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pc64: update headers to match pc

--- a/sys/src/9/pc64/dat.h

+++ b/sys/src/9/pc64/dat.h

@@ -216,6 +216,9 @@

 	int	cpuiddx;

 	char	cpuidid[16];

 	char*	cpuidtype;

+	uchar	cpuidfamily;

+	uchar	cpuidmodel;

+	uchar	cpuidstepping;

 	int	havetsc;

 	int	havepge;

 	int	havewatchpt8;

--- a/sys/src/9/pc64/main.c

+++ b/sys/src/9/pc64/main.c

@@ -588,7 +588,7 @@

 mathinit(void)

 {

 	trapenable(VectorCERR, matherror, 0, "matherror");

-	if(X86FAMILY(m->cpuidax) == 3)

+	if(m->cpuidfamily == 3)

 		intrenable(IrqIRQ13, matherror, 0, BUSUNKNOWN, "matherror");

 	trapenable(VectorCNA, mathemu, 0, "mathemu");

 	trapenable(VectorCSO, mathover, 0, "mathover");