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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. #ifdef CONFIG_DEBUG
  38. # define IPC_MAX_ASYNC_CALLS  4
  39. #else
  40. # define IPC_MAX_ASYNC_CALLS  4000
  41. #endif
  42.  
  43. /* Flags for calls */
  44. #define IPC_CALL_ANSWERED       (1<<0) /**< This is answer to a call */
  45. #define IPC_CALL_STATIC_ALLOC   (1<<1) /**< This call will not be freed on error */
  46. #define IPC_CALL_DISCARD_ANSWER (1<<2) /**< Answer will not be passed to
  47.                     * userspace, will be discarded */
  48. #define IPC_CALL_FORWARDED      (1<<3) /* Call was forwarded */
  49. #define IPC_CALL_CONN_ME_TO     (1<<4) /* Identify connect_me_to answer */
  50. #define IPC_CALL_NOTIF          (1<<5) /* Interrupt notification */
  51.  
  52. /* Flags of callid (the addresses are aligned at least to 4,
  53.  * that is why we can use bottom 2 bits of the call address
  54.  */
  55. #define IPC_CALLID_ANSWERED       1 /**< Type of this msg is 'answer' */
  56. #define IPC_CALLID_NOTIFICATION   2 /**< Type of this msg is 'notification' */
  57.  
  58. /* Return values from IPC_ASYNC */
  59. #define IPC_CALLRET_FATAL         -1
  60. #define IPC_CALLRET_TEMPORARY     -2
  61.  
  62.  
  63. /* Macros for manipulating calling data */
  64. #define IPC_SET_RETVAL(data, retval)   ((data).args[0] = (retval))
  65. #define IPC_SET_METHOD(data, val)   ((data).args[0] = (val))
  66. #define IPC_SET_ARG1(data, val)   ((data).args[1] = (val))
  67. #define IPC_SET_ARG2(data, val)   ((data).args[2] = (val))
  68. #define IPC_SET_ARG3(data, val)   ((data).args[3] = (val))
  69.  
  70. #define IPC_GET_METHOD(data)           ((data).args[0])
  71. #define IPC_GET_RETVAL(data)           ((data).args[0])
  72.  
  73. #define IPC_GET_ARG1(data)              ((data).args[1])
  74. #define IPC_GET_ARG2(data)              ((data).args[2])
  75. #define IPC_GET_ARG3(data)              ((data).args[3])
  76.  
  77. /* Well known phone descriptors */
  78. #define PHONE_NS              0
  79.  
  80. /* System-specific methods - only through special syscalls
  81.  * These methods have special behaviour
  82.  */
  83. /** Protocol for CONNECT - TO - ME
  84.  *
  85.  * Calling process asks the callee to create a callback connection,
  86.  * so that it can start initiating new messages.
  87.  *
  88.  * The protocol for negotiating is:
  89.  * - sys_connect_to_me - sends a message IPC_M_CONNECTTOME
  90.  * - sys_wait_for_call - upon receipt tries to allocate new phone
  91.  *                       - if it fails, responds with ELIMIT
  92.  *                     - passes call to userspace. If userspace
  93.  *                       responds with error, phone is deallocated and
  94.  *                       error is sent back to caller. Otherwise
  95.  *                       the call is accepted and the response is sent back.
  96.  *                     - the allocated phoneid is passed to userspace
  97.  *                       (on the receiving sid) as ARG3 of the call.
  98.  *                     - the caller obtains taskid of the called thread
  99.  */
  100. #define IPC_M_CONNECT_TO_ME     1
  101. /** Protocol for CONNECT - ME - TO
  102.  *
  103.  * Calling process asks the callee to create for him a new connection.
  104.  * E.g. the caller wants a name server to connect him to print server.
  105.  *
  106.  * The protocol for negotiating is:
  107.  * - sys_connect_me_to - send a synchronous message to name server
  108.  *                       indicating that it wants to be connected to some
  109.  *                       service
  110.  *                     - arg1/2 are user specified, arg3 contains
  111.  *                       address of the phone that should be connected
  112.  *                       (TODO: it leaks to userspace)
  113.  *   recipient         -  if ipc_answer == 0, then accept connection
  114.  *                     -  otherwise connection refused
  115.  *                     -  recepient may forward message. Forwarding
  116.  *                        system message
  117.  *
  118.  */
  119. #define IPC_M_CONNECT_ME_TO     2
  120. /** This message is sent to answerbox when the phone
  121.  * is hung up
  122.  */
  123. #define IPC_M_PHONE_HUNGUP      3
  124. /** Interrupt notification */
  125. #define IPC_M_INTERRUPT         4
  126.  
  127. /** Send as_area over IPC
  128.  * - ARG1 - src base address
  129.  * - ARG2 - size of src as(filled automatically by kernel)
  130.  * - ARG3 - flags of the area being sent
  131.  * - on answer ARG1 - dst base adress
  132.  */
  133. #define IPC_M_AS_AREA_SEND      5
  134.  
  135. /** Get as_area over IPC
  136.  * - ARG1 - Where the area will be mapped
  137.  * - ARG2 - Expected size of area
  138.  * - ARG3 - User defined argument
  139.  * on answer - the server sets ARG1 as src as address of the as_area
  140.  * to be shared, ARG2 is set to rights that will be used for sharing,
  141.  * which is returned as part of answer back to the receiver
  142.  */
  143. #define IPC_M_AS_AREA_RECV      6
  144.  
  145.  
  146. /* Well-known methods */
  147. #define IPC_M_LAST_SYSTEM     511
  148. #define IPC_M_PING            512
  149. /* User methods */
  150. #define FIRST_USER_METHOD     1024
  151.  
  152. #ifdef KERNEL
  153.  
  154. #include <synch/mutex.h>
  155. #include <synch/condvar.h>
  156. #include <adt/list.h>
  157.  
  158. #define IPC_MAX_PHONES  16
  159.  
  160. typedef struct answerbox_s answerbox_t;
  161. typedef struct phone_s phone_t;
  162. typedef struct {
  163.     __native args[IPC_CALL_LEN];
  164.     phone_t *phone;
  165. }ipc_data_t;
  166.  
  167. struct answerbox_s {
  168.     SPINLOCK_DECLARE(lock);
  169.  
  170.     task_t *task;
  171.  
  172.     waitq_t wq;
  173.  
  174.     link_t connected_phones; /**< Phones connected to this answerbox */
  175.     link_t calls;            /**< Received calls */
  176.     link_t dispatched_calls; /* Should be hash table in the future */
  177.  
  178.     link_t answers;          /**< Answered calls */
  179.  
  180.     SPINLOCK_DECLARE(irq_lock);
  181.     link_t irq_notifs;       /**< Notifications from IRQ handlers */
  182. };
  183.  
  184. typedef enum {
  185.     IPC_PHONE_FREE = 0,     /**< Phone is free and can be allocated */
  186.     IPC_PHONE_CONNECTING,   /**< Phone is connecting somewhere */
  187.     IPC_PHONE_CONNECTED,    /**< Phone is connected */
  188.     IPC_PHONE_HUNGUP,  /**< Phone is hung up, waiting for answers to come */
  189.     IPC_PHONE_SLAMMED       /**< Phone was hungup from server */
  190. } ipc_phone_state_t;
  191.  
  192. /** Structure identifying phone (in TASK structure) */
  193. struct phone_s {
  194.     SPINLOCK_DECLARE(lock);
  195.     link_t link;
  196.     answerbox_t *callee;
  197.     ipc_phone_state_t state;
  198.     atomic_t active_calls;
  199. };
  200.  
  201. typedef struct {
  202.     link_t link;
  203.  
  204.     int flags;
  205.  
  206.     /* Identification of the caller */
  207.     task_t *sender;
  208.     /* The caller box is different from sender->answerbox
  209.      * for synchronous calls
  210.      */
  211.     answerbox_t *callerbox;
  212.  
  213.     __native private; /**< Private data to internal IPC */
  214.  
  215.     ipc_data_t data;  /**< Data passed from/to userspace */
  216. }call_t;
  217.  
  218. extern void ipc_init(void);
  219. extern call_t * ipc_wait_for_call(answerbox_t *box, __u32 usec, int flags);
  220. extern void ipc_answer(answerbox_t *box, call_t *request);
  221. extern int ipc_call(phone_t *phone, call_t *call);
  222. extern void ipc_call_sync(phone_t *phone, call_t *request);
  223. extern void ipc_phone_init(phone_t *phone);
  224. extern void ipc_phone_connect(phone_t *phone, answerbox_t *box);
  225. extern void ipc_call_free(call_t *call);
  226. extern call_t * ipc_call_alloc(int flags);
  227. extern void ipc_answerbox_init(answerbox_t *box);
  228. extern void ipc_call_static_init(call_t *call);
  229. extern void task_print_list(void);
  230. extern int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox);
  231. void ipc_cleanup(void);
  232. int ipc_phone_hangup(phone_t *phone);
  233. extern void ipc_backsend_err(phone_t *phone, call_t *call, __native err);
  234. extern void ipc_print_task(task_id_t taskid);
  235.  
  236. extern answerbox_t *ipc_phone_0;
  237.  
  238. #endif
  239.  
  240. #endif
  241.