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static void _ipc_call_init(call_t *call)
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static void _ipc_call_init(call_t *call)
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{
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{
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    memsetb((uintptr_t) call, sizeof(*call), 0);
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    memsetb((uintptr_t) call, sizeof(*call), 0);
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    call->callerbox = &TASK->answerbox;
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    call->callerbox = &TASK->answerbox;
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    call->sender = TASK;
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    call->sender = TASK;
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    call->buffer = NULL;
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}
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}
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/** Allocate and initialize a call structure.
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/** Allocate and initialize a call structure.
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 *
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 *
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 * The call is initialized, so that the reply will be directed to
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 * The call is initialized, so that the reply will be directed to
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 * @param call      Call structure to be freed.
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 * @param call      Call structure to be freed.
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 */
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 */
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void ipc_call_free(call_t *call)
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void ipc_call_free(call_t *call)
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{
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{
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    ASSERT(!(call->flags & IPC_CALL_STATIC_ALLOC));
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    ASSERT(!(call->flags & IPC_CALL_STATIC_ALLOC));
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    /* Check to see if we have data in the IPC_M_DATA_SEND buffer. */
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    if (call->buffer)
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        free(call->buffer);
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    slab_free(ipc_call_slab, call);
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    slab_free(ipc_call_slab, call);
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}
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}
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/** Initialize an answerbox structure.
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/** Initialize an answerbox structure.
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 *
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 *
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{
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{
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    answerbox_t *box;
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    answerbox_t *box;
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    call_t *call;
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    call_t *call;
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    spinlock_lock(&phone->lock);
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    spinlock_lock(&phone->lock);
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    if (phone->state == IPC_PHONE_FREE ||
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    if (phone->state == IPC_PHONE_FREE || phone->state == IPC_PHONE_HUNGUP ||
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        phone->state == IPC_PHONE_HUNGUP ||
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        phone->state == IPC_PHONE_CONNECTING) {
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        phone->state == IPC_PHONE_CONNECTING) {
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        spinlock_unlock(&phone->lock);
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        spinlock_unlock(&phone->lock);
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        return -1;
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        return -1;
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    }
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    }
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    box = phone->callee;
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    box = phone->callee;