Some file restructuring

src/lib/print.asm

@@ -0,0 +1,89 @@
+;
+; Prints a string
+; si - Pointer to NULL terminated string
+;
+print:
+    pusha
+    mov ah, 0x0e
+    mov bl, 0x0f
+    mov bh, 0
+.loop:
+    lodsb           ; Load [si] into al; Increment si
+    or al, al
+    jz .done
+    int 0x10
+    jmp .loop
+.done:
+    popa
+    ret
+
+;
+; Prints a hex value
+; dx - Value to print in Hex
+;
+printHex:
+    pusha
+    xor cx, cx      ; Init counter
+.loop:
+    cmp cx, 4       ; Check for loop end
+    je .done
+    mov ax, dx      ; Copy dx to ax
+    and ax, 0x000f  ; Get last nibble (4 bits) of ax
+    add ax, '0'     ; Convert number to an ASCII number (0-9)
+    cmp ax, '9'     ; Check if number was less than 9, meaning we can use it
+    jle .addChar
+    add ax, 0x07    ; Convert to letter (A-F)
+.addChar:
+    mov bx, hexString + 5
+    sub bx, cx      ; Get position of current hex character
+    mov [bx], al
+    ror dx, 4       ; Rotate bits of dx (0x1a2b -> 0xb1a2)
+    inc cx          ; Increment the counter
+    jmp .loop
+.done: 
+    mov si, hexString
+    call print
+    popa
+    ret
+
+;
+; Prints a hex byte
+; dl - Hex byte
+;
+printHexByte:
+    pusha
+    xor cx, cx
+.loop:
+    mov al, dl
+    and al, 0xF0
+    ror al, 4
+    add al, '0'
+    cmp al, '9'
+    jle .hexNum
+    add al, 7
+.hexNum:
+    mov ah, 0x0e
+    int 0x10
+    inc cx
+    cmp cx, 2
+    je .done
+    ror dl, 4
+    jmp .loop
+.done:
+    popa
+    ret
+
+hexString: db "0x0000", 0
+
+;
+; Clears the screen
+;
+clear:
+    pusha
+    ; TODO: Make this function
+    popa
+    ret
+
+; Usefull definitions
+%define ENDL 0x0a, 0x0d
+newline: db ENDL, 0 ; CRLF

src/lib/screen.asm

@@ -0,0 +1,24 @@
+resetTextMode: 
+    pusha
+
+    mov ah, 0       ; Set mode
+    mov al, 0x03    ; 25x80, Text mode
+    int 0x10
+
+    mov ah, 0x0b    ; Change color/palette
+    mov bh, 0x00    ; Change BG color
+    mov bl, 0x01    ; Blue BG
+    int 0x10
+
+    popa
+    ret
+
+resetGraphicsMode:
+    pusha
+
+    mov ah, 0       ; Set mode
+    mov al, 0x13    ; 320x200, 256 color graphics mode
+    int 0x10
+
+    popa
+    ret