Add hardware interrupt notification mechanism

This allows privileged userland drivers to get notifications of hardware
interrupts.

Initial work by Zheng Da, reworked by Damien Zammit and myself.

* Makefrag.am (libkernel_a_SOURCES): Add device/intr.c and
device/intr.h.
(include_device_HEADERS): Add include/device/notify.defs and
include/device/notify.h.
* device/dev_hdr.h (name_equal): Add declaration.
* device/ds_routines.c: Include <device/intr.h>
(ds_device_intr_register, ds_device_intr_ack): New functions.
* device/intr.c, device/intr.h: New files.
* doc/mach.texi (Device Interrupt): New section.
* i386/Makefrag.am (libkernel_a_SOURCES): Add i386/i386/irq.c and
i386/i386/irq.h.
* i386/i386/irq.c, i386/i386/irq.h: New files.
* i386/i386at/conf.c: Include <device/intr.h>.
(irqname): New macro.
(dev_name_list): Add irq device.
* include/device/device.defs (device_intr_register, device_intr_ack):
New RPCs.
* include/device/notify.defs, include/device/notify.h: New files.
* kern/startup.c: Include <device/intr.h>
(start_kernel_threads): Start intr_thread thread.
* linux/dev/arch/i386/kernel/irq.c: Include <device/intr.h>
(linux_action): Add user_intr field.
(linux_intr): Call user_intr action if any.
(mask_irq, unmask_irq): Move functions to i386/i386/pic.c
(__disable_irq, __enable_irq): Move functions to i386/i386/irq.c.
(install_user_intr_handler): New function.
(request_irq): Initialize user_intr field.
* linux/src/include/asm-i386/irq.h (__disable_irq, __enable_irq): Remove
prototypes.
* i386/i386/pic.c (mask_irq, unmask_irq): New functions.
* i386/i386/pic.h (mask_irq, unmask_irq): New prototypes.

3 files changed, 88 insertions, 0 deletions

diff --git a/include/device/device.defs b/include/device/device.defs
index 409146f5..ec4b5bf8 100644
--- a/include/device/device.defs
+++ b/include/device/device.defs
@@ -142,3 +142,21 @@ routine device_set_filter(
 	in	filter		: filter_array_t
 	);
 
+routine device_intr_register(
+		device		: device_t;
+	in	id		: int;
+	in	flags		: int;
+	in	receive_port	: mach_port_send_t
+	);
+
+/*
+ *	Acknowledge the specified interrupt notification.
+ */
+/*
+ * When an IRQ happens and an intr notification is thus sent, the IRQ line
+ * is kept disabled until the notification is acknowledged with this RPC
+ */
+routine device_intr_ack(
+		device		: device_t;
+	in	receive_port	: mach_port_send_t);
+
diff --git a/include/device/notify.defs b/include/device/notify.defs
new file mode 100644
index 00000000..7919b339
--- /dev/null
+++ b/include/device/notify.defs
@@ -0,0 +1,36 @@
+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+subsystem notify 100;
+
+#include <mach/std_types.defs>
+
+serverprefix do_;
+serverdemux device_intr_notify_server;
+
+simpleroutine device_intr_notify(
+		notify	: notify_port_t;
+		id	: int);
diff --git a/include/device/notify.h b/include/device/notify.h
new file mode 100644
index 00000000..addf9114
--- /dev/null
+++ b/include/device/notify.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2010 Free Software Foundation, Inc.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * THE FREE SOFTWARE FOUNDATIONALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  THE FREE SOFTWARE FOUNDATION DISCLAIMS ANY LIABILITY OF ANY KIND
+ * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ */
+
+/*
+ * Device notification definitions.
+ */
+
+#ifndef	_MACH_DEVICE_NOTIFY_H_
+#define _MACH_DEVICE_NOTIFY_H_
+
+#include <mach/port.h>
+#include <mach/message.h>
+
+typedef struct
+{
+  mach_msg_header_t intr_header;
+  mach_msg_type_t   intr_type;
+  int		    id;
+} device_intr_notification_t;
+
+#define DEVICE_INTR_NOTIFY 100
+
+#endif	/* _MACH_DEVICE_NOTIFY_H_ */