2011-12-22 16:19:25 +01:00
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/*
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Fiasco.OC: introduce Cap_index (fixes #149, #112)
This commit introduces a Cap_index class for Fiasco.OC's capabilities.
A Cap_index is a combination of the global capability id, that is used by Genode
to correctly identify a kernel-object, and a corresponding entry in a
protection-domain's (kernel-)capability-space. The cap-indices are non-copyable,
unique objects, that are held in a Cap_map. The Cap_map is used to re-find
capabilities already present in the protection-domain, when a capability is
received via IPC. The retrieval of capabilities effectively fixes issue #112,
meaning the waste of capability-space entries.
Because Cap_index objects are non-copyable (their address indicates the position
in the capability-space of the pd), they are inappropriate to use as
Native_capability. Therefore, Native_capability is implemented as a reference
to Cap_index objects. This design seems to be a good pre-condition to implement
smart-pointers for entries in the capability-space, and thereby closing existing
leaks (please refer to issue #32).
Cap_index, Cap_map, and the allocator for Cap_index objects are designed in a way,
that it should be relatively easy to apply the same concept to NOVA also. By now,
these classes are located in the `base-foc` repository, but they intentionally
contain no Fiasco.OC specific elements.
The previously explained changes had extensive impact on the whole Fiasco.OC
platform implementation, due to various dependencies. The following things had to
be changed:
* The Thread object's startup and destruction routine is re-arranged, to
enable another thread (that calls the Thread destructor) gaining the
capability id of the thread's gate to remove it from the Cap_map, the
thread's UTCB had to be made available to the caller, because there
is the current location of that id. After having the UTCB available
in the Thread object for that reason, the whole thread bootstrapping
could be simplified.
* In the course of changing the Native_capability's semantic, a new Cap_mapping
class was introduced in core, that facilitates the establishment and
destruction of capability mappings between core and it's client's, especially
mappings related to Platform_thread and Platform_task, that are relevant to
task and thread creation and destruction. Thereby, the destruction of
threads had to be reworked, which effectively removed a bug (issue #149)
where some threads weren't destroyed properly.
* In the quick fix for issue #112, something similar to the Cap_map was
introduced available in all processes. Moreover, some kind of a capability
map already existed in core, to handle cap-session request properly. The
introduction of the Cap_map unified both structures, so that the
cap-session component code in core had to be reworked too.
* The platform initialization code had to be changed sligthly due to the
changes in Native_capability
* The vcpu initialization in the L4Linux support library had to be adapted
according to the already mentioned changes in the Thread object's bootstrap
code.
2012-03-15 12:41:24 +01:00
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* \brief Fiasco.OC-specific core implementation of IRQ sessions
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2011-12-22 16:19:25 +01:00
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* \author Christian Helmuth
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Fiasco.OC: introduce Cap_index (fixes #149, #112)
This commit introduces a Cap_index class for Fiasco.OC's capabilities.
A Cap_index is a combination of the global capability id, that is used by Genode
to correctly identify a kernel-object, and a corresponding entry in a
protection-domain's (kernel-)capability-space. The cap-indices are non-copyable,
unique objects, that are held in a Cap_map. The Cap_map is used to re-find
capabilities already present in the protection-domain, when a capability is
received via IPC. The retrieval of capabilities effectively fixes issue #112,
meaning the waste of capability-space entries.
Because Cap_index objects are non-copyable (their address indicates the position
in the capability-space of the pd), they are inappropriate to use as
Native_capability. Therefore, Native_capability is implemented as a reference
to Cap_index objects. This design seems to be a good pre-condition to implement
smart-pointers for entries in the capability-space, and thereby closing existing
leaks (please refer to issue #32).
Cap_index, Cap_map, and the allocator for Cap_index objects are designed in a way,
that it should be relatively easy to apply the same concept to NOVA also. By now,
these classes are located in the `base-foc` repository, but they intentionally
contain no Fiasco.OC specific elements.
The previously explained changes had extensive impact on the whole Fiasco.OC
platform implementation, due to various dependencies. The following things had to
be changed:
* The Thread object's startup and destruction routine is re-arranged, to
enable another thread (that calls the Thread destructor) gaining the
capability id of the thread's gate to remove it from the Cap_map, the
thread's UTCB had to be made available to the caller, because there
is the current location of that id. After having the UTCB available
in the Thread object for that reason, the whole thread bootstrapping
could be simplified.
* In the course of changing the Native_capability's semantic, a new Cap_mapping
class was introduced in core, that facilitates the establishment and
destruction of capability mappings between core and it's client's, especially
mappings related to Platform_thread and Platform_task, that are relevant to
task and thread creation and destruction. Thereby, the destruction of
threads had to be reworked, which effectively removed a bug (issue #149)
where some threads weren't destroyed properly.
* In the quick fix for issue #112, something similar to the Cap_map was
introduced available in all processes. Moreover, some kind of a capability
map already existed in core, to handle cap-session request properly. The
introduction of the Cap_map unified both structures, so that the
cap-session component code in core had to be reworked too.
* The platform initialization code had to be changed sligthly due to the
changes in Native_capability
* The vcpu initialization in the L4Linux support library had to be adapted
according to the already mentioned changes in the Thread object's bootstrap
code.
2012-03-15 12:41:24 +01:00
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* \author Stefan Kalkowski
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2012-10-05 14:46:16 +02:00
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* \author Sebastian Sumpf
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2011-12-22 16:19:25 +01:00
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* \date 2007-09-13
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*
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* FIXME ram quota missing
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*/
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/*
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2013-01-10 21:44:47 +01:00
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* Copyright (C) 2007-2013 Genode Labs GmbH
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2011-12-22 16:19:25 +01:00
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <base/printf.h>
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#include <util/arg_string.h>
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/* core includes */
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#include <irq_root.h>
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2012-10-05 14:46:16 +02:00
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#include <irq_proxy_component.h>
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2011-12-22 16:19:25 +01:00
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#include <irq_session_component.h>
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2012-03-16 14:47:41 +01:00
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#include <platform.h>
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2011-12-22 16:19:25 +01:00
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#include <util.h>
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/* Fiasco includes */
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namespace Fiasco {
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#include <l4/sys/icu.h>
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#include <l4/sys/irq.h>
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#include <l4/sys/factory.h>
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#include <l4/sys/types.h>
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}
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using namespace Genode;
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2012-10-05 14:46:16 +02:00
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namespace Genode {
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class Interrupt_handler;
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class Irq_proxy_component;
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}
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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/**
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* Dispatches interrupts from kernel
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*/
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class Genode::Interrupt_handler : public Thread<4096>
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2011-12-22 16:19:25 +01:00
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{
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2012-10-05 14:46:16 +02:00
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private:
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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Interrupt_handler() { start(); }
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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public:
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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void entry();
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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static Native_thread handler_cap()
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{
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static Interrupt_handler handler;
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return handler._thread_cap.dst();
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}
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};
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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/**
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* Irq_proxy interface implementation
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*/
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class Genode::Irq_proxy_component : public Irq_proxy_base
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2011-12-22 16:19:25 +01:00
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{
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2012-10-05 14:46:16 +02:00
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private:
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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Cap_index *_cap;
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Semaphore _sem;
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long _trigger; /* interrupt trigger */
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long _polarity; /* interrupt polarity */
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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Native_thread _capability() const { return _cap->kcap(); }
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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protected:
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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bool _associate()
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{
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using namespace Fiasco;
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if (l4_error(l4_factory_create_irq(L4_BASE_FACTORY_CAP, _capability()))) {
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PERR("l4_factory_create_irq failed!");
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return false;
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}
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if (l4_error(l4_icu_bind(L4_BASE_ICU_CAP, _irq_number, _capability()))) {
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PERR("Binding IRQ%ld to the ICU failed", _irq_number);
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return false;
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2011-12-22 16:19:25 +01:00
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}
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2012-10-05 14:46:16 +02:00
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/* set interrupt mode */
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Platform::setup_irq_mode(_irq_number, _trigger, _polarity);
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if (l4_error(l4_irq_attach(_capability(), _irq_number,
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Interrupt_handler::handler_cap()))) {
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PERR("Error attaching to IRQ %ld", _irq_number);
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return false;
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}
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return true;
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2011-12-22 16:19:25 +01:00
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}
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2012-10-05 14:46:16 +02:00
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void _wait_for_irq()
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{
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using namespace Fiasco;
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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int err;
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l4_msgtag_t tag = l4_irq_unmask(_capability());
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if ((err = l4_ipc_error(tag, l4_utcb())))
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PERR("IRQ unmask: %d\n", err);
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_sem.down();
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}
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void _ack_irq() { }
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public:
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Irq_proxy_component(long irq_number)
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:
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Irq_proxy_base(irq_number),
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_cap(cap_map()->insert(platform_specific()->cap_id_alloc()->alloc())),
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_sem(), _trigger(-1), _polarity(-1) { }
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Semaphore *semaphore() { return &_sem; }
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void start(long trigger, long polarity)
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{
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_trigger = trigger;
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_polarity = polarity;
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_start();
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}
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bool match_mode(long trigger, long polarity)
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{
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if (trigger == Irq_session::TRIGGER_UNCHANGED &&
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polarity == Irq_session::POLARITY_UNCHANGED)
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return true;
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if (_trigger < 0 && _polarity < 0)
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return true;
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return _trigger == trigger && _polarity == polarity;
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}
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long trigger() const { return _trigger; }
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long polarity() const { return _polarity; }
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};
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/********************************
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** IRQ session implementation **
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********************************/
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2011-12-22 16:19:25 +01:00
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Irq_session_component::Irq_session_component(Cap_session *cap_session,
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Range_allocator *irq_alloc,
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const char *args)
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:
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2012-10-05 14:46:16 +02:00
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_ep(cap_session, STACK_SIZE, "irqctrl"),
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_proxy(0)
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2011-12-22 16:19:25 +01:00
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{
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using namespace Fiasco;
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long irq_number = Arg_string::find_arg(args, "irq_number").long_value(-1);
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2012-10-05 14:46:16 +02:00
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if (irq_number == -1) {
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2011-12-22 16:19:25 +01:00
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PERR("Unavailable IRQ %lx requested", irq_number);
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throw Root::Invalid_args();
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}
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2012-10-05 14:46:16 +02:00
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long irq_trigger = Arg_string::find_arg(args, "irq_trigger").long_value(-1);
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irq_trigger = irq_trigger == -1 ? 0 : irq_trigger;
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long irq_polarity = Arg_string::find_arg(args, "irq_polarity").long_value(-1);
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irq_polarity = irq_polarity == -1 ? 0 : irq_polarity;
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2011-12-22 16:19:25 +01:00
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/*
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* temorary hack for fiasco.oc using the local-apic,
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* where old pic-line 0 maps to 2
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*/
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if (irq_number == 0)
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irq_number = 2;
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2012-10-05 14:46:16 +02:00
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if (!(_proxy = Irq_proxy_component::get_irq_proxy<Irq_proxy_component>(irq_number,
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irq_alloc))) {
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PERR("No proxy for IRQ %lu found", irq_number);
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throw Root::Unavailable();
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}
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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/* sanity check */
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if (!_proxy->match_mode(irq_trigger, irq_polarity)) {
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PERR("Interrupt mode mismatch: IRQ %ld current mode: t: %ld p: %ld"
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"request mode: trg: %ld p: %ld",
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irq_number, _proxy->trigger(), _proxy->polarity(),
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irq_trigger, irq_polarity);
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throw Root::Unavailable();
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}
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2011-12-22 16:19:25 +01:00
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2012-10-05 14:46:16 +02:00
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/* set interrupt mode and start proxy */
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_proxy->start(irq_trigger, irq_polarity);
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2012-03-16 14:47:41 +01:00
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2012-10-05 14:46:16 +02:00
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if (!_proxy->add_sharer())
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throw Root::Unavailable();
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2011-12-22 16:19:25 +01:00
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/* initialize capability */
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_irq_cap = _ep.manage(this);
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}
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void Irq_session_component::wait_for_irq()
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{
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2012-10-05 14:46:16 +02:00
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_proxy->wait_for_irq();
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2011-12-22 16:19:25 +01:00
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}
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Irq_session_component::~Irq_session_component()
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{
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PERR("Implement me, immediately!");
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}
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2012-10-05 14:46:16 +02:00
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/***************************************
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** Interrupt handler implemtentation **
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***************************************/
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void Interrupt_handler::entry()
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{
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using namespace Fiasco;
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int err;
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l4_msgtag_t tag;
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l4_umword_t label;
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while (true) {
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tag = l4_ipc_wait(l4_utcb(), &label, L4_IPC_NEVER);
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if ((err = l4_ipc_error(tag, l4_utcb())))
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PERR("IRQ receive: %d\n", err);
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else {
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Irq_proxy_component *proxy;
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proxy = Irq_proxy_component::get_irq_proxy<Irq_proxy_component>(label);
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if (proxy)
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proxy->semaphore()->up();
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}
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}
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}
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