MacIIROMDiskDriver/rdtraps.h

#ifndef RDTRAPS_H
#define RDTRAPS_H

#pragma parameter __D0 RDReadXPRAM(__D0, __D1, __A0)
OSErr RDiskReadXPRAM(short numBytes, short whichByte, void *dest) = {0x4840, 0x3001, 0xA051};

// Other definition of RDiskAddDrive with register calling convention
//#pragma parameter __D0 RDiskAddDrive(__D1, __D0, __A0)
//OSErr RDiskAddDrive(short numBytes, short whichByte, void *dest) = {0x4840, 0x3001, 0xA04E};

OSErr RDiskAddDrive(short drvrRefNum, short drvNum, DrvQElPtr dq) {
	__asm__ __volatile__
	(
		"clr.l  %%D0		\n\t"
		"move.w %1,%%D0		\n\t"
		"swap   %%D0		\n\t"
		"move.w %0,%%D0		\n\t"
		"movea.l %2,%%A0	\n\t"
		".word  0xA04E		\n\t"
	: /* outputs */
	: "g"(drvrRefNum), "g"(drvNum), "g"(dq) /* inputs */
	: /* clobbered */);
}

inline char RDiskIsRPressed() { return *((char*)0x175) & 0x80; }
inline char RDiskIsAPressed() { return *((char*)0x174) & 0x01; }

#endif