fenv for i386, and sparc64; from matthew@

not reviewed yet, but it's better to track changes in cvs

1 files changed, 117 insertions, 0 deletions

diff --git a/sys/arch/i386/include/fenv.h b/sys/arch/i386/include/fenv.h
new file mode 100644
index 00000000000..a756899525d
--- /dev/null
+++ b/sys/arch/i386/include/fenv.h
@@ -0,0 +1,117 @@
+/*	$OpenBSD: fenv.h,v 1.1 2011/04/24 00:35:22 martynas Exp $	*/
+/*	$NetBSD: fenv.h,v 1.1.6.2 2010/10/24 22:48:02 jym Exp $	*/
+/*-
+ * Copyright (c) 2004-2005 David Schultz <das (at) FreeBSD.ORG>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#ifndef	_X86_FENV_H_
+#define	_X86_FENV_H_
+
+#include <sys/stdint.h>
+#include <i386/npx.h>
+
+/*
+ * Each symbol representing a floating point exception expands to an integer
+ * constant expression with values, such that bitwise-inclusive ORs of _all
+ * combinations_ of the constants result in distinct values.
+ *
+ * We use such values that allow direct bitwise operations on FPU/SSE registers.
+ */
+#define	FE_INVALID	0x01	/* 000000000001 */
+#define	FE_DENORMAL	0x02	/* 000000000010 */
+#define	FE_DIVBYZERO	0x04	/* 000000000100 */
+#define	FE_OVERFLOW	0x08	/* 000000001000 */
+#define	FE_UNDERFLOW	0x10	/* 000000010000 */
+#define	FE_INEXACT	0x20	/* 000000100000 */
+
+/*
+ * The following symbol is simply the bitwise-inclusive OR of all floating-point
+ * exception constants defined above.
+ */
+#define FE_ALL_EXCEPT	(FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \
+			 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+
+/*
+ * Each symbol representing the rounding direction, expands to an integer
+ * constant expression whose value is distinct non-negative value.
+ *
+ * We use such values that allow direct bitwise operations on FPU/SSE registers.
+ */
+#define	FE_TONEAREST	0x000	/* 000000000000 */
+#define	FE_DOWNWARD	0x400	/* 010000000000 */
+#define	FE_UPWARD	0x800	/* 100000000000 */
+#define	FE_TOWARDZERO	0xC00	/* 110000000000 */
+
+/*
+ * As compared to the x87 control word, the SSE unit's control has the rounding
+ * control bits offset by 3 and the exception mask bits offset by 7
+ */
+#define	__X87_ROUND_MASK	0xC00		/* 110000000000 */
+#define	__SSE_ROUND_SHIFT	3
+#define	__SSE_EMASK_SHIFT	7
+
+/*
+ * fenv_t represents the entire floating-point environment
+ */
+typedef struct {
+	struct {
+		uint16_t control;	/* Control word register */
+		uint16_t unused1;
+		uint16_t status;	/* Status word register */
+		uint16_t unused2;
+		uint16_t tag;		/* Tag word register */
+		uint16_t unused3;
+		uint32_t others[4];	/* EIP, Pointer Selector, etc */
+	} x87;
+		
+	uint32_t mxcsr;			/* Control and status register */
+} fenv_t;
+
+/*
+ * The following constant represents the default floating-point environment
+ * (that is, the one installed at program startup) and has type pointer to
+ * const-qualified fenv_t.
+ *
+ * It can be used as an argument to the functions within the <fenv.h> header
+ * that manage the floating-point environment.
+ */
+extern  fenv_t		__fe_dfl_env;
+#define FE_DFL_ENV      ((const fenv_t *) &__fe_dfl_env)
+
+/*
+ * fexcept_t represents the floating-point status flags collectively, including
+ * any status the implementation associates with the flags.
+ *
+ * A floating-point status flag is a system variable whose value is set (but
+ * never cleared) when a floating-point exception is raised, which occurs as a
+ * side effect of exceptional floating-point arithmetic to provide auxiliary
+ * information.
+ *
+ * A floating-point control mode is a system variable whose value may be set by
+ * the user to affect the subsequent behavior of floating-point arithmetic.
+ */
+typedef uint32_t fexcept_t;
+
+#endif	/* ! _X86_FENV_H_ */