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
79struct lwp;
80bool fpu_used_p(struct lwp *);
81void fpu_mark_used(struct lwp *);
82
83void fpu_restore_from_mcontext(struct lwp *, const mcontext_t *);
84bool fpu_save_to_mcontext(struct lwp *, mcontext_t *, unsigned int *);
85
86int fpu_get_fault_code(void);
87
88extern 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
94struct fpreg;
95
96static __inline void
97fpu_load(void)
98{
99 pcu_load(&fpu_ops);
100}
101
102static __inline void
103fpu_save(lwp_t *l)
104{
105 pcu_save(&fpu_ops, l);
106}
107
108static __inline void
109fpu_discard(lwp_t *l)
110{
111 pcu_discard(&fpu_ops, l, false);
112}
113
114void fpu_load_from_fpreg(const struct fpreg *);
115void fpu_unload_to_fpreg(struct fpreg *);
116
117#endif /* PPC_HAVE_FPU */
118#endif /* _KERNEL */
119
120#endif /* _POWERPC_FPU_H_ */