linux_vdso_getcpu_x86.inc

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2021 The FreeBSD Foundation
    5  * Copyright (c) 2022 Dmitry Chagin <dchagin@FreeBSD.org>
    6  *
    7  * Portions of this software were developed by Konstantin Belousov
    8  * under sponsorship from the FreeBSD Foundation.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <x86/linux/linux_x86.h>
   33 
   34 static int
   35 __vdso_getcpu_rdpid(void)
   36 {
   37         register_t res;
   38 
   39         __asm("rdpid    %0" : "=r" (res));
   40         return ((int)res);
   41 }
   42 
   43 static int
   44 __vdso_getcpu_rdtscp(void)
   45 {
   46         int res;
   47 
   48         __asm("rdtscp" : "=c" (res) : : "eax", "edx");
   49         return (res);
   50 }
   51 
   52 static int
   53 __vdso_getcpu_try(void)
   54 {
   55         int res;
   56 
   57         switch (kern_cpu_selector) {
   58         case LINUX_VDSO_CPU_RDTSCP:
   59                 res = __vdso_getcpu_rdtscp();
   60                 break;
   61         case LINUX_VDSO_CPU_RDPID:
   62                 res = __vdso_getcpu_rdpid();
   63                 break;
   64         default:
   65                 res = -1;
   66         }
   67         return (res);
   68 }

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sys/x86/linux/linux_vdso_getcpu_x86.inc