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