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cc65/libsrc/tgi/tgi_ioctl.s

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;
; Ullrich von Bassewitz, 2004-10-14
;
; unsigned __fastcall__ tgi_ioctl (unsigned char code, void* data);
; /* Call the driver specific control function. What this function does for
; ** a specific code depends on the driver. The driver will set an error
; ** for unknown codes or values.
; */
;
.include "tgi-kernel.inc"
.import popa
.importzp ptr1
.proc _tgi_ioctl
sta ptr1
stx ptr1+1 ; Save val
jsr popa ; Retrieve code
jmp tgi_control ; Call the driver
.endproc