178 lines
4.6 KiB
C++
178 lines
4.6 KiB
C++
/*
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* \brief Thread facility
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* \author Martin Stein
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* \date 2012-02-12
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*/
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/*
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* Copyright (C) 2012 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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/* core includes */
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#include <platform_thread.h>
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#include <core_env.h>
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#include <rm_session_component.h>
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using namespace Genode;
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namespace Kernel { unsigned core_id(); }
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bool Platform_thread::_attaches_utcb_by_itself()
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{
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/*
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* If this is a main thread outside of core it'll not manage its
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* virtual context area by itself, as it is done for other threads
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* through a sub RM-session.
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*/
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return _pd_id == Kernel::core_id() || !_main_thread;
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}
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Platform_thread::~Platform_thread()
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{
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/* detach UTCB if main thread outside core */
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if (!_attaches_utcb_by_itself()) {
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assert(_rm_client);
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Rm_session_component * const rm = _rm_client->member_rm_session();
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rm->detach(_virt_utcb);
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}
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/* free UTCB */
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if (_pd_id == Kernel::core_id()) {
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Range_allocator * const ram = platform()->ram_alloc();
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ram->free((void *)_phys_utcb, sizeof(Native_utcb));
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} else {
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Ram_session_component * const ram =
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dynamic_cast<Ram_session_component *>(core_env()->ram_session());
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assert(ram);
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ram->free(_utcb);
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}
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/* destroy object at the kernel */
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Kernel::delete_thread(_id);
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/* free kernel object space */
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Range_allocator * ram = platform()->ram_alloc();
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ram->free(&_kernel_thread, Kernel::thread_size());
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}
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Platform_thread::Platform_thread(const char * name,
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Thread_base * const thread_base,
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unsigned long const stack_size,
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unsigned long const pd_id)
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:
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_thread_base(thread_base), _stack_size(stack_size),
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_pd_id(pd_id), _rm_client(0), _virt_utcb(0)
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{
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strncpy(_name, name, NAME_MAX_LEN);
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/* create UTCB for a core thread */
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Range_allocator * const ram = platform()->ram_alloc();
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assert(ram->alloc_aligned(sizeof(Native_utcb), (void **)&_phys_utcb,
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MIN_MAPPING_SIZE_LOG2));
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_virt_utcb = _phys_utcb;
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/* common constructor parts */
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_init();
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}
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Platform_thread::Platform_thread(const char * name, unsigned int priority,
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addr_t utcb)
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:
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_thread_base(0), _stack_size(0), _pd_id(0), _rm_client(0),
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_virt_utcb((Native_utcb *)utcb)
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{
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strncpy(_name, name, NAME_MAX_LEN);
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/*
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* Allocate UTCB backing store for a thread outside of core. Page alignment
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* is done by RAM session by default. It's save to use core env because
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* this cannot be its server activation thread.
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*/
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try {
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Ram_session_component * const ram =
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dynamic_cast<Ram_session_component *>(core_env()->ram_session());
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assert(ram);
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_utcb = ram->alloc(sizeof(Native_utcb), 1);
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_phys_utcb = (Native_utcb *)ram->phys_addr(_utcb);
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}
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catch (...) { assert(0); }
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/* common constructor parts */
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_init();
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}
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int Platform_thread::join_pd(unsigned long const pd_id,
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bool const main_thread)
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{
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/* check if we're already in another PD */
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if (_pd_id && _pd_id != pd_id) return -1;
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/* denote configuration for start method */
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_pd_id = pd_id;
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_main_thread = main_thread;
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return 0;
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}
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void Platform_thread::_init()
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{
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/* create kernel object */
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Range_allocator * ram = platform()->ram_alloc();
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assert(ram->alloc(Kernel::thread_size(), &_kernel_thread));
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_id = Kernel::new_thread(_kernel_thread, this);
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assert(_id);
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}
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int Platform_thread::start(void * ip, void * sp, unsigned int cpu_no)
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{
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/* check thread attributes */
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assert(_pd_id);
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/* attach UTCB if the thread can't do this by itself */
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if (!_attaches_utcb_by_itself())
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{
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/*
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* Declare page aligned virtual UTCB outside the context area.
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* Kernel afterwards offers this as bootstrap argument to the thread.
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*/
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_virt_utcb = (Native_utcb *)((platform()->vm_start()
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+ platform()->vm_size() - sizeof(Native_utcb))
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& ~((1<<MIN_MAPPING_SIZE_LOG2)-1));
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/* attach UTCB */
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assert(_rm_client);
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Rm_session_component * const rm = _rm_client->member_rm_session();
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try { rm->attach(_utcb, 0, 0, true, _virt_utcb, 0); }
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catch (...) { assert(0); }
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}
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/* let thread participate in CPU scheduling */
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_tlb = Kernel::start_thread(this, ip, sp, cpu_no);
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return _tlb ? 0 : -1;
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}
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void Platform_thread::pager(Pager_object * const pager)
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{
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/* announce pager thread to kernel */
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Kernel::set_pager(pager->cap().dst(), _id);
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/* get RM client from pager pointer */
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_rm_client = dynamic_cast<Rm_client *>(pager);
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assert(_rm_client);
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}
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Genode::Pager_object * Platform_thread::pager() const
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{
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assert(_rm_client)
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return static_cast<Pager_object *>(_rm_client);
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}
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