mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-22 02:37:15 +00:00
4d846d260e
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
69 lines
2 KiB
C++
69 lines
2 KiB
C++
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2021 The FreeBSD Foundation
|
|
* Copyright (c) 2022 Dmitry Chagin <dchagin@FreeBSD.org>
|
|
*
|
|
* Portions of this software were developed by Konstantin Belousov
|
|
* under sponsorship from the FreeBSD Foundation.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <x86/linux/linux_x86.h>
|
|
|
|
static int
|
|
__vdso_getcpu_rdpid(void)
|
|
{
|
|
register_t res;
|
|
|
|
__asm("rdpid %0" : "=r" (res));
|
|
return ((int)res);
|
|
}
|
|
|
|
static int
|
|
__vdso_getcpu_rdtscp(void)
|
|
{
|
|
int res;
|
|
|
|
__asm("rdtscp" : "=c" (res) : : "eax", "edx");
|
|
return (res);
|
|
}
|
|
|
|
static int
|
|
__vdso_getcpu_try(void)
|
|
{
|
|
int res;
|
|
|
|
switch (kern_cpu_selector) {
|
|
case LINUX_VDSO_CPU_RDTSCP:
|
|
res = __vdso_getcpu_rdtscp();
|
|
break;
|
|
case LINUX_VDSO_CPU_RDPID:
|
|
res = __vdso_getcpu_rdpid();
|
|
break;
|
|
default:
|
|
res = -1;
|
|
}
|
|
return (res);
|
|
}
|