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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<<0) /**< This is answer to a call */
  41. #define IPC_CALL_STATIC_ALLOC   (1<<1) /**< This call will not be freed on error */
  42. #define IPC_CALL_DISCARD_ANSWER (1<<2) /**< Answer will not be passed to
  43.                     * userspace, will be discarded */
  44. #define IPC_CALL_FORWARDED      (1<<3) /* Call was forwarded */
  45. #define IPC_CALL_CONN_ME_TO     (1<<4) /* Identify connect_me_to */
  46.  
  47. /* Flags for ipc_wait_for_call */
  48. #define IPC_WAIT_NONBLOCKING   1
  49.  
  50. /* Flags of callid (the addresses are aligned at least to 4,
  51.  * that is why we can use bottom 2 bits of the call address
  52.  */
  53. #define IPC_CALLID_ANSWERED       1 /**< Type of this msg is 'answer' */
  54. #define IPC_CALLID_NOTIFICATION   2 /**< Type of this msg is 'notification' */
  55.  
  56. /* Return values from IPC_ASYNC */
  57. #define IPC_CALLRET_FATAL         -1
  58. #define IPC_CALLRET_TEMPORARY     -2
  59.  
  60.  
  61. /* Macros for manipulating calling data */
  62. #define IPC_SET_RETVAL(data, retval)   ((data).args[0] = (retval))
  63. #define IPC_SET_METHOD(data, val)   ((data).args[0] = (val))
  64. #define IPC_SET_ARG1(data, val)   ((data).args[1] = (val))
  65. #define IPC_SET_ARG2(data, val)   ((data).args[2] = (val))
  66. #define IPC_SET_ARG3(data, val)   ((data).args[3] = (val))
  67.  
  68. #define IPC_GET_METHOD(data)           ((data).args[0])
  69. #define IPC_GET_RETVAL(data)           ((data).args[0])
  70.  
  71. #define IPC_GET_ARG1(data)              ((data).args[1])
  72. #define IPC_GET_ARG2(data)              ((data).args[2])
  73. #define IPC_GET_ARG3(data)              ((data).args[3])
  74.  
  75. /* Well known phone descriptors */
  76. #define PHONE_NS              0
  77.  
  78. /* System-specific methods - only through special syscalls
  79.  * These methods have special behaviour
  80.  */
  81. /** Protocol for CONNECT - TO - ME
  82.  *
  83.  * Calling process asks the callee to create a callback connection,
  84.  * so that it can start initiating new messages.
  85.  *
  86.  * The protocol for negotiating is:
  87.  * - sys_connect_to_me - sends a message IPC_M_CONNECTTOME
  88.  * - sys_wait_for_call - upon receipt tries to allocate new phone
  89.  *                       - if it fails, responds with ELIMIT
  90.  *                     - passes call to userspace. If userspace
  91.  *                       responds with error, phone is deallocated and
  92.  *                       error is sent back to caller. Otherwise
  93.  *                       the call is accepted and the response is sent back.
  94.  *                     - the allocated phoneid is passed to userspace
  95.  *                       (on the receiving sid) as ARG3 of the call.
  96.  *                     - the caller obtains taskid of the called thread
  97.  */
  98. #define IPC_M_CONNECT_TO_ME     1
  99. /** Protocol for CONNECT - ME - TO
  100.  *
  101.  * Calling process asks the callee to create for him a new connection.
  102.  * E.g. the caller wants a name server to connect him to print server.
  103.  *
  104.  * The protocol for negotiating is:
  105.  * - sys_connect_me_to - send a synchronous message to name server
  106.  *                       indicating that it wants to be connected to some
  107.  *                       service
  108.  *                     - arg1/2 are user specified, arg3 contains
  109.  *                       address of the phone that should be connected
  110.  *                       (TODO: it leaks to userspace)
  111.  *   recepient         -  if ipc_answer == 0, then accept connection
  112.  *                     -  otherwise connection refused
  113.  *                     -  recepient may forward message. Forwarding
  114.  *                        system message
  115.  *
  116.  */
  117. #define IPC_M_CONNECT_ME_TO     2
  118. /** This message is sent to answerbox when the phone
  119.  * is hung up
  120.  */
  121. #define IPC_M_PHONE_HUNGUP      3
  122.  
  123.  
  124. /* Well-known methods */
  125. #define IPC_M_LAST_SYSTEM     511
  126. #define IPC_M_PING            512
  127. /* User methods */
  128. #define FIRST_USER_METHOD     1024
  129.  
  130. #ifdef KERNEL
  131.  
  132. #include <synch/mutex.h>
  133. #include <synch/condvar.h>
  134. #include <adt/list.h>
  135.  
  136. #define IPC_MAX_PHONES  16
  137.  
  138. typedef struct answerbox_s answerbox_t;
  139. typedef struct phone_s phone_t;
  140. typedef struct {
  141.     __native args[IPC_CALL_LEN];
  142.     phone_t *phone;
  143. }ipc_data_t;
  144.  
  145. struct answerbox_s {
  146.     SPINLOCK_DECLARE(lock);
  147.  
  148.     task_t *task;
  149.  
  150.     waitq_t wq;
  151.  
  152.     link_t connected_phones; /**< Phones connected to this answerbox */
  153.     link_t calls;            /**< Received calls */
  154.     link_t dispatched_calls; /* Should be hash table in the future */
  155.  
  156.     link_t answers;          /**< Answered calls */
  157. };
  158.  
  159. typedef enum {
  160.     IPC_BUSY_FREE = 0,
  161.     IPC_BUSY_CONNECTING,
  162.     IPC_BUSY_CONNECTED
  163. } ipc_busy_t;
  164.  
  165. struct phone_s {
  166.     SPINLOCK_DECLARE(lock);
  167.     link_t list;
  168.     answerbox_t *callee;
  169.     ipc_busy_t busy;
  170.     atomic_t active_calls;
  171. };
  172.  
  173. typedef struct {
  174.     link_t list;
  175.  
  176.     int flags;
  177.  
  178.     /* Identification of the caller */
  179.     task_t *sender;
  180.     /* The caller box is different from sender->answerbox
  181.      * for synchronous calls
  182.      */
  183.     answerbox_t *callerbox;
  184.  
  185.     __native private; /**< Private data to internal IPC */
  186.  
  187.     ipc_data_t data;  /**< Data passed from/to userspace */
  188. }call_t;
  189.  
  190. extern void ipc_init(void);
  191. extern call_t * ipc_wait_for_call(answerbox_t *box, int flags);
  192. extern void ipc_answer(answerbox_t *box, call_t *request);
  193. extern int ipc_call(phone_t *phone, call_t *call);
  194. extern void ipc_call_sync(phone_t *phone, call_t *request);
  195. extern void ipc_phone_init(phone_t *phone);
  196. extern void ipc_phone_connect(phone_t *phone, answerbox_t *box);
  197. extern void ipc_call_free(call_t *call);
  198. extern call_t * ipc_call_alloc(void);
  199. extern void ipc_answerbox_init(answerbox_t *box);
  200. extern void ipc_call_static_init(call_t *call);
  201. extern void task_print_list(void);
  202. extern int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox);
  203. extern void ipc_cleanup(task_t *task);
  204. extern int ipc_phone_hangup(phone_t *phone);
  205. extern void ipc_backsend_err(phone_t *phone, call_t *call, __native err);
  206.  
  207. extern answerbox_t *ipc_phone_0;
  208.  
  209. #endif
  210.  
  211. #endif
  212.