142 lines
4.3 KiB
C++
142 lines
4.3 KiB
C++
/*
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* \brief Platform environment of Genode process
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* \author Norman Feske
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* \author Christian Helmuth
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* \date 2006-07-28
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*
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* This file is a generic variant of the platform environment, which is
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* suitable for platforms such as L4ka::Pistachio and L4/Fiasco. On other
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* platforms, it may be replaced by a platform-specific version residing
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* in the corresponding 'base-<platform>' repository.
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*/
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/*
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* Copyright (C) 2006-2017 Genode Labs GmbH
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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 Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__BASE__INTERNAL__PLATFORM_ENV_H_
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#define _INCLUDE__BASE__INTERNAL__PLATFORM_ENV_H_
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/* Genode includes */
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#include <base/log.h>
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#include <base/env.h>
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#include <base/heap.h>
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/* base-internal includes */
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#include <base/internal/globals.h>
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#include <base/internal/parent_cap.h>
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#include <base/internal/attached_stack_area.h>
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#include <base/internal/expanding_cpu_session_client.h>
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#include <base/internal/expanding_region_map_client.h>
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#include <base/internal/expanding_ram_session_client.h>
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#include <base/internal/expanding_parent_client.h>
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namespace Genode { class Platform_env; }
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class Genode::Platform_env : public Env_deprecated,
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public Expanding_parent_client::Emergency_ram_reserve
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{
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private:
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Expanding_parent_client _parent_client;
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struct Resources
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{
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template <typename T>
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Capability<T> request(Parent &parent, Parent::Client::Id id)
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{
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return static_cap_cast<T>(parent.session_cap(id));
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}
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Expanding_ram_session_client ram;
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Expanding_cpu_session_client cpu;
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Pd_session_client pd;
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Expanding_region_map_client rm;
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Resources(Parent &parent)
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:
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ram(request<Ram_session>(parent, Parent::Env::ram()),
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Parent::Env::ram()),
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cpu(request<Cpu_session>(parent, Parent::Env::cpu()),
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Parent::Env::cpu()),
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pd (request<Pd_session> (parent, Parent::Env::pd())),
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rm (pd, pd.address_space(), Parent::Env::pd())
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{ }
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};
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Resources _resources;
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Heap _heap;
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/*
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* The '_heap' must be initialized before the '_stack_area'
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* because the 'Local_parent' performs a dynamic memory allocation
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* due to the creation of the stack area's sub-RM session.
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*/
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Attached_stack_area _stack_area { _parent_client, _resources.pd };
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/*
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* Emergency RAM reserve
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*
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* See the comment of '_fallback_sig_cap()' in 'env/env.cc'.
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*/
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constexpr static size_t _emergency_ram_size() { return 16*1024; }
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Ram_dataspace_capability _emergency_ram_ds;
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public:
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/**
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* Standard constructor
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*/
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Platform_env()
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:
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_parent_client(Genode::parent_cap(), *this),
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_resources(_parent_client),
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_heap(&_resources.ram, &_resources.rm, Heap::UNLIMITED),
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_emergency_ram_ds(_resources.ram.alloc(_emergency_ram_size()))
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{
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env_stack_area_ram_allocator = &_resources.ram;
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env_stack_area_region_map = &_stack_area;
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}
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/*
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* Support functions for implementing fork on Noux.
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*/
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void reinit(Native_capability::Raw) override;
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void reinit_main_thread(Capability<Region_map> &) override;
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/*************************************
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** Emergency_ram_reserve interface **
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*************************************/
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void release()
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{
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log("used before freeing emergency=", _resources.ram.used_ram());
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_resources.ram.free(_emergency_ram_ds);
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log("used after freeing emergency=", _resources.ram.used_ram());
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}
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/******************************
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** Env_deprecated interface **
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******************************/
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Parent *parent() override { return &_parent_client; }
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Ram_session *ram_session() override { return &_resources.ram; }
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Ram_session_capability ram_session_cap() override { return _resources.ram; }
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Cpu_session *cpu_session() override { return &_resources.cpu; }
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Cpu_session_capability cpu_session_cap() override { return _resources.cpu; }
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Region_map *rm_session() override { return &_resources.rm; }
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Pd_session *pd_session() override { return &_resources.pd; }
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Pd_session_capability pd_session_cap() override { return _resources.pd; }
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Allocator *heap() override { return &_heap; }
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};
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#endif /* _INCLUDE__BASE__INTERNAL__PLATFORM_ENV_H_ */
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