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  1. /*
  2.  * Copyright (C) 2006 Ondrej Palkovsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - 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.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __IPC_H__
  30. #define __IPC_H__
  31.  
  32. /* Length of data being transfered with IPC call */
  33. /* - the uspace may not be able to utilize full length */
  34. #define IPC_CALL_LEN    4
  35.  
  36. /** Maximum active async calls per thread */
  37. #define IPC_MAX_ASYNC_CALLS  4
  38.  
  39. /* Flags for calls */
  40. #define IPC_CALL_ANSWERED      1 /**< This is answer to a call */
  41. #define IPC_CALL_STATIC_ALLOC  2 /**< This call will not be freed on error */
  42.  
  43. /* Flags for ipc_wait_for_call */
  44. #define IPC_WAIT_NONBLOCKING   1
  45.  
  46. /* Flags of callid */
  47. #define IPC_CALLID_ANSWERED  1
  48.  
  49. /* Return values from IPC_ASYNC */
  50. #define IPC_CALLRET_FATAL         -1
  51. #define IPC_CALLRET_TEMPORARY     -2
  52.  
  53.  
  54. /* Macros for manipulating calling data */
  55. #define IPC_SET_RETVAL(data, retval)   ((data)[0] = (retval))
  56. #define IPC_SET_METHOD(data, val)   ((data)[0] = (val))
  57. #define IPC_SET_ARG1(data, val)   ((data)[1] = (val))
  58. #define IPC_SET_ARG2(data, val)   ((data)[2] = (val))
  59. #define IPC_SET_ARG3(data, val)   ((data)[3] = (val))
  60.  
  61. #define IPC_GET_METHOD(data)           ((data)[0])
  62. #define IPC_GET_RETVAL(data)           ((data)[0])
  63.  
  64. #define IPC_GET_ARG1(data)              ((data)[1])
  65. #define IPC_GET_ARG2(data)              ((data)[2])
  66. #define IPC_GET_ARG3(data)              ((data)[3])
  67.  
  68. /* Well known phone descriptors */
  69. #define PHONE_NS              0
  70.  
  71. /* System-specific methods - only through special syscalls
  72.  * These methods have special behaviour
  73.  */
  74. /** Protocol for CONNECT - TO - ME
  75.  *
  76.  * Calling process asks the callee to create a callback connection,
  77.  * so that it can start initiating new messages.
  78.  *
  79.  * The protocol for negotiating is:
  80.  * - sys_connecttome - sends a message IPC_M_CONNECTTOME
  81.  * - sys_wait_for_call - upon receipt tries to allocate new phone
  82.  *                       - if it fails, responds with ELIMIT
  83.  *                     - passes call to userspace. If userspace
  84.  *                       responds with error, phone is deallocated and
  85.  *                       error is sent back to caller. Otherwise
  86.  *                       the call is accepted and the response is sent back.
  87.  *                     - the allocated phoneid is passed to userspace
  88.  *                       (on the receiving sid) as ARG3 of the call.
  89.  *                     - the caller obtains taskid of the called thread
  90.  */
  91. #define IPC_M_CONNECTTOME     1
  92. /** Protocol for CONNECT - ME - TO
  93.  *
  94.  * Calling process asks the callee to create for him a new connection.
  95.  * E.g. the caller wants a name server to connect him to print server.
  96.  *
  97.  * The protocol for negotiating is:
  98.  * - sys_connect_me_to - send a synchronous message to name server
  99.  *                       indicating that it wants to be connected to some
  100.  *                       service
  101.  *   recepient         -  if ipc_answer == 0, then accept connection
  102.  *                     -  otherwise connection refused
  103.  *                     -  recepient may forward message. Forwarding
  104.  *                        system message
  105.  *
  106.  */
  107. #define IPC_M_CONNECTMETO     2
  108. /* Control messages that the server sends to the processes
  109.  * about their connections.
  110.  */
  111.  
  112.  
  113. /* Well-known methods */
  114. #define IPC_M_LAST_SYSTEM     511
  115. #define IPC_M_PING            512
  116. /* User methods */
  117. #define FIRST_USER_METHOD     1024
  118.  
  119. #ifdef KERNEL
  120.  
  121. #include <synch/mutex.h>
  122. #include <synch/condvar.h>
  123. #include <adt/list.h>
  124.  
  125. #define IPC_MAX_PHONES  16
  126.  
  127. typedef struct answerbox answerbox_t;
  128. typedef __native ipc_data_t[IPC_CALL_LEN];
  129.  
  130. typedef struct {
  131.     link_t list;
  132.     answerbox_t *callerbox;
  133.     int flags;
  134.     task_t *sender;
  135.     ipc_data_t data;
  136. } call_t;
  137.  
  138. struct answerbox {
  139.     SPINLOCK_DECLARE(lock);
  140.  
  141.     task_t *task;
  142.  
  143.     waitq_t wq;
  144.  
  145.     link_t connected_phones; /**< Phones connected to this answerbox */
  146.     link_t calls;            /**< Received calls */
  147.     link_t dispatched_calls; /* Should be hash table in the future */
  148.  
  149.     link_t answers;          /**< Answered calls */
  150. };
  151.  
  152. typedef struct {
  153.     SPINLOCK_DECLARE(lock);
  154.     link_t list;
  155.     answerbox_t *callee;
  156.     int busy;
  157. } phone_t;
  158.  
  159. extern void ipc_init(void);
  160. extern call_t * ipc_wait_for_call(answerbox_t *box, int flags);
  161. extern void ipc_answer(answerbox_t *box, call_t *request);
  162. extern void ipc_call(phone_t *phone, call_t *request);
  163. extern void ipc_call_sync(phone_t *phone, call_t *request);
  164. extern void ipc_phone_destroy(phone_t *phone);
  165. extern void ipc_phone_init(phone_t *phone);
  166. extern void ipc_phone_connect(phone_t *phone, answerbox_t *box);
  167. extern void ipc_call_free(call_t *call);
  168. extern call_t * ipc_call_alloc(void);
  169. extern void ipc_answerbox_init(answerbox_t *box);
  170. extern void ipc_call_init(call_t *call);
  171. extern void ipc_forward(call_t *call, answerbox_t *newbox,answerbox_t *oldbox);
  172.  
  173. extern answerbox_t *ipc_phone_0;
  174.  
  175. #endif
  176.  
  177. #endif
  178.