Standard Libraries for EDK II.

This set of three packages: AppPkg, StdLib, StdLibPrivateInternalFiles; contains the implementation of libraries based upon non-UEFI standards such as ISO/IEC-9899, the library portion of the C Language Standard, POSIX, etc.

AppPkg contains applications that make use of the standard libraries defined in the StdLib Package.

StdLib contains header (include) files and the implementations of the standard libraries.

StdLibPrivateInternalFiles contains files for the exclusive use of the library implementations in StdLib.  These files should never be directly referenced from applications or other code.


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11600 6f19259b-4bc3-4df7-8a09-765794883524

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diff --git a/StdLib/Include/sys/ieee754.h b/StdLib/Include/sys/ieee754.h
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+/*	$NetBSD: ieee754.h,v 1.6.24.1 2007/05/07 19:49:10 pavel Exp $	*/

+

+/*

+ * Copyright (c) 1992, 1993

+ *	The Regents of the University of California.  All rights reserved.

+ *

+ * This software was developed by the Computer Systems Engineering group

+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and

+ * contributed to Berkeley.

+ *

+ * 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, Lawrence Berkeley Laboratory.

+ *

+ * 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. 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.

+ *

+ *	@(#)ieee.h	8.1 (Berkeley) 6/11/93

+ */

+#ifndef _SYS_IEEE754_H_

+#define _SYS_IEEE754_H_

+

+/*

+ * NOTICE: This is not a standalone file.  To use it, #include it in

+ * your port's ieee.h header.

+ */

+

+#include <machine/endian.h>

+

+/*

+ * <sys/ieee754.h> defines the layout of IEEE 754 floating point types.

+ * Only single-precision and double-precision types are defined here;

+ * extended types, if available, are defined in the machine-dependent

+ * header.

+ */

+

+/*

+ * Define the number of bits in each fraction and exponent.

+ *

+ *		     k	         k+1

+ * Note that  1.0 x 2  == 0.1 x 2      and that denorms are represented

+ *

+ *					  (-exp_bias+1)

+ * as fractions that look like 0.fffff x 2             .  This means that

+ *

+ *			 -126

+ * the number 0.10000 x 2    , for instance, is the same as the normalized

+ *

+ *		-127			   -128

+ * float 1.0 x 2    .  Thus, to represent 2    , we need one leading zero

+ *

+ *				  -129

+ * in the fraction; to represent 2    , we need two, and so on.  This

+ *

+ *						     (-exp_bias-fracbits+1)

+ * implies that the smallest denormalized number is 2

+ *

+ * for whichever format we are talking about: for single precision, for

+ *

+ *						-126		-149

+ * instance, we get .00000000000000000000001 x 2    , or 1.0 x 2    , and

+ *

+ * -149 == -127 - 23 + 1.

+ */

+#define	SNG_EXPBITS	8

+#define	SNG_FRACBITS	23

+

+struct ieee_single {

+#if _BYTE_ORDER == _BIG_ENDIAN

+	u_int	sng_sign:1;

+	u_int	sng_exp:SNG_EXPBITS;

+	u_int	sng_frac:SNG_FRACBITS;

+#else

+	u_int	sng_frac:SNG_FRACBITS;

+	u_int	sng_exp:SNG_EXPBITS;

+	u_int	sng_sign:1;

+#endif

+};

+

+#define	DBL_EXPBITS	11

+#define	DBL_FRACHBITS	20

+#define	DBL_FRACLBITS	32

+#define	DBL_FRACBITS	(DBL_FRACHBITS + DBL_FRACLBITS)

+

+struct ieee_double {

+#if _BYTE_ORDER == _BIG_ENDIAN

+	u_int	dbl_sign:1;

+	u_int	dbl_exp:DBL_EXPBITS;

+	u_int	dbl_frach:DBL_FRACHBITS;

+	u_int	dbl_fracl:DBL_FRACLBITS;

+#else

+	u_int	dbl_fracl:DBL_FRACLBITS;

+	u_int	dbl_frach:DBL_FRACHBITS;

+	u_int	dbl_exp:DBL_EXPBITS;

+	u_int	dbl_sign:1;

+#endif

+};

+

+/*

+ * Floats whose exponent is in [1..INFNAN) (of whatever type) are

+ * `normal'.  Floats whose exponent is INFNAN are either Inf or NaN.

+ * Floats whose exponent is zero are either zero (iff all fraction

+ * bits are zero) or subnormal values.

+ *

+ * At least one `signalling NaN' and one `quiet NaN' value must be

+ * implemented.  It is left to the architecture to specify how to

+ * distinguish between these.

+ */

+#define	SNG_EXP_INFNAN	255

+#define	DBL_EXP_INFNAN	2047

+

+/*

+ * Exponent biases.

+ */

+#define	SNG_EXP_BIAS	127

+#define	DBL_EXP_BIAS	1023

+

+/*

+ * Convenience data structures.

+ */

+union ieee_single_u {

+	float			sngu_f;

+	struct ieee_single	sngu_sng;

+};

+

+union ieee_double_u {

+	double			dblu_d;

+	struct ieee_double	dblu_dbl;

+};

+#endif /* _SYS_IEEE754_H_ */