patch-1.3.50 linux/include/asm-alpha/fpu.h

• Lines: 65
• Date: Fri Dec 22 08:22:06 1995
• Orig file: v1.3.49/linux/include/asm-alpha/fpu.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.49/linux/include/asm-alpha/fpu.h linux/include/asm-alpha/fpu.h
@@ -0,0 +1,64 @@
+#ifndef __ASM_ALPHA_FPU_H
+#define __ASM_ALPHA_FPU_H
+
+/*
+ * Alpha floating-point control register defines:
+ */
+#define FPCR_INVD	(1UL<<49)	/* invalid op disable (opt.) */
+#define FPCR_DZED	(1UL<<50)	/* division by zero disable (opt.) */
+#define FPCR_OVFD	(1UL<<51)	/* overflow disable (optional) */
+#define FPCR_INV	(1UL<<52)	/* invalid operation */
+#define FPCR_DZE	(1UL<<53)	/* division by zero */
+#define FPCR_OVF	(1UL<<54)	/* overflow */
+#define FPCR_UNF	(1UL<<55)	/* underflow */
+#define FPCR_INE	(1UL<<56)	/* inexact */
+#define FPCR_IOV	(1UL<<57)	/* integer overflow */
+#define FPCR_UNDZ	(1UL<<60)	/* underflow to zero (opt.) */
+#define FPCR_UNFD	(1UL<<61)	/* underflow disable (opt.) */
+#define FPCR_INED	(1UL<<62)	/* inexact disable (opt.) */
+#define FPCR_SUM	(1UL<<63)	/* summary bit */
+
+#define FPCR_DYN_SHIFT	58		/* first dynamic rounding mode bit */
+#define FPCR_DYN_CHOPPED (0x0UL << FPCR_DYN_SHIFT)	/* towards 0 */
+#define FPCR_DYN_MINUS	 (0x1UL << FPCR_DYN_SHIFT)	/* towards -INF */
+#define FPCR_DYN_NORMAL	 (0x2UL << FPCR_DYN_SHIFT)	/* towards nearest */
+#define FPCR_DYN_PLUS	 (0x3UL << FPCR_DYN_SHIFT)	/* towards +INF */
+#define FPCR_DYN_MASK	 (0x3UL << FPCR_DYN_SHIFT)
+
+#define FPCR_MASK	0xfffe000000000000
+
+/*
+ * IEEE trap enables are implemented in software.  These per-thread
+ * bits are stored in the "flags" field of "struct thread_struct".
+ * Thus, the bits are defined so as not to conflict with the
+ * floating-point enable bit (which is architected).  On top of that,
+ * we want to make these bits compatible with OSF/1 so
+ * ieee_set_fp_control() etc. can be implemented easily and
+ * compatibly.  The corresponding definitions are in
+ * /usr/include/machine/fpu.h under OSF/1.
+ */
+#define IEEE_TRAP_ENABLE_INV	(1<<1)	/* invalid op */
+#define IEEE_TRAP_ENABLE_DZE	(1<<2)	/* division by zero */
+#define IEEE_TRAP_ENABLE_OVF	(1<<3)	/* overflow */
+#define IEEE_TRAP_ENABLE_UNF	(1<<4)	/* underflow */
+#define IEEE_TRAP_ENABLE_INE	(1<<5)	/* inexact */
+#define IEEE_TRAP_ENABLE_MASK	(IEEE_TRAP_ENABLE_INV | IEEE_TRAP_ENABLE_DZE |\
+				 IEEE_TRAP_ENABLE_OVF | IEEE_TRAP_ENABLE_UNF |\
+				 IEEE_TRAP_ENABLE_INE)
+
+/* status bits coming from fpcr: */
+#define IEEE_STATUS_INV		(1<<17)
+#define IEEE_STATUS_DZE		(1<<18)
+#define IEEE_STATUS_OVF		(1<<19)
+#define IEEE_STATUS_UNF		(1<<20)
+#define IEEE_STATUS_INE		(1<<21)
+
+#define IEEE_STATUS_MASK	(IEEE_STATUS_INV | IEEE_STATUS_DZE |	\
+				 IEEE_STATUS_OVF | IEEE_STATUS_UNF |	\
+				 IEEE_STATUS_INE)
+
+#define IEEE_STATUS_TO_EXCSUM_SHIFT	16
+
+#define IEEE_INHERIT    (1UL<<63)	/* inherit on thread create? */
+
+#endif /* __ASM_ALPHA_FPU_H */