mirror of
https://github.com/freebsd/freebsd-src
synced 2024-10-15 04:43:53 +00:00
31a46e2cc8
libc/<arch>/sys/Makefile.inc -> libsys/<arch>/Makefile.sys. Require that libsys/<arch>/Makefile.sys exist. At least for current archtiectures, it's not possible for an architecture to not have and MD syscall bits. powerpcspe/Makefile.sys's structure means it had to be modified when moved so rename detection won't work, but it has trivial contents so the history is unimportant. Reviewed by: kib, emaste, imp Pull Request: https://github.com/freebsd/freebsd-src/pull/908
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/*-
|
|
* Copyright (c) 2021 The FreeBSD Foundation
|
|
*
|
|
* This software were developed by Konstantin Belousov <kib@FreeBSD.org>
|
|
* 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 <sys/param.h>
|
|
#include <machine/cpufunc.h>
|
|
#include <machine/specialreg.h>
|
|
#include <machine/sysarch.h>
|
|
#include <x86/ifunc.h>
|
|
#include <errno.h>
|
|
#include <sched.h>
|
|
#include "libc_private.h"
|
|
|
|
static int
|
|
sched_getcpu_sys(void)
|
|
{
|
|
return (__sys_sched_getcpu());
|
|
}
|
|
|
|
static int
|
|
sched_getcpu_rdpid(void)
|
|
{
|
|
register_t res;
|
|
|
|
__asm("rdpid %0" : "=r" (res));
|
|
return ((int)res);
|
|
}
|
|
|
|
static int
|
|
sched_getcpu_rdtscp(void)
|
|
{
|
|
int res;
|
|
|
|
__asm("rdtscp" : "=c" (res) : : "eax", "edx");
|
|
return (res);
|
|
}
|
|
|
|
DEFINE_UIFUNC(, int, sched_getcpu, (void))
|
|
{
|
|
u_int amd_feature, cpu_exthigh, p[4];
|
|
|
|
if ((cpu_stdext_feature2 & CPUID_STDEXT2_RDPID) != 0)
|
|
return (sched_getcpu_rdpid);
|
|
|
|
amd_feature = 0;
|
|
if (cpu_feature != 0) {
|
|
do_cpuid(0x80000000, p);
|
|
cpu_exthigh = p[0];
|
|
if (cpu_exthigh >= 0x80000001) {
|
|
do_cpuid(0x80000001, p);
|
|
amd_feature = p[3];
|
|
}
|
|
}
|
|
|
|
return ((amd_feature & AMDID_RDTSCP) == 0 ?
|
|
sched_getcpu_sys : sched_getcpu_rdtscp);
|
|
}
|