1 /******************************************************************************
2 *
3 * Module Name: osunixmap - Unix OSL for file mappings
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include "acpidump.h"
45 #include <unistd.h>
46 #include <sys/mman.h>
47 #ifdef _FreeBSD
48 #include <sys/param.h>
49 #endif
50
51 #define _COMPONENT ACPI_OS_SERVICES
52 ACPI_MODULE_NAME ("osunixmap")
53
54
55 #ifndef O_BINARY
56 #define O_BINARY 0
57 #endif
58
59 #ifdef _FreeBSD
60 #define MMAP_FLAGS MAP_SHARED
61 #else
62 #define MMAP_FLAGS MAP_PRIVATE
63 #endif
64
65 #define SYSTEM_MEMORY "/dev/mem"
66
67
68 /*******************************************************************************
69 *
70 * FUNCTION: AcpiOsGetPageSize
71 *
72 * PARAMETERS: None
73 *
74 * RETURN: Page size of the platform.
75 *
76 * DESCRIPTION: Obtain page size of the platform.
77 *
78 ******************************************************************************/
79
80 static ACPI_SIZE
81 AcpiOsGetPageSize (
82 void)
83 {
84
85 #ifdef PAGE_SIZE
86 return PAGE_SIZE;
87 #else
88 return sysconf (_SC_PAGESIZE);
89 #endif
90 }
91
92
93 /******************************************************************************
94 *
95 * FUNCTION: AcpiOsMapMemory
96 *
97 * PARAMETERS: Where - Physical address of memory to be mapped
98 * Length - How much memory to map
99 *
100 * RETURN: Pointer to mapped memory. Null on error.
101 *
102 * DESCRIPTION: Map physical memory into local address space.
103 *
104 *****************************************************************************/
105
106 void *
107 AcpiOsMapMemory (
108 ACPI_PHYSICAL_ADDRESS Where,
109 ACPI_SIZE Length)
110 {
111 UINT8 *MappedMemory;
112 ACPI_PHYSICAL_ADDRESS Offset;
113 ACPI_SIZE PageSize;
114 int fd;
115
116
117 fd = open (SYSTEM_MEMORY, O_RDONLY | O_BINARY);
118 if (fd < 0)
119 {
120 fprintf (stderr, "Cannot open %s\n", SYSTEM_MEMORY);
121 return (NULL);
122 }
123
124 /* Align the offset to use mmap */
125
126 PageSize = AcpiOsGetPageSize ();
127 Offset = Where % PageSize;
128
129 /* Map the table header to get the length of the full table */
130
131 MappedMemory = mmap (NULL, (Length + Offset), PROT_READ, MMAP_FLAGS,
132 fd, (Where - Offset));
133 if (MappedMemory == MAP_FAILED)
134 {
135 fprintf (stderr, "Cannot map %s\n", SYSTEM_MEMORY);
136 close (fd);
137 return (NULL);
138 }
139
140 close (fd);
141 return (ACPI_CAST8 (MappedMemory + Offset));
142 }
143
144
145 /******************************************************************************
146 *
147 * FUNCTION: AcpiOsUnmapMemory
148 *
149 * PARAMETERS: Where - Logical address of memory to be unmapped
150 * Length - How much memory to unmap
151 *
152 * RETURN: None.
153 *
154 * DESCRIPTION: Delete a previously created mapping. Where and Length must
155 * correspond to a previous mapping exactly.
156 *
157 *****************************************************************************/
158
159 void
160 AcpiOsUnmapMemory (
161 void *Where,
162 ACPI_SIZE Length)
163 {
164 ACPI_PHYSICAL_ADDRESS Offset;
165 ACPI_SIZE PageSize;
166
167
168 PageSize = AcpiOsGetPageSize ();
169 Offset = (ACPI_PHYSICAL_ADDRESS) Where % PageSize;
170 munmap ((UINT8 *) Where - Offset, (Length + Offset));
171 }