Started working on multistage bootloader. Added VBE data in stage2.asm

src/stage1.asm

@@ -0,0 +1,95 @@
+[bits 16]
+[org 0x7c00]
+[global start]
+
+%define VIDMEM 0xb800
+%define KERNEL_LOC 0x1000
+%define KERNEL_SIZE 20 ; 10kB
+
+start:
+    mov [driveNum], dl   ; Store the drive number
+
+    ; Clear screen
+    mov ax, 0x03
+    int 0x10
+
+    ; Reset disk
+    mov ah, 0x0
+    mov dl, [driveNum]
+    int 0x13
+
+.read:
+    ; Location
+    mov ax, 0 
+    mov es, ax
+    mov bx, 0x7e00 ; 2nd stage bootloader location
+    
+    ; CHS Location
+    mov al, 3   ; Number of sectors to read (2 = 1kB)
+    mov ch, 0   ; Cylinder
+    mov dh, 0   ; Head
+    mov cl, 2   ; Sector
+    mov dl, [driveNum]
+
+    mov ah, 2   ; Read from disk
+    int 0x13    ; Read interrupt
+
+    jnc loadKernel
+
+    dec byte [counter]
+    jnz .read
+
+diskErr:
+    mov si, diskErrMsg
+    mov bl, 0x04
+    mov ax, VIDMEM
+    mov es, ax
+    xor di, di
+.printLoop:
+    movsb
+    mov [es:di], bl
+    inc di
+    cmp byte [si], 0
+    jne .printLoop
+
+    cli
+    hlt
+
+loadKernel:
+    mov byte [counter], 3
+
+.read:
+    ; Location
+    xor ax, ax 
+    mov es, ax
+    mov bx, KERNEL_LOC ; 2nd stage bootloader location
+    
+    ; CHS Location
+    mov al, KERNEL_SIZE
+    mov ch, 0   ; Cylinder
+    mov dh, 0   ; Head
+    mov cl, 6   ; Sector
+    mov dl, [driveNum]
+
+    mov ah, 2   ; Read from disk
+    int 0x13    ; Read interrupt
+    
+    jnc nextStage
+    dec byte [counter]
+    jnz .read
+
+;; Far jump to second stage bootloader
+nextStage:
+    mov dl, [driveNum]
+    jmp 0x0000:0x7e00
+
+;; Data
+driveNum: db 0
+counter: db 3
+
+; Strings
+diskErrMsg: db "Failed while reading from disk!", 0
+
+times 510-($-$$) db 0
+dw 0xaa55
+