2 * Copyright (c) 2002 Mitsaru Iwasaki
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
28 * ACPI Table interfaces
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/endian.h>
36 #include <sys/kernel.h>
37 #include <sys/linker.h>
39 #include <contrib/dev/acpica/include/acpi.h>
40 #include <contrib/dev/acpica/include/actables.h>
43 #define _COMPONENT ACPI_TABLES
45 static char acpi_osname[128];
46 TUNABLE_STR("hw.acpi.osname", acpi_osname, sizeof(acpi_osname));
49 AcpiOsPredefinedOverride(const ACPI_PREDEFINED_NAMES *InitVal,
53 if (InitVal == NULL || NewVal == NULL)
54 return (AE_BAD_PARAMETER);
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;
67 AcpiOsTableOverride(ACPI_TABLE_HEADER *ExistingTable,
68 ACPI_TABLE_HEADER **NewTable)
70 char modname[] = "acpi_dsdt";
71 caddr_t acpi_table, p, s;
73 if (ExistingTable == NULL || NewTable == NULL)
74 return (AE_BAD_PARAMETER);
77 for (int i = 0; i < ACPI_NAME_SIZE; i++)
78 modname[i + 5] = tolower(ExistingTable->Signature[i]);
80 /* If we're not overriding the DSDT, just return. */
81 if (strncmp(ExistingTable->Signature, ACPI_SIG_DSDT, ACPI_NAME_SIZE) != 0) {
87 if ((acpi_table = preload_search_by_type(modname)) != NULL &&
88 (p = preload_search_info(acpi_table, MODINFO_ADDR)) != NULL &&
89 (s = preload_search_info(acpi_table, MODINFO_SIZE)) != NULL &&
91 *NewTable = *(ACPI_TABLE_HEADER **)p;