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sel4: receive-sel handling for early IPC

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This commit is contained in:
Norman Feske 2015-05-13 11:22:14 +02:00 committed by Christian Helmuth
parent 3259185bfc
commit 06d143d51f
1 changed files with 29 additions and 7 deletions
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36
repos/base-sel4/src/base/ipc/ipc.cc
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@ -38,6 +38,26 @@ enum {
};
/**
* Return reference to receive selector of the calling thread
*/
static unsigned &rcv_sel()
{
/*
* When the function is called at the very early initialization phase,
* we cannot access Thread_base::myself()->tid() because the Thread_base
* object of the main thread does not exist yet. During this phase, we
* return a reference to the 'main_rcv_sel' variable.
*/
if (Thread_base::myself()) {
return Thread_base::myself()->tid().rcv_sel;
}
static unsigned main_rcv_sel = Capability_space::alloc_rcv_sel();
return main_rcv_sel;
}
/**
* Convert Genode::Msgbuf_base content into seL4 message
*
@ -77,10 +97,9 @@ static seL4_MessageInfo_t new_seL4_message(Msgbuf_base &msg,
/*
* Allocate and define receive selector
*/
Native_thread &thread = Thread_base::myself()->tid();
if (!thread.rcv_sel)
thread.rcv_sel = Capability_space::alloc_rcv_sel();
if (!rcv_sel())
rcv_sel() = Capability_space::alloc_rcv_sel();
/*
* Supply data payload
@ -174,7 +193,7 @@ static void decode_seL4_message(umword_t badge,
ASSERT(delegated);
Native_thread &thread = Thread_base::myself()->tid();
ASSERT(delegated);
Native_capability arg_cap = Capability_space::lookup(rpc_obj_key);
@ -189,14 +208,14 @@ static void decode_seL4_message(umword_t badge,
* Unfortunaltely, seL4 lacks such a comparison operation.
*/
Capability_space::reset_sel(thread.rcv_sel);
Capability_space::reset_sel(rcv_sel());
dst_msg.append_cap(arg_cap);
} else {
Capability_space::Ipc_cap_data const
ipc_cap_data(rpc_obj_key, thread.rcv_sel);
ipc_cap_data(rpc_obj_key, rcv_sel());
dst_msg.append_cap(Capability_space::import(ipc_cap_data));
@ -204,7 +223,7 @@ static void decode_seL4_message(umword_t badge,
* Since we keep using the received selector, we need to
* allocate a fresh one for the next incoming delegation.
*/
thread.rcv_sel = Capability_space::alloc_rcv_sel();
rcv_sel() = Capability_space::alloc_rcv_sel();
}
}
curr_sel4_cap_idx++;
@ -295,6 +314,9 @@ void Ipc_client::_call()
kernel_debugger_panic("IPC destination is invalid");
}
if (!rcv_sel())
rcv_sel() = Capability_space::alloc_rcv_sel();
seL4_MessageInfo_t const request_msg_info =
new_seL4_message(*_snd_msg, _write_offset);