Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2567 insertions, 0 deletions

diff --git a/drivers/s390/net/iucv.c b/drivers/s390/net/iucv.c
new file mode 100644
index 0000000..1ac6563
--- /dev/null
+++ b/drivers/s390/net/iucv.c
@@ -0,0 +1,2567 @@
+/* 
+ * $Id: iucv.c,v 1.43 2005/02/09 14:47:43 braunu Exp $
+ *
+ * IUCV network driver
+ *
+ * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s):
+ *    Original source:
+ *      Alan Altmark (Alan_Altmark@us.ibm.com)  Sept. 2000
+ *      Xenia Tkatschow (xenia@us.ibm.com)
+ *    2Gb awareness and general cleanup:
+ *      Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
+ *
+ * Documentation used:
+ *    The original source
+ *    CP Programming Service, IBM document # SC24-5760
+ *
+ * This program 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * RELEASE-TAG: IUCV lowlevel driver $Revision: 1.43 $
+ *
+ */
+
+/* #define DEBUG */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/config.h>
+
+#include <linux/spinlock.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <asm/atomic.h>
+#include "iucv.h"
+#include <asm/io.h>
+#include <asm/s390_ext.h>
+#include <asm/ebcdic.h>
+#include <asm/smp.h>
+#include <asm/ccwdev.h> //for root device stuff
+
+/* FLAGS:
+ * All flags are defined in the field IPFLAGS1 of each function
+ * and can be found in CP Programming Services.
+ * IPSRCCLS - Indicates you have specified a source class
+ * IPFGMCL  - Indicates you have specified a target class
+ * IPFGPID  - Indicates you have specified a pathid
+ * IPFGMID  - Indicates you have specified a message ID
+ * IPANSLST - Indicates that you are using an address list for
+ *            reply data
+ * IPBUFLST - Indicates that you are using an address list for
+ *            message data
+ */
+
+#define IPSRCCLS 	0x01
+#define IPFGMCL         0x01
+#define IPFGPID         0x02
+#define IPFGMID         0x04
+#define IPANSLST        0x08
+#define IPBUFLST        0x40
+
+static int
+iucv_bus_match (struct device *dev, struct device_driver *drv)
+{
+	return 0;
+}
+
+struct bus_type iucv_bus = {
+	.name = "iucv",
+	.match = iucv_bus_match,
+};	
+
+struct device *iucv_root;
+
+/* General IUCV interrupt structure */
+typedef struct {
+	__u16 ippathid;
+	__u8  res1;
+	__u8  iptype;
+	__u32 res2;
+	__u8  ipvmid[8];
+	__u8  res3[24];
+} iucv_GeneralInterrupt;
+
+static iucv_GeneralInterrupt *iucv_external_int_buffer = NULL;
+
+/* Spin Lock declaration */
+
+static DEFINE_SPINLOCK(iucv_lock);
+
+static int messagesDisabled = 0;
+
+/***************INTERRUPT HANDLING ***************/
+
+typedef struct {
+	struct list_head queue;
+	iucv_GeneralInterrupt data;
+} iucv_irqdata;
+
+static struct list_head  iucv_irq_queue;
+static DEFINE_SPINLOCK(iucv_irq_queue_lock);
+
+/*
+ *Internal function prototypes
+ */
+static void iucv_tasklet_handler(unsigned long);
+static void iucv_irq_handler(struct pt_regs *, __u16);
+
+static DECLARE_TASKLET(iucv_tasklet,iucv_tasklet_handler,0);
+
+/************ FUNCTION ID'S ****************************/
+
+#define ACCEPT          10
+#define CONNECT         11
+#define DECLARE_BUFFER  12
+#define PURGE           9
+#define QUERY           0
+#define QUIESCE         13
+#define RECEIVE         5
+#define REJECT          8
+#define REPLY           6
+#define RESUME          14
+#define RETRIEVE_BUFFER 2
+#define SEND            4
+#define SETMASK         16
+#define SEVER           15
+
+/**
+ * Structure: handler
+ * members: list - list management.
+ *          structure: id
+ *             userid - 8 char array of machine identification
+ *             user_data - 16 char array for user identification
+ *             mask - 24 char array used to compare the 2 previous
+ *          interrupt_table - vector of interrupt functions.
+ *          pgm_data -  ulong, application data that is passed
+ *                      to the interrupt handlers
+*/
+typedef struct handler_t {
+	struct list_head list;
+	struct {
+		__u8 userid[8];
+		__u8 user_data[16];
+		__u8 mask[24];
+	}                    id;
+	iucv_interrupt_ops_t *interrupt_table;
+	void                 *pgm_data;
+} handler;
+
+/**
+ * iucv_handler_table: List of registered handlers.
+ */
+static struct list_head iucv_handler_table;
+
+/**
+ * iucv_pathid_table: an array of *handler pointing into
+ *                    iucv_handler_table for fast indexing by pathid;
+ */
+static handler **iucv_pathid_table;
+
+static unsigned long max_connections;
+
+/**
+ * iucv_cpuid: contains the logical cpu number of the cpu which
+ * has declared the iucv buffer by issuing DECLARE_BUFFER.
+ * If no cpu has done the initialization iucv_cpuid contains -1.
+ */
+static int iucv_cpuid = -1;
+/**
+ * register_flag: is 0 when external interrupt has not been registered
+ */
+static int register_flag;
+
+/****************FIVE 40-BYTE PARAMETER STRUCTURES******************/
+/* Data struct 1: iparml_control
+ * Used for iucv_accept
+ *          iucv_connect
+ *          iucv_quiesce
+ *          iucv_resume
+ *          iucv_sever
+ *          iucv_retrieve_buffer
+ * Data struct 2: iparml_dpl     (data in parameter list)
+ * Used for iucv_send_prmmsg
+ *          iucv_send2way_prmmsg
+ *          iucv_send2way_prmmsg_array
+ *          iucv_reply_prmmsg
+ * Data struct 3: iparml_db       (data in a buffer)
+ * Used for iucv_receive
+ *          iucv_receive_array
+ *          iucv_reject
+ *          iucv_reply
+ *          iucv_reply_array
+ *          iucv_send
+ *          iucv_send_array
+ *          iucv_send2way
+ *          iucv_send2way_array
+ *          iucv_declare_buffer
+ * Data struct 4: iparml_purge
+ * Used for iucv_purge
+ *          iucv_query
+ * Data struct 5: iparml_set_mask
+ * Used for iucv_set_mask
+ */
+
+typedef struct {
+	__u16 ippathid;
+	__u8  ipflags1;
+	__u8  iprcode;
+	__u16 ipmsglim;
+	__u16 res1;
+	__u8  ipvmid[8];
+	__u8  ipuser[16];
+	__u8  iptarget[8];
+} iparml_control;
+
+typedef struct {
+	__u16 ippathid;
+	__u8  ipflags1;
+	__u8  iprcode;
+	__u32 ipmsgid;
+	__u32 iptrgcls;
+	__u8  iprmmsg[8];
+	__u32 ipsrccls;
+	__u32 ipmsgtag;
+	__u32 ipbfadr2;
+	__u32 ipbfln2f;
+	__u32 res;
+} iparml_dpl;
+
+typedef struct {
+	__u16 ippathid;
+	__u8  ipflags1;
+	__u8  iprcode;
+	__u32 ipmsgid;
+	__u32 iptrgcls;
+	__u32 ipbfadr1;
+	__u32 ipbfln1f;
+	__u32 ipsrccls;
+	__u32 ipmsgtag;
+	__u32 ipbfadr2;
+	__u32 ipbfln2f;
+	__u32 res;
+} iparml_db;
+
+typedef struct {
+	__u16 ippathid;
+	__u8  ipflags1;
+	__u8  iprcode;
+	__u32 ipmsgid;
+	__u8  ipaudit[3];
+	__u8  res1[5];
+	__u32 res2;
+	__u32 ipsrccls;
+	__u32 ipmsgtag;
+	__u32 res3[3];
+} iparml_purge;
+
+typedef struct {
+	__u8  ipmask;
+	__u8  res1[2];
+	__u8  iprcode;
+	__u32 res2[9];
+} iparml_set_mask;
+
+typedef struct {
+	union {
+		iparml_control  p_ctrl;
+		iparml_dpl      p_dpl;
+		iparml_db       p_db;
+		iparml_purge    p_purge;
+		iparml_set_mask p_set_mask;
+	} param;
+	atomic_t in_use;
+	__u32    res;
+}  __attribute__ ((aligned(8))) iucv_param;
+#define PARAM_POOL_SIZE (PAGE_SIZE / sizeof(iucv_param))
+
+static iucv_param * iucv_param_pool;
+
+MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
+MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
+MODULE_LICENSE("GPL");
+
+/*
+ * Debugging stuff
+ *******************************************************************************/
+
+
+#ifdef DEBUG
+static int debuglevel = 0;
+
+module_param(debuglevel, int, 0);
+MODULE_PARM_DESC(debuglevel,
+ "Specifies the debug level (0=off ... 3=all)");
+
+static void
+iucv_dumpit(char *title, void *buf, int len)
+{
+	int i;
+	__u8 *p = (__u8 *)buf;
+
+	if (debuglevel < 3)
+		return;
+
+	printk(KERN_DEBUG "%s\n", title);
+	printk("  ");
+	for (i = 0; i < len; i++) {
+		if (!(i % 16) && i != 0)
+			printk ("\n  ");
+		else if (!(i % 4) && i != 0)
+			printk(" ");
+		printk("%02X", *p++);
+	}
+	if (len % 16)
+		printk ("\n");
+	return;
+}
+#define iucv_debug(lvl, fmt, args...) \
+do { \
+	if (debuglevel >= lvl) \
+		printk(KERN_DEBUG "%s: " fmt "\n", __FUNCTION__ , ## args); \
+} while (0)
+
+#else
+
+#define iucv_debug(lvl, fmt, args...)
+#define iucv_dumpit(title, buf, len)
+
+#endif
+
+/*
+ * Internal functions
+ *******************************************************************************/
+
+/**
+ * print start banner
+ */
+static void
+iucv_banner(void)
+{
+	char vbuf[] = "$Revision: 1.43 $";
+	char *version = vbuf;
+
+	if ((version = strchr(version, ':'))) {
+		char *p = strchr(version + 1, '$');
+		if (p)
+			*p = '\0';
+	} else
+		version = " ??? ";
+	printk(KERN_INFO
+	       "IUCV lowlevel driver Version%s initialized\n", version);
+}
+
+/**
+ * iucv_init - Initialization
+ *
+ * Allocates and initializes various data structures.
+ */
+static int
+iucv_init(void)
+{
+	int ret;
+
+	if (iucv_external_int_buffer)
+		return 0;
+
+	if (!MACHINE_IS_VM) {
+		printk(KERN_ERR "IUCV: IUCV connection needs VM as base\n");
+		return -EPROTONOSUPPORT;
+	}
+
+	ret = bus_register(&iucv_bus);
+	if (ret) {
+		printk(KERN_ERR "IUCV: failed to register bus.\n");
+		return ret;
+	}
+
+	iucv_root = s390_root_dev_register("iucv");
+	if (IS_ERR(iucv_root)) {
+		printk(KERN_ERR "IUCV: failed to register iucv root.\n");
+		bus_unregister(&iucv_bus);
+		return PTR_ERR(iucv_root);
+	}
+
+	/* Note: GFP_DMA used used to get memory below 2G */
+	iucv_external_int_buffer = kmalloc(sizeof(iucv_GeneralInterrupt),
+					   GFP_KERNEL|GFP_DMA);
+	if (!iucv_external_int_buffer) {
+		printk(KERN_WARNING
+		       "%s: Could not allocate external interrupt buffer\n",
+		       __FUNCTION__);
+		s390_root_dev_unregister(iucv_root);
+		bus_unregister(&iucv_bus);
+		return -ENOMEM;
+	}
+	memset(iucv_external_int_buffer, 0, sizeof(iucv_GeneralInterrupt));
+
+	/* Initialize parameter pool */
+	iucv_param_pool = kmalloc(sizeof(iucv_param) * PARAM_POOL_SIZE,
+				  GFP_KERNEL|GFP_DMA);
+	if (!iucv_param_pool) {
+		printk(KERN_WARNING "%s: Could not allocate param pool\n",
+		       __FUNCTION__);
+		kfree(iucv_external_int_buffer);
+		iucv_external_int_buffer = NULL;
+		s390_root_dev_unregister(iucv_root);
+		bus_unregister(&iucv_bus);
+		return -ENOMEM;
+	}
+	memset(iucv_param_pool, 0, sizeof(iucv_param) * PARAM_POOL_SIZE);
+
+	/* Initialize irq queue */
+	INIT_LIST_HEAD(&iucv_irq_queue);
+
+	/* Initialize handler table */
+	INIT_LIST_HEAD(&iucv_handler_table);
+
+	iucv_banner();
+	return 0;
+}
+
+/**
+ * iucv_exit - De-Initialization
+ *
+ * Frees everything allocated from iucv_init.
+ */
+static int iucv_retrieve_buffer (void);
+
+static void
+iucv_exit(void)
+{
+	iucv_retrieve_buffer();
+      	if (iucv_external_int_buffer) {
+		kfree(iucv_external_int_buffer);
+		iucv_external_int_buffer = NULL;
+	}
+	if (iucv_param_pool) {
+		kfree(iucv_param_pool);
+		iucv_param_pool = NULL;
+	}
+	s390_root_dev_unregister(iucv_root);
+	bus_unregister(&iucv_bus);
+	printk(KERN_INFO "IUCV lowlevel driver unloaded\n");
+}
+
+/**
+ * grab_param: - Get a parameter buffer from the pre-allocated pool.
+ *
+ * This function searches for an unused element in the pre-allocated pool
+ * of parameter buffers. If one is found, it marks it "in use" and returns
+ * a pointer to it. The calling function is responsible for releasing it
+ * when it has finished its usage.
+ *
+ * Returns: A pointer to iucv_param.
+ */
+static __inline__ iucv_param *
+grab_param(void)
+{
+	iucv_param *ptr;
+        static int hint = 0;
+
+	ptr = iucv_param_pool + hint;
+	do {
+		ptr++;
+		if (ptr >= iucv_param_pool + PARAM_POOL_SIZE)
+			ptr = iucv_param_pool;
+	} while (atomic_compare_and_swap(0, 1, &ptr->in_use));
+	hint = ptr - iucv_param_pool;
+
+	memset(&ptr->param, 0, sizeof(ptr->param));
+	return ptr;
+}
+
+/**
+ * release_param - Release a parameter buffer.
+ * @p: A pointer to a struct iucv_param, previously obtained by calling
+ *     grab_param().
+ *
+ * This function marks the specified parameter buffer "unused".
+ */
+static __inline__ void
+release_param(void *p)
+{
+	atomic_set(&((iucv_param *)p)->in_use, 0);
+}
+
+/**
+ * iucv_add_handler: - Add a new handler
+ * @new_handler: handle that is being entered into chain.
+ *
+ * Places new handle on iucv_handler_table, if identical handler is not
+ * found.
+ *
+ * Returns: 0 on success, !0 on failure (handler already in chain).
+ */
+static int
+iucv_add_handler (handler *new)
+{
+	ulong flags;
+
+	iucv_debug(1, "entering");
+	iucv_dumpit("handler:", new, sizeof(handler));
+
+	spin_lock_irqsave (&iucv_lock, flags);
+	if (!list_empty(&iucv_handler_table)) {
+		struct list_head *lh;
+
+		/**
+		 * Search list for handler with identical id. If one
+		 * is found, the new handler is _not_ added.
+		 */
+		list_for_each(lh, &iucv_handler_table) {
+			handler *h = list_entry(lh, handler, list);
+			if (!memcmp(&new->id, &h->id, sizeof(h->id))) {
+				iucv_debug(1, "ret 1");
+				spin_unlock_irqrestore (&iucv_lock, flags);
+				return 1;
+			}
+		}
+	}
+	/**
+	 * If we get here, no handler was found.
+	 */
+	INIT_LIST_HEAD(&new->list);
+	list_add(&new->list, &iucv_handler_table);
+	spin_unlock_irqrestore (&iucv_lock, flags);
+
+	iucv_debug(1, "exiting");
+	return 0;
+}
+
+/**
+ * b2f0:
+ * @code: identifier of IUCV call to CP.
+ * @parm: pointer to 40 byte iparml area passed to CP
+ *
+ * Calls CP to execute IUCV commands.
+ *
+ * Returns: return code from CP's IUCV call
+ */
+static __inline__ ulong
+b2f0(__u32 code, void *parm)
+{
+	iucv_dumpit("iparml before b2f0 call:", parm, sizeof(iucv_param));
+
+	asm volatile (
+		"LRA   1,0(%1)\n\t"
+		"LR    0,%0\n\t"
+		".long 0xb2f01000"
+		:
+		: "d" (code), "a" (parm)
+		: "0", "1"
+		);
+
+	iucv_dumpit("iparml after b2f0 call:", parm, sizeof(iucv_param));
+
+	return (unsigned long)*((__u8 *)(parm + 3));
+}
+
+/*
+ * Name: iucv_add_pathid
+ * Purpose: Adds a path id to the system.
+ * Input: pathid -  pathid that is going to be entered into system
+ *        handle -  address of handler that the pathid will be associated
+ *		   with.
+ *        pgm_data - token passed in by application.
+ * Output: 0: successful addition of pathid
+ *	   - EINVAL - pathid entry is being used by another application
+ *	   - ENOMEM - storage allocation for a new pathid table failed
+*/
+static int
+__iucv_add_pathid(__u16 pathid, handler *handler)
+{
+
+	iucv_debug(1, "entering");
+
+	iucv_debug(1, "handler is pointing to %p", handler);
+
+	if (pathid > (max_connections - 1))
+		return -EINVAL;
+
+	if (iucv_pathid_table[pathid]) {
+		iucv_debug(1, "pathid entry is %p", iucv_pathid_table[pathid]);
+		printk(KERN_WARNING
+		       "%s: Pathid being used, error.\n", __FUNCTION__);
+		return -EINVAL;
+	}
+	iucv_pathid_table[pathid] = handler;
+
+	iucv_debug(1, "exiting");
+	return 0;
+}				/* end of add_pathid function */
+
+static int
+iucv_add_pathid(__u16 pathid, handler *handler)
+{
+	ulong flags;
+	int rc;
+
+	spin_lock_irqsave (&iucv_lock, flags);
+	rc = __iucv_add_pathid(pathid, handler);
+	spin_unlock_irqrestore (&iucv_lock, flags);
+	return rc;
+}
+
+static void
+iucv_remove_pathid(__u16 pathid)
+{
+	ulong flags;
+
+	if (pathid > (max_connections - 1))
+		return;
+
+	spin_lock_irqsave (&iucv_lock, flags);
+	iucv_pathid_table[pathid] = NULL;
+	spin_unlock_irqrestore (&iucv_lock, flags);
+}
+
+/**
+ * iucv_declare_buffer_cpuid
+ * Register at VM for subsequent IUCV operations. This is executed
+ * on the reserved CPU iucv_cpuid. Called from iucv_declare_buffer().
+ */
+static void
+iucv_declare_buffer_cpuid (void *result)
+{
+	iparml_db *parm;
+
+	parm = (iparml_db *)grab_param();
+	parm->ipbfadr1 = virt_to_phys(iucv_external_int_buffer);
+	if ((*((ulong *)result) = b2f0(DECLARE_BUFFER, parm)) == 1)
+		*((ulong *)result) = parm->iprcode;
+	release_param(parm);
+}
+
+/**
+ * iucv_retrieve_buffer_cpuid:
+ * Unregister IUCV usage at VM. This is always executed on the same
+ * cpu that registered the buffer to VM.
+ * Called from iucv_retrieve_buffer().
+ */
+static void
+iucv_retrieve_buffer_cpuid (void *cpu)
+{
+	iparml_control *parm;
+
+	parm = (iparml_control *)grab_param();
+	b2f0(RETRIEVE_BUFFER, parm);
+	release_param(parm);
+}
+
+/**
+ * Name: iucv_declare_buffer
+ * Purpose: Specifies the guests real address of an external
+ *          interrupt.
+ * Input: void
+ * Output: iprcode - return code from b2f0 call
+ */
+static int
+iucv_declare_buffer (void)
+{
+	unsigned long flags;
+	ulong b2f0_result;
+
+	iucv_debug(1, "entering");
+	b2f0_result = -ENODEV;
+	spin_lock_irqsave (&iucv_lock, flags);
+	if (iucv_cpuid == -1) {
+		/* Reserve any cpu for use by iucv. */
+		iucv_cpuid = smp_get_cpu(CPU_MASK_ALL);
+		spin_unlock_irqrestore (&iucv_lock, flags);
+		smp_call_function_on(iucv_declare_buffer_cpuid,
+			&b2f0_result, 0, 1, iucv_cpuid);
+		if (b2f0_result) {
+			smp_put_cpu(iucv_cpuid);
+			iucv_cpuid = -1;
+		}
+		iucv_debug(1, "Address of EIB = %p", iucv_external_int_buffer);
+	} else {
+		spin_unlock_irqrestore (&iucv_lock, flags);
+		b2f0_result = 0;
+	}
+	iucv_debug(1, "exiting");
+	return b2f0_result;
+}
+
+/**
+ * iucv_retrieve_buffer:
+ *
+ * Terminates all use of IUCV.
+ * Returns: return code from CP
+ */
+static int
+iucv_retrieve_buffer (void)
+{
+	iucv_debug(1, "entering");
+	if (iucv_cpuid != -1) {
+		smp_call_function_on(iucv_retrieve_buffer_cpuid,
+				     0, 0, 1, iucv_cpuid);
+		/* Release the cpu reserved by iucv_declare_buffer. */
+		smp_put_cpu(iucv_cpuid);
+		iucv_cpuid = -1;
+	}
+	iucv_debug(1, "exiting");
+	return 0;
+}
+
+/**
+ * iucv_remove_handler:
+ * @users_handler: handler to be removed
+ *
+ * Remove handler when application unregisters.
+ */
+static void
+iucv_remove_handler(handler *handler)
+{
+	unsigned long flags;
+
+	if ((!iucv_pathid_table) || (!handler))
+		return;
+
+	iucv_debug(1, "entering");
+
+	spin_lock_irqsave (&iucv_lock, flags);
+	list_del(&handler->list);
+	if (list_empty(&iucv_handler_table)) {
+		if (register_flag) {
+			unregister_external_interrupt(0x4000, iucv_irq_handler);
+			register_flag = 0;
+		}
+	}
+	spin_unlock_irqrestore (&iucv_lock, flags);
+
+	iucv_debug(1, "exiting");
+	return;
+}
+
+/**
+ * iucv_register_program:
+ * @pgmname:  user identification
+ * @userid:   machine identification
+ * @pgmmask:  Indicates which bits in the pgmname and userid combined will be
+ *            used to determine who is given control.
+ * @ops:      Address of interrupt handler table.
+ * @pgm_data: Application data to be passed to interrupt handlers.
+ *
+ * Registers an application with IUCV.
+ * Returns:
+ *           The address of handler, or NULL on failure.
+ * NOTE on pgmmask:
+ *   If pgmname, userid and pgmmask are provided, pgmmask is entered into the
+ *   handler as is.
+ *   If pgmmask is NULL, the internal mask is set to all 0xff's
+ *   When userid is NULL, the first 8 bytes of the internal mask are forced
+ *   to 0x00.
+ *   If pgmmask and userid are NULL, the first 8 bytes of the internal mask
+ *   are forced to 0x00 and the last 16 bytes to 0xff.
+ */
+
+iucv_handle_t
+iucv_register_program (__u8 pgmname[16],
+		       __u8 userid[8],
+		       __u8 pgmmask[24],
+		       iucv_interrupt_ops_t * ops, void *pgm_data)
+{
+	ulong rc = 0;		/* return code from function calls */
+	handler *new_handler;
+
+	iucv_debug(1, "entering");
+
+	if (ops == NULL) {
+		/* interrupt table is not defined */
+		printk(KERN_WARNING "%s: Interrupt table is not defined, "
+		       "exiting\n", __FUNCTION__);
+		return NULL;
+	}
+	if (!pgmname) {
+		printk(KERN_WARNING "%s: pgmname not provided\n", __FUNCTION__);
+		return NULL;
+	}
+
+	/* Allocate handler entry */
+	new_handler = (handler *)kmalloc(sizeof(handler), GFP_ATOMIC);
+	if (new_handler == NULL) {
+		printk(KERN_WARNING "%s: storage allocation for new handler "
+		       "failed.\n", __FUNCTION__);
+		return NULL;
+	}
+
+	if (!iucv_pathid_table) {
+		if (iucv_init()) {
+			kfree(new_handler);
+			return NULL;
+		}
+
+		max_connections = iucv_query_maxconn();
+		iucv_pathid_table = kmalloc(max_connections * sizeof(handler *),
+				       GFP_ATOMIC);
+		if (iucv_pathid_table == NULL) {
+			printk(KERN_WARNING "%s: iucv_pathid_table storage "
+			       "allocation failed\n", __FUNCTION__);
+			kfree(new_handler);
+			return NULL;
+		}
+		memset (iucv_pathid_table, 0, max_connections * sizeof(handler *));
+	}
+	memset(new_handler, 0, sizeof (handler));
+	memcpy(new_handler->id.user_data, pgmname,
+		sizeof (new_handler->id.user_data));
+	if (userid) {
+		memcpy (new_handler->id.userid, userid,
+			sizeof (new_handler->id.userid));
+		ASCEBC (new_handler->id.userid,
+			sizeof (new_handler->id.userid));
+		EBC_TOUPPER (new_handler->id.userid,
+			     sizeof (new_handler->id.userid));
+		
+		if (pgmmask) {
+			memcpy (new_handler->id.mask, pgmmask,
+				sizeof (new_handler->id.mask));
+		} else {
+			memset (new_handler->id.mask, 0xFF,
+				sizeof (new_handler->id.mask));
+		}
+	} else {
+		if (pgmmask) {
+			memcpy (new_handler->id.mask, pgmmask,
+				sizeof (new_handler->id.mask));
+		} else {
+			memset (new_handler->id.mask, 0xFF,
+				sizeof (new_handler->id.mask));
+		}
+		memset (new_handler->id.userid, 0x00,
+			sizeof (new_handler->id.userid));
+	}
+	/* fill in the rest of handler */
+	new_handler->pgm_data = pgm_data;
+	new_handler->interrupt_table = ops;
+
+	/*
+	 * Check if someone else is registered with same pgmname, userid
+	 * and mask. If someone is already registered with same pgmname,
+	 * userid and mask, registration will fail and NULL will be returned
+	 * to the application.
+	 * If identical handler not found, then handler is added to list.
+	 */
+	rc = iucv_add_handler(new_handler);
+	if (rc) {
+		printk(KERN_WARNING "%s: Someone already registered with same "
+		       "pgmname, userid, pgmmask\n", __FUNCTION__);
+		kfree (new_handler);
+		return NULL;
+	}
+
+	rc = iucv_declare_buffer();
+	if (rc) {
+		char *err = "Unknown";
+		iucv_remove_handler(new_handler);
+		kfree(new_handler);
+		switch(rc) {
+		case 0x03:
+			err = "Directory error";
+			break;
+		case 0x0a:
+			err = "Invalid length";
+			break;
+		case 0x13:
+			err = "Buffer already exists";
+			break;
+		case 0x3e:
+			err = "Buffer overlap";
+			break;
+		case 0x5c:
+			err = "Paging or storage error";
+			break;
+		}
+		printk(KERN_WARNING "%s: iucv_declare_buffer "
+		       "returned error 0x%02lx (%s)\n", __FUNCTION__, rc, err);
+		return NULL;
+	}
+	if (!register_flag) {
+		/* request the 0x4000 external interrupt */
+		rc = register_external_interrupt (0x4000, iucv_irq_handler);
+		if (rc) {
+			iucv_remove_handler(new_handler);
+			kfree (new_handler);
+			printk(KERN_WARNING "%s: "
+			       "register_external_interrupt returned %ld\n",
+			       __FUNCTION__, rc);
+			return NULL;
+
+		}
+		register_flag = 1;
+	}
+	iucv_debug(1, "exiting");
+	return new_handler;
+}				/* end of register function */
+
+/**
+ * iucv_unregister_program:
+ * @handle: address of handler
+ *
+ * Unregister application with IUCV.
+ * Returns:
+ *   0 on success, -EINVAL, if specified handle is invalid.
+ */
+
+int
+iucv_unregister_program (iucv_handle_t handle)
+{
+	handler *h = NULL;
+	struct list_head *lh;
+	int i;
+	ulong flags;
+
+	iucv_debug(1, "entering");
+	iucv_debug(1, "address of handler is %p", h);
+
+	/* Checking if handle is valid  */
+	spin_lock_irqsave (&iucv_lock, flags);
+	list_for_each(lh, &iucv_handler_table) {
+		if ((handler *)handle == list_entry(lh, handler, list)) {
+			h = (handler *)handle;
+			break;
+		}
+	}
+	if (!h) {
+		spin_unlock_irqrestore (&iucv_lock, flags);
+		if (handle)
+			printk(KERN_WARNING
+			       "%s: Handler not found in iucv_handler_table.\n",
+			       __FUNCTION__);
+		else
+			printk(KERN_WARNING
+			       "%s: NULL handle passed by application.\n",
+			       __FUNCTION__);
+		return -EINVAL;
+	}
+
+	/**
+	 * First, walk thru iucv_pathid_table and sever any pathid which is
+	 * still pointing to the handler to be removed.
+	 */
+	for (i = 0; i < max_connections; i++)
+		if (iucv_pathid_table[i] == h) {
+			spin_unlock_irqrestore (&iucv_lock, flags);
+			iucv_sever(i, h->id.user_data);
+			spin_lock_irqsave(&iucv_lock, flags);
+		}
+	spin_unlock_irqrestore (&iucv_lock, flags);
+
+	iucv_remove_handler(h);
+	kfree(h);
+
+	iucv_debug(1, "exiting");
+	return 0;
+}
+
+/**
+ * iucv_accept:
+ * @pathid:             Path identification number
+ * @msglim_reqstd:      The number of outstanding messages requested.
+ * @user_data:          Data specified by the iucv_connect function.
+ * @flags1:             Contains options for this path.
+ *     - IPPRTY (0x20)   Specifies if you want to send priority message.
+ *     - IPRMDATA (0x80) Specifies whether your program can handle a message
+ *                       in the parameter list.
+ *     - IPQUSCE (0x40)  Specifies whether you want to quiesce the path being
+ *		         established.
+ * @handle:             Address of handler.
+ * @pgm_data:           Application data passed to interrupt handlers.
+ * @flags1_out:         Pointer to an int. If not NULL, on return the options for
+ *                      the path are stored at the given location:
+ *     - IPPRTY (0x20)  Indicates you may send a priority message.
+ * @msglim:             Pointer to an __u16. If not NULL, on return the maximum
+ *                      number of outstanding messages is stored at the given
+ *                      location.
+ *
+ * This function is issued after the user receives a Connection Pending external
+ * interrupt and now wishes to complete the IUCV communication path.
+ * Returns:
+ *   return code from CP
+ */
+int
+iucv_accept(__u16 pathid, __u16 msglim_reqstd,
+	     __u8 user_data[16], int flags1,
+	     iucv_handle_t handle, void *pgm_data,
+	     int *flags1_out, __u16 * msglim)
+{
+	ulong b2f0_result = 0;
+	ulong flags;
+	struct list_head *lh;
+	handler *h = NULL;
+	iparml_control *parm;
+
+	iucv_debug(1, "entering");
+	iucv_debug(1, "pathid = %d", pathid);
+
+	/* Checking if handle is valid  */
+	spin_lock_irqsave (&iucv_lock, flags);
+	list_for_each(lh, &iucv_handler_table) {
+		if ((handler *)handle == list_entry(lh, handler, list)) {
+			h = (handler *)handle;
+			break;
+		}
+	}
+	spin_unlock_irqrestore (&iucv_lock, flags);
+
+	if (!h) {
+		if (handle)
+			printk(KERN_WARNING
+			       "%s: Handler not found in iucv_handler_table.\n",
+			       __FUNCTION__);
+		else
+			printk(KERN_WARNING
+			       "%s: NULL handle passed by application.\n",
+			       __FUNCTION__);
+		return -EINVAL;
+	}
+
+	parm = (iparml_control *)grab_param();
+
+	parm->ippathid = pathid;
+	parm->ipmsglim = msglim_reqstd;
+	if (user_data)
+		memcpy(parm->ipuser, user_data, sizeof(parm->ipuser));
+
+	parm->ipflags1 = (__u8)flags1;
+	b2f0_result = b2f0(ACCEPT, parm);
+
+	if (!b2f0_result) {
+		if (msglim)
+			*msglim = parm->ipmsglim;
+		if (pgm_data)
+			h->pgm_data = pgm_data;
+		if (flags1_out)
+			*flags1_out = (parm->ipflags1 & IPPRTY) ? IPPRTY : 0;
+	}
+	release_param(parm);
+
+	iucv_debug(1, "exiting");
+	return b2f0_result;
+}
+
+/**
+ * iucv_connect:
+ * @pathid:        Path identification number
+ * @msglim_reqstd: Number of outstanding messages requested
+ * @user_data:     16-byte user data
+ * @userid:        8-byte of user identification
+ * @system_name:   8-byte identifying the system name
+ * @flags1:        Specifies options for this path:
+ *     - IPPRTY (0x20)   Specifies if you want to send priority message.
+ *     - IPRMDATA (0x80) Specifies whether your program can handle a message
+ *                       in  the parameter list.
+ *     - IPQUSCE (0x40)  Specifies whether you want to quiesce the path being
+ *                       established.
+ *     - IPLOCAL (0x01)  Allows an application to force the partner to be on the
+ *                       local system. If local is specified then target class
+ *                       cannot be specified.
+ * @flags1_out:    Pointer to an int. If not NULL, on return the options for
+ *                 the path are stored at the given location:
+ *     - IPPRTY (0x20)   Indicates you may send a priority message.
+ * @msglim:        Pointer to an __u16. If not NULL, on return the maximum
+ *                 number of outstanding messages is stored at the given
+ *                 location.
+ * @handle:        Address of handler.
+ * @pgm_data:      Application data to be passed to interrupt handlers.
+ *
+ * This function establishes an IUCV path. Although the connect may complete
+ * successfully, you are not able to use the path until you receive an IUCV
+ * Connection Complete external interrupt.
+ * Returns: return code from CP, or one of the following
+ *     - ENOMEM
+ *     - return code from iucv_declare_buffer
+ *     - EINVAL - invalid handle passed by application
+ *     - EINVAL - pathid address is NULL
+ *     - ENOMEM - pathid table storage allocation failed
+ *     - return code from internal function add_pathid
+ */
+int
+iucv_connect (__u16 *pathid, __u16 msglim_reqstd,
+	      __u8 user_data[16], __u8 userid[8],
+	      __u8 system_name[8], int flags1,
+	      int *flags1_out, __u16 * msglim,
+	      iucv_handle_t handle, void *pgm_data)
+{
+	iparml_control *parm;
+	iparml_control local_parm;
+	struct list_head *lh;
+	ulong b2f0_result = 0;
+	ulong flags;
+	int add_pathid_result = 0;
+	handler *h = NULL;
+	__u8 no_memory[16] = "NO MEMORY";
+
+	iucv_debug(1, "entering");
+
+	/* Checking if handle is valid  */
+	spin_lock_irqsave (&iucv_lock, flags);
+	list_for_each(lh, &iucv_handler_table) {
+		if ((handler *)handle == list_entry(lh, handler, list)) {
+			h = (handler *)handle;
+			break;
+		}
+	}
+	spin_unlock_irqrestore (&iucv_lock, flags);
+
+	if (!h) {
+		if (handle)
+			printk(KERN_WARNING
+			       "%s: Handler not found in iucv_handler_table.\n",
+			       __FUNCTION__);
+		else
+			printk(KERN_WARNING
+			       "%s: NULL handle passed by application.\n",
+			       __FUNCTION__);
+		return -EINVAL;
+	}
+
+	if (pathid == NULL) {
+		printk(KERN_WARNING "%s: NULL pathid pointer\n",
+		       __FUNCTION__);
+		return -EINVAL;
+	}
+
+	parm = (iparml_control *)grab_param();
+
+	parm->ipmsglim = msglim_reqstd;
+
+	if (user_data)
+		memcpy(parm->ipuser, user_data, sizeof(parm->ipuser));
+
+	if (userid) {
+		memcpy(parm->ipvmid, userid, sizeof(parm->ipvmid));
+		ASCEBC(parm->ipvmid, sizeof(parm->ipvmid));
+		EBC_TOUPPER(parm->ipvmid, sizeof(parm->ipvmid));
+	}
+
+	if (system_name) {
+		memcpy(parm->iptarget, system_name, sizeof(parm->iptarget));
+		ASCEBC(parm->iptarget, sizeof(parm->iptarget));
+		EBC_TOUPPER(parm->iptarget, sizeof(parm->iptarget));
+	}
+
+	/* In order to establish an IUCV connection, the procedure is:
+         *
+         * b2f0(CONNECT)
+         * take the ippathid from the b2f0 call
+         * register the handler to the ippathid
+         *
+         * Unfortunately, the ConnectionEstablished message gets sent after the
+         * b2f0(CONNECT) call but before the register is handled.
+         *
+         * In order for this race condition to be eliminated, the IUCV Control
+         * Interrupts must be disabled for the above procedure.
+         *
+         * David Kennedy <dkennedy@linuxcare.com>
+         */
+
+	/* Enable everything but IUCV Control messages */
+	iucv_setmask(~(AllInterrupts));
+	messagesDisabled = 1;
+
+	spin_lock_irqsave (&iucv_lock, flags);
+	parm->ipflags1 = (__u8)flags1;
+	b2f0_result = b2f0(CONNECT, parm);
+	memcpy(&local_parm, parm, sizeof(local_parm));
+	release_param(parm);
+	parm = &local_parm;
+	if (!b2f0_result)
+		add_pathid_result = __iucv_add_pathid(parm->ippathid, h);
+	spin_unlock_irqrestore (&iucv_lock, flags);
+
+	if (b2f0_result) {
+		iucv_setmask(~0);
+		messagesDisabled = 0;
+		return b2f0_result;
+	}
+
+	*pathid = parm->ippathid;
+
+	/* Enable everything again */
+	iucv_setmask(IUCVControlInterruptsFlag);
+
+	if (msglim)
+		*msglim = parm->ipmsglim;
+	if (flags1_out)
+		*flags1_out = (parm->ipflags1 & IPPRTY) ? IPPRTY : 0;
+
+	if (add_pathid_result) {
+		iucv_sever(*pathid, no_memory);
+		printk(KERN_WARNING "%s: add_pathid failed with rc ="
+			" %d\n", __FUNCTION__, add_pathid_result);
+		return(add_pathid_result);
+	}
+
+	iucv_debug(1, "exiting");
+	return b2f0_result;
+}
+
+/**
+ * iucv_purge:
+ * @pathid: Path identification number
+ * @msgid:  Message ID of message to purge.
+ * @srccls: Message class of the message to purge.
+ * @audit:  Pointer to an __u32. If not NULL, on return, information about
+ *          asynchronous errors that may have affected the normal completion
+ *          of this message ist stored at the given location.
+ *
+ * Cancels a message you have sent.
+ * Returns: return code from CP
+ */
+int
+iucv_purge (__u16 pathid, __u32 msgid, __u32 srccls, __u32 *audit)
+{
+	iparml_purge *parm;
+	ulong b2f0_result = 0;
+
+	iucv_debug(1, "entering");
+	iucv_debug(1, "pathid = %d", pathid);
+
+	parm = (iparml_purge *)grab_param();
+
+	parm->ipmsgid = msgid;
+	parm->ippathid = pathid;
+	parm->ipsrccls = srccls;
+	parm->ipflags1 |= (IPSRCCLS | IPFGMID | IPFGPID);
+	b2f0_result = b2f0(PURGE, parm);
+
+	if (!b2f0_result && audit) {
+		memcpy(audit, parm->ipaudit, sizeof(parm->ipaudit));
+		/* parm->ipaudit has only 3 bytes */
+		*audit >>= 8;
+	}
+	
+	release_param(parm);
+
+	iucv_debug(1, "b2f0_result = %ld", b2f0_result);
+	iucv_debug(1, "exiting");
+	return b2f0_result;
+}
+
+/**
+ * iucv_query_generic:
+ * @want_maxconn: Flag, describing which value is to be returned.
+ *
+ * Helper function for iucv_query_maxconn() and iucv_query_bufsize().
+ *
+ * Returns: The buffersize, if want_maxconn is 0; the maximum number of
+ *           connections, if want_maxconn is 1 or an error-code < 0 on failure.
+ */
+static int
+iucv_query_generic(int want_maxconn)
+{
+	iparml_purge *parm = (iparml_purge *)grab_param();
+	int bufsize, maxconn;
+	int ccode;
+
+	/**
+	 * Call b2f0 and store R0 (max buffer size),
+	 * R1 (max connections) and CC.
+	 */
+	asm volatile (
+		"LRA   1,0(%4)\n\t"
+		"LR    0,%3\n\t"
+		".long 0xb2f01000\n\t"
+		"IPM   %0\n\t"
+		"SRL   %0,28\n\t"
+		"ST    0,%1\n\t"
+		"ST    1,%2\n\t"
+		: "=d" (ccode), "=m" (bufsize), "=m" (maxconn)
+		: "d" (QUERY), "a" (parm)
+		: "0", "1", "cc"
+		);
+	release_param(parm);
+
+	if (ccode)
+		return -EPERM;
+	if (want_maxconn)
+		return maxconn;
+	return bufsize;
+}
+
+/**
+ * iucv_query_maxconn:
+ *
+ * Determines the maximum number of connections thay may be established.
+ *
+ * Returns: Maximum number of connections that can be.
+ */
+ulong
+iucv_query_maxconn(void)
+{
+	return iucv_query_generic(1);
+}
+
+/**
+ * iucv_query_bufsize:
+ *
+ * Determines the size of the external interrupt buffer.
+ *
+ * Returns: Size of external interrupt buffer.
+ */
+ulong
+iucv_query_bufsize (void)
+{
+	return iucv_query_generic(0);
+}
+
+/**
+ * iucv_quiesce:
+ * @pathid:    Path identification number
+ * @user_data: 16-byte user data
+ *
+ * Temporarily suspends incoming messages on an IUCV path.
+ * You can later reactivate the path by invoking the iucv_resume function.
+ * Returns: return code from CP
+ */
+int
+iucv_quiesce (__u16 pathid, __u8 user_data[16])
+{
+	iparml_control *parm;
+	ulong b2f0_result = 0;
+
+	iucv_debug(1, "entering");
+	iucv_debug(1, "pathid = %d", pathid);
+
+	parm = (iparml_control *)grab_param();
+
+	memcpy(parm->ipuser, user_data, sizeof(parm->ipuser));
+	parm->ippathid = pathid;
+
+	b2f0_result = b2f0(QUIESCE, parm);
+	release_param(parm);
+
+	iucv_debug(1, "b2f0_result = %ld", b2f0_result);
+	iucv_debug(1, "exiting");
+
+	return b2f0_result;
+}
+
+/**
+ * iucv_receive:
+ * @pathid: Path identification number.
+ * @buffer: Address of buffer to receive. Must be below 2G.
+ * @buflen: Length of buffer to receive.
+ * @msgid:  Specifies the message ID.
+ * @trgcls: Specifies target class.
+ * @flags1_out: Receives options for path on return.
+ *    - IPNORPY (0x10)  Specifies whether a reply is required
+ *    - IPPRTY (0x20)   Specifies if you want to send priority message
+ *    - IPRMDATA (0x80) Specifies the data is contained in the parameter list
+ * @residual_buffer: Receives the address of buffer updated by the number
+ *                   of bytes you have received on return.
+ * @residual_length: On return, receives one of the following values:
+ *    - 0                          If the receive buffer is the same length as
+ *                                 the message.
+ *    - Remaining bytes in buffer  If the receive buffer is longer than the
+ *                                 message.
+ *    - Remaining bytes in message If the receive buffer is shorter than the
+ *                                 message.
+ *
+ * This function receives messages that are being sent to you over established
+ * paths.
+ * Returns: return code from CP IUCV call; If the receive buffer is shorter
+ *   than the message, always 5
+ *   -EINVAL - buffer address is pointing to NULL
+ */
+int
+iucv_receive (__u16 pathid, __u32 msgid, __u32 trgcls,
+	      void *buffer, ulong buflen,
+	      int *flags1_out, ulong * residual_buffer, ulong * residual_length)
+{
+	iparml_db *parm;
+	ulong b2f0_result;
+	int moved = 0;	/* number of bytes moved from parmlist to buffer */
+
+	iucv_debug(2, "entering");
+
+	if (!buffer)
+		return -EINVAL;
+
+	parm = (iparml_db *)grab_param();
+
+	parm->ipbfadr1 = (__u32) (addr_t) buffer;
+	parm->ipbfln1f = (__u32) ((ulong) buflen);
+	parm->ipmsgid = msgid;
+	parm->ippathid = pathid;
+	parm->iptrgcls = trgcls;
+	parm->ipflags1 = (IPFGPID | IPFGMID | IPFGMCL);
+
+	b2f0_result = b2f0(RECEIVE, parm);
+
+	if (!b2f0_result || b2f0_result == 5) {
+		if (flags1_out) {
+			iucv_debug(2, "*flags1_out = %d", *flags1_out);
+			*flags1_out = (parm->ipflags1 & (~0x07));
+			iucv_debug(2, "*flags1_out = %d", *flags1_out);
+		}
+
+		if (!(parm->ipflags1 & IPRMDATA)) {	/*msg not in parmlist */
+			if (residual_length)
+				*residual_length = parm->ipbfln1f;
+
+			if (residual_buffer)
+				*residual_buffer = parm->ipbfadr1;
+		} else {
+			moved = min_t (unsigned long, buflen, 8);
+
+			memcpy ((char *) buffer,
+				(char *) &parm->ipbfadr1, moved);
+
+			if (buflen < 8)
+				b2f0_result = 5;
+
+			if (residual_length)
+				*residual_length = abs (buflen - 8);
+
+			if (residual_buffer)
+				*residual_buffer = (ulong) (buffer + moved);
+		}
+	}
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_receive_array
+ * Purpose: This function receives messages that are being sent to you
+ *          over established paths.
+ * Input: pathid - path identification number
+ *        buffer - address of array of buffers
+ *        buflen - total length of buffers
+ *        msgid - specifies the message ID.
+ *        trgcls - specifies target class
+ * Output:
+ *        flags1_out: Options for path.
+ *          IPNORPY - 0x10 specifies whether a reply is required
+ *          IPPRTY - 0x20 specifies if you want to send priority message
+ *         IPRMDATA - 0x80 specifies the data is contained in the parameter list
+ *       residual_buffer - address points to the current list entry IUCV
+ *                         is working on.
+ *       residual_length -
+ *              Contains one of the following values, if the receive buffer is:
+ *               The same length as the message, this field is zero.
+ *               Longer than the message, this field contains the number of
+ *                bytes remaining in the buffer.
+ *               Shorter than the message, this field contains the residual
+ *                count (that is, the number of bytes remaining in the
+ *                message that does not fit into the buffer. In this case
+ *		  b2f0_result = 5.
+ * Return: b2f0_result - return code from CP
+ *         (-EINVAL) - buffer address is NULL
+ */
+int
+iucv_receive_array (__u16 pathid,
+		    __u32 msgid, __u32 trgcls,
+		    iucv_array_t * buffer, ulong buflen,
+		    int *flags1_out,
+		    ulong * residual_buffer, ulong * residual_length)
+{
+	iparml_db *parm;
+	ulong b2f0_result;
+	int i = 0, moved = 0, need_to_move = 8, dyn_len;
+
+	iucv_debug(2, "entering");
+
+	if (!buffer)
+		return -EINVAL;
+
+	parm = (iparml_db *)grab_param();
+
+	parm->ipbfadr1 = (__u32) ((ulong) buffer);
+	parm->ipbfln1f = (__u32) buflen;
+	parm->ipmsgid = msgid;
+	parm->ippathid = pathid;
+	parm->iptrgcls = trgcls;
+	parm->ipflags1 = (IPBUFLST | IPFGPID | IPFGMID | IPFGMCL);
+
+	b2f0_result = b2f0(RECEIVE, parm);
+
+	if (!b2f0_result || b2f0_result == 5) {
+
+		if (flags1_out) {
+			iucv_debug(2, "*flags1_out = %d", *flags1_out);
+			*flags1_out = (parm->ipflags1 & (~0x07));
+			iucv_debug(2, "*flags1_out = %d", *flags1_out);
+		}
+
+		if (!(parm->ipflags1 & IPRMDATA)) {	/*msg not in parmlist */
+
+			if (residual_length)
+				*residual_length = parm->ipbfln1f;
+
+			if (residual_buffer)
+				*residual_buffer = parm->ipbfadr1;
+
+		} else {
+			/* copy msg from parmlist to users array. */
+
+			while ((moved < 8) && (moved < buflen)) {
+				dyn_len =
+				    min_t (unsigned int,
+					 (buffer + i)->length, need_to_move);
+
+				memcpy ((char *)((ulong)((buffer + i)->address)),
+					((char *) &parm->ipbfadr1) + moved,
+					dyn_len);
+
+				moved += dyn_len;
+				need_to_move -= dyn_len;
+
+				(buffer + i)->address =
+				    	(__u32)
+				((ulong)(__u8 *) ((ulong)(buffer + i)->address)
+						+ dyn_len);
+
+				(buffer + i)->length -= dyn_len;
+				i++;
+			}
+
+			if (need_to_move)	/* buflen < 8 bytes */
+				b2f0_result = 5;
+
+			if (residual_length)
+				*residual_length = abs (buflen - 8);
+
+			if (residual_buffer) {
+				if (!moved)
+					*residual_buffer = (ulong) buffer;
+				else
+					*residual_buffer =
+					    (ulong) (buffer + (i - 1));
+			}
+
+		}
+	}
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+	return b2f0_result;
+}
+
+/**
+ * iucv_reject:
+ * @pathid: Path identification number.
+ * @msgid:  Message ID of the message to reject.
+ * @trgcls: Target class of the message to reject.
+ * Returns: return code from CP
+ *
+ * Refuses a specified message. Between the time you are notified of a
+ * message and the time that you complete the message, the message may
+ * be rejected.
+ */
+int
+iucv_reject (__u16 pathid, __u32 msgid, __u32 trgcls)
+{
+	iparml_db *parm;
+	ulong b2f0_result = 0;
+
+	iucv_debug(1, "entering");
+	iucv_debug(1, "pathid = %d", pathid);
+
+	parm = (iparml_db *)grab_param();
+
+	parm->ippathid = pathid;
+	parm->ipmsgid = msgid;
+	parm->iptrgcls = trgcls;
+	parm->ipflags1 = (IPFGMCL | IPFGMID | IPFGPID);
+
+	b2f0_result = b2f0(REJECT, parm);
+	release_param(parm);
+
+	iucv_debug(1, "b2f0_result = %ld", b2f0_result);
+	iucv_debug(1, "exiting");
+
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_reply
+ * Purpose: This function responds to the two-way messages that you
+ *          receive. You must identify completely the message to
+ *          which you wish to reply. ie, pathid, msgid, and trgcls.
+ * Input: pathid - path identification number
+ *        msgid - specifies the message ID.
+ *        trgcls - specifies target class
+ *        flags1 - option for path
+ *                 IPPRTY- 0x20 - specifies if you want to send priority message
+ *        buffer - address of reply buffer
+ *        buflen - length of reply buffer
+ * Output: ipbfadr2 - Address of buffer updated by the number
+ *                    of bytes you have moved.
+ *         ipbfln2f - Contains one of the following values:
+ *              If the answer buffer is the same length as the reply, this field
+ *               contains zero.
+ *              If the answer buffer is longer than the reply, this field contains
+ *               the number of bytes remaining in the buffer.
+ *              If the answer buffer is shorter than the reply, this field contains
+ *               a residual count (that is, the number of bytes remianing in the
+ *               reply that does not fit into the buffer. In this
+ *                case b2f0_result = 5.
+ * Return: b2f0_result - return code from CP
+ *         (-EINVAL) - buffer address is NULL
+ */
+int
+iucv_reply (__u16 pathid,
+	    __u32 msgid, __u32 trgcls,
+	    int flags1,
+	    void *buffer, ulong buflen, ulong * ipbfadr2, ulong * ipbfln2f)
+{
+	iparml_db *parm;
+	ulong b2f0_result;
+
+	iucv_debug(2, "entering");
+
+	if (!buffer)
+		return -EINVAL;
+
+	parm = (iparml_db *)grab_param();
+
+	parm->ipbfadr2 = (__u32) ((ulong) buffer);
+	parm->ipbfln2f = (__u32) buflen;	/* length of message */
+	parm->ippathid = pathid;
+	parm->ipmsgid = msgid;
+	parm->iptrgcls = trgcls;
+	parm->ipflags1 = (__u8) flags1;	/* priority message */
+
+	b2f0_result = b2f0(REPLY, parm);
+
+	if ((!b2f0_result) || (b2f0_result == 5)) {
+		if (ipbfadr2)
+			*ipbfadr2 = parm->ipbfadr2;
+		if (ipbfln2f)
+			*ipbfln2f = parm->ipbfln2f;
+	}
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_reply_array
+ * Purpose: This function responds to the two-way messages that you
+ *          receive. You must identify completely the message to
+ *          which you wish to reply. ie, pathid, msgid, and trgcls.
+ *          The array identifies a list of addresses and lengths of
+ *          discontiguous buffers that contains the reply data.
+ * Input: pathid - path identification number
+ *        msgid - specifies the message ID.
+ *        trgcls - specifies target class
+ *        flags1 - option for path
+ *                 IPPRTY- specifies if you want to send priority message
+ *        buffer - address of array of reply buffers
+ *        buflen - total length of reply buffers
+ * Output: ipbfadr2 - Address of buffer which IUCV is currently working on.
+ *         ipbfln2f - Contains one of the following values:
+ *              If the answer buffer is the same length as the reply, this field
+ *               contains zero.
+ *              If the answer buffer is longer than the reply, this field contains
+ *               the number of bytes remaining in the buffer.
+ *              If the answer buffer is shorter than the reply, this field contains
+ *               a residual count (that is, the number of bytes remianing in the
+ *               reply that does not fit into the buffer. In this
+ *               case b2f0_result = 5.
+ * Return: b2f0_result - return code from CP
+ *             (-EINVAL) - buffer address is NULL
+*/
+int
+iucv_reply_array (__u16 pathid,
+		  __u32 msgid, __u32 trgcls,
+		  int flags1,
+		  iucv_array_t * buffer,
+		  ulong buflen, ulong * ipbfadr2, ulong * ipbfln2f)
+{
+	iparml_db *parm;
+	ulong b2f0_result;
+
+	iucv_debug(2, "entering");
+
+	if (!buffer)
+		return -EINVAL;
+
+	parm = (iparml_db *)grab_param();
+
+	parm->ipbfadr2 = (__u32) ((ulong) buffer);
+	parm->ipbfln2f = buflen;	/* length of message */
+	parm->ippathid = pathid;
+	parm->ipmsgid = msgid;
+	parm->iptrgcls = trgcls;
+	parm->ipflags1 = (IPANSLST | flags1);
+
+	b2f0_result = b2f0(REPLY, parm);
+
+	if ((!b2f0_result) || (b2f0_result == 5)) {
+
+		if (ipbfadr2)
+			*ipbfadr2 = parm->ipbfadr2;
+		if (ipbfln2f)
+			*ipbfln2f = parm->ipbfln2f;
+	}
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_reply_prmmsg
+ * Purpose: This function responds to the two-way messages that you
+ *          receive. You must identify completely the message to
+ *          which you wish to reply. ie, pathid, msgid, and trgcls.
+ *          Prmmsg signifies the data is moved into the
+ *          parameter list.
+ * Input: pathid - path identification number
+ *        msgid - specifies the message ID.
+ *        trgcls - specifies target class
+ *        flags1 - option for path
+ *                 IPPRTY- specifies if you want to send priority message
+ *        prmmsg - 8-bytes of data to be placed into the parameter
+ *                 list.
+ * Output: NA
+ * Return: b2f0_result - return code from CP
+*/
+int
+iucv_reply_prmmsg (__u16 pathid,
+		   __u32 msgid, __u32 trgcls, int flags1, __u8 prmmsg[8])
+{
+	iparml_dpl *parm;
+	ulong b2f0_result;
+
+	iucv_debug(2, "entering");
+
+	parm = (iparml_dpl *)grab_param();
+
+	parm->ippathid = pathid;
+	parm->ipmsgid = msgid;
+	parm->iptrgcls = trgcls;
+	memcpy(parm->iprmmsg, prmmsg, sizeof (parm->iprmmsg));
+	parm->ipflags1 = (IPRMDATA | flags1);
+
+	b2f0_result = b2f0(REPLY, parm);
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+
+	return b2f0_result;
+}
+
+/**
+ * iucv_resume:
+ * @pathid:    Path identification number
+ * @user_data: 16-byte of user data
+ *
+ * This function restores communication over a quiesced path.
+ * Returns: return code from CP
+ */
+int
+iucv_resume (__u16 pathid, __u8 user_data[16])
+{
+	iparml_control *parm;
+	ulong b2f0_result = 0;
+
+	iucv_debug(1, "entering");
+	iucv_debug(1, "pathid = %d", pathid);
+
+	parm = (iparml_control *)grab_param();
+
+	memcpy (parm->ipuser, user_data, sizeof (*user_data));
+	parm->ippathid = pathid;
+
+	b2f0_result = b2f0(RESUME, parm);
+	release_param(parm);
+
+	iucv_debug(1, "exiting");
+
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_send
+ * Purpose: sends messages
+ * Input: pathid - ushort, pathid
+ *        msgid  - ulong *, id of message returned to caller
+ *        trgcls - ulong, target message class
+ *        srccls - ulong, source message class
+ *        msgtag - ulong, message tag
+ *	  flags1  - Contains options for this path.
+ *		IPPRTY - Ox20 - specifies if you want to send a priority message.
+ *        buffer - pointer to buffer
+ *        buflen - ulong, length of buffer
+ * Output: b2f0_result - return code from b2f0 call
+ *         msgid - returns message id
+ */
+int
+iucv_send (__u16 pathid, __u32 * msgid,
+	   __u32 trgcls, __u32 srccls,
+	   __u32 msgtag, int flags1, void *buffer, ulong buflen)
+{
+	iparml_db *parm;
+	ulong b2f0_result;
+
+	iucv_debug(2, "entering");
+
+	if (!buffer)
+		return -EINVAL;
+
+	parm = (iparml_db *)grab_param();
+
+	parm->ipbfadr1 = (__u32) ((ulong) buffer);
+	parm->ippathid = pathid;
+	parm->iptrgcls = trgcls;
+	parm->ipbfln1f = (__u32) buflen;	/* length of message */
+	parm->ipsrccls = srccls;
+	parm->ipmsgtag = msgtag;
+	parm->ipflags1 = (IPNORPY | flags1);	/* one way priority message */
+
+	b2f0_result = b2f0(SEND, parm);
+
+	if ((!b2f0_result) && (msgid))
+		*msgid = parm->ipmsgid;
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_send_array
+ * Purpose: This function transmits data to another application.
+ *          The contents of buffer is the address of the array of
+ *          addresses and lengths of discontiguous buffers that hold
+ *          the message text. This is a one-way message and the
+ *          receiver will not reply to the message.
+ * Input: pathid - path identification number
+ *        trgcls - specifies target class
+ *        srccls - specifies the source message class
+ *        msgtag - specifies a tag to be associated witht the message
+ *        flags1 - option for path
+ *                 IPPRTY- specifies if you want to send priority message
+ *        buffer - address of array of send buffers
+ *        buflen - total length of send buffers
+ * Output: msgid - specifies the message ID.
+ * Return: b2f0_result - return code from CP
+ *         (-EINVAL) - buffer address is NULL
+ */
+int
+iucv_send_array (__u16 pathid,
+		 __u32 * msgid,
+		 __u32 trgcls,
+		 __u32 srccls,
+		 __u32 msgtag, int flags1, iucv_array_t * buffer, ulong buflen)
+{
+	iparml_db *parm;
+	ulong b2f0_result;
+
+	iucv_debug(2, "entering");
+
+	if (!buffer)
+		return -EINVAL;
+
+	parm = (iparml_db *)grab_param();
+
+	parm->ippathid = pathid;
+	parm->iptrgcls = trgcls;
+	parm->ipbfadr1 = (__u32) ((ulong) buffer);
+	parm->ipbfln1f = (__u32) buflen;	/* length of message */
+	parm->ipsrccls = srccls;
+	parm->ipmsgtag = msgtag;
+	parm->ipflags1 = (IPNORPY | IPBUFLST | flags1);
+	b2f0_result = b2f0(SEND, parm);
+
+	if ((!b2f0_result) && (msgid))
+		*msgid = parm->ipmsgid;
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_send_prmmsg
+ * Purpose: This function transmits data to another application.
+ *          Prmmsg specifies that the 8-bytes of data are to be moved
+ *          into the parameter list. This is a one-way message and the
+ *          receiver will not reply to the message.
+ * Input: pathid - path identification number
+ *        trgcls - specifies target class
+ *        srccls - specifies the source message class
+ *        msgtag - specifies a tag to be associated with the message
+ *        flags1 - option for path
+ *                 IPPRTY- specifies if you want to send priority message
+ *        prmmsg - 8-bytes of data to be placed into parameter list
+ * Output: msgid - specifies the message ID.
+ * Return: b2f0_result - return code from CP
+*/
+int
+iucv_send_prmmsg (__u16 pathid,
+		  __u32 * msgid,
+		  __u32 trgcls,
+		  __u32 srccls, __u32 msgtag, int flags1, __u8 prmmsg[8])
+{
+	iparml_dpl *parm;
+	ulong b2f0_result;
+
+	iucv_debug(2, "entering");
+
+	parm = (iparml_dpl *)grab_param();
+
+	parm->ippathid = pathid;
+	parm->iptrgcls = trgcls;
+	parm->ipsrccls = srccls;
+	parm->ipmsgtag = msgtag;
+	parm->ipflags1 = (IPRMDATA | IPNORPY | flags1);
+	memcpy(parm->iprmmsg, prmmsg, sizeof(parm->iprmmsg));
+
+	b2f0_result = b2f0(SEND, parm);
+
+	if ((!b2f0_result) && (msgid))
+		*msgid = parm->ipmsgid;
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_send2way
+ * Purpose: This function transmits data to another application.
+ *          Data to be transmitted is in a buffer. The receiver
+ *          of the send is expected to reply to the message and
+ *          a buffer is provided into which IUCV moves the reply
+ *          to this message.
+ * Input: pathid - path identification number
+ *        trgcls - specifies target class
+ *        srccls - specifies the source message class
+ *        msgtag - specifies a tag associated with the message
+ *        flags1 - option for path
+ *                 IPPRTY- specifies if you want to send priority message
+ *        buffer - address of send buffer
+ *        buflen - length of send buffer
+ *        ansbuf - address of buffer to reply with
+ *        anslen - length of buffer to reply with
+ * Output: msgid - specifies the message ID.
+ * Return: b2f0_result - return code from CP
+ *         (-EINVAL) - buffer or ansbuf address is NULL
+ */
+int
+iucv_send2way (__u16 pathid,
+	       __u32 * msgid,
+	       __u32 trgcls,
+	       __u32 srccls,
+	       __u32 msgtag,
+	       int flags1,
+	       void *buffer, ulong buflen, void *ansbuf, ulong anslen)
+{
+	iparml_db *parm;
+	ulong b2f0_result;
+
+	iucv_debug(2, "entering");
+
+	if (!buffer || !ansbuf)
+		return -EINVAL;
+
+	parm = (iparml_db *)grab_param();
+
+	parm->ippathid = pathid;
+	parm->iptrgcls = trgcls;
+	parm->ipbfadr1 = (__u32) ((ulong) buffer);
+	parm->ipbfln1f = (__u32) buflen;	/* length of message */
+	parm->ipbfadr2 = (__u32) ((ulong) ansbuf);
+	parm->ipbfln2f = (__u32) anslen;
+	parm->ipsrccls = srccls;
+	parm->ipmsgtag = msgtag;
+	parm->ipflags1 = flags1;	/* priority message */
+
+	b2f0_result = b2f0(SEND, parm);
+
+	if ((!b2f0_result) && (msgid))
+		*msgid = parm->ipmsgid;
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_send2way_array
+ * Purpose: This function transmits data to another application.
+ *          The contents of buffer is the address of the array of
+ *          addresses and lengths of discontiguous buffers that hold
+ *          the message text. The receiver of the send is expected to
+ *          reply to the message and a buffer is provided into which
+ *          IUCV moves the reply to this message.
+ * Input: pathid - path identification number
+ *        trgcls - specifies target class
+ *        srccls - specifies the source message class
+ *        msgtag - spcifies a tag to be associated with the message
+ *        flags1 - option for path
+ *                 IPPRTY- specifies if you want to send priority message
+ *        buffer - address of array of send buffers
+ *        buflen - total length of send buffers
+ *        ansbuf - address of buffer to reply with
+ *        anslen - length of buffer to reply with
+ * Output: msgid - specifies the message ID.
+ * Return: b2f0_result - return code from CP
+ *         (-EINVAL) - buffer address is NULL
+ */
+int
+iucv_send2way_array (__u16 pathid,
+		     __u32 * msgid,
+		     __u32 trgcls,
+		     __u32 srccls,
+		     __u32 msgtag,
+		     int flags1,
+		     iucv_array_t * buffer,
+		     ulong buflen, iucv_array_t * ansbuf, ulong anslen)
+{
+	iparml_db *parm;
+	ulong b2f0_result;
+
+	iucv_debug(2, "entering");
+
+	if (!buffer || !ansbuf)
+		return -EINVAL;
+
+	parm = (iparml_db *)grab_param();
+
+	parm->ippathid = pathid;
+	parm->iptrgcls = trgcls;
+	parm->ipbfadr1 = (__u32) ((ulong) buffer);
+	parm->ipbfln1f = (__u32) buflen;	/* length of message */
+	parm->ipbfadr2 = (__u32) ((ulong) ansbuf);
+	parm->ipbfln2f = (__u32) anslen;
+	parm->ipsrccls = srccls;
+	parm->ipmsgtag = msgtag;
+	parm->ipflags1 = (IPBUFLST | IPANSLST | flags1);
+	b2f0_result = b2f0(SEND, parm);
+	if ((!b2f0_result) && (msgid))
+		*msgid = parm->ipmsgid;
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_send2way_prmmsg
+ * Purpose: This function transmits data to another application.
+ *          Prmmsg specifies that the 8-bytes of data are to be moved
+ *          into the parameter list. This is a two-way message and the
+ *          receiver of the message is expected to reply. A buffer
+ *          is provided into which IUCV moves the reply to this
+ *          message.
+ * Input: pathid - path identification number
+ *        trgcls - specifies target class
+ *        srccls - specifies the source message class
+ *        msgtag - specifies a tag to be associated with the message
+ *        flags1 - option for path
+ *                 IPPRTY- specifies if you want to send priority message
+ *        prmmsg - 8-bytes of data to be placed in parameter list
+ *        ansbuf - address of buffer to reply with
+ *        anslen - length of buffer to reply with
+ * Output: msgid - specifies the message ID.
+ * Return: b2f0_result - return code from CP
+ *         (-EINVAL) - buffer address is NULL
+*/
+int
+iucv_send2way_prmmsg (__u16 pathid,
+		      __u32 * msgid,
+		      __u32 trgcls,
+		      __u32 srccls,
+		      __u32 msgtag,
+		      ulong flags1, __u8 prmmsg[8], void *ansbuf, ulong anslen)
+{
+	iparml_dpl *parm;
+	ulong b2f0_result;
+
+	iucv_debug(2, "entering");
+
+	if (!ansbuf)
+		return -EINVAL;
+
+	parm = (iparml_dpl *)grab_param();
+
+	parm->ippathid = pathid;
+	parm->iptrgcls = trgcls;
+	parm->ipsrccls = srccls;
+	parm->ipmsgtag = msgtag;
+	parm->ipbfadr2 = (__u32) ((ulong) ansbuf);
+	parm->ipbfln2f = (__u32) anslen;
+	parm->ipflags1 = (IPRMDATA | flags1);	/* message in prmlist */
+	memcpy(parm->iprmmsg, prmmsg, sizeof(parm->iprmmsg));
+
+	b2f0_result = b2f0(SEND, parm);
+
+	if ((!b2f0_result) && (msgid))
+		*msgid = parm->ipmsgid;
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+
+	return b2f0_result;
+}
+
+/*
+ * Name: iucv_send2way_prmmsg_array
+ * Purpose: This function transmits data to another application.
+ *          Prmmsg specifies that the 8-bytes of data are to be moved
+ *          into the parameter list. This is a two-way message and the
+ *          receiver of the message is expected to reply. A buffer
+ *          is provided into which IUCV moves the reply to this
+ *          message. The contents of ansbuf is the address of the
+ *          array of addresses and lengths of discontiguous buffers
+ *          that contain the reply.
+ * Input: pathid - path identification number
+ *        trgcls - specifies target class
+ *        srccls - specifies the source message class
+ *        msgtag - specifies a tag to be associated with the message
+ *        flags1 - option for path
+ *                 IPPRTY- specifies if you want to send priority message
+ *        prmmsg - 8-bytes of data to be placed into the parameter list
+ *        ansbuf - address of buffer to reply with
+ *        anslen - length of buffer to reply with
+ * Output: msgid - specifies the message ID.
+ * Return: b2f0_result - return code from CP
+ *         (-EINVAL) - ansbuf address is NULL
+ */
+int
+iucv_send2way_prmmsg_array (__u16 pathid,
+			    __u32 * msgid,
+			    __u32 trgcls,
+			    __u32 srccls,
+			    __u32 msgtag,
+			    int flags1,
+			    __u8 prmmsg[8],
+			    iucv_array_t * ansbuf, ulong anslen)
+{
+	iparml_dpl *parm;
+	ulong b2f0_result;
+
+	iucv_debug(2, "entering");
+
+	if (!ansbuf)
+		return -EINVAL;
+
+	parm = (iparml_dpl *)grab_param();
+
+	parm->ippathid = pathid;
+	parm->iptrgcls = trgcls;
+	parm->ipsrccls = srccls;
+	parm->ipmsgtag = msgtag;
+	parm->ipbfadr2 = (__u32) ((ulong) ansbuf);
+	parm->ipbfln2f = (__u32) anslen;
+	parm->ipflags1 = (IPRMDATA | IPANSLST | flags1);
+	memcpy(parm->iprmmsg, prmmsg, sizeof(parm->iprmmsg));
+	b2f0_result = b2f0(SEND, parm);
+	if ((!b2f0_result) && (msgid))
+		*msgid = parm->ipmsgid;
+	release_param(parm);
+
+	iucv_debug(2, "exiting");
+	return b2f0_result;
+}
+
+void
+iucv_setmask_cpuid (void *result)
+{
+        iparml_set_mask *parm;
+
+        iucv_debug(1, "entering");
+        parm = (iparml_set_mask *)grab_param();
+        parm->ipmask = *((__u8*)result);
+        *((ulong *)result) = b2f0(SETMASK, parm);
+        release_param(parm);
+
+        iucv_debug(1, "b2f0_result = %ld", *((ulong *)result));
+        iucv_debug(1, "exiting");
+}
+
+/*
+ * Name: iucv_setmask
+ * Purpose: This function enables or disables the following IUCV
+ *          external interruptions: Nonpriority and priority message
+ *          interrupts, nonpriority and priority reply interrupts.
+ * Input: SetMaskFlag - options for interrupts
+ *           0x80 - Nonpriority_MessagePendingInterruptsFlag
+ *           0x40 - Priority_MessagePendingInterruptsFlag
+ *           0x20 - Nonpriority_MessageCompletionInterruptsFlag
+ *           0x10 - Priority_MessageCompletionInterruptsFlag
+ *           0x08 - IUCVControlInterruptsFlag
+ * Output: NA
+ * Return: b2f0_result - return code from CP
+*/
+int
+iucv_setmask (int SetMaskFlag)
+{
+	union {
+		ulong result;
+		__u8  param;
+	} u;
+	int cpu;
+
+	u.param = SetMaskFlag;
+	cpu = get_cpu();
+	smp_call_function_on(iucv_setmask_cpuid, &u, 0, 1, iucv_cpuid);
+	put_cpu();
+
+	return u.result;
+}
+
+/**
+ * iucv_sever:
+ * @pathid:    Path identification number
+ * @user_data: 16-byte of user data
+ *
+ * This function terminates an iucv path.
+ * Returns: return code from CP
+ */
+int
+iucv_sever(__u16 pathid, __u8 user_data[16])
+{
+	iparml_control *parm;
+	ulong b2f0_result = 0;
+
+	iucv_debug(1, "entering");
+	parm = (iparml_control *)grab_param();
+
+	memcpy(parm->ipuser, user_data, sizeof(parm->ipuser));
+	parm->ippathid = pathid;
+
+	b2f0_result = b2f0(SEVER, parm);
+
+	if (!b2f0_result)
+		iucv_remove_pathid(pathid);
+	release_param(parm);
+
+	iucv_debug(1, "exiting");
+	return b2f0_result;
+}
+
+/*
+ * Interrupt Handlers
+ *******************************************************************************/
+
+/**
+ * iucv_irq_handler:
+ * @regs: Current registers
+ * @code: irq code
+ *
+ * Handles external interrupts coming in from CP.
+ * Places the interrupt buffer on a queue and schedules iucv_tasklet_handler().
+ */
+static void
+iucv_irq_handler(struct pt_regs *regs, __u16 code)
+{
+	iucv_irqdata *irqdata;
+
+	irqdata = kmalloc(sizeof(iucv_irqdata), GFP_ATOMIC);
+	if (!irqdata) {
+		printk(KERN_WARNING "%s: out of memory\n", __FUNCTION__);
+		return;
+	}
+
+	memcpy(&irqdata->data, iucv_external_int_buffer,
+	       sizeof(iucv_GeneralInterrupt));
+
+	spin_lock(&iucv_irq_queue_lock);
+	list_add_tail(&irqdata->queue, &iucv_irq_queue);
+	spin_unlock(&iucv_irq_queue_lock);
+
+	tasklet_schedule(&iucv_tasklet);
+}
+
+/**
+ * iucv_do_int:
+ * @int_buf: Pointer to copy of external interrupt buffer
+ *
+ * The workhorse for handling interrupts queued by iucv_irq_handler().
+ * This function is called from the bottom half iucv_tasklet_handler().
+ */
+static void
+iucv_do_int(iucv_GeneralInterrupt * int_buf)
+{
+	handler *h = NULL;
+	struct list_head *lh;
+	ulong flags;
+	iucv_interrupt_ops_t *interrupt = NULL;	/* interrupt addresses */
+	__u8 temp_buff1[24], temp_buff2[24];	/* masked handler id. */
+	int rc = 0, j = 0;
+	__u8 no_listener[16] = "NO LISTENER";
+
+	iucv_debug(2, "entering, pathid %d, type %02X",
+		 int_buf->ippathid, int_buf->iptype);
+	iucv_dumpit("External Interrupt Buffer:",
+		    int_buf, sizeof(iucv_GeneralInterrupt));
+
+	ASCEBC (no_listener, 16);
+
+	if (int_buf->iptype != 01) {
+		if ((int_buf->ippathid) > (max_connections - 1)) {
+			printk(KERN_WARNING "%s: Got interrupt with pathid %d"
+			       " > max_connections (%ld)\n", __FUNCTION__,
+			       int_buf->ippathid, max_connections - 1);
+		} else {
+			h = iucv_pathid_table[int_buf->ippathid];
+			interrupt = h->interrupt_table;
+			iucv_dumpit("Handler:", h, sizeof(handler));
+		}
+	}
+
+	/* end of if statement */
+	switch (int_buf->iptype) {
+		case 0x01:		/* connection pending */
+			if (messagesDisabled) {
+			    iucv_setmask(~0);
+			    messagesDisabled = 0;
+			}
+			spin_lock_irqsave(&iucv_lock, flags);
+			list_for_each(lh, &iucv_handler_table) {
+				h = list_entry(lh, handler, list);
+				memcpy(temp_buff1, &(int_buf->ipvmid), 24);
+				memcpy(temp_buff2, &(h->id.userid), 24);
+				for (j = 0; j < 24; j++) {
+					temp_buff1[j] &= (h->id.mask)[j];
+					temp_buff2[j] &= (h->id.mask)[j];
+				}
+				
+				iucv_dumpit("temp_buff1:",
+					    temp_buff1, sizeof(temp_buff1));
+				iucv_dumpit("temp_buff2",
+					    temp_buff2, sizeof(temp_buff2));
+				
+				if (!memcmp (temp_buff1, temp_buff2, 24)) {
+					
+					iucv_debug(2,
+						   "found a matching handler");
+					break;
+				} else
+					h = NULL;
+			}
+			spin_unlock_irqrestore (&iucv_lock, flags);
+			if (h) {
+				/* ADD PATH TO PATHID TABLE */
+				rc = iucv_add_pathid(int_buf->ippathid, h);
+				if (rc) {
+					iucv_sever (int_buf->ippathid,
+						    no_listener);
+					iucv_debug(1,
+						   "add_pathid failed, rc = %d",
+						   rc);
+				} else {
+					interrupt = h->interrupt_table;
+					if (interrupt->ConnectionPending) {
+						EBCASC (int_buf->ipvmid, 8);
+						interrupt->ConnectionPending(
+							(iucv_ConnectionPending *)int_buf,
+							h->pgm_data);
+					} else
+						iucv_sever(int_buf->ippathid,
+							   no_listener);
+				}
+			} else
+				iucv_sever(int_buf->ippathid, no_listener);
+			break;
+			
+		case 0x02:		/*connection complete */
+			if (messagesDisabled) {
+			    iucv_setmask(~0);
+			    messagesDisabled = 0;
+			}
+			if (h) {
+				if (interrupt->ConnectionComplete)
+				{
+					interrupt->ConnectionComplete(
+						(iucv_ConnectionComplete *)int_buf,
+						h->pgm_data);
+				}
+				else
+					iucv_debug(1,
+						   "ConnectionComplete not called");
+			} else
+				iucv_sever(int_buf->ippathid, no_listener);
+			break;
+			
+		case 0x03:		/* connection severed */
+			if (messagesDisabled) {
+			    iucv_setmask(~0);
+			    messagesDisabled = 0;
+			}
+			if (h) {
+				if (interrupt->ConnectionSevered)
+					interrupt->ConnectionSevered(
+						(iucv_ConnectionSevered *)int_buf,
+						h->pgm_data);
+				
+				else
+					iucv_sever (int_buf->ippathid, no_listener);
+			} else
+				iucv_sever(int_buf->ippathid, no_listener);
+			break;
+			
+		case 0x04:		/* connection quiesced */
+			if (messagesDisabled) {
+			    iucv_setmask(~0);
+			    messagesDisabled = 0;
+			}
+			if (h) {
+				if (interrupt->ConnectionQuiesced)
+					interrupt->ConnectionQuiesced(
+						(iucv_ConnectionQuiesced *)int_buf,
+						h->pgm_data);
+				else
+					iucv_debug(1,
+						   "ConnectionQuiesced not called");
+			}
+			break;
+			
+		case 0x05:		/* connection resumed */
+			if (messagesDisabled) {
+			    iucv_setmask(~0);
+			    messagesDisabled = 0;
+			}
+			if (h) {
+				if (interrupt->ConnectionResumed)
+					interrupt->ConnectionResumed(
+						(iucv_ConnectionResumed *)int_buf,
+						h->pgm_data);
+				else
+					iucv_debug(1,
+						   "ConnectionResumed not called");
+			}
+			break;
+			
+		case 0x06:		/* priority message complete */
+		case 0x07:		/* nonpriority message complete */
+			if (h) {
+				if (interrupt->MessageComplete)
+					interrupt->MessageComplete(
+						(iucv_MessageComplete *)int_buf,
+						h->pgm_data);
+				else
+					iucv_debug(2,
+						   "MessageComplete not called");
+			}
+			break;
+			
+		case 0x08:		/* priority message pending  */
+		case 0x09:		/* nonpriority message pending  */
+			if (h) {
+				if (interrupt->MessagePending)
+					interrupt->MessagePending(
+						(iucv_MessagePending *) int_buf,
+						h->pgm_data);
+				else
+					iucv_debug(2,
+						   "MessagePending not called");
+			}
+			break;
+		default:		/* unknown iucv type */
+			printk(KERN_WARNING "%s: unknown iucv interrupt\n",
+			       __FUNCTION__);
+			break;
+	}			/* end switch */
+	
+	iucv_debug(2, "exiting pathid %d, type %02X",
+		 int_buf->ippathid, int_buf->iptype);
+
+	return;
+}
+
+/**
+ * iucv_tasklet_handler:
+ *
+ * This function loops over the queue of irq buffers and runs iucv_do_int()
+ * on every queue element.
+ */
+static void
+iucv_tasklet_handler(unsigned long ignored)
+{
+	struct list_head head;
+	struct list_head *next;
+	ulong  flags;
+
+	spin_lock_irqsave(&iucv_irq_queue_lock, flags);
+	list_add(&head, &iucv_irq_queue);
+	list_del_init(&iucv_irq_queue);
+	spin_unlock_irqrestore (&iucv_irq_queue_lock, flags);
+
+	next = head.next;
+	while (next != &head) {
+		iucv_irqdata *p = list_entry(next, iucv_irqdata, queue);
+
+		next = next->next;
+		iucv_do_int(&p->data);
+		kfree(p);
+	}
+
+	return;
+}
+
+subsys_initcall(iucv_init);
+module_exit(iucv_exit);
+
+/**
+ * Export all public stuff
+ */
+EXPORT_SYMBOL (iucv_bus);
+EXPORT_SYMBOL (iucv_root);
+EXPORT_SYMBOL (iucv_accept);
+EXPORT_SYMBOL (iucv_connect);
+#if 0
+EXPORT_SYMBOL (iucv_purge);
+EXPORT_SYMBOL (iucv_query_maxconn);
+EXPORT_SYMBOL (iucv_query_bufsize);
+EXPORT_SYMBOL (iucv_quiesce);
+#endif
+EXPORT_SYMBOL (iucv_receive);
+#if 0
+EXPORT_SYMBOL (iucv_receive_array);
+#endif
+EXPORT_SYMBOL (iucv_reject);
+#if 0
+EXPORT_SYMBOL (iucv_reply);
+EXPORT_SYMBOL (iucv_reply_array);
+EXPORT_SYMBOL (iucv_resume);
+#endif
+EXPORT_SYMBOL (iucv_reply_prmmsg);
+EXPORT_SYMBOL (iucv_send);
+#if 0
+EXPORT_SYMBOL (iucv_send2way);
+EXPORT_SYMBOL (iucv_send2way_array);
+EXPORT_SYMBOL (iucv_send_array);
+EXPORT_SYMBOL (iucv_send2way_prmmsg);
+EXPORT_SYMBOL (iucv_send2way_prmmsg_array);
+EXPORT_SYMBOL (iucv_send_prmmsg);
+EXPORT_SYMBOL (iucv_setmask);
+#endif
+EXPORT_SYMBOL (iucv_sever);
+EXPORT_SYMBOL (iucv_register_program);
+EXPORT_SYMBOL (iucv_unregister_program);