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#include	"u.h"
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#include	"../port/lib.h"
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#include	"mem.h"
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#include	"dat.h"
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#include	"fns.h"
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#include	"io.h"
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#include	"ureg.h"
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enum {
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	Ax,
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	Bx,
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	Cx,
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	Dx,
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	/*
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	 * common to intel & amd
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	 */
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	Extfunc	= 0x80000000,
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	Procsig,
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	/* Procsig bits */
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	Dxlongmode	= 1<<29,
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};
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typedef unsigned long long u64intptr;
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static int
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havelongmode(void)
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{
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	ulong regs[4];
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	memset(regs, 0, sizeof regs);
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	cpuid(Extfunc, regs);
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	if(regs[Ax] < Extfunc)
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		return 0;
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	memset(regs, 0, sizeof regs);
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	cpuid(Procsig, regs);
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	return (regs[Dx] & Dxlongmode) != 0;
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}
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void
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warp64(uvlong entry)
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{
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	u64intptr kzero64 = 0xfffffffff0000000ull;
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	extern void _warp64(ulong);
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	print("warp64(%#llux) %#llux %d\n", entry, entry & ~kzero64, nmmap);
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	if(!havelongmode()) {
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		print("can't run 64-bit kernel on 32-bit cpu\n");
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		delay(5000);
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		exit(0);
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	}
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	if(v_flag)
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		print("mkmultiboot\n");
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	mkmultiboot();
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	if(v_flag)
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		print("impulse\n");
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	/*
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	 * No output after impulse().
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	 */
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	if(v_flag)
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		print("_warp64\n");
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	impulse();
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	_warp64(entry & ~kzero64);
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}