xref: /freebsd/sys/dev/acpica/Osd/OsdTable.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*-
2  * Copyright (c) 2002 Mitsaru Iwasaki
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 /*
28  * ACPI Table interfaces
29  */
30 
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33 
34 #include <sys/param.h>
35 #include <sys/endian.h>
36 #include <sys/kernel.h>
37 #include <sys/linker.h>
38 
39 #include <contrib/dev/acpica/acpi.h>
40 #include <contrib/dev/acpica/actables.h>
41 
42 #undef _COMPONENT
43 #define	_COMPONENT      ACPI_TABLES
44 
45 static char acpi_osname[128];
46 TUNABLE_STR("hw.acpi.osname", acpi_osname, sizeof(acpi_osname));
47 
48 ACPI_STATUS
49 AcpiOsPredefinedOverride(const ACPI_PREDEFINED_NAMES *InitVal,
50     ACPI_STRING *NewVal)
51 {
52 
53     if (InitVal == NULL || NewVal == NULL)
54 	return (AE_BAD_PARAMETER);
55 
56     *NewVal = NULL;
57     if (strncmp(InitVal->Name, "_OS_", ACPI_NAME_SIZE) == 0 &&
58 	strlen(acpi_osname) > 0) {
59 	printf("ACPI: Overriding _OS definition with \"%s\"\n", acpi_osname);
60 	*NewVal = acpi_osname;
61     }
62 
63     return (AE_OK);
64 }
65 
66 ACPI_STATUS
67 AcpiOsTableOverride(ACPI_TABLE_HEADER *ExistingTable,
68     ACPI_TABLE_HEADER **NewTable)
69 {
70     caddr_t acpi_dsdt, p;
71 
72     if (ExistingTable == NULL || NewTable == NULL)
73 	return (AE_BAD_PARAMETER);
74 
75     /* If we're not overriding the DSDT, just return. */
76     if ((acpi_dsdt = preload_search_by_type("acpi_dsdt")) == NULL ||
77 	(p = preload_search_info(acpi_dsdt, MODINFO_ADDR)) == NULL) {
78 	*NewTable = NULL;
79     } else
80 	*NewTable = *(ACPI_TABLE_HEADER **)p;
81 
82     return (AE_OK);
83 }
84