patch-2.2.18 linux/arch/m68k/math-emu/fp_emu.h

• Lines: 138
• Date: Fri Oct 13 23:36:54 2000
• Orig file: v2.2.17/arch/m68k/math-emu/fp_emu.h
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/arch/m68k/math-emu/fp_emu.h linux/arch/m68k/math-emu/fp_emu.h
@@ -0,0 +1,137 @@
+/*
+ * fp_emu.h
+ *
+ * Copyright Roman Zippel, 1997.  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, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 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. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``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 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 _FP_EMU_H
+#define _FP_EMU_H
+
+#ifndef __ASSEMBLY__
+
+#include <asm/math-emu.h>
+
+#define IS_INF(a) ((a)->exp == 0x7fff)
+#define IS_ZERO(a) ((a)->mant.m64 == 0)
+
+
+#define fp_set_sr(bit) ({					\
+	FPDATA->fpsr |= 1 << (bit);				\
+})
+
+#define fp_set_quotient(quotient) ({				\
+	FPDATA->fpsr &= 0xff00ffff;				\
+	FPDATA->fpsr |= ((quotient) & 0xff) << 16;		\
+})
+
+/* linkage for several useful functions */
+
+/* Normalize the extended struct, return 0 for a NaN */
+#define fp_normalize_ext(fpreg) ({				\
+	register struct fp_ext *reg asm ("a0") = fpreg;		\
+	register int res asm ("d0");				\
+								\
+	asm volatile ("jsr fp_conv_ext2ext"			\
+			: "=d" (res) : "a" (reg)		\
+			: "a1", "d1", "d2", "memory");		\
+	res;							\
+})
+
+#define fp_copy_ext(dest, src) ({				\
+	*dest = *src;						\
+})
+
+#define fp_monadic_check(dest, src) ({				\
+	fp_copy_ext(dest, src);					\
+	if (!fp_normalize_ext(dest))				\
+		return dest;					\
+})
+
+#define fp_dyadic_check(dest, src) ({				\
+	if (!fp_normalize_ext(dest))				\
+		return dest;					\
+	if (!fp_normalize_ext(src)) {				\
+		fp_copy_ext(dest, src);				\
+		return dest;					\
+	}							\
+})
+
+extern const struct fp_ext fp_QNaN;
+extern const struct fp_ext fp_Inf;
+
+#define fp_set_nan(dest) ({					\
+	fp_set_sr(FPSR_EXC_OPERR);				\
+	*dest = fp_QNaN;					\
+})
+
+/* TODO check rounding mode? */
+#define fp_set_ovrflw(dest) ({					\
+	fp_set_sr(FPSR_EXC_OVFL);				\
+	dest->exp = 0x7fff;					\
+	dest->mant.m64 = 0;					\
+})
+
+#define fp_conv_ext2long(src) ({				\
+	register struct fp_ext *__src asm ("a0") = src;		\
+	register int __res asm ("d0");				\
+								\
+	asm volatile ("jsr fp_conv_ext2long"			\
+			: "=d" (__res) : "a" (__src)		\
+			: "a1", "d1", "d2", "memory");		\
+	__res;							\
+})
+
+#else /* __ASSEMBLY__ */
+
+#include "../kernel/m68k_defs.h"
+#include <asm/math-emu.h>
+
+/*
+ * set, reset or clear a bit in the fp status register
+ */
+.macro	fp_set_sr	bit
+	bset	#(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
+.endm
+
+.macro	fp_clr_sr	bit
+	bclr	#(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
+.endm
+
+.macro	fp_tst_sr	bit
+	btst	#(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
+.endm
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _FP_EMU_H */