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cc65/libsrc/serial/ser_ioctl.s

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;
; Oliver Schmidt, 2005-09-02
;
; unsigned char __fastcall__ ser_ioctl (unsigned char code, void* data);
; /* Driver specific entry. */
.import popa
.importzp ptr1
.include "ser-kernel.inc"
.proc _ser_ioctl
sta ptr1
stx ptr1+1 ; Save pointer to data
jsr popa ; Get code
jmp ser_ioctl ; Call the driver
.endproc