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Vector Packet Processing
vm_unix.h
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /*
16  Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus
17 
18  Permission is hereby granted, free of charge, to any person obtaining
19  a copy of this software and associated documentation files (the
20  "Software"), to deal in the Software without restriction, including
21  without limitation the rights to use, copy, modify, merge, publish,
22  distribute, sublicense, and/or sell copies of the Software, and to
23  permit persons to whom the Software is furnished to do so, subject to
24  the following conditions:
25 
26  The above copyright notice and this permission notice shall be
27  included in all copies or substantial portions of the Software.
28 
29  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
33  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
34  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
35  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 */
37 
38 #ifndef included_vm_unix_h
39 #define included_vm_unix_h
40 
41 #include <unistd.h>
42 #include <sys/mman.h>
43 
44 /* Allocate virtual address space. */
45 always_inline void *
47 {
48  void *mmap_addr;
49  uword flags = MAP_PRIVATE;
50 
51 #ifdef MAP_ANONYMOUS
52  flags |= MAP_ANONYMOUS;
53 #endif
54 
55  mmap_addr = mmap (0, size, PROT_READ | PROT_WRITE, flags, -1, 0);
56  if (mmap_addr == (void *) -1)
57  mmap_addr = 0;
58 
59  return mmap_addr;
60 }
61 
62 always_inline void
64 {
65  munmap (addr, size);
66 }
67 
68 always_inline void *
70 {
71  void *mmap_addr;
72  uword flags = MAP_PRIVATE | MAP_FIXED;
73 
74  /* To unmap we "map" with no protection. If we actually called
75  munmap then other callers could steal the address space. By
76  changing to PROT_NONE the kernel can free up the pages which is
77  really what we want "unmap" to mean. */
78  mmap_addr = mmap (addr, size, PROT_NONE, flags, -1, 0);
79  if (mmap_addr == (void *) -1)
80  mmap_addr = 0;
81 
82  return mmap_addr;
83 }
84 
85 always_inline void *
87 {
88  void *mmap_addr;
89  uword flags = MAP_PRIVATE | MAP_FIXED;
90 
91  mmap_addr = mmap (addr, size, (PROT_READ | PROT_WRITE), flags, -1, 0);
92  if (mmap_addr == (void *) -1)
93  mmap_addr = 0;
94 
95  return mmap_addr;
96 }
97 
98 #endif /* included_vm_unix_h */
99 
100 /*
101  * fd.io coding-style-patch-verification: ON
102  *
103  * Local Variables:
104  * eval: (c-set-style "gnu")
105  * End:
106  */
static void * clib_mem_vm_unmap(void *addr, uword size)
Definition: vm_unix.h:69
static void * clib_mem_vm_map(void *addr, uword size)
Definition: vm_unix.h:86
static void * clib_mem_vm_alloc(uword size)
Definition: vm_unix.h:46
#define always_inline
Definition: clib.h:84
u64 size
Definition: vhost-user.h:77
u64 uword
Definition: types.h:112
vhost_vring_addr_t addr
Definition: vhost-user.h:84
u32 flags
Definition: vhost-user.h:78
static void clib_mem_vm_free(void *addr, uword size)
Definition: vm_unix.h:63