1 files changed, 109 insertions, 0 deletions
diff --git a/sys/amd64/include/floatingpoint.h b/sys/amd64/include/floatingpoint.h
new file mode 100644
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+++ b/sys/amd64/include/floatingpoint.h
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+/*-
+ * Copyright (c) 1993 Andrew Moore, Talke Studio
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	from: @(#) floatingpoint.h	1.0 (Berkeley) 9/23/93
+ *	$Id: floatingpoint.h,v 1.4 1993/11/07 17:42:55 wollman Exp $
+ */
+
+/*
+ *	IEEE floating point structure and function definitions
+ */
+
+#ifndef _FLOATINGPOINT_H_
+#define _FLOATINGPOINT_H_
+
+#include <sys/cdefs.h>
+#include <machine/ieeefp.h>
+
+#ifdef __GNUC__
+
+#ifdef __i386__
+
+#define fnstcw(addr)	__asm("fnstcw %0" : "=m" (*addr) : "0" (*addr))
+#define fnstsw(addr)	__asm("fnstsw %0" : "=m" (*addr) : "0" (*addr))
+#define fnstenv(addr)	__asm("fnstenv %0" : "=m" (*addr) : "0" (*addr))
+#define fldenv(addr)	__asm("fldenv %0" : : "m" (*addr))
+
+
+/*
+ * return the contents of a FP register
+ */
+static __inline__ int
+__fpgetreg(int _reg)
+{
+	unsigned short _mem;
+
+	switch(_reg) {
+	default:
+		fnstcw(&_mem);
+		break;
+	case FP_STKY_REG:
+		fnstsw(&_mem);
+		break;
+	}
+	return _mem;
+}
+
+/*
+ * set a FP mode; return previous mode
+ */
+static __inline__ int
+__fpsetreg(int _m, int _reg, int _fld, int _off)
+{
+	unsigned _env[7];
+	unsigned _p;
+
+	fnstenv(_env);
+	_p =  (_env[_reg] & _fld) >> _off;
+	_env[_reg] = (_env[_reg] & ~_fld) | (_m << _off & _fld);
+	fldenv(_env);
+	return _p;
+}
+
+#endif /* __i386__ */
+
+#endif /* __GNUC__ */
+
+/*
+ * SysV/386 FP control interface
+ */
+#define fpgetround()	((__fpgetreg(FP_RND_REG) & FP_RND_FLD) >> FP_RND_OFF)
+#define fpsetround(m)	__fpsetreg((m), FP_RND_REG, FP_RND_FLD, FP_RND_OFF)
+#define fpgetprec()	((__fpgetreg(FP_PRC_REG) & FP_PRC_FLD) >> FP_PRC_OFF)
+#define fpsetprec(m)	__fpsetreg((m), FP_PRC_REG, FP_PRC_FLD, FP_PRC_OFF)
+#define fpgetmask()	((~__fpgetreg(FP_MSKS_REG) & FP_MSKS_FLD) >> FP_MSKS_OFF)
+#define fpsetmask(m)	__fpsetreg(~(m), FP_MSKS_REG, FP_MSKS_FLD, FP_MSKS_OFF)
+#define fpgetsticky()	((__fpgetreg(FP_STKY_REG) & FP_STKY_FLD) >> FP_STKY_OFF)
+#define fpresetsticky(m)	__fpsetreg(0, FP_STKY_REG, (m), FP_STKY_OFF)
+#define fpsetsticky(m)	fpresetsticky(m)
+
+#endif /* !_FLOATINGPOINT_H_ */