1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/hold_page.h> 30 31 #if defined(__xpv) 32 #include <sys/hypervisor.h> 33 #endif 34 35 /*ARGSUSED*/ 36 int 37 plat_hold_page(pfn_t pfn, int lock, page_t **pp_ret) 38 { 39 #if defined(__xpv) 40 page_t *pp = page_numtopp_nolock(pfn); 41 42 if (pp == NULL) 43 return (PLAT_HOLD_FAIL); 44 45 if (lock == PLAT_HOLD_LOCK) { 46 ASSERT(pp_ret != NULL); 47 if (page_trylock(pp, SE_EXCL) == 0) 48 return (PLAT_HOLD_FAIL); 49 } 50 51 if (mfn_list[pfn] == MFN_INVALID) { 52 /* We failed - release the lock if we grabbed it earlier */ 53 if (lock == PLAT_HOLD_LOCK) { 54 page_unlock(pp); 55 } 56 return (PLAT_HOLD_FAIL); 57 } 58 if (lock == PLAT_HOLD_LOCK) 59 *pp_ret = pp; 60 #endif /* __xpv */ 61 62 return (PLAT_HOLD_OK); 63 } 64 65 /*ARGSUSED*/ 66 void 67 plat_release_page(page_t *pp) 68 { 69 #if defined(__xpv) 70 ASSERT((pp != NULL) && PAGE_LOCKED(pp)); 71 page_unlock(pp); 72 #endif 73 } 74