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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> |
1365 | jermar | 37 | #include <kernel/synch/synch.h> |
954 | palkovsky | 38 | |
999 | palkovsky | 39 | /** Structure used for keeping track of sent async msgs |
40 | * and queing unsent msgs |
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41 | * |
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42 | */ |
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43 | typedef struct { |
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44 | link_t list; |
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45 | |||
46 | ipc_async_callback_t callback; |
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47 | void *private; |
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48 | union { |
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49 | ipc_callid_t callid; |
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50 | struct { |
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1091 | palkovsky | 51 | ipc_call_t data; |
999 | palkovsky | 52 | int phoneid; |
53 | } msg; |
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54 | }u; |
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55 | } async_call_t; |
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56 | |||
57 | LIST_INITIALIZE(dispatched_calls); |
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58 | LIST_INITIALIZE(queued_calls); |
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59 | |||
1392 | palkovsky | 60 | static atomic_t ipc_futex = FUTEX_INITIALIZER; |
1350 | palkovsky | 61 | |
999 | palkovsky | 62 | int ipc_call_sync(int phoneid, ipcarg_t method, ipcarg_t arg1, |
63 | ipcarg_t *result) |
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954 | palkovsky | 64 | { |
1091 | palkovsky | 65 | ipc_call_t resdata; |
966 | palkovsky | 66 | int callres; |
67 | |||
999 | palkovsky | 68 | callres = __SYSCALL4(SYS_IPC_CALL_SYNC_FAST, phoneid, method, arg1, |
966 | palkovsky | 69 | (sysarg_t)&resdata); |
70 | if (callres) |
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71 | return callres; |
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72 | if (result) |
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73 | *result = IPC_GET_ARG1(resdata); |
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74 | return IPC_GET_RETVAL(resdata); |
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954 | palkovsky | 75 | } |
76 | |||
999 | palkovsky | 77 | int ipc_call_sync_3(int phoneid, ipcarg_t method, ipcarg_t arg1, |
78 | ipcarg_t arg2, ipcarg_t arg3, |
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79 | ipcarg_t *result1, ipcarg_t *result2, ipcarg_t *result3) |
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954 | palkovsky | 80 | { |
1091 | palkovsky | 81 | ipc_call_t data; |
966 | palkovsky | 82 | int callres; |
83 | |||
84 | IPC_SET_METHOD(data, method); |
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85 | IPC_SET_ARG1(data, arg1); |
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86 | IPC_SET_ARG2(data, arg2); |
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87 | IPC_SET_ARG3(data, arg3); |
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88 | |||
1006 | palkovsky | 89 | callres = __SYSCALL3(SYS_IPC_CALL_SYNC, phoneid, (sysarg_t)&data, |
90 | (sysarg_t)&data); |
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966 | palkovsky | 91 | if (callres) |
92 | return callres; |
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93 | |||
94 | if (result1) |
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95 | *result1 = IPC_GET_ARG1(data); |
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96 | if (result2) |
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97 | *result2 = IPC_GET_ARG2(data); |
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98 | if (result3) |
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99 | *result3 = IPC_GET_ARG3(data); |
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100 | return IPC_GET_RETVAL(data); |
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101 | } |
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102 | |||
999 | palkovsky | 103 | /** Syscall to send asynchronous message */ |
1091 | palkovsky | 104 | static ipc_callid_t _ipc_call_async(int phoneid, ipc_call_t *data) |
999 | palkovsky | 105 | { |
106 | return __SYSCALL2(SYS_IPC_CALL_ASYNC, phoneid, (sysarg_t)data); |
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107 | } |
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108 | |||
966 | palkovsky | 109 | /** Send asynchronous message |
110 | * |
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111 | * - if fatal error, call callback handler with proper error code |
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112 | * - if message cannot be temporarily sent, add to queue |
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113 | */ |
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999 | palkovsky | 114 | void ipc_call_async_2(int phoneid, ipcarg_t method, ipcarg_t arg1, |
115 | ipcarg_t arg2, void *private, |
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966 | palkovsky | 116 | ipc_async_callback_t callback) |
117 | { |
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999 | palkovsky | 118 | async_call_t *call; |
966 | palkovsky | 119 | ipc_callid_t callid; |
120 | |||
999 | palkovsky | 121 | call = malloc(sizeof(*call)); |
122 | if (!call) { |
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1443 | palkovsky | 123 | if (callback) |
124 | callback(private, ENOMEM, NULL); |
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1028 | palkovsky | 125 | return; |
999 | palkovsky | 126 | } |
127 | |||
128 | callid = __SYSCALL4(SYS_IPC_CALL_ASYNC_FAST, phoneid, method, arg1, arg2); |
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966 | palkovsky | 129 | if (callid == IPC_CALLRET_FATAL) { |
130 | /* Call asynchronous handler with error code */ |
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1443 | palkovsky | 131 | if (callback) |
132 | callback(private, ENOENT, NULL); |
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999 | palkovsky | 133 | free(call); |
966 | palkovsky | 134 | return; |
135 | } |
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999 | palkovsky | 136 | |
137 | call->callback = callback; |
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138 | call->private = private; |
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139 | |||
966 | palkovsky | 140 | if (callid == IPC_CALLRET_TEMPORARY) { |
141 | /* Add asynchronous call to queue of non-dispatched async calls */ |
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999 | palkovsky | 142 | call->u.msg.phoneid = phoneid; |
143 | IPC_SET_METHOD(call->u.msg.data, method); |
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144 | IPC_SET_ARG1(call->u.msg.data, arg1); |
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145 | IPC_SET_ARG2(call->u.msg.data, arg2); |
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1350 | palkovsky | 146 | |
147 | futex_down(&ipc_futex); |
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999 | palkovsky | 148 | list_append(&call->list, &queued_calls); |
1350 | palkovsky | 149 | futex_up(&ipc_futex); |
966 | palkovsky | 150 | return; |
151 | } |
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999 | palkovsky | 152 | call->u.callid = callid; |
153 | /* Add call to list of dispatched calls */ |
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1350 | palkovsky | 154 | futex_down(&ipc_futex); |
999 | palkovsky | 155 | list_append(&call->list, &dispatched_calls); |
1350 | palkovsky | 156 | futex_up(&ipc_futex); |
954 | palkovsky | 157 | } |
158 | |||
966 | palkovsky | 159 | |
1343 | jermar | 160 | /** Send a fast answer to a received call. |
161 | * |
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162 | * The fast answer makes use of passing retval and first two arguments in registers. |
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163 | * If you need to return more, use the ipc_answer() instead. |
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164 | * |
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165 | * @param callid ID of the call being answered. |
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166 | * @param retval Return value. |
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167 | * @param arg1 First return argument. |
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168 | * @param arg2 Second return argument. |
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169 | * |
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170 | * @return Zero on success or a value from @ref errno.h on failure. |
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171 | */ |
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172 | ipcarg_t ipc_answer_fast(ipc_callid_t callid, ipcarg_t retval, ipcarg_t arg1, |
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999 | palkovsky | 173 | ipcarg_t arg2) |
954 | palkovsky | 174 | { |
1330 | palkovsky | 175 | return __SYSCALL4(SYS_IPC_ANSWER_FAST, callid, retval, arg1, arg2); |
954 | palkovsky | 176 | } |
177 | |||
1343 | jermar | 178 | /** Send a full answer to a received call. |
179 | * |
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180 | * @param callid ID of the call being answered. |
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181 | * @param call Call data. Must be already initialized by the responder. |
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182 | * |
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183 | * @return Zero on success or a value from @ref errno.h on failure. |
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184 | */ |
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185 | ipcarg_t ipc_answer(ipc_callid_t callid, ipc_call_t *call) |
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186 | { |
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187 | return __SYSCALL2(SYS_IPC_ANSWER, callid, (sysarg_t) call); |
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188 | } |
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189 | |||
190 | |||
999 | palkovsky | 191 | /** Try to dispatch queed calls from async queue */ |
192 | static void try_dispatch_queued_calls(void) |
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193 | { |
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194 | async_call_t *call; |
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195 | ipc_callid_t callid; |
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196 | |||
1350 | palkovsky | 197 | futex_down(&ipc_futex); |
999 | palkovsky | 198 | while (!list_empty(&queued_calls)) { |
199 | call = list_get_instance(queued_calls.next, async_call_t, |
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200 | list); |
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201 | |||
202 | callid = _ipc_call_async(call->u.msg.phoneid, |
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203 | &call->u.msg.data); |
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204 | if (callid == IPC_CALLRET_TEMPORARY) |
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205 | break; |
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206 | list_remove(&call->list); |
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1350 | palkovsky | 207 | |
999 | palkovsky | 208 | if (callid == IPC_CALLRET_FATAL) { |
1350 | palkovsky | 209 | futex_up(&ipc_futex); |
1443 | palkovsky | 210 | if (call->callback) |
211 | call->callback(call->private, ENOENT, NULL); |
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999 | palkovsky | 212 | free(call); |
1350 | palkovsky | 213 | futex_down(&ipc_futex); |
999 | palkovsky | 214 | } else { |
215 | call->u.callid = callid; |
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216 | list_append(&call->list, &dispatched_calls); |
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217 | } |
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218 | } |
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1350 | palkovsky | 219 | futex_up(&ipc_futex); |
999 | palkovsky | 220 | } |
221 | |||
222 | /** Handle received answer |
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223 | * |
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224 | * TODO: Make it use hash table |
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225 | * |
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226 | * @param callid Callid (with first bit set) of the answered call |
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227 | */ |
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1091 | palkovsky | 228 | static void handle_answer(ipc_callid_t callid, ipc_call_t *data) |
999 | palkovsky | 229 | { |
230 | link_t *item; |
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231 | async_call_t *call; |
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232 | |||
233 | callid &= ~IPC_CALLID_ANSWERED; |
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234 | |||
1350 | palkovsky | 235 | futex_down(&ipc_futex); |
999 | palkovsky | 236 | for (item = dispatched_calls.next; item != &dispatched_calls; |
237 | item = item->next) { |
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238 | call = list_get_instance(item, async_call_t, list); |
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239 | if (call->u.callid == callid) { |
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240 | list_remove(&call->list); |
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1350 | palkovsky | 241 | futex_up(&ipc_futex); |
1443 | palkovsky | 242 | if (call->callback) |
243 | call->callback(call->private, |
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244 | IPC_GET_RETVAL(*data), |
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245 | data); |
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246 | free(call); |
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999 | palkovsky | 247 | return; |
248 | } |
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249 | } |
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1350 | palkovsky | 250 | futex_up(&ipc_futex); |
999 | palkovsky | 251 | printf("Received unidentified answer: %P!!!\n", callid); |
252 | } |
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253 | |||
254 | |||
1392 | palkovsky | 255 | /** One cycle of ipc wait for call call |
954 | palkovsky | 256 | * |
257 | * - dispatch ASYNC reoutines in the background |
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1365 | jermar | 258 | * @param call Space where the message is stored |
1392 | palkovsky | 259 | * @param usec Timeout in microseconds |
260 | * @param flags Flags passed to SYS_IPC_WAIT (blocking, nonblocking) |
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1365 | jermar | 261 | * @return Callid of the answer. |
954 | palkovsky | 262 | */ |
1392 | palkovsky | 263 | ipc_callid_t ipc_wait_cycle(ipc_call_t *call, uint32_t usec, int flags) |
954 | palkovsky | 264 | { |
265 | ipc_callid_t callid; |
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266 | |||
1392 | palkovsky | 267 | try_dispatch_queued_calls(); |
268 | |||
269 | callid = __SYSCALL3(SYS_IPC_WAIT, (sysarg_t) call, usec, flags); |
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270 | /* Handle received answers */ |
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271 | if (callid & IPC_CALLID_ANSWERED) |
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272 | handle_answer(callid, call); |
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999 | palkovsky | 273 | |
954 | palkovsky | 274 | return callid; |
275 | } |
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1028 | palkovsky | 276 | |
1365 | jermar | 277 | /** Wait some time for an IPC call. |
278 | * |
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279 | * - dispatch ASYNC reoutines in the background |
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280 | * @param call Space where the message is stored |
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281 | * @param usec Timeout in microseconds. |
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282 | * @return Callid of the answer. |
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283 | */ |
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284 | ipc_callid_t ipc_wait_for_call_timeout(ipc_call_t *call, uint32_t usec) |
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285 | { |
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286 | ipc_callid_t callid; |
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287 | |||
288 | do { |
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1392 | palkovsky | 289 | callid = ipc_wait_cycle(call, usec, SYNCH_BLOCKING); |
1365 | jermar | 290 | } while (callid & IPC_CALLID_ANSWERED); |
291 | |||
292 | return callid; |
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293 | } |
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294 | |||
295 | /** Check if there is an IPC call waiting to be picked up. |
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296 | * |
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297 | * - dispatch ASYNC reoutines in the background |
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298 | * @param call Space where the message is stored |
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299 | * @return Callid of the answer. |
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300 | */ |
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301 | ipc_callid_t ipc_trywait_for_call(ipc_call_t *call) |
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302 | { |
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303 | ipc_callid_t callid; |
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304 | |||
305 | do { |
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1392 | palkovsky | 306 | callid = ipc_wait_cycle(call, SYNCH_NO_TIMEOUT, SYNCH_NON_BLOCKING); |
1365 | jermar | 307 | } while (callid & IPC_CALLID_ANSWERED); |
308 | |||
309 | return callid; |
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310 | } |
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311 | |||
1091 | palkovsky | 312 | /** Ask destination to do a callback connection |
313 | * |
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314 | * @return 0 - OK, error code |
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315 | */ |
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316 | int ipc_connect_to_me(int phoneid, int arg1, int arg2, ipcarg_t *phone) |
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1028 | palkovsky | 317 | { |
1091 | palkovsky | 318 | return ipc_call_sync_3(phoneid, IPC_M_CONNECT_TO_ME, arg1, |
319 | arg2, 0, 0, 0, phone); |
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1028 | palkovsky | 320 | } |
1061 | palkovsky | 321 | |
1091 | palkovsky | 322 | /** Ask through phone for a new connection to some service |
323 | * |
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324 | * @return new phoneid - OK, error code |
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325 | */ |
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1061 | palkovsky | 326 | int ipc_connect_me_to(int phoneid, int arg1, int arg2) |
327 | { |
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1092 | palkovsky | 328 | ipcarg_t newphid; |
1091 | palkovsky | 329 | int res; |
330 | |||
331 | res = ipc_call_sync_3(phoneid, IPC_M_CONNECT_ME_TO, arg1, |
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332 | arg2, 0, 0, 0, &newphid); |
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333 | if (res) |
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334 | return res; |
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335 | return newphid; |
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1061 | palkovsky | 336 | } |
337 | |||
1089 | palkovsky | 338 | /* Hang up specified phone */ |
339 | int ipc_hangup(int phoneid) |
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340 | { |
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341 | return __SYSCALL1(SYS_IPC_HANGUP, phoneid); |
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342 | } |
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1259 | palkovsky | 343 | |
1282 | palkovsky | 344 | int ipc_register_irq(int irq, irq_code_t *ucode) |
1259 | palkovsky | 345 | { |
1282 | palkovsky | 346 | return __SYSCALL2(SYS_IPC_REGISTER_IRQ, irq, (sysarg_t) ucode); |
1259 | palkovsky | 347 | } |
348 | |||
349 | int ipc_unregister_irq(int irq) |
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350 | { |
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351 | return __SYSCALL1(SYS_IPC_UNREGISTER_IRQ, irq); |
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352 | } |
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1330 | palkovsky | 353 | |
1336 | jermar | 354 | int ipc_forward_fast(ipc_callid_t callid, int phoneid, int method, ipcarg_t arg1) |
355 | { |
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356 | return __SYSCALL4(SYS_IPC_FORWARD_FAST, callid, phoneid, method, arg1); |
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357 | } |
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358 | |||
1350 | palkovsky | 359 | |
360 | /** Open shared memory connection over specified phoneid |
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361 | * |
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362 | * |
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1360 | jermar | 363 | * Allocate as_area, notify the other side about our intention |
1350 | palkovsky | 364 | * to open the connection |
365 | * |
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366 | * @return Connection id identifying this connection |
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367 | */ |
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368 | //int ipc_dgr_open(int pohoneid, size_t bufsize) |
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369 | //{ |
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370 | /* Find new file descriptor in local descriptor table */ |
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371 | /* Create AS_area, initialize structures */ |
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372 | /* Send AS to other side, handle error states */ |
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373 | |||
374 | //} |
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1330 | palkovsky | 375 | /* |
1350 | palkovsky | 376 | void ipc_dgr_close(int cid) |
1330 | palkovsky | 377 | { |
378 | } |
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379 | |||
1350 | palkovsky | 380 | void * ipc_dgr_alloc(int cid, size_t size) |
381 | { |
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382 | } |
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1330 | palkovsky | 383 | |
1350 | palkovsky | 384 | void ipc_dgr_free(int cid, void *area) |
385 | { |
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386 | |||
387 | } |
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388 | |||
389 | int ipc_dgr_send(int cid, void *area) |
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390 | { |
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391 | } |
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392 | |||
393 | |||
394 | int ipc_dgr_send_data(int cid, void *data, size_t size) |
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395 | { |
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396 | } |
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397 | |||
1330 | palkovsky | 398 | */ |