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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _VM_HMENT_H 28 #define _VM_HMENT_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 37 struct hment; 38 typedef struct hment hment_t; 39 40 #if defined(_KERNEL) 41 42 /* 43 * Remove a page mapping, finds the matching mapping and unlinks it from 44 * the page_t. If it returns a non-NULL pointer, the pointer must be 45 * freed via hment_free() after doing x86_hm_exit(). 46 */ 47 extern hment_t *hment_remove(page_t *, htable_t *ht, uint_t entry); 48 extern void hment_free(hment_t *); 49 50 /* 51 * Iterator to walk through all mappings of a page. 52 */ 53 extern hment_t *hment_walk(page_t *, htable_t **, uint_t *, hment_t *); 54 55 /* 56 * Prepare a page for a new mapping 57 */ 58 extern hment_t *hment_prepare(htable_t *ht, uint_t entry, page_t *); 59 60 /* 61 * Add a mapping to a page's mapping list 62 */ 63 extern void hment_assign(htable_t *ht, uint_t entry, page_t *, hment_t *); 64 65 /* 66 * initialize hment data structures 67 */ 68 extern void hment_init(void); 69 70 /* 71 * lock/unlock a page_t's mapping list/pte entry 72 */ 73 extern void x86_hm_enter(page_t *); 74 extern void x86_hm_exit(page_t *); 75 extern int x86_hm_held(page_t *pp); 76 77 /* 78 * Called to allocate additional hments for reserve. 79 * 80 * The hment_reserve_count is exported for use by htable_hment_steal() 81 */ 82 extern void hment_reserve(uint_t); 83 extern uint_t hment_reserve_count; 84 85 /* 86 * Used to readjust the hment reserve after the reserve list has been used. 87 * Also called after boot to release left over boot reserves. 88 */ 89 extern void hment_adjust_reserve(void); 90 91 /* 92 * Return the number of mappings of a page_t 93 */ 94 extern uint_t hment_mapcnt(page_t *); 95 96 #endif /* _KERNEL */ 97 98 99 #ifdef __cplusplus 100 } 101 #endif 102 103 #endif /* _VM_HMENT_H */ 104