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imx8: use generic 9/arm64/sysreg.c

--- a/sys/src/9/imx8/sysreg.c

+++ /dev/null

@@ -1,58 +1,0 @@

-/*

- * ARMv8 system registers

- * mainly to cope with arm hard-wiring register numbers into instructions.

- *

- * these routines must be callable from KZERO.

- *

- * on a multiprocessor, process switching to another cpu is assumed

- * to be inhibited by the caller as these registers are local to the cpu.

- */

-#include "u.h"

-#include "../port/lib.h"

-#include "mem.h"

-#include "dat.h"

-#include "fns.h"

-

-static void*

-mkinstr(ulong wd)

-{

-	static ulong ib[256], *ep[MAXMACH+1];

-	static Lock lk;

-	ulong *ip, *ie;

-

-	ie = ep[m->machno];

-	for(ip = ib; ip < ie; ip += 2)

-		if(*ip == wd)

-			return ip;

-

-	ilock(&lk);

-	ie = ep[MAXMACH];

-	for(; ip < ie; ip += 2)

-		if(*ip == wd)

-			goto Found;

-	if(ip >= &ib[nelem(ib)])

-		panic("mkinstr: out of instrucuction buffer");

-	ip[0] = wd;

-	ip[1] = 0xd65f03c0;	// RETURN

-	ep[MAXMACH] = ie = ip + 2;

-	cachedwbinvse(ip, 2*sizeof(*ip));

-Found:

-	iunlock(&lk);

-	cacheiinv();

-	ep[m->machno] = ie;

-	return ip;

-}

-

-uvlong

-sysrd(ulong spr)

-{

-	uvlong (*fp)(void) = mkinstr(0xd5380000UL | spr);

-	return fp();

-}

-

-void

-syswr(ulong spr, uvlong val)

-{

-	void (*fp)(uvlong) = mkinstr(0xd5180000UL | spr);

-	fp(val);

-}