2013-05-18 10:03:48 +02:00
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/*
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* \brief MMIO framework utility
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* \author Martin Stein
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* \date 2013-05-17
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*/
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/*
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2017-02-20 13:23:52 +01:00
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* Copyright (C) 2013-2017 Genode Labs GmbH
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2013-05-18 10:03:48 +02:00
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*
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* This file is part of the Genode OS framework, which is distributed
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2017-02-20 13:23:52 +01:00
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* under the terms of the GNU Affero General Public License version 3.
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2013-05-18 10:03:48 +02:00
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*/
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#ifndef _INCLUDE__OS__ATTACHED_MMIO_H_
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#define _INCLUDE__OS__ATTACHED_MMIO_H_
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/* Genode includes */
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2017-01-30 11:35:12 +01:00
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#include <base/attached_io_mem_dataspace.h>
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2013-05-18 10:03:48 +02:00
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#include <util/mmio.h>
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2015-03-04 21:12:14 +01:00
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namespace Genode { class Attached_mmio; }
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/**
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* Eases the application of the MMIO framework
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*
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* In the classical case the user wants device memory to be structured
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* by inheriting from Genode::Mmio and using its subclasses. As
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* prerequisite one needs to alloc the IO dataspace, attach it locally
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* and cast the received address. This helper undertakes all of this
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* generic work when inheriting from it.
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*/
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class Genode::Attached_mmio : public Attached_io_mem_dataspace,
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public Mmio
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2013-05-18 10:03:48 +02:00
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{
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2015-03-04 21:12:14 +01:00
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public:
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/**
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* Constructor
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*
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* \param base base address of memory-mapped I/O resource
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* \param size size of resource
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* \param write_combined enable write combining for the resource
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*
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Streamline exception types
This patch reduces the number of exception types by facilitating
globally defined exceptions for common usage patterns shared by most
services. In particular, RPC functions that demand a session-resource
upgrade not longer reflect this condition via a session-specific
exception but via the 'Out_of_ram' or 'Out_of_caps' types.
Furthermore, the 'Parent::Service_denied', 'Parent::Unavailable',
'Root::Invalid_args', 'Root::Unavailable', 'Service::Invalid_args',
'Service::Unavailable', and 'Local_service::Factory::Denied' types have
been replaced by the single 'Service_denied' exception type defined in
'session/session.h'.
This consolidation eases the error handling (there are fewer exceptions
to handle), alleviates the need to convert exceptions along the
session-creation call chain, and avoids possible aliasing problems
(catching the wrong type with the same name but living in a different
scope).
2017-05-07 22:03:22 +02:00
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* \throw Service_denied
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2017-05-08 14:32:03 +02:00
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* \throw Insufficient_ram_quota
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Capability quota accounting and trading
This patch mirrors the accounting and trading scheme that Genode employs
for physical memory to the accounting of capability allocations.
Capability quotas must now be explicitly assigned to subsystems by
specifying a 'caps=<amount>' attribute to init's start nodes.
Analogously to RAM quotas, cap quotas can be traded between clients and
servers as part of the session protocol. The capability budget of each
component is maintained by the component's corresponding PD session at
core.
At the current stage, the accounting is applied to RPC capabilities,
signal-context capabilities, and dataspace capabilities. Capabilities
that are dynamically allocated via core's CPU and TRACE service are not
yet covered. Also, the capabilities allocated by resource multiplexers
outside of core (like nitpicker) must be accounted by the respective
servers, which is not covered yet.
If a component runs out of capabilities, core's PD service prints a
warning to the log. To observe the consumption of capabilities per
component in detail, the PD service is equipped with a diagnostic
mode, which can be enabled via the 'diag' attribute in the target
node of init's routing rules. E.g., the following route enables the
diagnostic mode for the PD session of the "timer" component:
<default-route>
<service name="PD" unscoped_label="timer">
<parent diag="yes"/>
</service>
...
</default-route>
For subsystems based on a sub-init instance, init can be configured
to report the capability-quota information of its subsystems by
adding the attribute 'child_caps="yes"' to init's '<report>'
config node. Init's own capability quota can be reported by adding
the attribute 'init_caps="yes"'.
Fixes #2398
2017-05-08 21:35:43 +02:00
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* \throw Insufficient_cap_quota
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* \throw Out_of_ram
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* \throw Out_of_caps
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Streamline exception types
This patch reduces the number of exception types by facilitating
globally defined exceptions for common usage patterns shared by most
services. In particular, RPC functions that demand a session-resource
upgrade not longer reflect this condition via a session-specific
exception but via the 'Out_of_ram' or 'Out_of_caps' types.
Furthermore, the 'Parent::Service_denied', 'Parent::Unavailable',
'Root::Invalid_args', 'Root::Unavailable', 'Service::Invalid_args',
'Service::Unavailable', and 'Local_service::Factory::Denied' types have
been replaced by the single 'Service_denied' exception type defined in
'session/session.h'.
This consolidation eases the error handling (there are fewer exceptions
to handle), alleviates the need to convert exceptions along the
session-creation call chain, and avoids possible aliasing problems
(catching the wrong type with the same name but living in a different
scope).
2017-05-07 22:03:22 +02:00
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* \throw Region_map::Region_conflict
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2015-03-04 21:12:14 +01:00
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*/
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2017-01-02 14:51:01 +01:00
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Attached_mmio(Env &env, addr_t base, size_t size,
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bool write_combined = false)
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: Attached_io_mem_dataspace(env, base, size, write_combined),
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Mmio((addr_t)local_addr<void>()) { }
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2015-03-04 21:12:14 +01:00
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};
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2013-05-18 10:03:48 +02:00
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#endif /* _INCLUDE__OS__ATTACHED_MMIO_H_ */
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