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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        6  
  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.  
  51. /** This is answer to a call */
  52. #define IPC_CALL_ANSWERED   (1 << 0)
  53. /** This call will not be freed on error */
  54. #define IPC_CALL_STATIC_ALLOC   (1 << 1)
  55. /** Answer will not be passed to userspace, will be discarded */
  56. #define IPC_CALL_DISCARD_ANSWER (1 << 2)
  57. /** Call was forwarded */
  58. #define IPC_CALL_FORWARDED  (1 << 3)
  59. /** Identify connect_me_to answer */
  60. #define IPC_CALL_CONN_ME_TO (1 << 4)
  61. /** Interrupt notification */
  62. #define IPC_CALL_NOTIF      (1 << 5)
  63.  
  64. /*
  65.  * Bits used in call hashes.
  66.  * The addresses are aligned at least to 4 that is why we can use the 2 least
  67.  * significant bits of the call address.
  68.  */
  69. /** Type of this call is 'answer' */
  70. #define IPC_CALLID_ANSWERED 1
  71. /** Type of this call is 'notification' */
  72. #define IPC_CALLID_NOTIFICATION 2
  73.  
  74. /* Return values from sys_ipc_call_async(). */
  75. #define IPC_CALLRET_FATAL   -1
  76. #define IPC_CALLRET_TEMPORARY   -2
  77.  
  78.  
  79. /* Macros for manipulating calling data */
  80. #define IPC_SET_RETVAL(data, retval)    ((data).args[0] = (retval))
  81. #define IPC_SET_METHOD(data, val)   ((data).args[0] = (val))
  82. #define IPC_SET_ARG1(data, val)     ((data).args[1] = (val))
  83. #define IPC_SET_ARG2(data, val)     ((data).args[2] = (val))
  84. #define IPC_SET_ARG3(data, val)     ((data).args[3] = (val))
  85. #define IPC_SET_ARG4(data, val)     ((data).args[4] = (val))
  86. #define IPC_SET_ARG5(data, val)     ((data).args[5] = (val))
  87.  
  88. #define IPC_GET_METHOD(data)        ((data).args[0])
  89. #define IPC_GET_RETVAL(data)        ((data).args[0])
  90.  
  91. #define IPC_GET_ARG1(data)      ((data).args[1])
  92. #define IPC_GET_ARG2(data)      ((data).args[2])
  93. #define IPC_GET_ARG3(data)      ((data).args[3])
  94. #define IPC_GET_ARG4(data)      ((data).args[4])
  95. #define IPC_GET_ARG5(data)      ((data).args[5])
  96.  
  97. /* Well known phone descriptors */
  98. #define PHONE_NS    0
  99.  
  100. /* Forwarding flags. */
  101. #define IPC_FF_NONE     0
  102. /**
  103.  * The call will be routed as though it was initially sent via the phone used to
  104.  * forward it. This feature is intended to support the situation in which the
  105.  * forwarded call needs to be handled by the same connection fibril as any other
  106.  * calls that were initially sent by the forwarder to the same destination. This
  107.  * flag has no imapct on routing replies.
  108.  */
  109. #define IPC_FF_ROUTE_FROM_ME    (1 << 0)
  110.  
  111. /* System-specific methods - only through special syscalls
  112.  * These methods have special behaviour
  113.  */
  114. /** Protocol for CONNECT - TO - ME
  115.  *
  116.  * Calling process asks the callee to create a callback connection,
  117.  * so that it can start initiating new messages.
  118.  *
  119.  * The protocol for negotiating is:
  120.  * - sys_connect_to_me - sends a message IPC_M_CONNECT_TO_ME
  121.  * - recipient         - upon receipt tries to allocate new phone
  122.  *                       - if it fails, responds with ELIMIT
  123.  *                     - passes call to userspace. If userspace
  124.  *                       responds with error, phone is deallocated and
  125.  *                       error is sent back to caller. Otherwise
  126.  *                       the call is accepted and the response is sent back.
  127.  *                     - the allocated phoneid is passed to userspace
  128.  *                       (on the receiving side) as ARG5 of the call.
  129.  */
  130. #define IPC_M_CONNECT_TO_ME 1
  131. /** Protocol for CONNECT - ME - TO
  132.  *
  133.  * Calling process asks the callee to create for him a new connection.
  134.  * E.g. the caller wants a name server to connect him to print server.
  135.  *
  136.  * The protocol for negotiating is:
  137.  * - sys_connect_me_to - send a synchronous message to name server
  138.  *                       indicating that it wants to be connected to some
  139.  *                       service
  140.  *                     - arg1/2/3 are user specified, arg5 contains
  141.  *                       address of the phone that should be connected
  142.  *                       (TODO: it leaks to userspace)
  143.  *  - recipient        -  if ipc_answer == 0, then accept connection
  144.  *                     -  otherwise connection refused
  145.  *                     -  recepient may forward message.
  146.  *
  147.  */
  148. #define IPC_M_CONNECT_ME_TO 2
  149. /** This message is sent to answerbox when the phone
  150.  * is hung up
  151.  */
  152. #define IPC_M_PHONE_HUNGUP  3
  153.  
  154. /** Send as_area over IPC.
  155.  * - ARG1 - source as_area base address
  156.  * - ARG2 - size of source as_area (filled automatically by kernel)
  157.  * - ARG3 - flags of the as_area being sent
  158.  *
  159.  * on answer, the recipient must set:
  160.  * - ARG1 - dst as_area base adress
  161.  */
  162. #define IPC_M_SHARE_OUT     4  
  163.  
  164. /** Receive as_area over IPC.
  165.  * - ARG1 - destination as_area base address
  166.  * - ARG2 - destination as_area size
  167.  * - ARG3 - user defined argument
  168.  *
  169.  * on answer, the recipient must set:
  170.  *
  171.  * - ARG1 - source as_area base address
  172.  * - ARG2 - flags that will be used for sharing
  173.  */
  174. #define IPC_M_SHARE_IN      5  
  175.  
  176. /** Send data to another address space over IPC.
  177.  * - ARG1 - source address space virtual address
  178.  * - ARG2 - size of data to be copied, may be overriden by the recipient
  179.  *
  180.  * on answer, the recipient must set:
  181.  *
  182.  * - ARG1 - final destination address space virtual address
  183.  * - ARG2 - final size of data to be copied
  184.  */
  185. #define IPC_M_DATA_WRITE    6
  186.  
  187. /** Receive data from another address space over IPC.
  188.  * - ARG1 - destination virtual address in the source address space
  189.  * - ARG2 - size of data to be received, may be cropped by the recipient
  190.  *
  191.  * on answer, the recipient must set:
  192.  *
  193.  * - ARG1 - source virtual address in the destination address space
  194.  * - ARG2 - final size of data to be copied
  195.  */
  196. #define IPC_M_DATA_READ     7
  197.  
  198. /* Well-known methods */
  199. #define IPC_M_LAST_SYSTEM   511
  200. #define IPC_M_PING      512
  201. /* User methods */
  202. #define IPC_FIRST_USER_METHOD   1024
  203.  
  204. #ifdef KERNEL
  205.  
  206. #define IPC_MAX_PHONES  16
  207.  
  208. #include <synch/spinlock.h>
  209. #include <synch/mutex.h>
  210. #include <synch/waitq.h>
  211.  
  212. struct answerbox;
  213. struct task;
  214.  
  215. typedef enum {
  216.     /** Phone is free and can be allocated */
  217.     IPC_PHONE_FREE = 0,
  218.     /** Phone is connecting somewhere */
  219.     IPC_PHONE_CONNECTING,
  220.     /** Phone is connected */
  221.     IPC_PHONE_CONNECTED,
  222.     /** Phone is hung up, waiting for answers to come */
  223.     IPC_PHONE_HUNGUP,
  224.     /** Phone was hungup from server */
  225.     IPC_PHONE_SLAMMED
  226. } ipc_phone_state_t;
  227.  
  228. /** Structure identifying phone (in TASK structure) */
  229. typedef struct {
  230.     mutex_t lock;
  231.     link_t link;
  232.     struct answerbox *callee;
  233.     ipc_phone_state_t state;
  234.     atomic_t active_calls;
  235. } phone_t;
  236.  
  237. typedef struct answerbox {
  238.     SPINLOCK_DECLARE(lock);
  239.  
  240.     struct task *task;
  241.  
  242.     waitq_t wq;
  243.  
  244.     /** Phones connected to this answerbox. */
  245.     link_t connected_phones;
  246.     /** Received calls. */
  247.     link_t calls;          
  248.     link_t dispatched_calls;    /* Should be hash table in the future */
  249.  
  250.     /** Answered calls. */
  251.     link_t answers;
  252.  
  253.     SPINLOCK_DECLARE(irq_lock);
  254.     /** Notifications from IRQ handlers. */
  255.     link_t irq_notifs;
  256.     /** IRQs with notifications to this answerbox. */
  257.     link_t irq_head;
  258. } answerbox_t;
  259.  
  260. typedef struct {
  261.     unative_t args[IPC_CALL_LEN];
  262.     phone_t *phone;
  263. } ipc_data_t;
  264.  
  265. typedef struct {
  266.     link_t link;
  267.  
  268.     int flags;
  269.  
  270.     /** Identification of the caller. */
  271.     struct task *sender;
  272.     /** The caller box is different from sender->answerbox for synchronous
  273.      *  calls. */
  274.     answerbox_t *callerbox;
  275.  
  276.     /** Private data to internal IPC. */
  277.     unative_t priv;
  278.  
  279.     /** Data passed from/to userspace. */
  280.     ipc_data_t data;
  281.  
  282.     /** Buffer for IPC_M_DATA_WRITE and IPC_M_DATA_READ. */
  283.     uint8_t *buffer;
  284.  
  285.     /*
  286.      * The forward operation can masquerade the caller phone. For those
  287.      * cases, we must keep it aside so that the answer is processed
  288.      * correctly.
  289.      */
  290.     phone_t *caller_phone;
  291. } call_t;
  292.  
  293. extern void ipc_init(void);
  294. extern call_t * ipc_wait_for_call(answerbox_t *, uint32_t, int);
  295. extern void ipc_answer(answerbox_t *, call_t *);
  296. extern int ipc_call(phone_t *, call_t *);
  297. extern int ipc_call_sync(phone_t *, call_t *);
  298. extern void ipc_phone_init(phone_t *);
  299. extern void ipc_phone_connect(phone_t *, answerbox_t *);
  300. extern void ipc_call_free(call_t *);
  301. extern call_t * ipc_call_alloc(int);
  302. extern void ipc_answerbox_init(answerbox_t *, struct task *);
  303. extern void ipc_call_static_init(call_t *);
  304. extern void task_print_list(void);
  305. extern int ipc_forward(call_t *, phone_t *, answerbox_t *, int);
  306. extern void ipc_cleanup(void);
  307. extern int ipc_phone_hangup(phone_t *);
  308. extern void ipc_backsend_err(phone_t *, call_t *, unative_t);
  309. extern void ipc_print_task(task_id_t);
  310.  
  311. extern answerbox_t *ipc_phone_0;
  312.  
  313. #endif
  314.  
  315. #endif
  316.  
  317. /** @}
  318.  */
  319.