Home | History | Annotate | Line # | Download | only in include 
      1 /*	$NetBSD: fpu.h,v 1.25 2020/07/15 09:19:49 rin Exp $	*/
      2 
      3 /*-
      4  * Copyright (C) 1996 Wolfgang Solfrank.
      5  * Copyright (C) 1996 TooLs GmbH.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by TooLs GmbH.
     19  * 4. The name of TooLs GmbH may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     28  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     30  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     31  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #ifndef	_POWERPC_FPU_H_
     35 #define	_POWERPC_FPU_H_
     36 
     37 #define	FPSCR_FX	0x80000000	/* Exception Summary */
     38 #define	FPSCR_FEX	0x40000000	/* Enabled Exception Summary */
     39 #define	FPSCR_VX	0x20000000	/* Invalid Operation Exception Summary */
     40 #define	FPSCR_OX	0x10000000	/* Overflow Exception */
     41 #define	FPSCR_UX	0x08000000	/* Undrflow Exception */
     42 #define	FPSCR_ZX	0x04000000	/* Zero Divide Exception */
     43 #define	FPSCR_XX	0x02000000	/* Inexact Exception */
     44 #define	FPSCR_VXSNAN	0x01000000	/* Invalid Op (NAN) */
     45 #define	FPSCR_VXISI	0x00800000	/* Invalid Op (INF-INF) */
     46 #define	FPSCR_VXIDI	0x00400000	/* Invalid Op (INF/INF) */
     47 #define	FPSCR_VXZDZ	0x00200000	/* Invalid Op (0/0) */
     48 #define	FPSCR_VXIMZ	0x00100000	/* Invalid Op (INFx0) */
     49 #define	FPSCR_VXVC	0x00080000	/* Invalid Compare Op */
     50 #define	FPSCR_FR	0x00040000	/* Fraction Rounded */
     51 #define	FPSCR_FI	0x00020000	/* Fraction Inexact */
     52 #define	FPSCR_FPRF	0x0001f000
     53 #define	FPSCR_C		0x00010000	/* FP Class Descriptor */
     54 #define	FPSCR_FPCC	0x0000f000
     55 #define	FPSCR_FL	0x00008000	/* < */
     56 #define	FPSCR_FG	0x00004000	/* > */
     57 #define	FPSCR_FE	0x00002000	/* == */
     58 #define	FPSCR_FU	0x00001000	/* unordered */
     59 #define	FPSCR_VXSOFT	0x00000400	/* Software Invalid Exception */
     60 #define	FPSCR_VXSQRT	0x00000200	/* Invalid Sqrt Exception */
     61 #define	FPSCR_VXCVI	0x00000100	/* Invalid Op Integer Cvt Exception */
     62 #define	FPSCR_VE	0x00000080	/* Invalid Op Exception Enable */
     63 #define	FPSCR_OE	0x00000040	/* Overflow Exception Enable */
     64 #define	FPSCR_UE	0x00000020	/* Underflow Exception Enable */
     65 #define	FPSCR_ZE	0x00000010	/* Zero Divide Exception Enable */
     66 #define	FPSCR_XE	0x00000008	/* Inexact Exception Enable */
     67 #define	FPSCR_NI	0x00000004	/* Non-IEEE Mode Enable */
     68 #define	FPSCR_RN	0x00000003
     69 
     70 #ifdef _KERNEL
     71 
     72 #ifdef _KERNEL_OPT
     73 #include "opt_ppcarch.h"
     74 #endif
     75 
     76 #include <sys/pcu.h>
     77 #include <powerpc/mcontext.h>
     78 
     79 struct lwp;
     80 bool	fpu_used_p(struct lwp *);
     81 void	fpu_mark_used(struct lwp *);
     82 
     83 void	fpu_restore_from_mcontext(struct lwp *, const mcontext_t *);
     84 bool	fpu_save_to_mcontext(struct lwp *, mcontext_t *, unsigned int *);
     85 
     86 int	fpu_get_fault_code(void);
     87 
     88 extern const pcu_ops_t fpu_ops;
     89 
     90 /* List of PowerPC architectures that support FPUs. */
     91 #if defined(PPC_OEA) || defined (PPC_OEA64) || defined (PPC_OEA64_BRIDGE)
     92 #define PPC_HAVE_FPU
     93 
     94 struct fpreg;
     95 
     96 static __inline void
     97 fpu_load(void)
     98 {
     99 	pcu_load(&fpu_ops);
    100 }
    101 
    102 static __inline void
    103 fpu_save(lwp_t *l)
    104 {
    105 	pcu_save(&fpu_ops, l);
    106 }
    107 
    108 static __inline void
    109 fpu_discard(lwp_t *l)
    110 {
    111 	pcu_discard(&fpu_ops, l, false);
    112 }
    113 
    114 void	fpu_load_from_fpreg(const struct fpreg *);
    115 void	fpu_unload_to_fpreg(struct fpreg *);
    116 
    117 #endif /* PPC_HAVE_FPU */
    118 #endif /* _KERNEL */
    119 
    120 #endif	/* _POWERPC_FPU_H_ */
    121