--- old/usr/src/uts/common/vm/xhat.c	2015-05-08 18:02:56.142198302 -0400
+++ /dev/null	2015-05-08 18:02:56.000000000 -0400
@@ -1,555 +0,0 @@
-/*
- * CDDL HEADER START
- *
- * The contents of this file are subject to the terms of the
- * Common Development and Distribution License, Version 1.0 only
- * (the "License").  You may not use this file except in compliance
- * with the License.
- *
- * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
- * See the License for the specific language governing permissions
- * and limitations under the License.
- *
- * When distributing Covered Code, include this CDDL HEADER in each
- * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
- * If applicable, add the following below this CDDL HEADER, with the
- * fields enclosed by brackets "[]" replaced with your own identifying
- * information: Portions Copyright [yyyy] [name of copyright owner]
- *
- * CDDL HEADER END
- */
-/*
- * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
- */
-
-#pragma ident	"%Z%%M%	%I%	%E% SMI"
-
-
-#include <sys/types.h>
-#include <sys/cmn_err.h>
-#include <sys/mman.h>
-#include <sys/systm.h>
-#include <vm/xhat.h>
-#include <vm/page.h>
-#include <vm/as.h>
-
-int xhat_debug = 0;
-
-krwlock_t xhat_provider_rwlock;
-xhat_provider_t *xhat_provider = NULL;
-
-void
-xhat_init()
-{
-	rw_init(&xhat_provider_rwlock, NULL, RW_DEFAULT, NULL);
-}
-
-
-
-int
-xhat_provider_register(xhat_provider_t *provider)
-{
-	/* strlen("_cache") = 7 */
-	char	cache_name[XHAT_CACHE_NAMELEN + 7];
-
-
-	if (provider->xhat_provider_version != XHAT_PROVIDER_VERSION) {
-		cmn_err(CE_WARN, "XHAT provider version mismatch");
-		return (-1);
-	}
-
-	if ((XHAT_POPS(provider)->xhat_alloc == NULL) ||
-	    (XHAT_POPS(provider)->xhat_free == NULL)) {
-		cmn_err(CE_WARN, "Malformed XHAT provider");
-		return (-1);
-	}
-
-	/* Allocate kmem_cache which will manage xhat blocks */
-	provider->xblkcache->free_blks = NULL;
-	(void) strncpy(cache_name, provider->xhat_provider_name,
-	    XHAT_CACHE_NAMELEN);
-	(void) strcat(cache_name, "_cache");
-	provider->xblkcache->cache = kmem_cache_create(cache_name,
-	    provider->xhat_provider_blk_size, 0, NULL, NULL,
-	    provider->xblkcache->reclaim,
-	    (void *)provider, NULL, 0);
-	if (provider->xblkcache->cache == NULL) {
-		cmn_err(CE_WARN, "Failed to allocate cache for %s",
-		    provider->xhat_provider_name);
-		return (-1);
-	}
-
-	mutex_init(&provider->xblkcache->lock, NULL, MUTEX_DEFAULT, NULL);
-
-
-	/* Insert provider in the global list */
-	rw_enter(&xhat_provider_rwlock, RW_WRITER);
-	provider->next = xhat_provider;
-	provider->prev = NULL;
-	if (xhat_provider)
-		xhat_provider->prev = provider;
-	xhat_provider = provider;
-	xhat_provider->xhat_provider_refcnt = 0;
-	rw_exit(&xhat_provider_rwlock);
-	return (0);
-}
-
-
-
-int
-xhat_provider_unregister(xhat_provider_t *provider)
-{
-	if (provider->xhat_provider_version != XHAT_PROVIDER_VERSION)
-		return (-1);
-
-	rw_enter(&xhat_provider_rwlock, RW_WRITER);
-
-	if (provider->xhat_provider_refcnt) {
-		rw_exit(&xhat_provider_rwlock);
-		return (-1);
-	}
-
-	if (provider->next)
-		provider->next->prev = provider->prev;
-	if (provider->prev)
-		provider->prev->next = provider->next;
-	else
-		xhat_provider = provider->next;
-	provider->prev = NULL;
-	provider->next = NULL;
-	rw_exit(&xhat_provider_rwlock);
-
-	/* Free all xblks that are sitting on free_blks list */
-	provider->xblkcache->reclaim(provider);
-
-	kmem_cache_destroy(provider->xblkcache->cache);
-
-	return (0);
-}
-
-
-
-/* Attaches an XHAT to the address space */
-int
-xhat_attach_xhat(xhat_provider_t *provider, struct as *as,
-    struct xhat **xhatp, void *arg)
-{
-	struct xhat *xh;
-
-
-
-	xh = XHAT_POPS(provider)->xhat_alloc(arg);
-	if (xh == NULL) {
-		*xhatp = NULL;
-		return (XH_PRVDR);
-	}
-
-	mutex_init(&xh->xhat_lock, NULL, MUTEX_DEFAULT, NULL);
-	xh->xhat_provider = provider;
-
-	rw_enter(&xhat_provider_rwlock, RW_WRITER);
-	provider->xhat_provider_refcnt++;
-	rw_exit(&xhat_provider_rwlock);
-
-	mutex_enter(&as->a_contents);
-
-	/* Is address space busy (being freed, dup'd or swapped)? */
-	if (AS_ISBUSY(as)) {
-		mutex_exit(&as->a_contents);
-		XHAT_POPS(provider)->xhat_free(xh);
-
-		rw_enter(&xhat_provider_rwlock, RW_WRITER);
-		provider->xhat_provider_refcnt--;
-		rw_exit(&xhat_provider_rwlock);
-
-		*xhatp = NULL;
-		return (XH_ASBUSY);
-	}
-
-	xh->xhat_as = as;
-	xh->xhat_refcnt = 0;
-	xh->holder = NULL;
-	xh->arg = arg;
-	xh->next = (struct xhat *)as->a_xhat;
-	if (xh->next)
-		xh->next->prev = xh;
-	as->a_xhat = xh;
-	mutex_exit(&as->a_contents);
-	*xhatp = xh;
-	return (0);
-}
-
-
-int
-xhat_detach_xhat(xhat_provider_t *provider, struct as *as)
-{
-	struct xhat *xh;
-
-
-	mutex_enter(&as->a_contents);
-
-	for (xh = (struct xhat *)as->a_xhat; xh != NULL; xh = xh->next)
-		if (xh->xhat_provider == provider) {
-
-
-			if (xh->holder != NULL) {
-				/*
-				 * The address space is being freed,
-				 * dup'd or swapped out.
-				 * If we are the thread which doing one
-				 * of those operations, we can go ahead
-				 * and free up the XHAT.
-				 * Otherwise, return.
-				 */
-				if (xh->holder != curthread) {
-					mutex_exit(&as->a_contents);
-					return (XH_ASBUSY);
-				} else
-					xhat_hat_rele(xh);
-			}
-
-			if (xh->xhat_refcnt > 0) {
-				/*
-				 * There are still "users" of the XHAT.
-				 * This may be either because the caller
-				 * forgot to free something up (which is a bug)
-				 * or because xhat_op_all() is in progress.
-				 * Since we are not allowing any of
-				 * xhat_op_all's ops to call xhat_detach_xhat(),
-				 * This can only be some other thread. It
-				 * may want to wait a bit and retry.
-				 */
-
-
-				/* Restore the hold on the XHAT */
-				if (xh->holder == curthread)
-					xhat_hat_hold(xh);
-
-				mutex_exit(&as->a_contents);
-				return (XH_XHHELD);
-			}
-
-			rw_enter(&xhat_provider_rwlock, RW_WRITER);
-			provider->xhat_provider_refcnt--;
-			rw_exit(&xhat_provider_rwlock);
-
-			if (xh->next)
-				xh->next->prev = xh->prev;
-			if (xh->prev)
-				xh->prev->next = xh->next;
-			else
-				as->a_xhat = (void *) xh->next;
-			mutex_exit(&as->a_contents);
-
-			XHAT_POPS(provider)->xhat_free(xh);
-
-			return (0);
-		}
-	mutex_exit(&as->a_contents);
-	return (XH_NOTATTCHD);
-}
-
-void
-xhat_hat_hold(struct xhat *xhat)
-{
-	mutex_enter(&xhat->xhat_lock);
-	xhat->xhat_refcnt++;
-	mutex_exit(&xhat->xhat_lock);
-}
-
-void
-xhat_hat_rele(struct xhat *xhat)
-{
-	mutex_enter(&xhat->xhat_lock);
-	xhat->xhat_refcnt--;
-	ASSERT(xhat->xhat_refcnt >= 0);
-	mutex_exit(&xhat->xhat_lock);
-}
-
-
-int
-xhat_hat_holders(struct xhat *xhat)
-{
-	return (xhat->xhat_refcnt);
-}
-
-
-/*
- * Assumes that address space is already locked
- * and that AS_FREE is set for as->a_flags.
- */
-void
-xhat_free_start_all(struct as *as)
-{
-	struct xhat *xh, *xh_nxt;
-
-
-	ASSERT(AS_ISBUSY(as));
-
-	mutex_enter(&as->a_contents);
-	xh = (struct xhat *)as->a_xhat;
-
-	/*
-	 * Simply calling xhat_hat_hold() won't work because we will
-	 * not be able to succeed in xhat_detach_xhat(), which may
-	 * get called from here. We need to know _who_ the holder is.
-	 */
-	if (xh != NULL) {
-		xhat_hat_hold(xh);
-		ASSERT(xh->holder == NULL);
-		xh->holder = curthread;
-	}
-
-	while (xh != NULL) {
-
-		xh_nxt = xh->next;
-		if (xh_nxt != NULL) {
-			ASSERT(xh_nxt->holder == NULL);
-			xhat_hat_hold(xh_nxt);
-			xh_nxt->holder = curthread;
-		}
-
-		mutex_exit(&as->a_contents);
-
-		XHAT_FREE_START(xh);
-
-		mutex_enter(&as->a_contents);
-
-		xh = xh_nxt;
-	}
-
-	mutex_exit(&as->a_contents);
-}
-
-
-
-/*
- * Assumes that address space is already locked.
- * Since xhat_free_start_all() must have been called
- * earlier, for all XHATs holder is set to curthread.
- * Also, since AS_BUSY is set for as->a_flags, no new
- * XHATs could have been added.
- */
-void
-xhat_free_end_all(struct as *as)
-{
-
-	struct xhat *xh, *xh_nxt;
-
-	ASSERT(AS_ISBUSY(as));
-
-	mutex_enter(&as->a_contents);
-	xh = (struct xhat *)as->a_xhat;
-
-
-	while (xh != NULL) {
-
-		ASSERT(xh->holder == curthread);
-
-		xh_nxt = xh->next;
-
-		mutex_exit(&as->a_contents);
-
-		XHAT_FREE_END(xh);
-
-		mutex_enter(&as->a_contents);
-
-		xh = xh_nxt;
-	}
-
-	mutex_exit(&as->a_contents);
-}
-
-
-/* Assumes that address space is already locked */
-
-/* ARGSUSED */
-int
-xhat_dup_all(struct as *as, struct as *newas, caddr_t addr, size_t len,
-    uint_t flag)
-{
-	/* This is not supported. Should we return some sort of error? */
-
-	ASSERT(AS_ISBUSY(as));
-
-	return (0);
-}
-
-
-/* Assumes that address space is already locked */
-void
-xhat_swapout_all(struct as *as)
-{
-	struct xhat *xh, *xh_nxt;
-
-
-	ASSERT(AS_ISBUSY(as));
-
-	mutex_enter(&as->a_contents);
-	xh = (struct xhat *)as->a_xhat;
-
-	if (xh != NULL) {
-		xhat_hat_hold(xh);
-		ASSERT(xh->holder == NULL);
-		xh->holder = curthread;
-	}
-
-
-	while (xh != NULL) {
-
-		xh_nxt = xh->next;
-		if (xh_nxt != NULL) {
-			ASSERT(xh_nxt->holder == NULL);
-			xhat_hat_hold(xh_nxt);
-			xh_nxt->holder = curthread;
-		}
-
-		mutex_exit(&as->a_contents);
-
-		XHAT_SWAPOUT(xh);
-
-		mutex_enter(&as->a_contents);
-
-		/*
-		 * If the xh is still there (i.e. swapout did not
-		 * destroy it), clear the holder field.
-		 * xh_nxt->prev couldn't have been changed in xhat_attach_xhat()
-		 * because AS_BUSY is set. xhat_detach_xhat() also couldn't
-		 * have modified it because (holder != NULL).
-		 * If there is only one XHAT, just see if a_xhat still
-		 * points to us.
-		 */
-		if (((xh_nxt != NULL) && (xh_nxt->prev == xh)) ||
-		    ((as->a_xhat != NULL) && (as->a_xhat == xh))) {
-			xhat_hat_rele(xh);
-			xh->holder = NULL;
-		}
-
-		xh = xh_nxt;
-	}
-
-	mutex_exit(&as->a_contents);
-}
-
-
-
-
-/*
- * In the following routines, the appropriate xhat_op
- * should never attempt to call xhat_detach_xhat(): it will
- * never succeed since the XHAT is held.
- */
-
-
-#define	XHAT_UNLOAD_CALLBACK_OP	(0)
-#define	XHAT_SETATTR_OP		(1)
-#define	XHAT_CLRATTR_OP		(2)
-#define	XHAT_CHGATTR_OP		(3)
-#define	XHAT_CHGPROT_OP		(4)
-#define	XHAT_UNSHARE_OP		(5)
-
-
-static void
-xhat_op_all(int op, struct as *as, caddr_t addr,
-    size_t len, uint_t flags, void *ptr)
-{
-	struct xhat *xh, *xh_nxt;
-
-	mutex_enter(&as->a_contents);
-	xh = (struct xhat *)as->a_xhat;
-
-	while (xh != NULL) {
-
-		xhat_hat_hold(xh);
-
-		xh_nxt = xh->next;
-		if (xh_nxt != NULL)
-			xhat_hat_hold(xh_nxt);
-
-		mutex_exit(&as->a_contents);
-
-		switch (op) {
-		case XHAT_UNLOAD_CALLBACK_OP:
-			XHAT_UNLOAD_CALLBACK(xh, addr,
-			    len, flags, (hat_callback_t *)ptr);
-			break;
-		case XHAT_SETATTR_OP:
-			XHAT_SETATTR(xh, addr, len, flags);
-			break;
-		case XHAT_CLRATTR_OP:
-			XHAT_CLRATTR(xh, addr, len, flags);
-			break;
-		case XHAT_CHGATTR_OP:
-			XHAT_CHGATTR(xh, addr, len, flags);
-			break;
-		case XHAT_CHGPROT_OP:
-			XHAT_CHGPROT(xh, addr, len, flags);
-			break;
-		case XHAT_UNSHARE_OP:
-			XHAT_UNSHARE(xh, addr, len);
-			break;
-		default:
-			panic("Unknown op %d in xhat_op_all", op);
-		}
-
-		mutex_enter(&as->a_contents);
-
-		/*
-		 * Both pointers are still valid because both
-		 * XHATs are held.
-		 */
-		xhat_hat_rele(xh);
-		if (xh_nxt != NULL)
-			xhat_hat_rele(xh_nxt);
-		xh = xh_nxt;
-	}
-
-	mutex_exit(&as->a_contents);
-}
-
-
-
-void
-xhat_unload_callback_all(struct as *as, caddr_t addr, size_t len, uint_t flags,
-    hat_callback_t *callback)
-{
-	xhat_op_all(XHAT_UNLOAD_CALLBACK_OP, as, addr, len, flags, callback);
-}
-
-
-void
-xhat_setattr_all(struct as *as, caddr_t addr, size_t len, uint_t attr)
-{
-	xhat_op_all(XHAT_SETATTR_OP, as, addr, len, attr, NULL);
-}
-
-
-
-void
-xhat_clrattr_all(struct as *as, caddr_t addr, size_t len, uint_t attr)
-{
-	xhat_op_all(XHAT_CLRATTR_OP, as, addr, len, attr, NULL);
-}
-
-
-void
-xhat_chgattr_all(struct as *as, caddr_t addr, size_t len, uint_t attr)
-{
-	xhat_op_all(XHAT_CHGATTR_OP, as, addr, len, attr, NULL);
-}
-
-
-void
-xhat_chgprot_all(struct as *as, caddr_t addr, size_t len, uint_t prot)
-{
-	xhat_op_all(XHAT_CHGPROT_OP, as, addr, len, prot, NULL);
-}
-
-
-void
-xhat_unshare_all(struct as *as, caddr_t addr, size_t len)
-{
-	xhat_op_all(XHAT_UNSHARE_OP, as, addr, len, 0, NULL);
-}
