| 1 | /*
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| 2 | * Copyright (c) 2006 Ondrej Palkovsky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup genericipc
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #ifndef KERN_IPC_H_
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| 36 | #define KERN_IPC_H_
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| 37 |
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| 38 | /* Length of data being transfered with IPC call */
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| 39 | /* - the uspace may not be able to utilize full length */
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| 40 | #define IPC_CALL_LEN 4
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| 41 |
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| 42 | /** Maximum active async calls per thread */
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| 43 | #ifdef CONFIG_DEBUG
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| 44 | # define IPC_MAX_ASYNC_CALLS 4
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| 45 | #else
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| 46 | # define IPC_MAX_ASYNC_CALLS 4000
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| 47 | #endif
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| 48 |
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| 49 | /* Flags for calls */
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| 50 |
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| 51 | /** This is answer to a call */
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| 52 | #define IPC_CALL_ANSWERED (1 << 0)
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| 53 | /** This call will not be freed on error */
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| 54 | #define IPC_CALL_STATIC_ALLOC (1 << 1)
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| 55 | /** Answer will not be passed to userspace, will be discarded */
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| 56 | #define IPC_CALL_DISCARD_ANSWER (1 << 2)
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| 57 | /** Call was forwarded */
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| 58 | #define IPC_CALL_FORWARDED (1 << 3)
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| 59 | /** Identify connect_me_to answer */
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| 60 | #define IPC_CALL_CONN_ME_TO (1 << 4)
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| 61 | /** Interrupt notification */
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| 62 | #define IPC_CALL_NOTIF (1 << 5)
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| 63 |
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| 64 | /* Flags of callid (the addresses are aligned at least to 4,
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| 65 | * that is why we can use bottom 2 bits of the call address
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| 66 | */
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| 67 | /** Type of this msg is 'answer' */
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| 68 | #define IPC_CALLID_ANSWERED 1
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| 69 | /** Type of this msg is 'notification' */
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| 70 | #define IPC_CALLID_NOTIFICATION 2
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| 71 |
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| 72 | /* Return values from IPC_ASYNC */
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| 73 | #define IPC_CALLRET_FATAL -1
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| 74 | #define IPC_CALLRET_TEMPORARY -2
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| 75 |
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| 76 |
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| 77 | /* Macros for manipulating calling data */
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| 78 | #define IPC_SET_RETVAL(data, retval) ((data).args[0] = (retval))
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| 79 | #define IPC_SET_METHOD(data, val) ((data).args[0] = (val))
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| 80 | #define IPC_SET_ARG1(data, val) ((data).args[1] = (val))
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| 81 | #define IPC_SET_ARG2(data, val) ((data).args[2] = (val))
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| 82 | #define IPC_SET_ARG3(data, val) ((data).args[3] = (val))
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| 83 |
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| 84 | #define IPC_GET_METHOD(data) ((data).args[0])
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| 85 | #define IPC_GET_RETVAL(data) ((data).args[0])
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| 86 |
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| 87 | #define IPC_GET_ARG1(data) ((data).args[1])
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| 88 | #define IPC_GET_ARG2(data) ((data).args[2])
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| 89 | #define IPC_GET_ARG3(data) ((data).args[3])
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| 90 |
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| 91 | /* Well known phone descriptors */
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| 92 | #define PHONE_NS 0
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| 93 |
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| 94 | /* System-specific methods - only through special syscalls
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| 95 | * These methods have special behaviour
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| 96 | */
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| 97 | /** Protocol for CONNECT - TO - ME
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| 98 | *
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| 99 | * Calling process asks the callee to create a callback connection,
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| 100 | * so that it can start initiating new messages.
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| 101 | *
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| 102 | * The protocol for negotiating is:
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| 103 | * - sys_connect_to_me - sends a message IPC_M_CONNECTTOME
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| 104 | * - sys_wait_for_call - upon receipt tries to allocate new phone
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| 105 | * - if it fails, responds with ELIMIT
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| 106 | * - passes call to userspace. If userspace
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| 107 | * responds with error, phone is deallocated and
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| 108 | * error is sent back to caller. Otherwise
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| 109 | * the call is accepted and the response is sent back.
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| 110 | * - the allocated phoneid is passed to userspace
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| 111 | * (on the receiving sid) as ARG3 of the call.
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| 112 | * - the caller obtains taskid of the called thread
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| 113 | */
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| 114 | #define IPC_M_CONNECT_TO_ME 1
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| 115 | /** Protocol for CONNECT - ME - TO
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| 116 | *
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| 117 | * Calling process asks the callee to create for him a new connection.
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| 118 | * E.g. the caller wants a name server to connect him to print server.
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| 119 | *
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| 120 | * The protocol for negotiating is:
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| 121 | * - sys_connect_me_to - send a synchronous message to name server
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| 122 | * indicating that it wants to be connected to some
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| 123 | * service
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| 124 | * - arg1/2 are user specified, arg3 contains
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| 125 | * address of the phone that should be connected
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| 126 | * (TODO: it leaks to userspace)
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| 127 | * recipient - if ipc_answer == 0, then accept connection
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| 128 | * - otherwise connection refused
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| 129 | * - recepient may forward message. Forwarding
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| 130 | * system message
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| 131 | *
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| 132 | */
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| 133 | #define IPC_M_CONNECT_ME_TO 2
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| 134 | /** This message is sent to answerbox when the phone
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| 135 | * is hung up
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| 136 | */
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| 137 | #define IPC_M_PHONE_HUNGUP 3
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| 138 |
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| 139 | /** Send as_area over IPC
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| 140 | * - ARG1 - src as_area base address
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| 141 | * - ARG2 - size of src as_area (filled automatically by kernel)
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| 142 | * - ARG3 - flags of the as_area being sent
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| 143 | *
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| 144 | * on answer:
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| 145 | * - ARG1 - dst as_area base adress
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| 146 | */
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| 147 | #define IPC_M_AS_AREA_SEND 5
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| 148 |
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| 149 | /** Get as_area over IPC
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| 150 | * - ARG1 - dst as_area base address
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| 151 | * - ARG2 - dst as_area size
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| 152 | * - ARG3 - user defined argument
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| 153 | *
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| 154 | * on answer, the server must set:
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| 155 | *
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| 156 | * - ARG1 - src as_area base address
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| 157 | * - ARG2 - flags that will be used for sharing
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| 158 | */
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| 159 | #define IPC_M_AS_AREA_RECV 6
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| 160 |
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| 161 |
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| 162 | /* Well-known methods */
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| 163 | #define IPC_M_LAST_SYSTEM 511
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| 164 | #define IPC_M_PING 512
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| 165 | /* User methods */
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| 166 | #define FIRST_USER_METHOD 1024
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| 167 |
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| 168 | #ifdef KERNEL
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| 169 |
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| 170 | #define IPC_MAX_PHONES 16
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| 171 |
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| 172 | #include <synch/waitq.h>
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| 173 |
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| 174 | struct answerbox;
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| 175 | struct task;
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| 176 |
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| 177 | typedef enum {
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| 178 | /** Phone is free and can be allocated */
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| 179 | IPC_PHONE_FREE = 0,
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| 180 | /** Phone is connecting somewhere */
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| 181 | IPC_PHONE_CONNECTING,
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| 182 | /** Phone is connected */
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| 183 | IPC_PHONE_CONNECTED,
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| 184 | /** Phone is hung up, waiting for answers to come */
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| 185 | IPC_PHONE_HUNGUP,
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| 186 | /** Phone was hungup from server */
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| 187 | IPC_PHONE_SLAMMED
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| 188 | } ipc_phone_state_t;
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| 189 |
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| 190 | /** Structure identifying phone (in TASK structure) */
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| 191 | typedef struct {
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| 192 | SPINLOCK_DECLARE(lock);
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| 193 | link_t link;
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| 194 | struct answerbox *callee;
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| 195 | ipc_phone_state_t state;
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| 196 | atomic_t active_calls;
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| 197 | } phone_t;
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| 198 |
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| 199 | typedef struct answerbox {
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| 200 | SPINLOCK_DECLARE(lock);
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| 201 |
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| 202 | struct task *task;
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| 203 |
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| 204 | waitq_t wq;
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| 205 |
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| 206 | /** Phones connected to this answerbox */
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| 207 | link_t connected_phones;
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| 208 | /** Received calls */
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| 209 | link_t calls;
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| 210 | link_t dispatched_calls; /* Should be hash table in the future */
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| 211 |
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| 212 | /** Answered calls */
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| 213 | link_t answers;
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| 214 |
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| 215 | SPINLOCK_DECLARE(irq_lock);
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| 216 | /** Notifications from IRQ handlers */
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| 217 | link_t irq_notifs;
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| 218 | /** IRQs with notifications to this answerbox. */
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| 219 | link_t irq_head;
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| 220 | } answerbox_t;
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| 221 |
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| 222 | typedef struct {
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| 223 | unative_t args[IPC_CALL_LEN];
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| 224 | phone_t *phone;
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| 225 | } ipc_data_t;
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| 226 |
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| 227 | typedef struct {
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| 228 | link_t link;
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| 229 |
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| 230 | int flags;
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| 231 |
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| 232 | /* Identification of the caller */
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| 233 | struct task *sender;
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| 234 | /* The caller box is different from sender->answerbox
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| 235 | * for synchronous calls
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| 236 | */
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| 237 | answerbox_t *callerbox;
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| 238 |
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| 239 | /** Private data to internal IPC */
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| 240 | unative_t priv;
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| 241 |
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| 242 | /** Data passed from/to userspace */
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| 243 | ipc_data_t data;
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| 244 | } call_t;
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| 245 |
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| 246 | extern void ipc_init(void);
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| 247 | extern call_t * ipc_wait_for_call(answerbox_t *box, uint32_t usec, int flags);
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| 248 | extern void ipc_answer(answerbox_t *box, call_t *request);
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| 249 | extern int ipc_call(phone_t *phone, call_t *call);
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| 250 | extern void ipc_call_sync(phone_t *phone, call_t *request);
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| 251 | extern void ipc_phone_init(phone_t *phone);
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| 252 | extern void ipc_phone_connect(phone_t *phone, answerbox_t *box);
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| 253 | extern void ipc_call_free(call_t *call);
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| 254 | extern call_t * ipc_call_alloc(int flags);
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| 255 | extern void ipc_answerbox_init(answerbox_t *box);
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| 256 | extern void ipc_call_static_init(call_t *call);
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| 257 | extern void task_print_list(void);
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| 258 | extern int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox);
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| 259 | void ipc_cleanup(void);
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| 260 | int ipc_phone_hangup(phone_t *phone);
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| 261 | extern void ipc_backsend_err(phone_t *phone, call_t *call, unative_t err);
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| 262 | extern void ipc_print_task(task_id_t taskid);
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| 263 |
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| 264 | extern answerbox_t *ipc_phone_0;
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| 265 |
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| 266 | #endif
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| 267 |
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| 268 | #endif
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| 269 |
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| 270 | /** @}
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| 271 | */
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