osfmk/kern/ipc_clock.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  *      File:           kern/ipc_clock.c
  33  *      Purpose:        Routines to support ipc semantics of new kernel
  34  *                      alarm clock facility.
  35  */
  36
  37 #include <mach/message.h>
  38 #include <kern/host.h>
  39 #include <kern/processor.h>
  40 #include <kern/task.h>
  41 #include <kern/thread.h>
  42 #include <kern/ipc_host.h>
  43 #include <kern/ipc_kobject.h>
  44 #include <kern/clock.h>
  45 #include <kern/misc_protos.h>
  46 #include <ipc/ipc_port.h>
  47 #include <ipc/ipc_space.h>
  48
  49 /*
  50  *      Routine:        ipc_clock_init
  51  *      Purpose:
  52  *              Initialize ipc control of a clock.
  53  */
  54 void
  55 ipc_clock_init(
  56         clock_t         clock)
  57 {
  58         ipc_port_t      port;
  59
  60         port = ipc_port_alloc_kernel();
  61         if (port == IP_NULL) {
  62                 panic("ipc_clock_init");
  63         }
  64         clock->cl_service = port;
  65
  66         port = ipc_port_alloc_kernel();
  67         if (port == IP_NULL) {
  68                 panic("ipc_clock_init");
  69         }
  70         clock->cl_control = port;
  71 }
  72
  73 /*
  74  *      Routine:        ipc_clock_enable
  75  *      Purpose:
  76  *              Enable ipc access to a clock.
  77  */
  78 void
  79 ipc_clock_enable(
  80         clock_t         clock)
  81 {
  82         ipc_kobject_set(clock->cl_service,
  83             (ipc_kobject_t) clock, IKOT_CLOCK);
  84         ipc_kobject_set(clock->cl_control,
  85             (ipc_kobject_t) clock, IKOT_CLOCK_CTRL);
  86 }
  87
  88 /*
  89  *      Routine:        convert_port_to_clock
  90  *      Purpose:
  91  *              Convert from a port to a clock.
  92  *              Doesn't consume the port ref; produces a clock ref,
  93  *              which may be null.
  94  *      Conditions:
  95  *              Nothing locked.
  96  */
  97 clock_t
  98 convert_port_to_clock(
  99         ipc_port_t      port)
 100 {
 101         clock_t         clock = CLOCK_NULL;
 102
 103         if (IP_VALID(port)) {
 104                 ip_lock(port);
 105                 if (ip_active(port) &&
 106                     ((ip_kotype(port) == IKOT_CLOCK) ||
 107                     (ip_kotype(port) == IKOT_CLOCK_CTRL))) {
 108                         clock = (clock_t) port->ip_kobject;
 109                 }
 110                 ip_unlock(port);
 111         }
 112         return clock;
 113 }
 114
 115 /*
 116  *      Routine:        convert_port_to_clock_ctrl
 117  *      Purpose:
 118  *              Convert from a port to a clock.
 119  *              Doesn't consume the port ref; produces a clock ref,
 120  *              which may be null.
 121  *      Conditions:
 122  *              Nothing locked.
 123  */
 124 clock_t
 125 convert_port_to_clock_ctrl(
 126         ipc_port_t      port)
 127 {
 128         clock_t         clock = CLOCK_NULL;
 129
 130         if (IP_VALID(port)) {
 131                 ip_lock(port);
 132                 if (ip_active(port) &&
 133                     (ip_kotype(port) == IKOT_CLOCK_CTRL)) {
 134                         clock = (clock_t) port->ip_kobject;
 135                 }
 136                 ip_unlock(port);
 137         }
 138         return clock;
 139 }
 140
 141 /*
 142  *      Routine:        convert_clock_to_port
 143  *      Purpose:
 144  *              Convert from a clock to a port.
 145  *              Produces a naked send right which may be invalid.
 146  *      Conditions:
 147  *              Nothing locked.
 148  */
 149 ipc_port_t
 150 convert_clock_to_port(
 151         clock_t         clock)
 152 {
 153         ipc_port_t      port;
 154
 155         port = ipc_port_make_send(clock->cl_service);
 156         return port;
 157 }
 158
 159 /*
 160  *      Routine:        convert_clock_ctrl_to_port
 161  *      Purpose:
 162  *              Convert from a clock to a port.
 163  *              Produces a naked send right which may be invalid.
 164  *      Conditions:
 165  *              Nothing locked.
 166  */
 167 ipc_port_t
 168 convert_clock_ctrl_to_port(
 169         clock_t         clock)
 170 {
 171         ipc_port_t      port;
 172
 173         port = ipc_port_make_send(clock->cl_control);
 174         return port;
 175 }
 176
 177 /*
 178  *      Routine:        port_name_to_clock
 179  *      Purpose:
 180  *              Convert from a clock name to a clock pointer.
 181  */
 182 clock_t
 183 port_name_to_clock(
 184         mach_port_name_t clock_name)
 185 {
 186         clock_t         clock = CLOCK_NULL;
 187         ipc_space_t     space;
 188         ipc_port_t      port;
 189
 190         if (clock_name == 0) {
 191                 return clock;
 192         }
 193         space = current_space();
 194         if (ipc_port_translate_send(space, clock_name, &port) != KERN_SUCCESS) {
 195                 return clock;
 196         }
 197         if (ip_kotype(port) == IKOT_CLOCK) {
 198                 clock = (clock_t) port->ip_kobject;
 199         }
 200         ip_unlock(port);
 201         return clock;
 202 }