    mov al, 0Dh
+    int 10h
+
+    ret
+
+print_line:
+	mov ah, 0Eh
+
+.repeat:
+	lodsb
+	cmp al, 0
+	je .done
+	int 10h
+	jmp .repeat
+
+.done:
+    call new_line
+
+    ret
+
+key_wait:
+    mov		al, 0xD2
+    out		64h, al
+
+    mov		al, 0x80
+	out		60h, al
+
+    keyup:
+		in		al, 0x60
+		and	 	al, 10000000b
+	jnz		keyup
+	Keydown:
+	in		al, 0x60
+
+    ret
+
+; Datas
+
+	kernel_header_0 db '******************************', 0
+	kernel_header_1 db 'Welcome to Thor OS!', 0
+	kernel_header_2 db '******************************', 0
+
+    ; Fill the sector
+	times 512-($-$$) db 0