xref: /freebsd/sys/arm64/include/vfp.h (revision 13464e4a44fc58490a03bb8bfc7e3c972e9c30b2)
1 /*-
2  * Copyright (c) 2015 The FreeBSD Foundation
3  * All rights reserved.
4  *
5  * This software was developed by Andrew Turner under
6  * sponsorship from the FreeBSD Foundation.
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  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * $FreeBSD$
30  */
31 
32 #ifndef _MACHINE_VFP_H_
33 #define	_MACHINE_VFP_H_
34 
35 
36 #ifndef LOCORE
37 struct vfpstate {
38 	__uint128_t	vfp_regs[32];
39 	uint32_t	vfp_fpcr;
40 	uint32_t	vfp_fpsr;
41 };
42 
43 #ifdef _KERNEL
44 struct pcb;
45 
46 void	vfp_init(void);
47 void	vfp_discard(struct thread *);
48 void	vfp_restore_state(void);
49 void	vfp_save_state(struct thread *, struct pcb *);
50 
51 struct fpu_kern_ctx;
52 
53 /*
54  * Flags for fpu_kern_alloc_ctx(), fpu_kern_enter() and fpu_kern_thread().
55  */
56 #define	FPU_KERN_NORMAL	0x0000
57 #define	FPU_KERN_NOWAIT	0x0001
58 #define	FPU_KERN_KTHR	0x0002
59 
60 struct fpu_kern_ctx *fpu_kern_alloc_ctx(u_int);
61 void fpu_kern_free_ctx(struct fpu_kern_ctx *);
62 int fpu_kern_enter(struct thread *, struct fpu_kern_ctx *, u_int);
63 int fpu_kern_leave(struct thread *, struct fpu_kern_ctx *);
64 int fpu_kern_thread(u_int);
65 int is_fpu_kern_thread(u_int);
66 
67 #endif
68 
69 #endif
70 
71 #endif /* !_MACHINE_VFP_H_ */
72