1 files changed, 61 insertions, 0 deletions
diff --git a/os/cerf405/fpi.h b/os/cerf405/fpi.h
new file mode 100644
index 00000000..dfb9b1df
--- /dev/null
+++ b/os/cerf405/fpi.h
@@ -0,0 +1,61 @@
+typedef long Word;
+typedef unsigned long Single;
+typedef struct {
+	unsigned long h;
+	unsigned long l;
+} Double;
+
+enum {
+	FractBits	= 28,
+	CarryBit	= 0x10000000,
+	HiddenBit	= 0x08000000,
+	MsBit		= HiddenBit,
+	NGuardBits	= 3,
+	GuardMask	= 0x07,
+	LsBit		= (1<<NGuardBits),
+
+	SingleExpBias	= 127,
+	SingleExpMax	= 255,
+	DoubleExpBias	= 1023,
+	DoubleExpMax	= 2047,
+
+	ExpBias		= DoubleExpBias,
+	ExpInfinity	= DoubleExpMax,
+};
+
+typedef struct {
+	unsigned char s;
+	short e;
+	long l;				/* 0000FFFFFFFFFFFFFFFFFFFFFFFFFGGG */
+	long h;				/* 0000HFFFFFFFFFFFFFFFFFFFFFFFFFFF */
+} Internal;
+
+#define IsWeird(n)	((n)->e >= ExpInfinity)
+#define	IsInfinity(n)	(IsWeird(n) && (n)->h == HiddenBit && (n)->l == 0)
+#define	SetInfinity(n)	((n)->e = ExpInfinity, (n)->h = HiddenBit, (n)->l = 0)
+#define IsNaN(n)	(IsWeird(n) && (((n)->h & ~HiddenBit) || (n)->l))
+#define	SetQNaN(n)	((n)->s = 0, (n)->e = ExpInfinity, 		\
+			 (n)->h = HiddenBit|(LsBit<<1), (n)->l = 0)
+#define IsZero(n)	((n)->e == 1 && (n)->h == 0 && (n)->l == 0)
+#define SetZero(n)	((n)->e = 1, (n)->h = 0, (n)->l = 0)
+
+/*
+ * fpi.c
+ */
+extern void fpiround(Internal *);
+extern void fpiadd(Internal *, Internal *, Internal *);
+extern void fpisub(Internal *, Internal *, Internal *);
+extern void fpimul(Internal *, Internal *, Internal *);
+extern void fpidiv(Internal *, Internal *, Internal *);
+extern int fpicmp(Internal *, Internal *);
+extern void fpinormalise(Internal*);
+
+/*
+ * fpimem.c
+ */
+extern void fpis2i(Internal *, void *);
+extern void fpid2i(Internal *, void *);
+extern void fpiw2i(Internal *, void *);
+extern void fpii2s(void *, Internal *);
+extern void fpii2d(void *, Internal *);
+extern void fpii2w(Word *, Internal *);