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954 palkovsky 1
/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <ipc.h>
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#include <libc.h>
999 palkovsky 31
#include <malloc.h>
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#include <errno.h>
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#include <list.h>
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#include <stdio.h>
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#include <unistd.h>
954 palkovsky 36
 
999 palkovsky 37
/** Structure used for keeping track of sent async msgs
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 * and queing unsent msgs
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 *
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 */
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typedef struct {
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    link_t list;
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    ipc_async_callback_t callback;
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    void *private;
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    union {
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        ipc_callid_t callid;
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        struct {
1091 palkovsky 49
            ipc_call_t data;
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            int phoneid;
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        } msg;
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    }u;
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} async_call_t;
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LIST_INITIALIZE(dispatched_calls);
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LIST_INITIALIZE(queued_calls);
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int ipc_call_sync(int phoneid, ipcarg_t method, ipcarg_t arg1,
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          ipcarg_t *result)
954 palkovsky 60
{
1091 palkovsky 61
    ipc_call_t resdata;
966 palkovsky 62
    int callres;
63
 
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    callres = __SYSCALL4(SYS_IPC_CALL_SYNC_FAST, phoneid, method, arg1,
966 palkovsky 65
                 (sysarg_t)&resdata);
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    if (callres)
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        return callres;
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    if (result)
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        *result = IPC_GET_ARG1(resdata);
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    return IPC_GET_RETVAL(resdata);
954 palkovsky 71
}
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999 palkovsky 73
int ipc_call_sync_3(int phoneid, ipcarg_t method, ipcarg_t arg1,
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            ipcarg_t arg2, ipcarg_t arg3,
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            ipcarg_t *result1, ipcarg_t *result2, ipcarg_t *result3)
954 palkovsky 76
{
1091 palkovsky 77
    ipc_call_t data;
966 palkovsky 78
    int callres;
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80
    IPC_SET_METHOD(data, method);
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    IPC_SET_ARG1(data, arg1);
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    IPC_SET_ARG2(data, arg2);
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    IPC_SET_ARG3(data, arg3);
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1006 palkovsky 85
    callres = __SYSCALL3(SYS_IPC_CALL_SYNC, phoneid, (sysarg_t)&data,
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                 (sysarg_t)&data);
966 palkovsky 87
    if (callres)
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        return callres;
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90
    if (result1)
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        *result1 = IPC_GET_ARG1(data);
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    if (result2)
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        *result2 = IPC_GET_ARG2(data);
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    if (result3)
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        *result3 = IPC_GET_ARG3(data);
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    return IPC_GET_RETVAL(data);
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}
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999 palkovsky 99
/** Syscall to send asynchronous message */
1091 palkovsky 100
static  ipc_callid_t _ipc_call_async(int phoneid, ipc_call_t *data)
999 palkovsky 101
{
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    return __SYSCALL2(SYS_IPC_CALL_ASYNC, phoneid, (sysarg_t)data);
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}
104
 
966 palkovsky 105
/** Send asynchronous message
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 *
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 * - if fatal error, call callback handler with proper error code
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 * - if message cannot be temporarily sent, add to queue
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 */
999 palkovsky 110
void ipc_call_async_2(int phoneid, ipcarg_t method, ipcarg_t arg1,
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              ipcarg_t arg2, void *private,
966 palkovsky 112
              ipc_async_callback_t callback)
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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));
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    if (!call) {
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        callback(private, ENOMEM, NULL);
1028 palkovsky 120
        return;
999 palkovsky 121
    }
122
 
123
    callid = __SYSCALL4(SYS_IPC_CALL_ASYNC_FAST, phoneid, method, arg1, arg2);
966 palkovsky 124
    if (callid == IPC_CALLRET_FATAL) {
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        /* Call asynchronous handler with error code */
999 palkovsky 126
        callback(private, ENOENT, NULL);
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        free(call);
966 palkovsky 128
        return;
129
    }
999 palkovsky 130
 
131
    call->callback = callback;
132
    call->private = private;
133
 
966 palkovsky 134
    if (callid == IPC_CALLRET_TEMPORARY) {
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        /* Add asynchronous call to queue of non-dispatched async calls */
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        call->u.msg.phoneid = phoneid;
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        IPC_SET_METHOD(call->u.msg.data, method);
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        IPC_SET_ARG1(call->u.msg.data, arg1);
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        IPC_SET_ARG2(call->u.msg.data, arg2);
140
 
141
        list_append(&call->list, &queued_calls);
966 palkovsky 142
        return;
143
    }
999 palkovsky 144
    call->u.callid = callid;
145
    /* Add call to list of dispatched calls */
146
    list_append(&call->list, &dispatched_calls);
954 palkovsky 147
}
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966 palkovsky 149
 
150
/** Send answer to a received call */
999 palkovsky 151
void ipc_answer(ipc_callid_t callid, ipcarg_t retval, ipcarg_t arg1,
152
        ipcarg_t arg2)
954 palkovsky 153
{
1006 palkovsky 154
    __SYSCALL4(SYS_IPC_ANSWER_FAST, callid, retval, arg1, arg2);
954 palkovsky 155
}
156
 
999 palkovsky 157
/** Try to dispatch queed calls from async queue */
158
static void try_dispatch_queued_calls(void)
159
{
160
    async_call_t *call;
161
    ipc_callid_t callid;
162
 
163
    while (!list_empty(&queued_calls)) {
164
        call = list_get_instance(queued_calls.next, async_call_t,
165
                     list);
166
 
167
        callid = _ipc_call_async(call->u.msg.phoneid,
168
                     &call->u.msg.data);
169
        if (callid == IPC_CALLRET_TEMPORARY)
170
            break;
171
        list_remove(&call->list);
172
        if (callid == IPC_CALLRET_FATAL) {
173
            call->callback(call->private, ENOENT, NULL);
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            free(call);
175
        } else {
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            call->u.callid = callid;
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            list_append(&call->list, &dispatched_calls);
178
        }
179
    }
180
}
181
 
182
/** Handle received answer
183
 *
184
 * TODO: Make it use hash table
185
 *
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 * @param callid Callid (with first bit set) of the answered call
187
 */
1091 palkovsky 188
static void handle_answer(ipc_callid_t callid, ipc_call_t *data)
999 palkovsky 189
{
190
    link_t *item;
191
    async_call_t *call;
192
 
193
    callid &= ~IPC_CALLID_ANSWERED;
194
 
195
    for (item = dispatched_calls.next; item != &dispatched_calls;
196
         item = item->next) {
197
        call = list_get_instance(item, async_call_t, list);
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        if (call->u.callid == callid) {
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            list_remove(&call->list);
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            call->callback(call->private,
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                       IPC_GET_RETVAL(*data),
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                       data);
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            return;
204
        }
205
    }
206
    printf("Received unidentified answer: %P!!!\n", callid);
207
}
208
 
209
 
954 palkovsky 210
/** Wait for IPC call and return
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 *
212
 * - dispatch ASYNC reoutines in the background
999 palkovsky 213
 * @param data Space where the message is stored
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 * @return Callid or 0 if nothing available and started with
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 *         IPC_WAIT_NONBLOCKING
954 palkovsky 216
 */
1028 palkovsky 217
ipc_callid_t ipc_wait_for_call(ipc_call_t *call, int flags)
954 palkovsky 218
{
219
    ipc_callid_t callid;
220
 
966 palkovsky 221
    do {
999 palkovsky 222
        try_dispatch_queued_calls();
223
 
1091 palkovsky 224
        callid = __SYSCALL2(SYS_IPC_WAIT, (sysarg_t)call, flags);
999 palkovsky 225
        /* Handle received answers */
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        if (callid & IPC_CALLID_ANSWERED)
1091 palkovsky 227
            handle_answer(callid, call);
966 palkovsky 228
    } while (callid & IPC_CALLID_ANSWERED);
999 palkovsky 229
 
954 palkovsky 230
    return callid;
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}
1028 palkovsky 232
 
1091 palkovsky 233
/** Ask destination to do a callback connection
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 *
235
 * @return 0 - OK, error code
236
 */
237
int ipc_connect_to_me(int phoneid, int arg1, int arg2, ipcarg_t *phone)
1028 palkovsky 238
{
1091 palkovsky 239
    return ipc_call_sync_3(phoneid, IPC_M_CONNECT_TO_ME, arg1,
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                   arg2, 0, 0, 0, phone);
1028 palkovsky 241
}
1061 palkovsky 242
 
1091 palkovsky 243
/** Ask through phone for a new connection to some service
244
 *
245
 * @return new phoneid - OK, error code
246
 */
1061 palkovsky 247
int ipc_connect_me_to(int phoneid, int arg1, int arg2)
248
{
1092 palkovsky 249
    ipcarg_t newphid;
1091 palkovsky 250
    int res;
251
 
252
    res =  ipc_call_sync_3(phoneid, IPC_M_CONNECT_ME_TO, arg1,
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                   arg2, 0, 0, 0, &newphid);
254
    if (res)
255
        return res;
256
    return newphid;
1061 palkovsky 257
}
258
 
1089 palkovsky 259
/* Hang up specified phone */
260
int ipc_hangup(int phoneid)
261
{
262
    return __SYSCALL1(SYS_IPC_HANGUP, phoneid);
263
}
1259 palkovsky 264
 
265
int ipc_register_irq(int irq)
266
{
267
    return __SYSCALL1(SYS_IPC_REGISTER_IRQ, irq);
268
}
269
 
270
int ipc_unregister_irq(int irq)
271
{
272
    return __SYSCALL1(SYS_IPC_UNREGISTER_IRQ, irq);
273
}