141 lines
3.2 KiB
C++
141 lines
3.2 KiB
C++
/*
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* \brief Signal context for IRQ's
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* \author Sebastian Sumpf <sebastian.sumpf@genode-labs.com>
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* \date 2012-05-23
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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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#include <signal.h>
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#include <lx_emul.h>
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extern "C" {
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#include <dde_kit/interrupt.h>
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}
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/* our local incarnation of sender and receiver */
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static Signal_helper *_signal = 0;
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/**
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* This contains the Linux-driver handlers
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*/
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struct Irq_handler : Genode::List<Irq_handler>::Element
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{
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void *dev; /* Linux device */
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irq_handler_t handler; /* Linux handler */
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Irq_handler(void *dev, irq_handler_t handler)
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: dev(dev), handler(handler) { }
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};
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/**
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* Signal context for IRQs
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*/
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class Irq_context : public Driver_context,
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public Genode::List<Irq_context>::Element
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{
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private:
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unsigned int _irq; /* IRQ number */
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Genode::List<Irq_handler> _handler_list; /* List of registered handlers */
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Genode::Signal_context_capability _ctx_cap; /* capability for this context */
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static Genode::List<Irq_context> *_list()
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{
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static Genode::List<Irq_context> _l;
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return &_l;
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}
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/**
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* Find context for given IRQ number
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*/
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static Irq_context *_find_ctx(unsigned int irq)
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{
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for (Irq_context *i = _list()->first(); i; i = i->next())
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if (i->_irq == irq)
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return i;
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return 0;
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}
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/* called by the DDE kit upon IRQ */
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static void _dde_handler(void *irq)
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{
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Irq_context *ctx = static_cast<Irq_context *>(irq);
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/* set context & submit signal */
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_signal->sender()->context(ctx->_ctx_cap);
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_signal->sender()->submit();
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}
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public:
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Irq_context(unsigned int irq)
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: _irq(irq),
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_ctx_cap(_signal->receiver()->manage(this))
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{
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/* register at DDE (shared) */
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dde_kit_interrupt_attach(_irq, 1, 0, _dde_handler, this);
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dde_kit_interrupt_enable(_irq);
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_list()->insert(this);
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}
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void handle()
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{
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/* report IRQ to all clients */
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for (Irq_handler *h = _handler_list.first(); h; h = h->next()) {
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irqreturn_t rc;
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do {
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rc = h->handler(_irq, h->dev);
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}
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while (rc == IRQ_HANDLED);
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dde_kit_log(DEBUG_IRQ, "IRQ: %u ret: %u", _irq, rc);
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if (rc == IRQ_HANDLED) {
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Routine::schedule_all();
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return;
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}
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}
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}
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/**
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* Request an IRQ
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*/
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static void request_irq(unsigned int irq, irq_handler_t handler, void *dev)
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{
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Irq_handler *h = new(Genode::env()->heap()) Irq_handler(dev, handler);
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Irq_context *ctx = _find_ctx(irq);
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/* if this IRQ is not registered */
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if (!ctx)
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ctx = new (Genode::env()->heap()) Irq_context(irq);
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/* register Linux handler */
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ctx->_handler_list.insert(h);
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}
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};
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void Irq::init(Genode::Signal_receiver *recv) {
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_signal = new (Genode::env()->heap()) Signal_helper(recv); }
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/***********************
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** linux/interrupt.h **
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***********************/
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int request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
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const char *name, void *dev)
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{
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dde_kit_log(DEBUG_IRQ, "Request irq %u", irq);
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Irq_context::request_irq(irq, handler, dev);
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return 0;
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}
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