irq: more emancipation from proc/preempt

[bertos.git] / bertos / kern / irq.c

diff --git a/bertos/kern/irq.c b/bertos/kern/irq.c
new file mode 100644 (file)
index 0000000..23d19af
--- /dev/null
+++ b/bertos/kern/irq.c
@@ -0,0 +1,105 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2008 Bernie Innocenti <bernie@codewiz.org>
+ * -->
+ *
+ * \brief Process scheduler (public interface).
+ *
+ * \version $Id: proc.h 1646 2008-08-17 13:49:48Z bernie $
+ * \author Bernie Innocenti <bernie@codewiz.org>
+ */
+#include "irq.h"
+
+#include <cfg/module.h>
+#include <kern/proc_p.h>
+
+#include <cfg/cfg_kern.h>
+
+#include <unistd.h> // FIXME: move POSIX stuff to irq_posix.h
+
+
+MOD_DEFINE(irq)
+
+// FIXME
+static void (*irq_handlers[100])(void);
+
+/* signal handler */
+void irq_entry(int signum)
+{
+       Process * const old_process = CurrentProcess;
+
+       irq_handlers[signum]();
+
+#if CONFIG_KERN_PREEMPT
+       if (!CurrentProcess)
+       {
+               TRACEMSG("no runnable processes!");
+               IRQ_ENABLE;
+               pause();
+       }
+       else
+       {
+               if (old_process != CurrentProcess)
+               {
+                       TRACEMSG("switching from %p:%s to %p:%s",
+                               old_process, old_process ? old_process->monitor.name : "-",
+                               CurrentProcess, CurrentProcess->monitor.name);
+
+                       if (old_process)
+                               swapcontext(&old_process->context, &CurrentProcess->context);
+                       else
+                               setcontext(&CurrentProcess->context);
+
+                       // not reached
+               }
+               TRACEMSG("keeping %p:%s", CurrentProcess, CurrentProcess->monitor.name);
+       }
+#endif // CONFIG_KERN_PREEMPT
+}
+
+void irq_register(int irq, void (*callback)(void))
+{
+       irq_handlers[irq] = callback;
+}
+
+void irq_init(void)
+{
+       struct sigaction act;
+       act.sa_handler = irq_entry;
+       sigemptyset(&act.sa_mask);
+       //sigaddset(&act.sa_mask, irq);
+       act.sa_flags = SA_RESTART; // | SA_SIGINFO;
+
+       sigaction(SIGUSR1, &act, NULL);
+       #if !(ARCH & ARCH_QT)
+               sigaction(SIGALRM, &act, NULL);
+       #endif
+
+       MOD_INIT(irq);
+}