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On x86 Linux via AT_HWCAP2 the user controlled (by tunables) processor capabilities are exposed. Reviewed by: Differential Revision: https://reviews.freebsd.org/D41165 MFC after: 2 weeks
48 lines
1.9 KiB
C
48 lines
1.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Dmitry Chagin <dchagin@FreeBSD.org>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#ifndef _X86_INCLUDE_LINUX_LINUX_X86_H_
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#define _X86_INCLUDE_LINUX_LINUX_X86_H_
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#define LINUX_VDSO_CPU_DEFAULT 0
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#define LINUX_VDSO_CPU_RDPID 1
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#define LINUX_VDSO_CPU_RDTSCP 2
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/* More machine dependent hints about processor capabilities. */
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#define LINUX_HWCAP2_RING3MWAIT 0x00000001
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#define LINUX_HWCAP2_FSGSBASE 0x00000002
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int linux_vdso_tsc_selector_idx(void);
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int linux_vdso_cpu_selector_idx(void);
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int linux_translate_traps(int, int);
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int bsd_to_linux_trapcode(int);
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u_int linux_x86_elf_hwcap2(void);
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#endif /* _X86_INCLUDE_LINUX_LINUX_X86_H_ */
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