fox32rom/cursor.asm

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; 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