1993-06-12 14:58:17 +00:00
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/*-
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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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1993-10-16 14:40:57 +00:00
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* from: @(#)npx.h 5.3 (Berkeley) 1/18/91
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1999-08-28 01:08:13 +00:00
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* $FreeBSD$
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1993-06-12 14:58:17 +00:00
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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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1994-11-05 22:59:09 +00:00
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#ifndef _MACHINE_NPX_H_
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#define _MACHINE_NPX_H_
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1993-06-12 14:58:17 +00:00
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2012-03-16 20:24:30 +00:00
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#include <x86/fpu.h>
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1993-06-12 14:58:17 +00:00
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1999-12-29 04:46:21 +00:00
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#ifdef _KERNEL
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2005-05-12 12:47:41 +00:00
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2010-06-05 15:59:59 +00:00
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#define PCB_USER_FPU(pcb) (((pcb)->pcb_flags & PCB_KERNNPX) == 0)
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2002-03-20 05:48:58 +00:00
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int npxdna(void);
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2002-09-16 19:25:41 +00:00
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void npxdrop(void);
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2002-03-20 05:48:58 +00:00
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void npxexit(struct thread *td);
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2002-09-16 19:25:41 +00:00
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int npxformat(void);
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2010-11-26 14:50:42 +00:00
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int npxgetregs(struct thread *td);
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2009-03-05 18:32:43 +00:00
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void npxinit(void);
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2002-03-20 05:48:58 +00:00
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void npxsave(union savefpu *addr);
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2002-09-16 19:25:41 +00:00
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void npxsetregs(struct thread *td, union savefpu *addr);
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2012-07-21 21:52:48 +00:00
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int npxtrap_x87(void);
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int npxtrap_sse(void);
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2010-11-26 14:50:42 +00:00
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void npxuserinited(struct thread *);
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Add support for the extended FPU states on amd64, both for native
64bit and 32bit ABIs. As a side-effect, it enables AVX on capable
CPUs.
In particular:
- Query the CPU support for XSAVE, list of the supported extensions
and the required size of FPU save area. The hw.use_xsave tunable is
provided for disabling XSAVE, and hw.xsave_mask may be used to
select the enabled extensions.
- Remove the FPU save area from PCB and dynamically allocate the
(run-time sized) user save area on the top of the kernel stack,
right above the PCB. Reorganize the thread0 PCB initialization to
postpone it after BSP is queried for save area size.
- The dumppcb, stoppcbs and susppcbs now do not carry the FPU state as
well. FPU state is only useful for suspend, where it is saved in
dynamically allocated suspfpusave area.
- Use XSAVE and XRSTOR to save/restore FPU state, if supported and
enabled.
- Define new mcontext_t flag _MC_HASFPXSTATE, indicating that
mcontext_t has a valid pointer to out-of-struct extended FPU
state. Signal handlers are supplied with stack-allocated fpu
state. The sigreturn(2) and setcontext(2) syscall honour the flag,
allowing the signal handlers to inspect and manipilate extended
state in the interrupted context.
- The getcontext(2) never returns extended state, since there is no
place in the fixed-sized mcontext_t to place variable-sized save
area. And, since mcontext_t is embedded into ucontext_t, makes it
impossible to fix in a reasonable way. Instead of extending
getcontext(2) syscall, provide a sysarch(2) facility to query
extended FPU state.
- Add ptrace(2) support for getting and setting extended state; while
there, implement missed PT_I386_{GET,SET}XMMREGS for 32bit binaries.
- Change fpu_kern KPI to not expose struct fpu_kern_ctx layout to
consumers, making it opaque. Internally, struct fpu_kern_ctx now
contains a space for the extended state. Convert in-kernel consumers
of fpu_kern KPI both on i386 and amd64.
First version of the support for AVX was submitted by Tim Bird
<tim.bird am sony com> on behalf of Sony. This version was written
from scratch.
Tested by: pho (previous version), Yamagi Burmeister <lists yamagi org>
MFC after: 1 month
2012-01-21 17:45:27 +00:00
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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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2010-06-05 15:59:59 +00:00
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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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/*
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* Flags for fpu_kern_enter() and fpu_kern_thread().
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*/
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#define FPU_KERN_NORMAL 0x0000
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Add support for the extended FPU states on amd64, both for native
64bit and 32bit ABIs. As a side-effect, it enables AVX on capable
CPUs.
In particular:
- Query the CPU support for XSAVE, list of the supported extensions
and the required size of FPU save area. The hw.use_xsave tunable is
provided for disabling XSAVE, and hw.xsave_mask may be used to
select the enabled extensions.
- Remove the FPU save area from PCB and dynamically allocate the
(run-time sized) user save area on the top of the kernel stack,
right above the PCB. Reorganize the thread0 PCB initialization to
postpone it after BSP is queried for save area size.
- The dumppcb, stoppcbs and susppcbs now do not carry the FPU state as
well. FPU state is only useful for suspend, where it is saved in
dynamically allocated suspfpusave area.
- Use XSAVE and XRSTOR to save/restore FPU state, if supported and
enabled.
- Define new mcontext_t flag _MC_HASFPXSTATE, indicating that
mcontext_t has a valid pointer to out-of-struct extended FPU
state. Signal handlers are supplied with stack-allocated fpu
state. The sigreturn(2) and setcontext(2) syscall honour the flag,
allowing the signal handlers to inspect and manipilate extended
state in the interrupted context.
- The getcontext(2) never returns extended state, since there is no
place in the fixed-sized mcontext_t to place variable-sized save
area. And, since mcontext_t is embedded into ucontext_t, makes it
impossible to fix in a reasonable way. Instead of extending
getcontext(2) syscall, provide a sysarch(2) facility to query
extended FPU state.
- Add ptrace(2) support for getting and setting extended state; while
there, implement missed PT_I386_{GET,SET}XMMREGS for 32bit binaries.
- Change fpu_kern KPI to not expose struct fpu_kern_ctx layout to
consumers, making it opaque. Internally, struct fpu_kern_ctx now
contains a space for the extended state. Convert in-kernel consumers
of fpu_kern KPI both on i386 and amd64.
First version of the support for AVX was submitted by Tim Bird
<tim.bird am sony com> on behalf of Sony. This version was written
from scratch.
Tested by: pho (previous version), Yamagi Burmeister <lists yamagi org>
MFC after: 1 month
2012-01-21 17:45:27 +00:00
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#define FPU_KERN_NOWAIT 0x0001
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2006-05-28 02:03:13 +00:00
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1994-11-05 22:59:09 +00:00
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#endif
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#endif /* !_MACHINE_NPX_H_ */
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