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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. /** @addtogroup genericipc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_IPC_H_
  36. #define KERN_IPC_H_
  37.  
  38. /* Length of data being transfered with IPC call */
  39. /* - the uspace may not be able to utilize full length */
  40. #define IPC_CALL_LEN    4
  41.  
  42. /** Maximum active async calls per thread */
  43. #ifdef CONFIG_DEBUG
  44. # define IPC_MAX_ASYNC_CALLS  4
  45. #else
  46. # define IPC_MAX_ASYNC_CALLS  4000
  47. #endif
  48.  
  49. /* Flags for calls */
  50. #define IPC_CALL_ANSWERED       (1<<0) /**< This is answer to a call */
  51. #define IPC_CALL_STATIC_ALLOC   (1<<1) /**< This call will not be freed on error */
  52. #define IPC_CALL_DISCARD_ANSWER (1<<2) /**< Answer will not be passed to userspace, will be discarded */
  53. #define IPC_CALL_FORWARDED      (1<<3) /**< Call was forwarded */
  54. #define IPC_CALL_CONN_ME_TO     (1<<4) /**< Identify connect_me_to answer */
  55. #define IPC_CALL_NOTIF          (1<<5) /**< Interrupt notification */
  56.  
  57. /* Flags of callid (the addresses are aligned at least to 4,
  58.  * that is why we can use bottom 2 bits of the call address
  59.  */
  60. #define IPC_CALLID_ANSWERED       1 /**< Type of this msg is 'answer' */
  61. #define IPC_CALLID_NOTIFICATION   2 /**< Type of this msg is 'notification' */
  62.  
  63. /* Return values from IPC_ASYNC */
  64. #define IPC_CALLRET_FATAL         -1
  65. #define IPC_CALLRET_TEMPORARY     -2
  66.  
  67.  
  68. /* Macros for manipulating calling data */
  69. #define IPC_SET_RETVAL(data, retval)   ((data).args[0] = (retval))
  70. #define IPC_SET_METHOD(data, val)   ((data).args[0] = (val))
  71. #define IPC_SET_ARG1(data, val)   ((data).args[1] = (val))
  72. #define IPC_SET_ARG2(data, val)   ((data).args[2] = (val))
  73. #define IPC_SET_ARG3(data, val)   ((data).args[3] = (val))
  74.  
  75. #define IPC_GET_METHOD(data)           ((data).args[0])
  76. #define IPC_GET_RETVAL(data)           ((data).args[0])
  77.  
  78. #define IPC_GET_ARG1(data)              ((data).args[1])
  79. #define IPC_GET_ARG2(data)              ((data).args[2])
  80. #define IPC_GET_ARG3(data)              ((data).args[3])
  81.  
  82. /* Well known phone descriptors */
  83. #define PHONE_NS              0
  84.  
  85. /* System-specific methods - only through special syscalls
  86.  * These methods have special behaviour
  87.  */
  88. /** Protocol for CONNECT - TO - ME
  89.  *
  90.  * Calling process asks the callee to create a callback connection,
  91.  * so that it can start initiating new messages.
  92.  *
  93.  * The protocol for negotiating is:
  94.  * - sys_connect_to_me - sends a message IPC_M_CONNECTTOME
  95.  * - sys_wait_for_call - upon receipt tries to allocate new phone
  96.  *                       - if it fails, responds with ELIMIT
  97.  *                     - passes call to userspace. If userspace
  98.  *                       responds with error, phone is deallocated and
  99.  *                       error is sent back to caller. Otherwise
  100.  *                       the call is accepted and the response is sent back.
  101.  *                     - the allocated phoneid is passed to userspace
  102.  *                       (on the receiving sid) as ARG3 of the call.
  103.  *                     - the caller obtains taskid of the called thread
  104.  */
  105. #define IPC_M_CONNECT_TO_ME     1
  106. /** Protocol for CONNECT - ME - TO
  107.  *
  108.  * Calling process asks the callee to create for him a new connection.
  109.  * E.g. the caller wants a name server to connect him to print server.
  110.  *
  111.  * The protocol for negotiating is:
  112.  * - sys_connect_me_to - send a synchronous message to name server
  113.  *                       indicating that it wants to be connected to some
  114.  *                       service
  115.  *                     - arg1/2 are user specified, arg3 contains
  116.  *                       address of the phone that should be connected
  117.  *                       (TODO: it leaks to userspace)
  118.  *   recipient         -  if ipc_answer == 0, then accept connection
  119.  *                     -  otherwise connection refused
  120.  *                     -  recepient may forward message. Forwarding
  121.  *                        system message
  122.  *
  123.  */
  124. #define IPC_M_CONNECT_ME_TO     2
  125. /** This message is sent to answerbox when the phone
  126.  * is hung up
  127.  */
  128. #define IPC_M_PHONE_HUNGUP      3
  129.  
  130. /** Send as_area over IPC
  131.  * - ARG1 - src as_area base address
  132.  * - ARG2 - size of src as_area (filled automatically by kernel)
  133.  * - ARG3 - flags of the as_area being sent
  134.  *
  135.  * on answer:
  136.  * - ARG1 - dst as_area base adress
  137.  */
  138. #define IPC_M_AS_AREA_SEND      5
  139.  
  140. /** Get as_area over IPC
  141.  * - ARG1 - dst as_area base address
  142.  * - ARG2 - dst as_area size
  143.  * - ARG3 - user defined argument
  144.  *
  145.  * on answer, the server must set:
  146.  *
  147.  * - ARG1 - src as_area base address
  148.  * - ARG2 - flags that will be used for sharing
  149.  */
  150. #define IPC_M_AS_AREA_RECV      6
  151.  
  152.  
  153. /* Well-known methods */
  154. #define IPC_M_LAST_SYSTEM     511
  155. #define IPC_M_PING            512
  156. /* User methods */
  157. #define FIRST_USER_METHOD     1024
  158.  
  159. #ifdef KERNEL
  160.  
  161. #define IPC_MAX_PHONES  16
  162.  
  163. #include <synch/waitq.h>
  164.  
  165. struct answerbox;
  166. struct task;
  167.  
  168. typedef enum {
  169.     IPC_PHONE_FREE = 0,     /**< Phone is free and can be allocated */
  170.     IPC_PHONE_CONNECTING,   /**< Phone is connecting somewhere */
  171.     IPC_PHONE_CONNECTED,    /**< Phone is connected */
  172.     IPC_PHONE_HUNGUP,   /**< Phone is hung up, waiting for answers to come */
  173.     IPC_PHONE_SLAMMED       /**< Phone was hungup from server */
  174. } ipc_phone_state_t;
  175.  
  176. /** Structure identifying phone (in TASK structure) */
  177. typedef struct {
  178.     SPINLOCK_DECLARE(lock);
  179.     link_t link;
  180.     struct answerbox *callee;
  181.     ipc_phone_state_t state;
  182.     atomic_t active_calls;
  183. } phone_t;
  184.  
  185. typedef struct answerbox {
  186.     SPINLOCK_DECLARE(lock);
  187.  
  188.     struct task *task;
  189.  
  190.     waitq_t wq;
  191.  
  192.     link_t connected_phones;    /**< Phones connected to this answerbox */
  193.     link_t calls;           /**< Received calls */
  194.     link_t dispatched_calls;    /* Should be hash table in the future */
  195.  
  196.     link_t answers;         /**< Answered calls */
  197.  
  198.     SPINLOCK_DECLARE(irq_lock);
  199.     link_t irq_notifs;          /**< Notifications from IRQ handlers */
  200.     link_t irq_head;        /**< IRQs with notifications to this answerbox. */
  201. } answerbox_t;
  202.  
  203. typedef struct {
  204.     unative_t args[IPC_CALL_LEN];
  205.     phone_t *phone;
  206. } ipc_data_t;
  207.  
  208. typedef struct {
  209.     link_t link;
  210.  
  211.     int flags;
  212.  
  213.     /* Identification of the caller */
  214.     struct task *sender;
  215.     /* The caller box is different from sender->answerbox
  216.      * for synchronous calls
  217.      */
  218.     answerbox_t *callerbox;
  219.  
  220.     unative_t priv; /**< Private data to internal IPC */
  221.  
  222.     ipc_data_t data;  /**< Data passed from/to userspace */
  223. } call_t;
  224.  
  225. extern void ipc_init(void);
  226. extern call_t * ipc_wait_for_call(answerbox_t *box, uint32_t usec, int flags);
  227. extern void ipc_answer(answerbox_t *box, call_t *request);
  228. extern int ipc_call(phone_t *phone, call_t *call);
  229. extern void ipc_call_sync(phone_t *phone, call_t *request);
  230. extern void ipc_phone_init(phone_t *phone);
  231. extern void ipc_phone_connect(phone_t *phone, answerbox_t *box);
  232. extern void ipc_call_free(call_t *call);
  233. extern call_t * ipc_call_alloc(int flags);
  234. extern void ipc_answerbox_init(answerbox_t *box);
  235. extern void ipc_call_static_init(call_t *call);
  236. extern void task_print_list(void);
  237. extern int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox);
  238. void ipc_cleanup(void);
  239. int ipc_phone_hangup(phone_t *phone);
  240. extern void ipc_backsend_err(phone_t *phone, call_t *call, unative_t err);
  241. extern void ipc_print_task(task_id_t taskid);
  242.  
  243. extern answerbox_t *ipc_phone_0;
  244.  
  245. #endif
  246.  
  247. #endif
  248.  
  249. /** @}
  250.  */
  251.