214 lines
4.5 KiB
C++
214 lines
4.5 KiB
C++
/*
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* \brief Signal context for IRQ's
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* \author Josef Soentgen
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* \author Christian Helmuth
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* \author Stefan Kalkowski
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* \date 2014-10-14
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*/
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/*
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* Copyright (C) 2014-2015 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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#ifndef _LX_EMUL__IMPL__INTERNAL__IRQ_H_
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#define _LX_EMUL__IMPL__INTERNAL__IRQ_H_
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/* Genode includes */
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#include <base/tslab.h>
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#include <irq_session/client.h>
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#include <platform_device/client.h>
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/* Linux emulation environment includes */
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#include <lx_emul/impl/internal/task.h>
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namespace Lx { class Irq; }
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class Lx::Irq
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{
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private:
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/**
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* Helper utilty for composing IRQ related names
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*/
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struct Name_composer
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{
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char name[16];
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Name_composer(Platform::Device &device)
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{
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Genode::snprintf(name, sizeof(name),
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"irq_%02x:%02x",
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device.vendor_id(),
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device.device_id());
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}
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};
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/**
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* This contains the Linux-driver handlers
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*/
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class Handler : public Lx::List<Handler>::Element
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{
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private:
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void *_dev; /* Linux device */
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irq_handler_t _handler; /* Linux handler */
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irq_handler_t _thread_fn; /* Linux thread function */
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public:
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Handler(void *dev, irq_handler_t handler,
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irq_handler_t thread_fn)
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: _dev(dev), _handler(handler), _thread_fn(thread_fn) { }
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bool handle()
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{
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switch (_handler(0, _dev)) {
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case IRQ_WAKE_THREAD:
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_thread_fn(0, _dev);
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case IRQ_HANDLED:
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return true;
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case IRQ_NONE:
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break;
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}
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return false;
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}
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};
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public:
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/**
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* Context encapsulates the handling of an IRQ
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*/
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class Context : public Lx::List<Context>::Element
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{
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private:
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Name_composer _name;
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Platform::Device &_dev;
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Genode::Irq_session_client _irq_sess;
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Lx::List<Handler> _handler; /* List of registered handlers */
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Lx::Task _task;
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Genode::Signal_rpc_member<Context> _dispatcher;
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/**
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* Signal handler
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*/
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void _handle(unsigned)
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{
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_task.unblock();
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/* kick off scheduling */
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Lx::scheduler().schedule();
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}
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static void _run_irq(void *args)
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{
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Context *ctx = static_cast<Context*>(args);
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while (1) {
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Lx::scheduler().current()->block_and_schedule();
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ctx->handle_irq();
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}
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}
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public:
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/**
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* Constructor
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*/
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Context(Server::Entrypoint &ep,
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Platform::Device &dev)
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:
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_name(dev),
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_dev(dev),
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_irq_sess(dev.irq(0)),
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_task(_run_irq, this, _name.name, Lx::Task::PRIORITY_3, Lx::scheduler()),
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_dispatcher(ep, *this, &Context::_handle)
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{
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_irq_sess.sigh(_dispatcher);
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/* initial ack to receive further IRQ signals */
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_irq_sess.ack_irq();
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}
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/**
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* Handle IRQ
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*/
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void handle_irq()
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{
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bool handled = false;
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/* report IRQ to all clients */
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for (Handler *h = _handler.first(); h; h = h->next()) {
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if ((handled = h->handle())) break;
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}
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_irq_sess.ack_irq();
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}
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/**
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* Add linux handler to context
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*/
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void add_handler(Handler *h) { _handler.append(h); }
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bool device(Platform::Device &dev) {
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return (&dev == &_dev); }
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};
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private:
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using Context_slab = Genode::Tslab<Context, 3 * sizeof(Context)>;
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using Handler_slab = Genode::Tslab<Handler, 3 * sizeof(Handler)>;
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Server::Entrypoint &_ep;
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Lx::List<Context> _list;
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Context_slab _context_alloc;
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Handler_slab _handler_alloc;
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/**
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* Find context for given device
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*/
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Context *_find_context(Platform::Device &dev)
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{
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for (Context *i = _list.first(); i; i = i->next())
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if (i->device(dev)) return i;
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return nullptr;
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}
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Irq(Server::Entrypoint &ep)
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: _ep(ep),
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_context_alloc(Genode::env()->heap()),
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_handler_alloc(Genode::env()->heap()) { }
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public:
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static Irq &irq(Server::Entrypoint *ep = nullptr);
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/**
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* Request an IRQ
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*/
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void request_irq(Platform::Device &dev, irq_handler_t handler,
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void *dev_id, irq_handler_t thread_fn = 0)
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{
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Context *ctx = _find_context(dev);
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/* if this IRQ is not registered */
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if (!ctx) {
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ctx = new (&_context_alloc) Context(_ep, dev);
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_list.insert(ctx);
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}
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/* register Linux handler */
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Handler *h = new (&_handler_alloc)
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Handler(dev_id, handler, thread_fn);
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ctx->add_handler(h);
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}
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};
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#endif /* _LX_EMUL__IMPL__INTERNAL__IRQ_H_ */
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