]>
Commit | Line | Data |
---|---|---|
506f57dd LZ |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: osunixmap - Unix OSL for file mappings | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
82a80941 | 8 | * Copyright (C) 2000 - 2015, Intel Corp. |
506f57dd LZ |
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 _free_BSD | |
48 | #include <sys/param.h> | |
49 | #endif | |
50 | ||
51 | #define _COMPONENT ACPI_OS_SERVICES | |
52 | ACPI_MODULE_NAME("osunixmap") | |
53 | ||
54 | #ifndef O_BINARY | |
55 | #define O_BINARY 0 | |
56 | #endif | |
57 | #ifdef _free_BSD | |
58 | #define MMAP_FLAGS MAP_SHARED | |
59 | #else | |
60 | #define MMAP_FLAGS MAP_PRIVATE | |
61 | #endif | |
62 | #define SYSTEM_MEMORY "/dev/mem" | |
63 | /******************************************************************************* | |
64 | * | |
65 | * FUNCTION: acpi_os_get_page_size | |
66 | * | |
67 | * PARAMETERS: None | |
68 | * | |
69 | * RETURN: Page size of the platform. | |
70 | * | |
71 | * DESCRIPTION: Obtain page size of the platform. | |
72 | * | |
73 | ******************************************************************************/ | |
74 | static acpi_size acpi_os_get_page_size(void) | |
75 | { | |
76 | ||
77 | #ifdef PAGE_SIZE | |
78 | return PAGE_SIZE; | |
79 | #else | |
80 | return sysconf(_SC_PAGESIZE); | |
81 | #endif | |
82 | } | |
83 | ||
84 | /****************************************************************************** | |
85 | * | |
86 | * FUNCTION: acpi_os_map_memory | |
87 | * | |
88 | * PARAMETERS: where - Physical address of memory to be mapped | |
89 | * length - How much memory to map | |
90 | * | |
91 | * RETURN: Pointer to mapped memory. Null on error. | |
92 | * | |
93 | * DESCRIPTION: Map physical memory into local address space. | |
94 | * | |
95 | *****************************************************************************/ | |
96 | ||
97 | void *acpi_os_map_memory(acpi_physical_address where, acpi_size length) | |
98 | { | |
99 | u8 *mapped_memory; | |
100 | acpi_physical_address offset; | |
101 | acpi_size page_size; | |
102 | int fd; | |
103 | ||
104 | fd = open(SYSTEM_MEMORY, O_RDONLY | O_BINARY); | |
105 | if (fd < 0) { | |
106 | fprintf(stderr, "Cannot open %s\n", SYSTEM_MEMORY); | |
107 | return (NULL); | |
108 | } | |
109 | ||
110 | /* Align the offset to use mmap */ | |
111 | ||
112 | page_size = acpi_os_get_page_size(); | |
113 | offset = where % page_size; | |
114 | ||
115 | /* Map the table header to get the length of the full table */ | |
116 | ||
117 | mapped_memory = mmap(NULL, (length + offset), PROT_READ, MMAP_FLAGS, | |
118 | fd, (where - offset)); | |
119 | if (mapped_memory == MAP_FAILED) { | |
120 | fprintf(stderr, "Cannot map %s\n", SYSTEM_MEMORY); | |
121 | close(fd); | |
122 | return (NULL); | |
123 | } | |
124 | ||
125 | close(fd); | |
126 | return (ACPI_CAST8(mapped_memory + offset)); | |
127 | } | |
128 | ||
129 | /****************************************************************************** | |
130 | * | |
131 | * FUNCTION: acpi_os_unmap_memory | |
132 | * | |
133 | * PARAMETERS: where - Logical address of memory to be unmapped | |
134 | * length - How much memory to unmap | |
135 | * | |
136 | * RETURN: None. | |
137 | * | |
138 | * DESCRIPTION: Delete a previously created mapping. Where and Length must | |
139 | * correspond to a previous mapping exactly. | |
140 | * | |
141 | *****************************************************************************/ | |
142 | ||
143 | void acpi_os_unmap_memory(void *where, acpi_size length) | |
144 | { | |
145 | acpi_physical_address offset; | |
146 | acpi_size page_size; | |
147 | ||
148 | page_size = acpi_os_get_page_size(); | |
149 | offset = (acpi_physical_address) where % page_size; | |
150 | munmap((u8 *)where - offset, (length + offset)); | |
151 | } |