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 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_COPYOPS_H 28 #define _SYS_COPYOPS_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <sys/types.h> 33 #include <sys/thread.h> 34 #include <sys/buf.h> 35 #include <sys/aio_req.h> 36 #include <sys/uio.h> 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 #ifdef _KERNEL 43 44 /* 45 * Copy in/out vector operations. This structure is used to interpose 46 * on the kernel copyin/copyout/etc. operations for various purposes 47 * such as handling watchpoints in the affected user memory. When one of the 48 * copy operations causes a fault, the corresponding function in this vector is 49 * called to handle it. 50 * 51 * The 64-bit operations in the structure fetch and store extended 52 * words and are only used on platforms with 64 bit general 53 * registers e.g. sun4u. 54 * 55 * Since the only users of these interfaces (watchpoints and pxfs) perform the 56 * default action unless there is a page fault, we can save the overhead of 57 * having to go through this indirection unless there is a page fault. This 58 * improves performance both in general and when watchpoints are enabled. If, 59 * in the future, a consumer relies on being able to interpose on all actions, 60 * then this assumption will have to be undone. 61 * 62 * No consumers should call these functions directly. They are automatically 63 * handled by the generic versions. 64 */ 65 typedef struct copyops { 66 /* 67 * unstructured byte copyin/out functions 68 */ 69 int (*cp_copyin)(const void *, void *, size_t); 70 int (*cp_xcopyin)(const void *, void *, size_t); 71 int (*cp_copyout)(const void *, void *, size_t); 72 int (*cp_xcopyout)(const void *, void *, size_t); 73 int (*cp_copyinstr)(const char *, char *, size_t, size_t *); 74 int (*cp_copyoutstr)(const char *, char *, size_t, size_t *); 75 76 /* 77 * fetch/store byte/halfword/word/extended word 78 */ 79 int (*cp_fuword8)(const void *, uint8_t *); 80 int (*cp_fuword16)(const void *, uint16_t *); 81 int (*cp_fuword32)(const void *, uint32_t *); 82 int (*cp_fuword64)(const void *, uint64_t *); 83 84 int (*cp_suword8)(void *, uint8_t); 85 int (*cp_suword16)(void *, uint16_t); 86 int (*cp_suword32)(void *, uint32_t); 87 int (*cp_suword64)(void *, uint64_t); 88 89 int (*cp_physio)(int (*)(struct buf *), struct buf *, dev_t, 90 int, void (*)(struct buf *), struct uio *); 91 } copyops_t; 92 93 extern int default_physio(int (*)(struct buf *), struct buf *, 94 dev_t, int, void (*)(struct buf *), struct uio *); 95 96 /* 97 * Interfaces for installing and removing copyops. 98 */ 99 extern void install_copyops(kthread_id_t tp, copyops_t *cp); 100 extern void remove_copyops(kthread_id_t tp); 101 extern int copyops_installed(kthread_id_t tp); 102 103 #endif /* _KERNEL */ 104 105 #ifdef __cplusplus 106 } 107 #endif 108 109 #endif /* _SYS_COPYOPS_H */ 110