Added support for \n, \t and \\ in the string printing function

source/kernel/features/math.asm

@@ -0,0 +1,53 @@
+; LBA = index of data segment on disk
+; CHS = cylinder, header, sector
+; T = LBA/sectors per track
+; S = (LBA%sectors per track) + 1
+; H = T % heads
+; C = T / headers
+; input, LBA index: ax
+; sector number: cl
+; cylinder: ch
+; head: dh
+; Example where LBA = 50h (CHS = 2,0,9)
+; ax = 0050h, push this to the stack
+; dx = 0000h
+; dx = 50h % 12h = 0008h
+; ax = 50h / 12h = 0004h
+; dx = 0009h
+; cx = 0009h
+; dx = 0000h
+; dx = 04h % 02h = 0000h
+; ax = 04h / 02h = 0002h
+; dh = 00h (dx = 0000h)
+; ch = 02h (cx = 0209h)
+; ah = 00h (ax = 0002h)
+; cl = 09h OR 00h = 09h (cx = 0209h)
+; ax = 0050h
+; dl = 50h (dx = 0050h)
+; ax = 0050h
+; thus:
+; cylinder (ch) = 02h
+; head (cl) = 00h
+; sector (dh) = 09h
+os_lba_to_chs:
+    push ax
+    push dx
+
+    xor dx,dx ; clear dx
+    div word [bdb_sectors_per_track] ; (LBA % sectors per track) + 1 = sector
+    inc dx  ; sector, dx stores the remainder so we increment that.
+    mov cx,dx
+
+    xor dx,dx ; clear dx
+    div word [bdb_number_of_heads]
+    mov dh,dl ; head, dx stores remainder so we move that up 8 bits to dh
+
+    mov ch,al
+    shl ah, 6   ; * 32
+    or cl, ah   ; cylinder
+
+    pop ax
+    mov dl,al
+    pop ax
+
+    ret