fox32rom: Move enable_cursor to a separate subroutine

cursor.asm

@@ -0,0 +1,35 @@
+; mouse cursor routines
+
+enable_cursor:
+    push r0
+    push r1
+    push r31
+
+    ; write the cursor bitmap to the overlay framebuffer
+    mov r0, CURSOR_FRAMEBUFFER_PTR
+    mov r1, mouse_cursor
+    mov r31, 96 ; 8x12
+enable_cursor_loop:
+    mov [r0], [r1]
+    add r0, 4
+    add r1, 4
+    loop enable_cursor_loop
+
+    ; set properties of overlay 31
+    mov r0, 0x8000011F ; overlay 31: size
+    mov.16 r1, CURSOR_HEIGHT
+    sla r1, 16
+    mov.16 r1, CURSOR_WIDTH
+    out r0, r1
+    mov r0, 0x8000021F ; overlay 31: framebuffer pointer
+    mov r1, CURSOR_FRAMEBUFFER_PTR
+    out r0, r1
+
+    ; enable overlay 31 (cursor)
+    mov r0, 0x8000031F
+    out r0, 1
+
+    pop r31
+    pop r1
+    pop r0
+    ret

main.asm

@@ -34,30 +34,7 @@ disable_all_overlays_loop:
     inc r0
     out r0, 0
 
-    ; write the cursor bitmap to the overlay framebuffer
-    mov r0, CURSOR_FRAMEBUFFER_PTR
-    mov r1, mouse_cursor
-    mov r31, 96 ; 8x12
-cursor_overlay_loop:
-    mov [r0], [r1]
-    add r0, 4
-    add r1, 4
-    loop cursor_overlay_loop
-
-cursor_enable:
-    ; set properties of overlay 31
-    mov r0, 0x8000011F ; overlay 31: size
-    mov.16 r1, CURSOR_HEIGHT
-    sla r1, 16
-    mov.16 r1, CURSOR_WIDTH
-    out r0, r1
-    mov r0, 0x8000021F ; overlay 31: framebuffer pointer
-    mov r1, CURSOR_FRAMEBUFFER_PTR
-    out r0, r1
-
-    ; enable overlay 31 (cursor)
-    mov r0, 0x8000031F
-    out r0, 1
+    call enable_cursor
 
     mov r0, BACKGROUND_COLOR
     call fill_background
@@ -140,6 +117,7 @@ get_rom_version:
     ; code
     #include "background.asm"
     #include "boot.asm"
+    #include "cursor.asm"
     #include "debug.asm"
     #include "disk.asm"
     #include "draw_pixel.asm"