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1 /* sfi_acpi.c Simple Firmware Interface - ACPI extensions */
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.
10 Copyright(c) 2009 Intel Corporation. All rights reserved.
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.
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.
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.
29 Copyright(c) 2009 Intel Corporation. All rights reserved.
31 Redistribution and use in source and binary forms, with or without
32 modification, are permitted provided that the following conditions
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
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.
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.
59 #define KMSG_COMPONENT "SFI"
60 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
62 #include <linux/kernel.h>
63 #include <acpi/acpi.h>
65 #include <linux/sfi.h>
69 * SFI can access ACPI-defined tables via an optional ACPI XSDT.
71 * This allows re-use, and avoids re-definition, of standard tables.
72 * For example, the "MCFG" table is defined by PCI, reserved by ACPI,
73 * and is expected to be present many SFI-only systems.
76 static struct acpi_table_xsdt
*xsdt_va __read_mostly
;
78 #define XSDT_GET_NUM_ENTRIES(ptable, entry_type) \
79 ((ptable->header.length - sizeof(struct acpi_table_header)) / \
82 static inline struct sfi_table_header
*acpi_to_sfi_th(
83 struct acpi_table_header
*th
)
85 return (struct sfi_table_header
*)th
;
88 static inline struct acpi_table_header
*sfi_to_acpi_th(
89 struct sfi_table_header
*th
)
91 return (struct acpi_table_header
*)th
;
95 * sfi_acpi_parse_xsdt()
97 * Parse the ACPI XSDT for later access by sfi_acpi_table_parse().
99 static int __init
sfi_acpi_parse_xsdt(struct sfi_table_header
*th
)
101 struct sfi_table_key key
= SFI_ANY_KEY
;
105 xsdt_va
= (struct acpi_table_xsdt
*)th
;
106 tbl_cnt
= XSDT_GET_NUM_ENTRIES(xsdt_va
, u64
);
107 for (i
= 0; i
< tbl_cnt
; i
++) {
108 ret
= sfi_check_table(xsdt_va
->table_offset_entry
[i
], &key
);
118 int __init
sfi_acpi_init(void)
120 struct sfi_table_key xsdt_key
= { .sig
= SFI_SIG_XSDT
};
122 sfi_table_parse(SFI_SIG_XSDT
, NULL
, NULL
, sfi_acpi_parse_xsdt
);
124 /* Only call the get_table to keep the table mapped */
125 xsdt_va
= (struct acpi_table_xsdt
*)sfi_get_table(&xsdt_key
);
129 static struct acpi_table_header
*sfi_acpi_get_table(struct sfi_table_key
*key
)
134 tbl_cnt
= XSDT_GET_NUM_ENTRIES(xsdt_va
, u64
);
135 for (i
= 0; i
< tbl_cnt
; i
++) {
136 ret
= sfi_check_table(xsdt_va
->table_offset_entry
[i
], key
);
137 if (!IS_ERR(ret
) && ret
)
138 return sfi_to_acpi_th(ret
);
144 static void sfi_acpi_put_table(struct acpi_table_header
*table
)
146 sfi_put_table(acpi_to_sfi_th(table
));
150 * sfi_acpi_table_parse()
152 * Find specified table in XSDT, run handler on it and return its return value
154 int sfi_acpi_table_parse(char *signature
, char *oem_id
, char *oem_table_id
,
155 int(*handler
)(struct acpi_table_header
*))
157 struct acpi_table_header
*table
= NULL
;
158 struct sfi_table_key key
;
166 key
.oem_table_id
= oem_table_id
;
168 table
= sfi_acpi_get_table(&key
);
172 ret
= handler(table
);
173 sfi_acpi_put_table(table
);