Start migrating from floppy to hard disk

Move stage1 into the MBR boot code
Move stage2 into the second sector of the hard disk

Makefile

@@ -15,6 +15,8 @@ bootloader/bootloader.bin: force_look sectors
 	cd bootloader; $(MAKE)
 
 thor.flp: bootloader/bootloader.bin
+	dd if=bootloader/stage1.bin of=hdd.img bs=446 count=1 conv=notrunc
+	dd if=bootloader/stage2.bin of=hdd.img bs=512 count=1 seek=1 conv=notrunc
 	cat bootloader/bootloader.bin > thor.bin
 	cat kernel/kernel.bin >> thor.bin
 	cat filler.bin >> thor.bin

bochsrc.txt

@@ -1,5 +1,4 @@
 display_library: sdl
 magic_break: enabled=1
-floppya: 1_44=thor.flp, status=inserted
 ata0-master: type=disk, path="hdd.img", mode=flat, cylinders=1000, heads=16, spt=63
-boot:floppy
+boot: disk

bootloader/Makefile

@@ -11,13 +11,13 @@ stage1.bin: stage1.asm
 stage2.bin: stage2.asm sectors.asm
 	nasm -w+all -f bin -o stage2.bin stage2.asm
 
-padding.bin:
+#padding.bin:
-	dd if=/dev/zero of=padding.bin bs=512 count=34
+#	dd if=/dev/zero of=padding.bin bs=512 count=34
 
-bootloader.bin: stage1.bin stage2.bin padding.bin
+bootloader.bin: stage1.bin stage2.bin
 	cat stage1.bin > bootloader.bin
 	cat stage2.bin >> bootloader.bin
-	cat padding.bin >> bootloader.bin
+#	cat padding.bin >> bootloader.bin
 
 clean:
 	rm -f stage1.bin

bootloader/intel_16.asm

@@ -48,6 +48,49 @@ print_16:
 .done:
     ret
 
+print_int_16:
+    push ax
+    push bx
+    push dx
+    push si
+
+    mov ax, di
+
+    xor si, si
+
+    .loop:
+        xor dx, dx
+        mov bx, 10
+        div bx
+        add dx, 48
+
+        push dx
+        inc si
+
+        test ax, ax
+        jne .loop
+
+    .next:
+        test si, si
+        je .exit
+        dec si
+
+        ; write the char
+        pop ax
+
+        mov ah, 0Eh
+        int 10h
+
+        jmp .next
+
+    .exit:
+        pop si
+        pop dx
+        pop bx
+        pop ax
+
+        ret
+
 key_wait:
     mov al, 0xD2
     out 64h, al

bootloader/stage1.asm

@@ -19,6 +19,10 @@ rm_start:
     mov ss, ax
     mov sp, 4096
 
+    ; Used for disk access
+    xor ax, ax
+    mov gs, ax
+
     ; Set data segment
     mov ax, 0x7C0
     mov ds, ax
@@ -62,6 +66,12 @@ rm_start:
 
     jc extensions_not_supported
 
+    ; Tests
+
+    ; This is the partition start
+;    mov di, [gs:(0x1000 + 446 + 8)]
+;    call print_int_16
+
     ; 3. Wait for a key press
 
     call new_line_16
@@ -78,36 +88,15 @@ rm_start:
     mov si, load_msg
     call print_line_16
 
-    ; Reset disk drive
+    ; Loading the stage 2 from disk
-    xor ax, ax
-    xor ah, ah
-    mov dl, 0
-    int 0x13
 
-    jc reset_failed
+    mov ah, 0x42
-
+    mov si, DAP
-    ; Loading the stage 2 from floppy
+    mov dl, 0x80
-
-    bootdev equ 0x0
-    sectors equ 1
-
-    mov ax, 0x90
-    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
 
-    cmp al, sectors
-    jne read_failed
-
     ; Run the stage 2
 
     jmp dword 0x90:0x0
@@ -134,7 +123,18 @@ error_end:
 
     jmp $
 
-; Datas
+; Variable Datas
+
+DAP:
+.size       db 0x10
+.null       db 0x0
+.count      dw 1
+.offset     dw 0
+.segment    dw 0x90
+.lba        dd 1
+.lba48      dd 0
+
+; Constants Datas
 
     header_1 db 'Welcome to Thor OS Bootloader!', 0
 
@@ -148,5 +148,4 @@ error_end:
 
 ; Make a real bootsector
 
-    times 510-($-$$) db 0
+    times 446-($-$$) db 0
-    dw 0xAA55

bootloader/stage2.asm

@@ -24,6 +24,8 @@ second_step:
     mov si, load_kernel
     call print_line_16
 
+    jmp $
+
     ; Reset disk drive
     xor ax, ax
     mov dl, bootdev