8c6f8f3d5b
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
116 lines
3.6 KiB
C
116 lines
3.6 KiB
C
/*-
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* Copyright (c) 1993 The Regents of the University of California.
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* All rights reserved.
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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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* $FreeBSD$
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*/
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/*
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* Architecture specific syscalls (i386)
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*/
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#ifndef _MACHINE_SYSARCH_H_
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#define _MACHINE_SYSARCH_H_
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#define I386_GET_LDT 0
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#define I386_SET_LDT 1
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#define LDT_AUTO_ALLOC 0xffffffff
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/* I386_IOPL */
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#define I386_GET_IOPERM 3
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#define I386_SET_IOPERM 4
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/* xxxxx */
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#define I386_VM86 6
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#define I386_GET_FSBASE 7
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#define I386_SET_FSBASE 8
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#define I386_GET_GSBASE 9
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#define I386_SET_GSBASE 10
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#define I386_GET_XFPUSTATE 11
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/* These four only exist when running an i386 binary on amd64 */
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#define _AMD64_GET_FSBASE 128
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#define _AMD64_SET_FSBASE 129
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#define _AMD64_GET_GSBASE 130
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#define _AMD64_SET_GSBASE 131
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struct i386_ldt_args {
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unsigned int start;
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union descriptor *descs;
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unsigned int num;
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};
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struct i386_ioperm_args {
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unsigned int start;
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unsigned int length;
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int enable;
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};
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struct i386_vm86_args {
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int sub_op; /* sub-operation to perform */
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char *sub_args; /* args */
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};
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struct i386_get_xfpustate {
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void *addr;
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int len;
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};
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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union descriptor;
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struct dbreg;
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__BEGIN_DECLS
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/* These four only exist when running an i386 binary on amd64 */
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int _amd64_get_fsbase(void **);
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int _amd64_get_gsbase(void **);
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int _amd64_set_fsbase(void *);
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int _amd64_set_gsbase(void *);
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int i386_get_ldt(int, union descriptor *, int);
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int i386_set_ldt(int, union descriptor *, int);
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int i386_get_ioperm(unsigned int, unsigned int *, int *);
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int i386_set_ioperm(unsigned int, unsigned int, int);
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int i386_vm86(int, void *);
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int i386_get_fsbase(void **);
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int i386_get_gsbase(void **);
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int i386_set_fsbase(void *);
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int i386_set_gsbase(void *);
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int i386_set_watch(int, unsigned int, int, int, struct dbreg *);
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int i386_clr_watch(int, struct dbreg *);
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int sysarch(int, void *);
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__END_DECLS
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#else
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struct thread;
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union descriptor;
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int i386_get_ldt(struct thread *, struct i386_ldt_args *);
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int i386_set_ldt(struct thread *, struct i386_ldt_args *, union descriptor *);
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int i386_get_ioperm(struct thread *, struct i386_ioperm_args *);
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int i386_set_ioperm(struct thread *, struct i386_ioperm_args *);
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#endif
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#endif /* !_MACHINE_SYSARCH_H_ */
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