usr/src/uts/common/vm/seg_dev.h

   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  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  27 /*        All Rights Reserved   */
  28
  29 /*
  30  * University Copyright- Copyright (c) 1982, 1986, 1988
  31  * The Regents of the University of California
  32  * All Rights Reserved
  33  *
  34  * University Acknowledgment- Portions of this document are derived from
  35  * software developed by the University of California, Berkeley, and its
  36  * contributors.
  37  */
  38
  39 #ifndef _VM_SEG_DEV_H
  40 #define _VM_SEG_DEV_H
  41
  42 #ifdef  __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 struct proc;
  47
  48 /*
  49  * Structure whose pointer is passed to the segdev_create routine
  50  */
  51 struct segdev_crargs {
  52         offset_t        offset;         /* starting offset */
  53         int     (*mapfunc)(dev_t dev, off_t off, int prot); /* map function */
  54         dev_t   dev;            /* device number */
  55         uchar_t type;           /* type of sharing done */
  56         uchar_t prot;           /* protection */
  57         uchar_t maxprot;        /* maximum protection */
  58         uint_t  hat_attr;       /* hat attr */
  59         uint_t  hat_flags;      /* currently, hat_flags is used ONLY for */
  60                                 /* HAT_LOAD_NOCONSIST; in future, it can be */
  61                                 /* expanded to include any flags that are */
  62                                 /* not already part of hat_attr */
  63         void    *devmap_data;   /* devmap_handle private data */
  64 };
  65
  66 /*
  67  * (Semi) private data maintained by the seg_dev driver per segment mapping
  68  *
  69  * The segment lock is necessary to protect fields that are modified
  70  * when the "read" version of the address space lock is held.  This lock
  71  * is not needed when the segment operation has the "write" version of
  72  * the address space lock (it would be redundant).
  73  *
  74  * The following fields in segdev_data are read-only when the address
  75  * space is "read" locked, and don't require the segment lock:
  76  *
  77  *      vp
  78  *      offset
  79  *      mapfunc
  80  *      maxprot
  81  */
  82 struct  segdev_data {
  83         offset_t        offset;         /* device offset for start of mapping */
  84         krwlock_t       lock;           /* protects segdev_data */
  85         int     (*mapfunc)(dev_t dev, off_t off, int prot);
  86         struct  vnode *vp;      /* vnode associated with device */
  87         uchar_t pageprot;       /* true if per page protections present */
  88         uchar_t prot;           /* current segment prot if pageprot == 0 */
  89         uchar_t maxprot;        /* maximum segment protections */
  90         uchar_t type;           /* type of sharing done */
  91         struct  vpage *vpage;   /* per-page information, if needed */
  92         uint_t  hat_attr;       /* hat attr - pass to attr in hat_devload */
  93         uint_t  hat_flags;      /* set HAT_LOAD_NOCONSIST flag in hat_devload */
  94                                 /* see comments above in segdev_crargs */
  95         size_t  softlockcnt;    /* # of SOFTLOCKED in seg */
  96         void    *devmap_data;   /* devmap_handle private data */
  97 };
  98
  99 /* Direct physical-userland mapping, without occupying kernel address space */
 100 #define DEVMAP_PMEM_COOKIE      ((ddi_umem_cookie_t)0x2)
 101
 102 /*
 103  * pmem_cookie:
 104  * Records physical memory pages to be exported to userland.
 105  */
 106 struct devmap_pmem_cookie {
 107         pgcnt_t dp_npages;              /* number of allocated mem pages */
 108         page_t  **dp_pparray;           /* pages allocated for this cookie */
 109         vnode_t *dp_vnp;                /* vnode associated with this cookie */
 110         proc_t *dp_proc;                /* proc ptr for resource control */
 111 };
 112
 113 #ifdef _KERNEL
 114
 115 /*
 116  * Mappings of /dev/null come from segdev and have no mapping type.
 117  */
 118
 119 #define SEG_IS_DEVNULL_MAPPING(seg)     \
 120         ((seg)->s_ops == &segdev_ops && \
 121         ((SEGOP_GETTYPE(seg, (seg)->s_base) & (MAP_SHARED | MAP_PRIVATE)) == 0))
 122
 123 extern void segdev_init(void);
 124
 125 extern int segdev_create(struct seg *, void *);
 126
 127 extern int segdev_copyto(struct seg *, caddr_t, const void *, void *, size_t);
 128 extern int segdev_copyfrom(struct seg *, caddr_t, const void *, void *, size_t);
 129 extern struct seg_ops segdev_ops;
 130
 131 #endif  /* _KERNEL */
 132
 133 #ifdef  __cplusplus
 134 }
 135 #endif
 136
 137 #endif  /* _VM_SEG_DEV_H */