178 lines
3.9 KiB
C++
178 lines
3.9 KiB
C++
/*
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* \brief OKL4-specific implementation of IRQ sessions
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* \author Norman Feske
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* \author Christian Helmuth
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* \date 2009-12-15
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*/
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/*
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* Copyright (C) 2009-2013 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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#include <irq_proxy.h>
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/* core includes */
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#include <irq_root.h>
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/* OKL4 includes */
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namespace Okl4 { extern "C" {
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#include <l4/thread.h>
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#include <l4/schedule.h>
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#include <l4/interrupt.h>
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#include <l4/security.h>
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#include <l4/ipc.h>
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} }
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using namespace Okl4;
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using namespace Genode;
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/**
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* Proxy class with generic thread
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*/
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typedef Irq_proxy<Thread<0x1000> > Proxy;
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/* XXX move this functionality to a central place instead of duplicating it */
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static inline Okl4::L4_ThreadId_t thread_get_my_global_id()
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{
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Okl4::L4_ThreadId_t myself;
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myself.raw = Okl4::__L4_TCR_ThreadWord(UTCB_TCR_THREAD_WORD_MYSELF);
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return myself;
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}
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/**
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* Platform-specific proxy code
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*/
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class Irq_proxy_component : public Proxy
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{
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protected:
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bool _associate()
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{
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/* allow roottask (ourself) to handle the interrupt */
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L4_LoadMR(0, _irq_number);
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int ret = L4_AllowInterruptControl(L4_rootspace);
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if (ret != 1) {
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PERR("L4_AllowInterruptControl returned %d, error code=%ld\n",
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ret, L4_ErrorCode());
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return false;
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}
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/* bit to use for IRQ notifications */
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enum { IRQ_NOTIFY_BIT = 13 };
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/*
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* Note: 'L4_Myself()' does not work for the thread argument of
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* 'L4_RegisterInterrupt'. We have to specify our global ID.
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*/
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L4_LoadMR(0, _irq_number);
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ret = L4_RegisterInterrupt(thread_get_my_global_id(), IRQ_NOTIFY_BIT, 0, 0);
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if (ret != 1) {
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PERR("L4_RegisterInterrupt returned %d, error code=%ld\n",
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ret, L4_ErrorCode());
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return false;
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}
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/* prepare ourself to receive asynchronous IRQ notifications */
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L4_Set_NotifyMask(1 << IRQ_NOTIFY_BIT);
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L4_Accept(L4_NotifyMsgAcceptor);
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return true;
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}
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void _wait_for_irq()
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{
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/* wait for asynchronous interrupt notification */
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L4_ThreadId_t partner = L4_nilthread;
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L4_ReplyWait(partner, &partner);
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}
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void _ack_irq()
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{
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L4_LoadMR(0, _irq_number);
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L4_AcknowledgeInterrupt(0, 0);
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}
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public:
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Irq_proxy_component(long irq_number) : Irq_proxy(irq_number)
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{
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_start();
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}
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};
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/***************************
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** IRQ session component **
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***************************/
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bool Irq_session_component::Irq_control_component::associate_to_irq(unsigned irq)
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{
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return true;
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}
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void Irq_session_component::wait_for_irq()
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{
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/* block at interrupt proxy */
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Proxy *p = Proxy::get_irq_proxy<Irq_proxy_component>(_irq_number);
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if (!p) {
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PERR("Expected to find IRQ proxy for IRQ %02x", _irq_number);
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return;
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}
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p->wait_for_irq();
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/* interrupt ocurred and proxy woke us up */
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}
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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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_irq_alloc(irq_alloc),
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_ep(cap_session, STACK_SIZE, "irqctrl"),
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_irq_attached(false),
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_control_client(Capability<Irq_session_component::Irq_control>())
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{
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/*
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* XXX Removed irq_shared argument as this is the default now. If we need
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* exclusive later on, we should add this as new argument.
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*/
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long irq_number = Arg_string::find_arg(args, "irq_number").long_value(-1);
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if (irq_number == -1) {
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PERR("invalid IRQ number requested");
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throw Root::Unavailable();
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}
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/* check if IRQ thread was started before */
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Proxy *irq_proxy = Proxy::get_irq_proxy<Irq_proxy_component>(irq_number, irq_alloc);
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if (!irq_proxy) {
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PERR("unavailable IRQ %lx requested", irq_number);
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throw Root::Unavailable();
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}
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irq_proxy->add_sharer();
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_irq_number = irq_number;
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/* initialize capability */
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_irq_cap = _ep.manage(this);
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}
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Irq_session_component::~Irq_session_component()
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{
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PERR("not yet implemented");
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/* TODO del_sharer() resp. put_sharer() */
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}
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