f7bdd383e2
Issue #1993
195 lines
5.0 KiB
C++
195 lines
5.0 KiB
C++
/*
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* \brief Support for the Linux-specific environment
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* \author Norman Feske
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* \date 2008-12-12
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*/
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/*
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* Copyright (C) 2008-2013 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 General Public License version 2.
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*/
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/* Genode includes */
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#include <util/arg_string.h>
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#include <base/thread.h>
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#include <linux_dataspace/client.h>
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#include <linux_syscalls.h>
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/* base-internal includes */
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#include <base/internal/platform_env.h>
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#include <base/internal/native_thread.h>
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#include <base/internal/globals.h>
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#include <base/internal/parent_socket_handle.h>
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using namespace Genode;
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/****************************************************
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** Support for Platform_env_base::Rm_session_mmap **
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****************************************************/
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size_t Region_map_mmap::_dataspace_size(Dataspace_capability ds)
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{
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if (ds.valid())
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return Dataspace_client(ds).size();
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return Local_capability<Dataspace>::deref(ds)->size();
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}
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int Region_map_mmap::_dataspace_fd(Dataspace_capability ds)
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{
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return Linux_dataspace_client(ds).fd().dst().socket;
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}
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bool Region_map_mmap::_dataspace_writable(Dataspace_capability ds)
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{
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return Dataspace_client(ds).writable();
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}
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/******************
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** Local_parent **
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******************/
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Session_capability Local_parent::session(Service_name const &service_name,
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Session_args const &args,
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Affinity const &affinity)
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{
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if (strcmp(service_name.string(), Rm_session::service_name()) == 0)
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{
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Local_rm_session *session = new (_alloc) Local_rm_session(_alloc);
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return Local_capability<Session>::local_cap(session);
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}
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return Expanding_parent_client::session(service_name, args, affinity);
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}
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void Local_parent::close(Session_capability session)
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{
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/*
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* Handle non-local capabilities
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*/
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if (session.valid()) {
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Parent_client::close(session);
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return;
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}
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/*
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* Detect capability to local RM session
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*/
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Capability<Rm_session> rm = static_cap_cast<Rm_session>(session);
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destroy(_alloc, Local_capability<Rm_session>::deref(rm));
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}
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Local_parent::Local_parent(Parent_capability parent_cap,
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Emergency_ram_reserve &reserve,
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Allocator &alloc)
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:
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Expanding_parent_client(parent_cap, reserve), _alloc(alloc)
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{ }
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/******************
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** Platform_env **
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******************/
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/**
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* List of Unix environment variables, initialized by the startup code
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*/
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extern char **lx_environ;
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/**
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* Read environment variable as long value
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*/
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static unsigned long get_env_ulong(const char *key)
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{
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for (char **curr = lx_environ; curr && *curr; curr++) {
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Arg arg = Arg_string::find_arg(*curr, key);
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if (arg.valid())
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return arg.ulong_value(0);
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}
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return 0;
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}
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static Parent_capability obtain_parent_cap()
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{
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long local_name = get_env_ulong("parent_local_name");
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/* produce typed capability manually */
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typedef Native_capability::Dst Dst;
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Dst const dst(PARENT_SOCKET_HANDLE);
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return reinterpret_cap_cast<Parent>(Native_capability(dst, local_name));
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}
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Local_parent &Platform_env::_parent()
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{
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static Local_parent local_parent(obtain_parent_cap(), *this, _heap);
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return local_parent;
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}
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Platform_env::Platform_env()
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:
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Platform_env_base(static_cap_cast<Ram_session>(_parent().session("Env::ram_session", "")),
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static_cap_cast<Cpu_session>(_parent().session("Env::cpu_session", "")),
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static_cap_cast<Pd_session> (_parent().session("Env::pd_session", ""))),
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_heap(Platform_env_base::ram_session(), Platform_env_base::rm_session()),
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_emergency_ram_ds(ram_session()->alloc(_emergency_ram_size()))
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{
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/* attach stack area to local address space */
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_local_pd_session._address_space.attach_at(_local_pd_session._stack_area.dataspace(),
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stack_area_virtual_base(),
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stack_area_virtual_size());
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env_stack_area_region_map = &_local_pd_session._stack_area;
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env_stack_area_ram_session = ram_session();
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/* register TID and PID of the main thread at core */
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Linux_native_cpu_client native_cpu(cpu_session()->native_cpu());
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native_cpu.thread_id(parent()->main_thread_cap(), lx_getpid(), lx_gettid());
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}
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/*****************************
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** Support for IPC library **
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*****************************/
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namespace Genode {
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Socket_pair server_socket_pair()
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{
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Linux_native_cpu_client native_cpu(env()->cpu_session()->native_cpu());
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Socket_pair socket_pair;
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Thread *thread = Thread::myself();
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if (thread) {
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socket_pair.server_sd = native_cpu.server_sd(thread->cap()).dst().socket;
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socket_pair.client_sd = native_cpu.client_sd(thread->cap()).dst().socket;
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thread->native_thread().socket_pair = socket_pair;
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}
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return socket_pair;
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}
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void destroy_server_socket_pair(Socket_pair socket_pair)
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{
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/* close local file descriptor if it is valid */
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if (socket_pair.server_sd != -1) lx_close(socket_pair.server_sd);
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if (socket_pair.client_sd != -1) lx_close(socket_pair.client_sd);
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}
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}
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