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core: handle IRQ sessions by separate entrypoint 

Fixes #1572
This commit is contained in:
Norman Feske 2015-06-09 12:42:39 +02:00 committed by Christian Helmuth
parent 52110b9d89
commit 4f927f651b
2 changed files with 22 additions and 9 deletions
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28
repos/base/src/core/include/irq_root.h
View File

@ -25,7 +25,17 @@ class Genode::Irq_root : public Root_component<Irq_session_component>
private:
Range_allocator *_irq_alloc; /* platform irq allocator */
/*
* Use a dedicated entrypoint for IRQ session to decouple the interrupt
* handling from other core services. If we used the same entrypoint, a
* long-running operation (like allocating and clearing a dataspace
* from the RAM service) would delay the response to time-critical
* calls of the 'Irq_session::ack_irq' function.
*/
enum { STACK_SIZE = sizeof(long)*1024 };
Rpc_entrypoint _session_ep;
Range_allocator *_irq_alloc; /* platform irq allocator */
protected:
@ -37,15 +47,17 @@ class Genode::Irq_root : public Root_component<Irq_session_component>
/**
* Constructor
*
* \param session_ep entry point for managing irq session objects
* \param irq_alloc IRQ range that can be assigned to clients
* \param md_alloc meta-data allocator to be used by root component
* \param cap_session capability allocator
* \param irq_alloc IRQ range that can be assigned to clients
* \param md_alloc meta-data allocator to be used by root component
*/
Irq_root(Rpc_entrypoint *session_ep, Range_allocator *irq_alloc,
Allocator *md_alloc)
Irq_root(Cap_session *cap_session,
Range_allocator *irq_alloc, Allocator *md_alloc)
:
Root_component<Irq_session_component>(session_ep, md_alloc),
_irq_alloc(irq_alloc) { }
Root_component<Irq_session_component>(&_session_ep, md_alloc),
_session_ep(cap_session, STACK_SIZE, "irq"),
_irq_alloc(irq_alloc)
{ }
};
#endif /* _CORE__INCLUDE__IRQ_ROOT_H_ */

3
repos/base/src/core/main.cc
View File

@ -224,7 +224,8 @@ int main()
static Log_root log_root (e, &sliced_heap);
static Io_mem_root io_mem_root (e, e, platform()->io_mem_alloc(),
platform()->ram_alloc(), &sliced_heap);
static Irq_root irq_root (e, platform()->irq_alloc(), &sliced_heap);
static Irq_root irq_root (core_env()->cap_session(),
platform()->irq_alloc(), &sliced_heap);
static Trace::Root trace_root (e, &sliced_heap, trace_sources, trace_policies);
/*