cf1c47763f
The flag specifies that the block which uses FPU must be executed in critical section, i.e. take no context switches, and does not need an FPU save area during the execution. It is intended to be applied around fast and short code pathes where save area allocation is impossible or undesirable, due to context or due to the relative cost of calculation vs. allocation. Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)npx.h 5.3 (Berkeley) 1/18/91
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* $FreeBSD$
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*/
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/*
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* Floating Point Data Structures and Constants
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* W. Jolitz 1/90
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*/
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#ifndef _MACHINE_FPU_H_
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#define _MACHINE_FPU_H_
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#include <x86/fpu.h>
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#ifdef _KERNEL
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struct fpu_kern_ctx;
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#define PCB_USER_FPU(pcb) (((pcb)->pcb_flags & PCB_KERNFPU) == 0)
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#define XSAVE_AREA_ALIGN 64
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void fpudna(void);
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void fpudrop(void);
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void fpuexit(struct thread *td);
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int fpuformat(void);
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int fpugetregs(struct thread *td);
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void fpuinit(void);
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void fpurestore(void *addr);
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void fpuresume(void *addr);
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void fpusave(void *addr);
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int fpusetregs(struct thread *td, struct savefpu *addr,
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char *xfpustate, size_t xfpustate_size);
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int fpusetxstate(struct thread *td, char *xfpustate,
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size_t xfpustate_size);
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void fpususpend(void *addr);
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int fputrap_sse(void);
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int fputrap_x87(void);
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void fpuuserinited(struct thread *td);
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struct fpu_kern_ctx *fpu_kern_alloc_ctx(u_int flags);
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void fpu_kern_free_ctx(struct fpu_kern_ctx *ctx);
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int fpu_kern_enter(struct thread *td, struct fpu_kern_ctx *ctx,
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u_int flags);
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int fpu_kern_leave(struct thread *td, struct fpu_kern_ctx *ctx);
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int fpu_kern_thread(u_int flags);
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int is_fpu_kern_thread(u_int flags);
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struct savefpu *fpu_save_area_alloc(void);
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void fpu_save_area_free(struct savefpu *fsa);
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void fpu_save_area_reset(struct savefpu *fsa);
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/*
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* Flags for fpu_kern_alloc_ctx(), fpu_kern_enter() and fpu_kern_thread().
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*/
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#define FPU_KERN_NORMAL 0x0000
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#define FPU_KERN_NOWAIT 0x0001
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#define FPU_KERN_KTHR 0x0002
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#define FPU_KERN_NOCTX 0x0004
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#endif
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#endif /* !_MACHINE_FPU_H_ */
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