osfmk/ipc/ipc_kmsg.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52 /*
  53  *      File:   ipc/ipc_kmsg.h
  54  *      Author: Rich Draves
  55  *      Date:   1989
  56  *
  57  *      Definitions for kernel messages.
  58  */
  59
  60 #ifndef _IPC_IPC_KMSG_H_
  61 #define _IPC_IPC_KMSG_H_
  62
  63 #include <cpus.h>
  64
  65 #include <mach/vm_types.h>
  66 #include <mach/message.h>
  67 #include <kern/assert.h>
  68 #include <kern/cpu_number.h>
  69 #include <kern/macro_help.h>
  70 #include <kern/kalloc.h>
  71 #include <ipc/ipc_object.h>
  72
  73 /*
  74  *      This structure is only the header for a kmsg buffer;
  75  *      the actual buffer is normally larger.  The rest of the buffer
  76  *      holds the body of the message.
  77  *
  78  *      In a kmsg, the port fields hold pointers to ports instead
  79  *      of port names.  These pointers hold references.
  80  *
  81  *      The ikm_header.msgh_remote_port field is the destination
  82  *      of the message.
  83  */
  84
  85
  86 typedef struct ipc_kmsg {
  87         struct ipc_kmsg *ikm_next;
  88         struct ipc_kmsg *ikm_prev;
  89         ipc_port_t ikm_prealloc;        /* port we were preallocated from */
  90         mach_msg_size_t ikm_size;
  91         mach_msg_header_t ikm_header;
  92 } *ipc_kmsg_t;
  93
  94 #define IKM_NULL                ((ipc_kmsg_t) 0)
  95
  96 #define IKM_OVERHEAD                                                    \
  97                 (sizeof(struct ipc_kmsg) - sizeof(mach_msg_header_t))
  98
  99 #define ikm_plus_overhead(size) ((mach_msg_size_t)((size) + IKM_OVERHEAD))
 100 #define ikm_less_overhead(size) ((mach_msg_size_t)((size) - IKM_OVERHEAD))
 101
 102 /*
 103  * XXX  For debugging.
 104  */
 105 #define IKM_BOGUS               ((ipc_kmsg_t) 0xffffff10)
 106
 107 /*
 108  *      The size of the kernel message buffers that will be cached.
 109  *      IKM_SAVED_KMSG_SIZE includes overhead; IKM_SAVED_MSG_SIZE doesn't.
 110  */
 111
 112 #define IKM_SAVED_MSG_SIZE      ikm_less_overhead(256)
 113
 114 #define ikm_prealloc_inuse_port(kmsg)                                   \
 115         ((kmsg)->ikm_prealloc)
 116
 117 #define ikm_prealloc_inuse(kmsg)                                        \
 118         ((kmsg)->ikm_prealloc != IP_NULL)
 119
 120 #define ikm_prealloc_set_inuse(kmsg, port)                              \
 121 MACRO_BEGIN                                                             \
 122         assert((port) != IP_NULL);                                      \
 123         (kmsg)->ikm_prealloc = (port);                                  \
 124         ip_reference(port);                                             \
 125 MACRO_END
 126
 127 #define ikm_prealloc_clear_inuse(kmsg, port)                            \
 128 MACRO_BEGIN                                                             \
 129         (kmsg)->ikm_prealloc = IP_NULL;                                 \
 130         ip_release(port);                                               \
 131 MACRO_END
 132
 133
 134 #define ikm_init(kmsg, size)                                            \
 135 MACRO_BEGIN                                                             \
 136         (kmsg)->ikm_size = (size);                                      \
 137         (kmsg)->ikm_prealloc = IP_NULL;                                 \
 138         assert((kmsg)->ikm_prev = (kmsg)->ikm_next = IKM_BOGUS);        \
 139 MACRO_END
 140
 141 #define ikm_check_init(kmsg, size)                                      \
 142 MACRO_BEGIN                                                             \
 143         assert((kmsg)->ikm_size == (size));                             \
 144         assert((kmsg)->ikm_prev == IKM_BOGUS);                          \
 145         assert((kmsg)->ikm_next == IKM_BOGUS);                          \
 146 MACRO_END
 147
 148 struct ipc_kmsg_queue {
 149         struct ipc_kmsg *ikmq_base;
 150 };
 151
 152 typedef struct ipc_kmsg_queue *ipc_kmsg_queue_t;
 153
 154 #define IKMQ_NULL               ((ipc_kmsg_queue_t) 0)
 155
 156
 157 /*
 158  * Exported interfaces
 159  */
 160
 161 #define ipc_kmsg_queue_init(queue)              \
 162 MACRO_BEGIN                                     \
 163         (queue)->ikmq_base = IKM_NULL;          \
 164 MACRO_END
 165
 166 #define ipc_kmsg_queue_empty(queue)     ((queue)->ikmq_base == IKM_NULL)
 167
 168 /* Enqueue a kmsg */
 169 extern void ipc_kmsg_enqueue(
 170         ipc_kmsg_queue_t        queue,
 171         ipc_kmsg_t              kmsg);
 172
 173 /* Dequeue and return a kmsg */
 174 extern ipc_kmsg_t ipc_kmsg_dequeue(
 175         ipc_kmsg_queue_t        queue);
 176
 177 /* Pull a kmsg out of a queue */
 178 extern void ipc_kmsg_rmqueue(
 179         ipc_kmsg_queue_t        queue,
 180         ipc_kmsg_t              kmsg);
 181
 182 #define ipc_kmsg_queue_first(queue)             ((queue)->ikmq_base)
 183
 184 /* Return the kmsg following the given kmsg */
 185 extern ipc_kmsg_t ipc_kmsg_queue_next(
 186         ipc_kmsg_queue_t        queue,
 187         ipc_kmsg_t              kmsg);
 188
 189 #define ipc_kmsg_rmqueue_first_macro(queue, kmsg)                       \
 190 MACRO_BEGIN                                                             \
 191         register ipc_kmsg_t _next;                                      \
 192                                                                         \
 193         assert((queue)->ikmq_base == (kmsg));                           \
 194                                                                         \
 195         _next = (kmsg)->ikm_next;                                       \
 196         if (_next == (kmsg)) {                                          \
 197                 assert((kmsg)->ikm_prev == (kmsg));                     \
 198                 (queue)->ikmq_base = IKM_NULL;                          \
 199         } else {                                                        \
 200                 register ipc_kmsg_t _prev = (kmsg)->ikm_prev;           \
 201                                                                         \
 202                 (queue)->ikmq_base = _next;                             \
 203                 _next->ikm_prev = _prev;                                \
 204                 _prev->ikm_next = _next;                                \
 205         }                                                               \
 206         /* XXX Debug paranoia ASSIGNMENTS */                            \
 207         assert(kmsg->ikm_next = IKM_BOGUS);                             \
 208         assert(kmsg->ikm_prev = IKM_BOGUS);                             \
 209 MACRO_END
 210
 211 #define ipc_kmsg_enqueue_macro(queue, kmsg)                             \
 212 MACRO_BEGIN                                                             \
 213         register ipc_kmsg_t _first = (queue)->ikmq_base;                \
 214                                                                         \
 215         if (_first == IKM_NULL) {                                       \
 216                 (queue)->ikmq_base = (kmsg);                            \
 217                 (kmsg)->ikm_next = (kmsg);                              \
 218                 (kmsg)->ikm_prev = (kmsg);                              \
 219         } else {                                                        \
 220                 register ipc_kmsg_t _last = _first->ikm_prev;           \
 221                                                                         \
 222                 (kmsg)->ikm_next = _first;                              \
 223                 (kmsg)->ikm_prev = _last;                               \
 224                 _first->ikm_prev = (kmsg);                              \
 225                 _last->ikm_next = (kmsg);                               \
 226         }                                                               \
 227 MACRO_END
 228
 229 /* scatter list macros */
 230
 231 #define SKIP_PORT_DESCRIPTORS(s, e)                                     \
 232 MACRO_BEGIN                                                             \
 233         if ((s) != MACH_MSG_DESCRIPTOR_NULL) {                          \
 234                 while ((s) < (e)) {                                     \
 235                         if ((s)->type.type != MACH_MSG_PORT_DESCRIPTOR) \
 236                                 break;                                  \
 237                         (s)++;                                          \
 238                 }                                                       \
 239                 if ((s) >= (e))                                         \
 240                         (s) = MACH_MSG_DESCRIPTOR_NULL;                 \
 241         }                                                               \
 242 MACRO_END
 243
 244 #define INCREMENT_SCATTER(s)                                            \
 245 MACRO_BEGIN                                                             \
 246         if ((s) != MACH_MSG_DESCRIPTOR_NULL) {                          \
 247                 (s)++;                                                  \
 248         }                                                               \
 249 MACRO_END
 250
 251 /*
 252  *      extern void
 253  *      ipc_kmsg_send_always(ipc_kmsg_t);
 254  *
 255  *      Unfortunately, to avoid warnings/lint about unused variables
 256  *      when assertions are turned off, we need two versions of this.
 257  */
 258 #if     MACH_ASSERT
 259
 260 #define ipc_kmsg_send_always(kmsg)                                      \
 261 MACRO_BEGIN                                                             \
 262         mach_msg_return_t mr;                                           \
 263                                                                         \
 264         mr = ipc_kmsg_send((kmsg), MACH_SEND_ALWAYS,                    \
 265                              MACH_MSG_TIMEOUT_NONE);                    \
 266         assert(mr == MACH_MSG_SUCCESS);                                 \
 267 MACRO_END
 268
 269 #else   /* MACH_ASSERT */
 270
 271 #define ipc_kmsg_send_always(kmsg)                                      \
 272 MACRO_BEGIN                                                             \
 273         (void) ipc_kmsg_send((kmsg), MACH_SEND_ALWAYS,                  \
 274                                MACH_MSG_TIMEOUT_NONE);                  \
 275 MACRO_END
 276
 277 #endif  /* MACH_ASSERT */
 278
 279 /* Allocate a kernel message */
 280 extern ipc_kmsg_t ipc_kmsg_alloc(
 281         mach_msg_size_t size);
 282
 283 /* Free a kernel message buffer */
 284 extern void ipc_kmsg_free(
 285         ipc_kmsg_t      kmsg);
 286
 287 /* Destroy kernel message */
 288 extern void ipc_kmsg_destroy(
 289         ipc_kmsg_t      kmsg);
 290
 291 /* Preallocate a kernel message buffer */
 292 extern void ipc_kmsg_set_prealloc(
 293         ipc_kmsg_t      kmsg,
 294         ipc_port_t      port);
 295
 296 /* Clear a kernel message buffer */
 297 extern void ipc_kmsg_clear_prealloc(
 298         ipc_kmsg_t      kmsg,
 299         ipc_port_t      port);
 300
 301 /* Allocate a kernel message buffer and copy a user message to the buffer */
 302 extern mach_msg_return_t ipc_kmsg_get(
 303         mach_msg_header_t       *msg,
 304         mach_msg_size_t         size,
 305         ipc_kmsg_t              *kmsgp);
 306
 307 /* Allocate a kernel message buffer and copy a kernel message to the buffer */
 308 extern mach_msg_return_t ipc_kmsg_get_from_kernel(
 309         mach_msg_header_t       *msg,
 310         mach_msg_size_t         size,
 311         ipc_kmsg_t              *kmsgp);
 312
 313 /* Send a message to a port */
 314 extern mach_msg_return_t ipc_kmsg_send(
 315         ipc_kmsg_t              kmsg,
 316         mach_msg_option_t       option,
 317         mach_msg_timeout_t      timeout);
 318
 319 /* Copy a kernel message buffer to a user message */
 320 extern mach_msg_return_t ipc_kmsg_put(
 321         mach_msg_header_t       *msg,
 322         ipc_kmsg_t              kmsg,
 323         mach_msg_size_t         size);
 324
 325 /* Copy a kernel message buffer to a kernel message */
 326 extern void ipc_kmsg_put_to_kernel(
 327         mach_msg_header_t       *msg,
 328         ipc_kmsg_t              kmsg,
 329         mach_msg_size_t         size);
 330
 331 /* Copyin port rights in the header of a message */
 332 extern mach_msg_return_t ipc_kmsg_copyin_header(
 333         mach_msg_header_t       *msg,
 334         ipc_space_t             space,
 335         mach_port_name_t        notify);
 336
 337 /* Copyin port rights and out-of-line memory from a user message */
 338 extern mach_msg_return_t ipc_kmsg_copyin(
 339         ipc_kmsg_t              kmsg,
 340         ipc_space_t             space,
 341         vm_map_t                map,
 342         mach_port_name_t        notify);
 343
 344 /* Copyin port rights and out-of-line memory from a kernel message */
 345 extern void ipc_kmsg_copyin_from_kernel(
 346         ipc_kmsg_t              kmsg);
 347
 348 /* Copyout port rights in the header of a message */
 349 extern mach_msg_return_t ipc_kmsg_copyout_header(
 350         mach_msg_header_t       *msg,
 351         ipc_space_t             space,
 352         mach_port_name_t        notify);
 353
 354 /* Copyout a port right returning a name */
 355 extern mach_msg_return_t ipc_kmsg_copyout_object(
 356         ipc_space_t             space,
 357         ipc_object_t            object,
 358         mach_msg_type_name_t    msgt_name,
 359         mach_port_name_t        *namep);
 360
 361 /* Copyout the header and body to a user message */
 362 extern mach_msg_return_t ipc_kmsg_copyout(
 363         ipc_kmsg_t              kmsg,
 364         ipc_space_t             space,
 365         vm_map_t                map,
 366         mach_port_name_t        notify,
 367         mach_msg_body_t         *slist);
 368
 369 /* Copyout port rights and out-of-line memory from the body of a message */
 370 extern mach_msg_return_t ipc_kmsg_copyout_body(
 371         ipc_kmsg_t              kmsg,
 372         ipc_space_t             space,
 373         vm_map_t                map,
 374         mach_msg_body_t         *slist);
 375
 376 /* Copyout port rights and out-of-line memory to a user message,
 377    not reversing the ports in the header */
 378 extern mach_msg_return_t ipc_kmsg_copyout_pseudo(
 379         ipc_kmsg_t              kmsg,
 380         ipc_space_t             space,
 381         vm_map_t                map,
 382         mach_msg_body_t         *slist);
 383
 384 /* Copyout the destination port in the message */
 385 extern void ipc_kmsg_copyout_dest(
 386         ipc_kmsg_t              kmsg,
 387         ipc_space_t             space);
 388
 389 /* kernel's version of ipc_kmsg_copyout_dest */
 390 extern void ipc_kmsg_copyout_to_kernel(
 391         ipc_kmsg_t              kmsg,
 392         ipc_space_t             space);
 393
 394 /* copyin a scatter list and check consistency */
 395 extern mach_msg_body_t *ipc_kmsg_copyin_scatter(
 396         mach_msg_header_t       *msg,
 397         mach_msg_size_t         slist_size,
 398         ipc_kmsg_t              kmsg);
 399
 400 /* free a scatter list */
 401 extern void ipc_kmsg_free_scatter(
 402         mach_msg_body_t         *slist,
 403         mach_msg_size_t         slist_size);
 404
 405 #include <mach_kdb.h>
 406 #if     MACH_KDB
 407
 408 /* Do a formatted dump of a kernel message */
 409 extern void ipc_kmsg_print(
 410         ipc_kmsg_t      kmsg);
 411
 412 /* Do a formatted dump of a user message */
 413 extern void ipc_msg_print(
 414         mach_msg_header_t       *msgh);
 415
 416 #endif  /* MACH_KDB */
 417
 418 #endif  /* _IPC_IPC_KMSG_H_ */