Commit | Line | Data |
---|---|---|
13e82d02 FT |
1 | /* sfi_acpi.c Simple Firmware Interface - ACPI extensions */ |
2 | ||
3 | /* | |
4 | ||
5 | This file is provided under a dual BSD/GPLv2 license. When using or | |
6 | redistributing this file, you may do so under either license. | |
7 | ||
8 | GPL LICENSE SUMMARY | |
9 | ||
10 | Copyright(c) 2009 Intel Corporation. All rights reserved. | |
11 | ||
12 | This program is free software; you can redistribute it and/or modify | |
13 | it under the terms of version 2 of the GNU General Public License as | |
14 | published by the Free Software Foundation. | |
15 | ||
16 | This program is distributed in the hope that it will be useful, but | |
17 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU General Public License | |
22 | along with this program; if not, write to the Free Software | |
23 | Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
24 | The full GNU General Public License is included in this distribution | |
25 | in the file called LICENSE.GPL. | |
26 | ||
27 | BSD LICENSE | |
28 | ||
29 | Copyright(c) 2009 Intel Corporation. All rights reserved. | |
30 | ||
31 | Redistribution and use in source and binary forms, with or without | |
32 | modification, are permitted provided that the following conditions | |
33 | are met: | |
34 | ||
35 | * Redistributions of source code must retain the above copyright | |
36 | notice, this list of conditions and the following disclaimer. | |
37 | * Redistributions in binary form must reproduce the above copyright | |
38 | notice, this list of conditions and the following disclaimer in | |
39 | the documentation and/or other materials provided with the | |
40 | distribution. | |
41 | * Neither the name of Intel Corporation nor the names of its | |
42 | contributors may be used to endorse or promote products derived | |
43 | from this software without specific prior written permission. | |
44 | ||
45 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
46 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
47 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
48 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
49 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
50 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
51 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
52 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
53 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
54 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
55 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
56 | ||
57 | */ | |
58 | ||
59 | #define KMSG_COMPONENT "SFI" | |
60 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
61 | ||
62 | #include <linux/kernel.h> | |
c099eacb | 63 | #include <linux/sfi_acpi.h> |
13e82d02 FT |
64 | #include "sfi_core.h" |
65 | ||
66 | /* | |
67 | * SFI can access ACPI-defined tables via an optional ACPI XSDT. | |
68 | * | |
69 | * This allows re-use, and avoids re-definition, of standard tables. | |
70 | * For example, the "MCFG" table is defined by PCI, reserved by ACPI, | |
71 | * and is expected to be present many SFI-only systems. | |
72 | */ | |
73 | ||
74 | static struct acpi_table_xsdt *xsdt_va __read_mostly; | |
75 | ||
76 | #define XSDT_GET_NUM_ENTRIES(ptable, entry_type) \ | |
77 | ((ptable->header.length - sizeof(struct acpi_table_header)) / \ | |
78 | (sizeof(entry_type))) | |
79 | ||
80 | static inline struct sfi_table_header *acpi_to_sfi_th( | |
81 | struct acpi_table_header *th) | |
82 | { | |
83 | return (struct sfi_table_header *)th; | |
84 | } | |
85 | ||
86 | static inline struct acpi_table_header *sfi_to_acpi_th( | |
87 | struct sfi_table_header *th) | |
88 | { | |
89 | return (struct acpi_table_header *)th; | |
90 | } | |
91 | ||
92 | /* | |
93 | * sfi_acpi_parse_xsdt() | |
94 | * | |
95 | * Parse the ACPI XSDT for later access by sfi_acpi_table_parse(). | |
96 | */ | |
97 | static int __init sfi_acpi_parse_xsdt(struct sfi_table_header *th) | |
98 | { | |
99 | struct sfi_table_key key = SFI_ANY_KEY; | |
100 | int tbl_cnt, i; | |
101 | void *ret; | |
102 | ||
103 | xsdt_va = (struct acpi_table_xsdt *)th; | |
104 | tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64); | |
105 | for (i = 0; i < tbl_cnt; i++) { | |
106 | ret = sfi_check_table(xsdt_va->table_offset_entry[i], &key); | |
107 | if (IS_ERR(ret)) { | |
108 | disable_sfi(); | |
109 | return -1; | |
110 | } | |
111 | } | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | int __init sfi_acpi_init(void) | |
117 | { | |
118 | struct sfi_table_key xsdt_key = { .sig = SFI_SIG_XSDT }; | |
119 | ||
120 | sfi_table_parse(SFI_SIG_XSDT, NULL, NULL, sfi_acpi_parse_xsdt); | |
121 | ||
122 | /* Only call the get_table to keep the table mapped */ | |
123 | xsdt_va = (struct acpi_table_xsdt *)sfi_get_table(&xsdt_key); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static struct acpi_table_header *sfi_acpi_get_table(struct sfi_table_key *key) | |
128 | { | |
129 | u32 tbl_cnt, i; | |
130 | void *ret; | |
131 | ||
132 | tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64); | |
133 | for (i = 0; i < tbl_cnt; i++) { | |
134 | ret = sfi_check_table(xsdt_va->table_offset_entry[i], key); | |
135 | if (!IS_ERR(ret) && ret) | |
136 | return sfi_to_acpi_th(ret); | |
137 | } | |
138 | ||
139 | return NULL; | |
140 | } | |
141 | ||
142 | static void sfi_acpi_put_table(struct acpi_table_header *table) | |
143 | { | |
144 | sfi_put_table(acpi_to_sfi_th(table)); | |
145 | } | |
146 | ||
147 | /* | |
148 | * sfi_acpi_table_parse() | |
149 | * | |
150 | * Find specified table in XSDT, run handler on it and return its return value | |
151 | */ | |
152 | int sfi_acpi_table_parse(char *signature, char *oem_id, char *oem_table_id, | |
153 | int(*handler)(struct acpi_table_header *)) | |
154 | { | |
155 | struct acpi_table_header *table = NULL; | |
156 | struct sfi_table_key key; | |
157 | int ret = 0; | |
158 | ||
159 | if (sfi_disabled) | |
160 | return -1; | |
161 | ||
162 | key.sig = signature; | |
163 | key.oem_id = oem_id; | |
164 | key.oem_table_id = oem_table_id; | |
165 | ||
166 | table = sfi_acpi_get_table(&key); | |
167 | if (!table) | |
168 | return -EINVAL; | |
169 | ||
170 | ret = handler(table); | |
171 | sfi_acpi_put_table(table); | |
172 | return ret; | |
173 | } | |
dce80a56 FT |
174 | |
175 | static ssize_t sfi_acpi_table_show(struct file *filp, struct kobject *kobj, | |
176 | struct bin_attribute *bin_attr, char *buf, | |
177 | loff_t offset, size_t count) | |
178 | { | |
179 | struct sfi_table_attr *tbl_attr = | |
180 | container_of(bin_attr, struct sfi_table_attr, attr); | |
181 | struct acpi_table_header *th = NULL; | |
182 | struct sfi_table_key key; | |
183 | ssize_t cnt; | |
184 | ||
185 | key.sig = tbl_attr->name; | |
186 | key.oem_id = NULL; | |
187 | key.oem_table_id = NULL; | |
188 | ||
189 | th = sfi_acpi_get_table(&key); | |
190 | if (!th) | |
191 | return 0; | |
192 | ||
193 | cnt = memory_read_from_buffer(buf, count, &offset, | |
194 | th, th->length); | |
195 | sfi_acpi_put_table(th); | |
196 | ||
197 | return cnt; | |
198 | } | |
199 | ||
200 | ||
201 | void __init sfi_acpi_sysfs_init(void) | |
202 | { | |
203 | u32 tbl_cnt, i; | |
204 | struct sfi_table_attr *tbl_attr; | |
205 | ||
206 | tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64); | |
207 | for (i = 0; i < tbl_cnt; i++) { | |
208 | tbl_attr = | |
209 | sfi_sysfs_install_table(xsdt_va->table_offset_entry[i]); | |
210 | tbl_attr->attr.read = sfi_acpi_table_show; | |
211 | } | |
212 | ||
213 | return; | |
214 | } |