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| Rev | Author | Line No. | Line |
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| 954 | palkovsky | 1 | /* |
| 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 | |||
| 29 | #include <ipc.h> |
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| 30 | #include <libc.h> |
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| 999 | palkovsky | 31 | #include <malloc.h> |
| 32 | #include <errno.h> |
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| 33 | #include <list.h> |
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| 34 | #include <stdio.h> |
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| 35 | #include <unistd.h> |
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| 954 | palkovsky | 36 | |
| 999 | palkovsky | 37 | /** Structure used for keeping track of sent async msgs |
| 38 | * and queing unsent msgs |
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| 39 | * |
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| 40 | */ |
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| 41 | typedef struct { |
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| 42 | link_t list; |
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| 43 | |||
| 44 | ipc_async_callback_t callback; |
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| 45 | void *private; |
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| 46 | union { |
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| 47 | ipc_callid_t callid; |
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| 48 | struct { |
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| 49 | int phoneid; |
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| 50 | ipc_data_t data; |
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| 51 | } msg; |
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| 52 | }u; |
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| 53 | } async_call_t; |
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| 54 | |||
| 55 | LIST_INITIALIZE(dispatched_calls); |
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| 56 | LIST_INITIALIZE(queued_calls); |
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| 57 | |||
| 58 | int ipc_call_sync(int phoneid, ipcarg_t method, ipcarg_t arg1, |
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| 59 | ipcarg_t *result) |
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| 954 | palkovsky | 60 | { |
| 966 | palkovsky | 61 | ipc_data_t resdata; |
| 62 | int callres; |
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| 63 | |||
| 999 | palkovsky | 64 | callres = __SYSCALL4(SYS_IPC_CALL_SYNC_FAST, phoneid, method, arg1, |
| 966 | palkovsky | 65 | (sysarg_t)&resdata); |
| 66 | if (callres) |
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| 67 | return callres; |
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| 68 | if (result) |
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| 69 | *result = IPC_GET_ARG1(resdata); |
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| 70 | return IPC_GET_RETVAL(resdata); |
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| 954 | palkovsky | 71 | } |
| 72 | |||
| 999 | palkovsky | 73 | int ipc_call_sync_3(int phoneid, ipcarg_t method, ipcarg_t arg1, |
| 74 | ipcarg_t arg2, ipcarg_t arg3, |
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| 75 | ipcarg_t *result1, ipcarg_t *result2, ipcarg_t *result3) |
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| 954 | palkovsky | 76 | { |
| 966 | palkovsky | 77 | ipc_data_t data; |
| 78 | int callres; |
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| 79 | |||
| 80 | IPC_SET_METHOD(data, method); |
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| 81 | IPC_SET_ARG1(data, arg1); |
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| 82 | IPC_SET_ARG2(data, arg2); |
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| 83 | IPC_SET_ARG3(data, arg3); |
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| 84 | |||
| 1006 | palkovsky | 85 | callres = __SYSCALL3(SYS_IPC_CALL_SYNC, phoneid, (sysarg_t)&data, |
| 86 | (sysarg_t)&data); |
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| 966 | palkovsky | 87 | if (callres) |
| 88 | return callres; |
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| 89 | |||
| 90 | if (result1) |
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| 91 | *result1 = IPC_GET_ARG1(data); |
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| 92 | if (result2) |
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| 93 | *result2 = IPC_GET_ARG2(data); |
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| 94 | if (result3) |
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| 95 | *result3 = IPC_GET_ARG3(data); |
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| 96 | return IPC_GET_RETVAL(data); |
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| 97 | } |
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| 98 | |||
| 999 | palkovsky | 99 | /** Syscall to send asynchronous message */ |
| 100 | static ipc_callid_t _ipc_call_async(int phoneid, ipc_data_t *data) |
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| 101 | { |
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| 102 | return __SYSCALL2(SYS_IPC_CALL_ASYNC, phoneid, (sysarg_t)data); |
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| 103 | } |
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| 104 | |||
| 966 | palkovsky | 105 | /** Send asynchronous message |
| 106 | * |
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| 107 | * - if fatal error, call callback handler with proper error code |
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| 108 | * - if message cannot be temporarily sent, add to queue |
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| 109 | */ |
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| 999 | palkovsky | 110 | void ipc_call_async_2(int phoneid, ipcarg_t method, ipcarg_t arg1, |
| 111 | ipcarg_t arg2, void *private, |
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| 966 | palkovsky | 112 | ipc_async_callback_t callback) |
| 113 | { |
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| 999 | palkovsky | 114 | async_call_t *call; |
| 966 | palkovsky | 115 | ipc_callid_t callid; |
| 116 | |||
| 999 | palkovsky | 117 | call = malloc(sizeof(*call)); |
| 118 | if (!call) { |
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| 119 | callback(private, ENOMEM, NULL); |
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| 120 | } |
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| 121 | |||
| 122 | callid = __SYSCALL4(SYS_IPC_CALL_ASYNC_FAST, phoneid, method, arg1, arg2); |
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| 966 | palkovsky | 123 | if (callid == IPC_CALLRET_FATAL) { |
| 124 | /* Call asynchronous handler with error code */ |
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| 999 | palkovsky | 125 | callback(private, ENOENT, NULL); |
| 126 | free(call); |
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| 966 | palkovsky | 127 | return; |
| 128 | } |
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| 999 | palkovsky | 129 | |
| 130 | call->callback = callback; |
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| 131 | call->private = private; |
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| 132 | |||
| 966 | palkovsky | 133 | if (callid == IPC_CALLRET_TEMPORARY) { |
| 134 | /* Add asynchronous call to queue of non-dispatched async calls */ |
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| 999 | palkovsky | 135 | call->u.msg.phoneid = phoneid; |
| 136 | IPC_SET_METHOD(call->u.msg.data, method); |
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| 137 | IPC_SET_ARG1(call->u.msg.data, arg1); |
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| 138 | IPC_SET_ARG2(call->u.msg.data, arg2); |
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| 139 | |||
| 140 | list_append(&call->list, &queued_calls); |
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| 966 | palkovsky | 141 | return; |
| 142 | } |
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| 999 | palkovsky | 143 | call->u.callid = callid; |
| 144 | /* Add call to list of dispatched calls */ |
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| 145 | list_append(&call->list, &dispatched_calls); |
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| 954 | palkovsky | 146 | } |
| 147 | |||
| 966 | palkovsky | 148 | |
| 149 | /** Send answer to a received call */ |
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| 999 | palkovsky | 150 | void ipc_answer(ipc_callid_t callid, ipcarg_t retval, ipcarg_t arg1, |
| 151 | ipcarg_t arg2) |
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| 954 | palkovsky | 152 | { |
| 1006 | palkovsky | 153 | __SYSCALL4(SYS_IPC_ANSWER_FAST, callid, retval, arg1, arg2); |
| 954 | palkovsky | 154 | } |
| 155 | |||
| 966 | palkovsky | 156 | |
| 954 | palkovsky | 157 | /** Call syscall function sys_ipc_wait_for_call */ |
| 1006 | palkovsky | 158 | static inline ipc_callid_t _ipc_wait_for_call(ipc_call_t *call, int flags) |
| 954 | palkovsky | 159 | { |
| 1006 | palkovsky | 160 | return __SYSCALL3(SYS_IPC_WAIT, (sysarg_t)&call->data, |
| 161 | (sysarg_t)&call->taskid, flags); |
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| 954 | palkovsky | 162 | } |
| 163 | |||
| 999 | palkovsky | 164 | /** Try to dispatch queed calls from async queue */ |
| 165 | static void try_dispatch_queued_calls(void) |
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| 166 | { |
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| 167 | async_call_t *call; |
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| 168 | ipc_callid_t callid; |
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| 169 | |||
| 170 | while (!list_empty(&queued_calls)) { |
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| 171 | call = list_get_instance(queued_calls.next, async_call_t, |
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| 172 | list); |
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| 173 | |||
| 174 | callid = _ipc_call_async(call->u.msg.phoneid, |
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| 175 | &call->u.msg.data); |
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| 176 | if (callid == IPC_CALLRET_TEMPORARY) |
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| 177 | break; |
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| 178 | list_remove(&call->list); |
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| 179 | if (callid == IPC_CALLRET_FATAL) { |
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| 180 | call->callback(call->private, ENOENT, NULL); |
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| 181 | free(call); |
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| 182 | } else { |
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| 183 | call->u.callid = callid; |
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| 184 | list_append(&call->list, &dispatched_calls); |
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| 185 | } |
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| 186 | } |
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| 187 | } |
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| 188 | |||
| 189 | /** Handle received answer |
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| 190 | * |
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| 191 | * TODO: Make it use hash table |
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| 192 | * |
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| 193 | * @param callid Callid (with first bit set) of the answered call |
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| 194 | */ |
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| 195 | static void handle_answer(ipc_callid_t callid, ipc_data_t *data) |
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| 196 | { |
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| 197 | link_t *item; |
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| 198 | async_call_t *call; |
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| 199 | |||
| 200 | callid &= ~IPC_CALLID_ANSWERED; |
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| 201 | |||
| 202 | for (item = dispatched_calls.next; item != &dispatched_calls; |
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| 203 | item = item->next) { |
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| 204 | call = list_get_instance(item, async_call_t, list); |
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| 205 | if (call->u.callid == callid) { |
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| 206 | list_remove(&call->list); |
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| 207 | call->callback(call->private, |
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| 208 | IPC_GET_RETVAL(*data), |
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| 209 | data); |
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| 210 | return; |
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| 211 | } |
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| 212 | } |
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| 213 | printf("Received unidentified answer: %P!!!\n", callid); |
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| 214 | } |
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| 215 | |||
| 216 | |||
| 954 | palkovsky | 217 | /** Wait for IPC call and return |
| 218 | * |
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| 219 | * - dispatch ASYNC reoutines in the background |
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| 999 | palkovsky | 220 | * @param data Space where the message is stored |
| 221 | * @return Callid or 0 if nothing available and started with |
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| 222 | * IPC_WAIT_NONBLOCKING |
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| 954 | palkovsky | 223 | */ |
| 1006 | palkovsky | 224 | int ipc_wait_for_call(ipc_call_t *call, int flags) |
| 954 | palkovsky | 225 | { |
| 226 | ipc_callid_t callid; |
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| 227 | |||
| 966 | palkovsky | 228 | do { |
| 999 | palkovsky | 229 | try_dispatch_queued_calls(); |
| 230 | |||
| 1006 | palkovsky | 231 | callid = _ipc_wait_for_call(call, flags); |
| 999 | palkovsky | 232 | /* Handle received answers */ |
| 233 | if (callid & IPC_CALLID_ANSWERED) |
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| 1006 | palkovsky | 234 | handle_answer(callid, &call->data); |
| 966 | palkovsky | 235 | } while (callid & IPC_CALLID_ANSWERED); |
| 999 | palkovsky | 236 | |
| 954 | palkovsky | 237 | return callid; |
| 238 | } |