Index: uspace/drv/intctl/obio/Makefile
===================================================================
--- uspace/drv/intctl/obio/Makefile	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
+++ uspace/drv/intctl/obio/Makefile	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
@@ -0,0 +1,39 @@
+#
+# Copyright (c) 2005 Martin Decky
+# Copyright (c) 2007 Jakub Jermar
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# - Redistributions of source code must retain the above copyright
+#   notice, this list of conditions and the following disclaimer.
+# - Redistributions in binary form must reproduce the above copyright
+#   notice, this list of conditions and the following disclaimer in the
+#   documentation and/or other materials provided with the distribution.
+# - The name of the author may not be used to endorse or promote products
+#   derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+USPACE_PREFIX = ../../..
+LIBS = $(LIBDRV_PREFIX)/libdrv.a
+EXTRA_CFLAGS += -I$(LIBDRV_PREFIX)/include
+BINARY = obio
+
+SOURCES = \
+	main.c \
+	obio.c
+
+include $(USPACE_PREFIX)/Makefile.common
Index: uspace/drv/intctl/obio/main.c
===================================================================
--- uspace/drv/intctl/obio/main.c	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
+++ uspace/drv/intctl/obio/main.c	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2017 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup genarch
+ * @{
+ */
+/** @file OBIO driver
+ */
+
+#include <ddf/driver.h>
+#include <ddf/log.h>
+#include <device/hw_res_parsed.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include "obio.h"
+
+#define NAME  "obio"
+
+static int obio_dev_add(ddf_dev_t *dev);
+static int obio_dev_remove(ddf_dev_t *dev);
+static int obio_dev_gone(ddf_dev_t *dev);
+static int obio_fun_online(ddf_fun_t *fun);
+static int obio_fun_offline(ddf_fun_t *fun);
+
+static driver_ops_t driver_ops = {
+	.dev_add = obio_dev_add,
+	.dev_remove = obio_dev_remove,
+	.dev_gone = obio_dev_gone,
+	.fun_online = obio_fun_online,
+	.fun_offline = obio_fun_offline
+};
+
+static driver_t obio_driver = {
+	.name = NAME,
+	.driver_ops = &driver_ops
+};
+
+static int obio_get_res(ddf_dev_t *dev, obio_res_t *res)
+{
+	async_sess_t *parent_sess;
+	hw_res_list_parsed_t hw_res;
+	int rc;
+
+	parent_sess = ddf_dev_parent_sess_get(dev);
+	if (parent_sess == NULL)
+		return ENOMEM;
+
+	hw_res_list_parsed_init(&hw_res);
+	rc = hw_res_get_list_parsed(parent_sess, &hw_res, 0);
+	if (rc != EOK)
+		return rc;
+
+	if (hw_res.mem_ranges.count != 1) {
+		rc = EINVAL;
+		goto error;
+	}
+
+	res->base = RNGABS(hw_res.mem_ranges.ranges[0]);
+
+	return EOK;
+error:
+	hw_res_list_parsed_clean(&hw_res);
+	return rc;
+}
+
+static int obio_dev_add(ddf_dev_t *dev)
+{
+	obio_t *obio;
+	obio_res_t obio_res;
+	int rc;
+
+	ddf_msg(LVL_DEBUG, "obio_dev_add(%p)", dev);
+	obio = ddf_dev_data_alloc(dev, sizeof(obio_t));
+	if (obio == NULL) {
+		ddf_msg(LVL_ERROR, "Failed allocating soft state.");
+		return ENOMEM;
+	}
+
+	obio->dev = dev;
+
+	rc = obio_get_res(dev, &obio_res);
+	if (rc != EOK) {
+		ddf_msg(LVL_ERROR, "Failed getting hardware resource list.\n");
+		return EIO;
+	}
+
+	return obio_add(obio, &obio_res);
+}
+
+static int obio_dev_remove(ddf_dev_t *dev)
+{
+        obio_t *obio = (obio_t *)ddf_dev_data_get(dev);
+
+        ddf_msg(LVL_DEBUG, "obio_dev_remove(%p)", dev);
+
+        return obio_remove(obio);
+}
+
+static int obio_dev_gone(ddf_dev_t *dev)
+{
+        obio_t *obio = (obio_t *)ddf_dev_data_get(dev);
+
+        ddf_msg(LVL_DEBUG, "obio_dev_gone(%p)", dev);
+
+        return obio_gone(obio);
+}
+
+static int obio_fun_online(ddf_fun_t *fun)
+{
+        ddf_msg(LVL_DEBUG, "obio_fun_online()");
+        return ddf_fun_online(fun);
+}
+
+static int obio_fun_offline(ddf_fun_t *fun)
+{
+        ddf_msg(LVL_DEBUG, "obio_fun_offline()");
+        return ddf_fun_offline(fun);
+}
+
+int main(int argc, char *argv[])
+{
+	printf(NAME ": OBIO driver\n");
+	ddf_log_init(NAME);
+	return ddf_driver_main(&obio_driver);
+}
+
+/** @}
+ */
Index: uspace/drv/intctl/obio/obio.c
===================================================================
--- uspace/drv/intctl/obio/obio.c	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
+++ uspace/drv/intctl/obio/obio.c	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
@@ -0,0 +1,177 @@
+/*
+ * Copyright (c) 2009 Jakub Jermar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup obio
+ * @{
+ */
+
+/**
+ * @file obio.c
+ * @brief OBIO driver.
+ *
+ * OBIO is a short for on-board I/O. On UltraSPARC IIi and systems with U2P,
+ * there is a piece of the root PCI bus controller address space, which
+ * contains interrupt mapping and clear registers for all on-board devices.
+ * Although UltraSPARC IIi and U2P are different in general, these registers can
+ * be found at the same addresses.
+ */
+
+#include <align.h>
+#include <as.h>
+#include <async.h>
+#include <ddf/driver.h>
+#include <ddf/log.h>
+#include <ddi.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <ipc/irc.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+#include "obio.h"
+
+#define NAME "obio"
+
+#define OBIO_SIZE	0x1898
+
+#define OBIO_IMR_BASE	0x200
+#define OBIO_IMR(ino)	(OBIO_IMR_BASE + ((ino) & INO_MASK))
+
+#define OBIO_CIR_BASE	0x300
+#define OBIO_CIR(ino)	(OBIO_CIR_BASE + ((ino) & INO_MASK))
+
+#define INO_MASK	0x1f
+
+static uintptr_t base_phys;
+static volatile uint64_t *base_virt = (volatile uint64_t *) AS_AREA_ANY;
+
+/** Handle one connection to obio.
+ *
+ * @param iid		Hash of the request that opened the connection.
+ * @param icall		Call data of the request that opened the connection.
+ * @param arg		Local argument.
+ */
+static void obio_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
+{
+	ipc_callid_t callid;
+	ipc_call_t call;
+
+	/*
+	 * Answer the first IPC_M_CONNECT_ME_TO call.
+	 */
+	async_answer_0(iid, EOK);
+
+	while (1) {
+		int inr;
+
+		callid = async_get_call(&call);
+		switch (IPC_GET_IMETHOD(call)) {
+		case IRC_ENABLE_INTERRUPT:
+			inr = IPC_GET_ARG1(call);
+			base_virt[OBIO_IMR(inr & INO_MASK)] |= (1UL << 31);
+			async_answer_0(callid, EOK);
+			break;
+		case IRC_DISABLE_INTERRUPT:
+			/* XXX TODO */
+			async_answer_0(callid, EOK);
+			break;
+		case IRC_CLEAR_INTERRUPT:
+			inr = IPC_GET_ARG1(call);
+			base_virt[OBIO_CIR(inr & INO_MASK)] = 0;
+			async_answer_0(callid, EOK);
+			break;
+		default:
+			async_answer_0(callid, EINVAL);
+			break;
+		}
+	}
+}
+
+/** Add OBIO device. */
+int obio_add(obio_t *obio, obio_res_t *res)
+{
+	ddf_fun_t *fun_a = NULL;
+	int rc;
+
+	base_phys = (uintptr_t) 0x1fe00000000ULL;
+
+	int flags = AS_AREA_READ | AS_AREA_WRITE;
+	int retval = physmem_map(base_phys,
+	    ALIGN_UP(OBIO_SIZE, PAGE_SIZE) >> PAGE_WIDTH, flags,
+	    (void *) &base_virt);
+
+	if (retval < 0) {
+		ddf_msg(LVL_ERROR, "Error mapping OBIO registers");
+		rc = EIO;
+		goto error;
+	}
+
+	ddf_msg(LVL_NOTE, "OBIO registers with base at 0x%" PRIun, base_phys);
+
+	fun_a = ddf_fun_create(obio->dev, fun_exposed, "a");
+	if (fun_a == NULL) {
+		ddf_msg(LVL_ERROR, "Failed creating function 'a'.");
+		rc = ENOMEM;
+		goto error;
+	}
+
+	ddf_fun_set_conn_handler(fun_a, obio_connection);
+
+	rc = ddf_fun_bind(fun_a);
+	if (rc != EOK) {
+		ddf_msg(LVL_ERROR, "Failed binding function 'a'. (%d)", rc);
+		goto error;
+	}
+
+	rc = ddf_fun_add_to_category(fun_a, "irc");
+	if (rc != EOK)
+		goto error;
+
+	return EOK;
+error:
+	if (fun_a != NULL)
+		ddf_fun_destroy(fun_a);
+	return rc;
+}
+
+/** Remove OBIO device */
+int obio_remove(obio_t *obio)
+{
+	return ENOTSUP;
+}
+
+/** OBIO device gone */
+int obio_gone(obio_t *obio)
+{
+	return ENOTSUP;
+}
+
+
+/**
+ * @}
+ */
Index: uspace/drv/intctl/obio/obio.h
===================================================================
--- uspace/drv/intctl/obio/obio.h	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
+++ uspace/drv/intctl/obio/obio.h	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2017 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup genarch
+ * @{
+ */
+/** @file
+ */
+
+#ifndef OBIO_H_
+#define OBIO_H_
+
+#include <ddf/driver.h>
+#include <ddi.h>
+#include <loc.h>
+#include <stdint.h>
+
+typedef struct {
+	uintptr_t base;
+} obio_res_t;
+
+/** OBIO */
+typedef struct {
+	ioport32_t *regs;
+	uintptr_t phys_base;
+	ddf_dev_t *dev;
+} obio_t;
+
+extern int obio_add(obio_t *, obio_res_t *);
+extern int obio_remove(obio_t *);
+extern int obio_gone(obio_t *);
+
+#endif
+
+/** @}
+ */
Index: uspace/drv/intctl/obio/obio.ma
===================================================================
--- uspace/drv/intctl/obio/obio.ma	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
+++ uspace/drv/intctl/obio/obio.ma	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
@@ -0,0 +1,1 @@
+10 ebus/obio
Index: uspace/drv/platform/sun4u/sun4u.c
===================================================================
--- uspace/drv/platform/sun4u/sun4u.c	(revision 04649677bb4fbe5c0b699c27add4f8664d9a15fc)
+++ uspace/drv/platform/sun4u/sun4u.c	(revision be1b1e6839cb14854c85b8177b374d75b272007e)
@@ -85,4 +85,29 @@
 	.name = NAME,
 	.driver_ops = &sun4u_ops
+};
+
+static hw_resource_t obio_res[] = {
+	{
+		.type = MEM_RANGE,
+		.res.mem_range = {
+			.address = PBM_BASE + PBM_PCI_CONFIG_BASE,
+			.size = PBM_PCI_CONFIG_SIZE,
+			.relative = false,
+			.endianness = LITTLE_ENDIAN
+		}
+	}
+};
+
+static sun4u_fun_t obio_data = {
+	.hw_resources = {
+		.count = sizeof(obio_res) / sizeof(obio_res[0]),
+		.resources = obio_res
+	},
+	.pio_window = {
+		.mem = {
+			.base = PBM_BASE + PBM_PCI_MEM_BASE,
+			.size = PBM_PCI_MEM_SIZE
+		}
+	}
 };
 
@@ -201,4 +226,7 @@
 static bool sun4u_add_functions(ddf_dev_t *dev)
 {
+	if (!sun4u_add_fun(dev, "obio", "ebus/obio", &obio_data))
+		return false;
+
 	return sun4u_add_fun(dev, "pci0", "intel_pci", &pci_data);
 }
