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1.1 root 1: /*
2: * Copyright (c) 1988 University of Utah.
3: * Copyright (c) 1990 The Regents of the University of California.
4: * All rights reserved.
5: *
6: * This code is derived from software contributed to Berkeley by
7: * the Systems Programming Group of the University of Utah Computer
8: * Science Department.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: *
38: * from: Utah $Hdr: mmap.h 1.4 89/08/14$
39: *
1.1.1.2 ! root 40: * from: @(#)mapmem.h 7.2 (Berkeley) 6/6/90
! 41: * mapmem.h,v 1.3 1993/05/20 16:22:37 cgd Exp
1.1 root 42: */
43:
1.1.1.2 ! root 44: #ifndef _SYS_MAPMEM_H_
! 45: #define _SYS_MAPMEM_H_
! 46:
1.1 root 47: /*
48: * Mapped memory descriptors.
49: *
50: * A process has one of these for every "mapped" memory region.
51: * Mapped memory is characterized by:
52: * - Corresponding physical memory is neither paged nor swapped.
53: * - User PTEs have both pg_v and pg_fod set.
54: * - Has no backing swap space unless mapped over existing data.
55: * - If mapped over existing data, original data is lost when
56: * segment is unmapped. (i.e. pages are reinitialized to ZFOD)
57: * Operations:
58: * (*mm_fork)(mp, ischild) struct mapmem *mp; int ischild;
59: * Called during fork in both parent and child. Parent
60: * call can be used for maintaining reference counts and
61: * should NEVER destroy the region. Child call should be
62: * used for unmapping regions not inherited across forks.
63: * (*mm_vfork)(mp, fup, tup) struct mapmem *mp; struct user *fup, *tup;
64: * Called twice during vfork (always in parent context)
65: * after exchanging resources (including u_mmap chains).
66: * `fup' is the donor and `tup' the recipient of the
67: * "parent" (full) context. Needed for maintaining
68: * reference counts or if the underlying object contains
69: * references to owning process. Routine should NEVER
70: * destroy the region.
71: * (*mm_exec)(mp) struct mapmem *mp;
72: * Called during exec before releasing old address space.
73: * Used for graceful cleanup of underlying object. Resources
74: * will be freed regardless of what this routine does.
75: * Need to add a post-exec call to re-establish mappings
76: * in the new address space for regions inherited across execs.
77: * (*mm_exit)(mp) struct mapmem *mp;
78: * Called during exit just before releasing address space.
79: * Used for graceful cleanup of underlying object. Resources
80: * will be freed regardless of what this routine does.
81: * The default semantics for a region with routine addresses of zero are
82: * that it is inherited across forks, stays with the "active" process during
83: * vforks, and is destroyed by execs and exit.
84: */
85:
86: struct mapmem {
87: struct mapmem *mm_next; /* next descriptor */
88: int mm_id; /* identifier (e.g. fd, shmid) */
89: caddr_t mm_uva; /* user VA at which region is mapped */
90: int mm_size; /* size of mapped region */
91: int mm_prot; /* attributes of region */
92: struct mapmemops { /* operations */
93: int (*mm_fork)();
94: int (*mm_vfork)();
95: int (*mm_exec)();
96: int (*mm_exit)();
97: } *mm_ops;
98: };
99:
100: #define MMNIL ((struct mapmem *)0)
101:
102: /* attributes */
103: #define MM_RW 0x00 /* region is read-write */
104: #define MM_RO 0x01 /* region is read-only */
105: #define MM_CI 0x02 /* caching is inhibited on region */
106: #define MM_NOCORE 0x04 /* cannot write region to core file;
107: e.g. mapped framebuffer hardware */
108:
109: #ifdef KERNEL
110: #define MMALLOC(mp) \
111: (mp) = (struct mapmem *)malloc((u_long)sizeof(struct mapmem), \
112: M_MAPMEM, M_WAITOK)
113:
114: #define MMFREE(mp) \
115: free((caddr_t)(mp), M_MAPMEM)
116: #endif
1.1.1.2 ! root 117:
! 118: #endif /* !_SYS_MAPMEM_H_ */
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