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/* $OpenBSD: fpu.h,v 1.2 2012/12/04 05:00:40 deraadt Exp $ */
/*
* Copyright (c) 2010 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Layout of the floating-point control/status register (FCR31)
*/
/* flush denormalized results to zero instead of causing FPCSR_C_E */
#define FPCSR_FS 0x01000000
/* compare condition bits: one bit for MIPS I/II/III, eight bits for MIPS IV */
#define FPCSR_CONDBIT(c) ((c) == 0 ? 23 : 24 + (c))
#define FPCSR_CONDVAL(c) (1U << FPCSR_CONDBIT(c))
/* cause bits */
#define FPCSR_C_E 0x00020000 /* unimplemented operation */
#define FPCSR_C_V 0x00010000 /* invalid operation */
#define FPCSR_C_Z 0x00008000 /* division by zero */
#define FPCSR_C_O 0x00004000 /* overflow */
#define FPCSR_C_U 0x00002000 /* underflow */
#define FPCSR_C_I 0x00001000 /* inexact */
/* enable bits */
#define FPCSR_E_V 0x00000800 /* invalid operation */
#define FPCSR_E_Z 0x00000400 /* division by zero */
#define FPCSR_E_O 0x00000200 /* overflow */
#define FPCSR_E_U 0x00000100 /* underflow */
#define FPCSR_E_I 0x00000080 /* inexact */
/* flags bits */
#define FPCSR_F_V 0x00000040 /* invalid operation */
#define FPCSR_F_Z 0x00000020 /* division by zero */
#define FPCSR_F_O 0x00000010 /* overflow */
#define FPCSR_F_U 0x00000008 /* underflow */
#define FPCSR_F_I 0x00000004 /* inexact */
#define FPCSR_C_MASK 0x0003f000
#define FPCSR_C_SHIFT 12
#define FPCSR_E_MASK 0x00000f80
#define FPCSR_E_SHIFT 7
#define FPCSR_F_MASK 0x0000007c
#define FPCSR_F_SHIFT 2
#define FPCSR_RM_MASK 0x00000003 /* rounding mode */
#ifndef _KERNEL
/*
* IRIX-compatible interfaces allowing userland to control the state
* of the floating-point control/status register. These are intended
* to let userland control the state of the FS bit.
*/
#include <sys/cdefs.h>
__BEGIN_DECLS
int get_fpc_csr(void);
int set_fpc_csr(int);
__END_DECLS
#endif /* _KERNEL */
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