824fc46089
support for AVX on i386.
- Similar to amd64, move the FPU save area out of the PCB and instead
store saved FPU state in a variable-sized buffer after the PCB on the
stack.
- To support the variable PCB location, alter the locore code to only use
the bottom-most page of proc0stack for init386(). init386() returns
the correct stack pointer to locore which adjusts the stack for thread0
before calling mi_startup().
- Don't bother setting cr3 in thread0's pcb in locore before calling
init386(). It wasn't used (init386() overwrote it at the end) and
it doesn't work with the variable-sized FPU save area.
- Remove the new-bus attachment from npx. This was only ever useful for
external co-processors using IRQ13, but those have not been supported
for several years. npxinit() is now called much earlier during boot
(init386()) similar to amd64.
- Implement PT_{GET,SET}XSTATE and I386_GET_XFPUSTATE.
- npxsave() is now only called from context switch contexts so it can
use XSAVEOPT.
Differential Revision: https://reviews.freebsd.org/D1058
Reviewed by: kib
Tested on: FreeBSD/i386 VM under bhyve on Intel i5-2520
92 lines
3.1 KiB
C
92 lines
3.1 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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* 287/387 NPX Coprocessor Data Structures and Constants
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* W. Jolitz 1/90
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*/
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#ifndef _MACHINE_NPX_H_
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#define _MACHINE_NPX_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_KERNNPX) == 0)
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#define XSAVE_AREA_ALIGN 64
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int npxdna(void);
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void npxdrop(void);
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void npxexit(struct thread *td);
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int npxformat(void);
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int npxgetregs(struct thread *td);
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void npxinit(bool bsp);
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void npxresume(union savefpu *addr);
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void npxsave(union savefpu *addr);
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int npxsetregs(struct thread *td, union savefpu *addr,
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char *xfpustate, size_t xfpustate_size);
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int npxsetxstate(struct thread *td, char *xfpustate,
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size_t xfpustate_size);
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void npxsuspend(union savefpu *addr);
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int npxtrap_x87(void);
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int npxtrap_sse(void);
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void npxuserinited(struct thread *);
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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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union savefpu *fpu_save_area_alloc(void);
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void fpu_save_area_free(union savefpu *fsa);
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void fpu_save_area_reset(union 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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#endif
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#endif /* !_MACHINE_NPX_H_ */
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