lib/libc/arch/powerpc/misc/powerpc_initfini.c

   1 /*-
   2  * Copyright (c) 2013 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to The NetBSD Foundation
   6  * by Matt Thomas of 3am Software Foundry.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27  * POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31
  32 __RCSID("$NetBSD: powerpc_initfini.c,v 1.1 2013/08/30 21:28:59 matt Exp $");
  33
  34 #include "namespace.h"
  35
  36 /*
  37  * Grab the cache_info at load time.
  38  */
  39
  40 #include <sys/param.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/queue.h>
  43 #include <sys/cpu.h>
  44
  45 #include <stdbool.h>
  46 #include <stddef.h>
  47
  48 __dso_hidden struct cache_info _libc_powerpc_cache_info;
  49
  50 static void _libc_cache_info_init(void)
  51     __attribute__((__constructor__, __used__));
  52
  53 void __section(".text.startup")
  54 _libc_cache_info_init(void)
  55 {
  56         static bool initialized;
  57         if (!initialized) {
  58                 const int name[2] = { CTL_MACHDEP, CPU_CACHEINFO };
  59                 size_t len = sizeof(_libc_powerpc_cache_info);
  60                 (void)sysctl(name, __arraycount(name),
  61                     &_libc_powerpc_cache_info, &len, NULL, 0);
  62                 initialized = 1;
  63         }
  64 }