tests/modules/k_uvm/k_uvm.c

   1 /*      $NetBSD: k_uvm.c,v 1.1 2012/02/17 22:36:50 jmmv Exp $   */
   2 /*
   3  * Copyright (c) 2012 The NetBSD Foundation, Inc.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
  16  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  17  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  22  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  24  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  25  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  26  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __KERNEL_RCSID(0, "$NetBSD: k_uvm.c,v 1.1 2012/02/17 22:36:50 jmmv Exp $");
  31
  32 #include <sys/param.h>
  33 #include <sys/kernel.h>
  34 #include <sys/module.h>
  35 #include <sys/sysctl.h>
  36
  37 MODULE(MODULE_CLASS_MISC, k_uvm, NULL);
  38
  39 /* --------------------------------------------------------------------- */
  40 /* Sysctl interface to query information about the module.               */
  41 /* --------------------------------------------------------------------- */
  42
  43 static struct sysctllog *clogp;
  44 static int page_size;
  45
  46 #define K_UVM 0x12345678
  47 #define K_UVM_VALUE 0
  48
  49 SYSCTL_SETUP(sysctl_k_uvm_setup, "sysctl k_uvm subtree setup")
  50 {
  51
  52         sysctl_createv(clog, 0, NULL, NULL,
  53                        CTLFLAG_PERMANENT,
  54                        CTLTYPE_NODE, "k_uvm", NULL,
  55                        NULL, 0, NULL, 0,
  56                        CTL_VENDOR, K_UVM, CTL_EOL);
  57
  58         sysctl_createv(clog, 0, NULL, NULL,
  59                        CTLFLAG_PERMANENT,
  60                        CTLTYPE_INT, "page_size",
  61                        SYSCTL_DESCR("Value of PAGE_SIZE"),
  62                        NULL, 0, &page_size, 0,
  63                        CTL_VENDOR, K_UVM, K_UVM_VALUE, CTL_EOL);
  64 }
  65
  66 /* --------------------------------------------------------------------- */
  67 /* Module management.                                                    */
  68 /* --------------------------------------------------------------------- */
  69
  70 static
  71 int
  72 k_uvm_init(prop_dictionary_t props)
  73 {
  74
  75         page_size = PAGE_SIZE;
  76
  77         sysctl_k_uvm_setup(&clogp);
  78
  79         return 0;
  80 }
  81
  82 static
  83 int
  84 k_uvm_fini(void *arg)
  85 {
  86
  87         sysctl_teardown(&clogp);
  88
  89         return 0;
  90 }
  91
  92 static
  93 int
  94 k_uvm_modcmd(modcmd_t cmd, void *arg)
  95 {
  96         int ret;
  97
  98         switch (cmd) {
  99         case MODULE_CMD_INIT:
 100                 ret = k_uvm_init(arg);
 101                 break;
 102
 103         case MODULE_CMD_FINI:
 104                 ret = k_uvm_fini(arg);
 105                 break;
 106
 107         case MODULE_CMD_STAT:
 108         default:
 109                 ret = ENOTTY;
 110         }
 111
 112         return ret;
 113 }