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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 | |||
1352 | palkovsky | 29 | #include <ipc/ipc.h> |
954 | palkovsky | 30 | #include <libc.h> |
999 | palkovsky | 31 | #include <malloc.h> |
32 | #include <errno.h> |
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1352 | palkovsky | 33 | #include <libadt/list.h> |
999 | palkovsky | 34 | #include <stdio.h> |
35 | #include <unistd.h> |
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1350 | palkovsky | 36 | #include <futex.h> |
954 | palkovsky | 37 | |
999 | palkovsky | 38 | /** Structure used for keeping track of sent async msgs |
39 | * and queing unsent msgs |
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40 | * |
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41 | */ |
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42 | typedef struct { |
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43 | link_t list; |
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44 | |||
45 | ipc_async_callback_t callback; |
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46 | void *private; |
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47 | union { |
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48 | ipc_callid_t callid; |
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49 | struct { |
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1091 | palkovsky | 50 | ipc_call_t data; |
999 | palkovsky | 51 | int phoneid; |
52 | } msg; |
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53 | }u; |
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54 | } async_call_t; |
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55 | |||
56 | LIST_INITIALIZE(dispatched_calls); |
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57 | LIST_INITIALIZE(queued_calls); |
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58 | |||
1350 | palkovsky | 59 | static atomic_t ipc_futex; |
60 | |||
61 | void _ipc_init(void) |
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62 | { |
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63 | futex_initialize(&ipc_futex, 1); |
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64 | } |
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65 | |||
999 | palkovsky | 66 | int ipc_call_sync(int phoneid, ipcarg_t method, ipcarg_t arg1, |
67 | ipcarg_t *result) |
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954 | palkovsky | 68 | { |
1091 | palkovsky | 69 | ipc_call_t resdata; |
966 | palkovsky | 70 | int callres; |
71 | |||
999 | palkovsky | 72 | callres = __SYSCALL4(SYS_IPC_CALL_SYNC_FAST, phoneid, method, arg1, |
966 | palkovsky | 73 | (sysarg_t)&resdata); |
74 | if (callres) |
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75 | return callres; |
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76 | if (result) |
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77 | *result = IPC_GET_ARG1(resdata); |
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78 | return IPC_GET_RETVAL(resdata); |
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954 | palkovsky | 79 | } |
80 | |||
999 | palkovsky | 81 | int ipc_call_sync_3(int phoneid, ipcarg_t method, ipcarg_t arg1, |
82 | ipcarg_t arg2, ipcarg_t arg3, |
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83 | ipcarg_t *result1, ipcarg_t *result2, ipcarg_t *result3) |
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954 | palkovsky | 84 | { |
1091 | palkovsky | 85 | ipc_call_t data; |
966 | palkovsky | 86 | int callres; |
87 | |||
88 | IPC_SET_METHOD(data, method); |
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89 | IPC_SET_ARG1(data, arg1); |
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90 | IPC_SET_ARG2(data, arg2); |
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91 | IPC_SET_ARG3(data, arg3); |
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92 | |||
1006 | palkovsky | 93 | callres = __SYSCALL3(SYS_IPC_CALL_SYNC, phoneid, (sysarg_t)&data, |
94 | (sysarg_t)&data); |
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966 | palkovsky | 95 | if (callres) |
96 | return callres; |
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97 | |||
98 | if (result1) |
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99 | *result1 = IPC_GET_ARG1(data); |
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100 | if (result2) |
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101 | *result2 = IPC_GET_ARG2(data); |
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102 | if (result3) |
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103 | *result3 = IPC_GET_ARG3(data); |
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104 | return IPC_GET_RETVAL(data); |
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105 | } |
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106 | |||
999 | palkovsky | 107 | /** Syscall to send asynchronous message */ |
1091 | palkovsky | 108 | static ipc_callid_t _ipc_call_async(int phoneid, ipc_call_t *data) |
999 | palkovsky | 109 | { |
110 | return __SYSCALL2(SYS_IPC_CALL_ASYNC, phoneid, (sysarg_t)data); |
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111 | } |
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112 | |||
966 | palkovsky | 113 | /** Send asynchronous message |
114 | * |
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115 | * - if fatal error, call callback handler with proper error code |
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116 | * - if message cannot be temporarily sent, add to queue |
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117 | */ |
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999 | palkovsky | 118 | void ipc_call_async_2(int phoneid, ipcarg_t method, ipcarg_t arg1, |
119 | ipcarg_t arg2, void *private, |
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966 | palkovsky | 120 | ipc_async_callback_t callback) |
121 | { |
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999 | palkovsky | 122 | async_call_t *call; |
966 | palkovsky | 123 | ipc_callid_t callid; |
124 | |||
999 | palkovsky | 125 | call = malloc(sizeof(*call)); |
126 | if (!call) { |
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127 | callback(private, ENOMEM, NULL); |
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1028 | palkovsky | 128 | return; |
999 | palkovsky | 129 | } |
130 | |||
131 | callid = __SYSCALL4(SYS_IPC_CALL_ASYNC_FAST, phoneid, method, arg1, arg2); |
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966 | palkovsky | 132 | if (callid == IPC_CALLRET_FATAL) { |
133 | /* Call asynchronous handler with error code */ |
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999 | palkovsky | 134 | callback(private, ENOENT, NULL); |
135 | free(call); |
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966 | palkovsky | 136 | return; |
137 | } |
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999 | palkovsky | 138 | |
139 | call->callback = callback; |
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140 | call->private = private; |
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141 | |||
966 | palkovsky | 142 | if (callid == IPC_CALLRET_TEMPORARY) { |
143 | /* Add asynchronous call to queue of non-dispatched async calls */ |
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999 | palkovsky | 144 | call->u.msg.phoneid = phoneid; |
145 | IPC_SET_METHOD(call->u.msg.data, method); |
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146 | IPC_SET_ARG1(call->u.msg.data, arg1); |
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147 | IPC_SET_ARG2(call->u.msg.data, arg2); |
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1350 | palkovsky | 148 | |
149 | futex_down(&ipc_futex); |
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999 | palkovsky | 150 | list_append(&call->list, &queued_calls); |
1350 | palkovsky | 151 | futex_up(&ipc_futex); |
966 | palkovsky | 152 | return; |
153 | } |
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999 | palkovsky | 154 | call->u.callid = callid; |
155 | /* Add call to list of dispatched calls */ |
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1350 | palkovsky | 156 | futex_down(&ipc_futex); |
999 | palkovsky | 157 | list_append(&call->list, &dispatched_calls); |
1350 | palkovsky | 158 | futex_up(&ipc_futex); |
954 | palkovsky | 159 | } |
160 | |||
966 | palkovsky | 161 | |
1343 | jermar | 162 | /** Send a fast answer to a received call. |
163 | * |
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164 | * The fast answer makes use of passing retval and first two arguments in registers. |
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165 | * If you need to return more, use the ipc_answer() instead. |
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166 | * |
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167 | * @param callid ID of the call being answered. |
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168 | * @param retval Return value. |
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169 | * @param arg1 First return argument. |
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170 | * @param arg2 Second return argument. |
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171 | * |
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172 | * @return Zero on success or a value from @ref errno.h on failure. |
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173 | */ |
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174 | ipcarg_t ipc_answer_fast(ipc_callid_t callid, ipcarg_t retval, ipcarg_t arg1, |
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999 | palkovsky | 175 | ipcarg_t arg2) |
954 | palkovsky | 176 | { |
1330 | palkovsky | 177 | return __SYSCALL4(SYS_IPC_ANSWER_FAST, callid, retval, arg1, arg2); |
954 | palkovsky | 178 | } |
179 | |||
1343 | jermar | 180 | /** Send a full answer to a received call. |
181 | * |
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182 | * @param callid ID of the call being answered. |
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183 | * @param call Call data. Must be already initialized by the responder. |
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184 | * |
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185 | * @return Zero on success or a value from @ref errno.h on failure. |
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186 | */ |
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187 | ipcarg_t ipc_answer(ipc_callid_t callid, ipc_call_t *call) |
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188 | { |
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189 | return __SYSCALL2(SYS_IPC_ANSWER, callid, (sysarg_t) call); |
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190 | } |
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191 | |||
192 | |||
999 | palkovsky | 193 | /** Try to dispatch queed calls from async queue */ |
194 | static void try_dispatch_queued_calls(void) |
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195 | { |
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196 | async_call_t *call; |
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197 | ipc_callid_t callid; |
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198 | |||
1350 | palkovsky | 199 | futex_down(&ipc_futex); |
999 | palkovsky | 200 | while (!list_empty(&queued_calls)) { |
201 | call = list_get_instance(queued_calls.next, async_call_t, |
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202 | list); |
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203 | |||
204 | callid = _ipc_call_async(call->u.msg.phoneid, |
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205 | &call->u.msg.data); |
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206 | if (callid == IPC_CALLRET_TEMPORARY) |
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207 | break; |
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208 | list_remove(&call->list); |
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1350 | palkovsky | 209 | |
999 | palkovsky | 210 | if (callid == IPC_CALLRET_FATAL) { |
1350 | palkovsky | 211 | futex_up(&ipc_futex); |
999 | palkovsky | 212 | call->callback(call->private, ENOENT, NULL); |
213 | free(call); |
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1350 | palkovsky | 214 | futex_down(&ipc_futex); |
999 | palkovsky | 215 | } else { |
216 | call->u.callid = callid; |
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217 | list_append(&call->list, &dispatched_calls); |
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218 | } |
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219 | } |
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1350 | palkovsky | 220 | futex_up(&ipc_futex); |
999 | palkovsky | 221 | } |
222 | |||
223 | /** Handle received answer |
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224 | * |
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225 | * TODO: Make it use hash table |
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226 | * |
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227 | * @param callid Callid (with first bit set) of the answered call |
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228 | */ |
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1091 | palkovsky | 229 | static void handle_answer(ipc_callid_t callid, ipc_call_t *data) |
999 | palkovsky | 230 | { |
231 | link_t *item; |
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232 | async_call_t *call; |
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233 | |||
234 | callid &= ~IPC_CALLID_ANSWERED; |
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235 | |||
1350 | palkovsky | 236 | futex_down(&ipc_futex); |
999 | palkovsky | 237 | for (item = dispatched_calls.next; item != &dispatched_calls; |
238 | item = item->next) { |
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239 | call = list_get_instance(item, async_call_t, list); |
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240 | if (call->u.callid == callid) { |
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241 | list_remove(&call->list); |
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1350 | palkovsky | 242 | futex_up(&ipc_futex); |
999 | palkovsky | 243 | call->callback(call->private, |
244 | IPC_GET_RETVAL(*data), |
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245 | data); |
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246 | return; |
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247 | } |
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248 | } |
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1350 | palkovsky | 249 | futex_up(&ipc_futex); |
999 | palkovsky | 250 | printf("Received unidentified answer: %P!!!\n", callid); |
251 | } |
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252 | |||
253 | |||
954 | palkovsky | 254 | /** Wait for IPC call and return |
255 | * |
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256 | * - dispatch ASYNC reoutines in the background |
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999 | palkovsky | 257 | * @param data Space where the message is stored |
258 | * @return Callid or 0 if nothing available and started with |
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259 | * IPC_WAIT_NONBLOCKING |
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954 | palkovsky | 260 | */ |
1028 | palkovsky | 261 | ipc_callid_t ipc_wait_for_call(ipc_call_t *call, int flags) |
954 | palkovsky | 262 | { |
263 | ipc_callid_t callid; |
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264 | |||
966 | palkovsky | 265 | do { |
999 | palkovsky | 266 | try_dispatch_queued_calls(); |
267 | |||
1091 | palkovsky | 268 | callid = __SYSCALL2(SYS_IPC_WAIT, (sysarg_t)call, flags); |
999 | palkovsky | 269 | /* Handle received answers */ |
270 | if (callid & IPC_CALLID_ANSWERED) |
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1091 | palkovsky | 271 | handle_answer(callid, call); |
966 | palkovsky | 272 | } while (callid & IPC_CALLID_ANSWERED); |
999 | palkovsky | 273 | |
954 | palkovsky | 274 | return callid; |
275 | } |
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1028 | palkovsky | 276 | |
1091 | palkovsky | 277 | /** Ask destination to do a callback connection |
278 | * |
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279 | * @return 0 - OK, error code |
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280 | */ |
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281 | int ipc_connect_to_me(int phoneid, int arg1, int arg2, ipcarg_t *phone) |
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1028 | palkovsky | 282 | { |
1091 | palkovsky | 283 | return ipc_call_sync_3(phoneid, IPC_M_CONNECT_TO_ME, arg1, |
284 | arg2, 0, 0, 0, phone); |
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1028 | palkovsky | 285 | } |
1061 | palkovsky | 286 | |
1091 | palkovsky | 287 | /** Ask through phone for a new connection to some service |
288 | * |
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289 | * @return new phoneid - OK, error code |
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290 | */ |
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1061 | palkovsky | 291 | int ipc_connect_me_to(int phoneid, int arg1, int arg2) |
292 | { |
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1092 | palkovsky | 293 | ipcarg_t newphid; |
1091 | palkovsky | 294 | int res; |
295 | |||
296 | res = ipc_call_sync_3(phoneid, IPC_M_CONNECT_ME_TO, arg1, |
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297 | arg2, 0, 0, 0, &newphid); |
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298 | if (res) |
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299 | return res; |
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300 | return newphid; |
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1061 | palkovsky | 301 | } |
302 | |||
1089 | palkovsky | 303 | /* Hang up specified phone */ |
304 | int ipc_hangup(int phoneid) |
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305 | { |
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306 | return __SYSCALL1(SYS_IPC_HANGUP, phoneid); |
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307 | } |
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1259 | palkovsky | 308 | |
1282 | palkovsky | 309 | int ipc_register_irq(int irq, irq_code_t *ucode) |
1259 | palkovsky | 310 | { |
1282 | palkovsky | 311 | return __SYSCALL2(SYS_IPC_REGISTER_IRQ, irq, (sysarg_t) ucode); |
1259 | palkovsky | 312 | } |
313 | |||
314 | int ipc_unregister_irq(int irq) |
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315 | { |
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316 | return __SYSCALL1(SYS_IPC_UNREGISTER_IRQ, irq); |
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317 | } |
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1330 | palkovsky | 318 | |
1336 | jermar | 319 | int ipc_forward_fast(ipc_callid_t callid, int phoneid, int method, ipcarg_t arg1) |
320 | { |
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321 | return __SYSCALL4(SYS_IPC_FORWARD_FAST, callid, phoneid, method, arg1); |
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322 | } |
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323 | |||
1350 | palkovsky | 324 | |
325 | /** Open shared memory connection over specified phoneid |
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326 | * |
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327 | * |
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1360 | jermar | 328 | * Allocate as_area, notify the other side about our intention |
1350 | palkovsky | 329 | * to open the connection |
330 | * |
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331 | * @return Connection id identifying this connection |
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332 | */ |
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333 | //int ipc_dgr_open(int pohoneid, size_t bufsize) |
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334 | //{ |
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335 | /* Find new file descriptor in local descriptor table */ |
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336 | /* Create AS_area, initialize structures */ |
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337 | /* Send AS to other side, handle error states */ |
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338 | |||
339 | //} |
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1330 | palkovsky | 340 | /* |
1350 | palkovsky | 341 | void ipc_dgr_close(int cid) |
1330 | palkovsky | 342 | { |
343 | } |
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344 | |||
1350 | palkovsky | 345 | void * ipc_dgr_alloc(int cid, size_t size) |
346 | { |
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347 | } |
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1330 | palkovsky | 348 | |
1350 | palkovsky | 349 | void ipc_dgr_free(int cid, void *area) |
350 | { |
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351 | |||
352 | } |
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353 | |||
354 | int ipc_dgr_send(int cid, void *area) |
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355 | { |
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356 | } |
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357 | |||
358 | |||
359 | int ipc_dgr_send_data(int cid, void *data, size_t size) |
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360 | { |
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361 | } |
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362 | |||
1330 | palkovsky | 363 | */ |