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 static struct { 49 ACPI_TABLE_HEADER_DEF 50 uint32_t no_op; 51 } __packed fake_ssdt; 52 53 ACPI_STATUS 54 AcpiOsPredefinedOverride ( 55 const ACPI_PREDEFINED_NAMES *InitVal, 56 ACPI_STRING *NewVal) 57 { 58 if (InitVal == NULL || NewVal == NULL) 59 return (AE_BAD_PARAMETER); 60 61 *NewVal = NULL; 62 if (strncmp(InitVal->Name, "_OS_", 4) == 0 && strlen(acpi_osname) > 0) { 63 printf("ACPI: Overriding _OS definition with \"%s\"\n", acpi_osname); 64 *NewVal = acpi_osname; 65 } 66 67 return (AE_OK); 68 } 69 70 ACPI_STATUS 71 AcpiOsTableOverride ( 72 ACPI_TABLE_HEADER *ExistingTable, 73 ACPI_TABLE_HEADER **NewTable) 74 { 75 caddr_t acpi_dsdt, p; 76 77 if (ExistingTable == NULL || NewTable == NULL) 78 return (AE_BAD_PARAMETER); 79 80 /* If we're not overriding the DSDT, just return. */ 81 *NewTable = NULL; 82 if ((acpi_dsdt = preload_search_by_type("acpi_dsdt")) == NULL) 83 return (AE_OK); 84 if ((p = preload_search_info(acpi_dsdt, MODINFO_ADDR)) == NULL) 85 return (AE_OK); 86 87 /* 88 * Override the DSDT with the user's custom version. Override the 89 * contents of any SSDTs with a simple no-op table since the user's 90 * DSDT is expected to contain their contents as well. 91 */ 92 if (strncmp(ExistingTable->Signature, "DSDT", 4) == 0) { 93 printf("ACPI: overriding DSDT/SSDT with custom table\n"); 94 *NewTable = *(void **)p; 95 } else if (strncmp(ExistingTable->Signature, "SSDT", 4) == 0) { 96 if (fake_ssdt.Length == 0) { 97 sprintf(fake_ssdt.Signature, "%.4s", "SSDT"); 98 fake_ssdt.Length = htole32(sizeof(fake_ssdt)); 99 fake_ssdt.Revision = 2; 100 fake_ssdt.Checksum = 0; 101 sprintf(fake_ssdt.OemId, "%.6s", "FBSD "); 102 sprintf(fake_ssdt.OemTableId, "%.8s", "NullSSDT"); 103 fake_ssdt.OemRevision = htole32(1); 104 sprintf(fake_ssdt.AslCompilerId, "%.4s", "FBSD"); 105 fake_ssdt.AslCompilerRevision = htole32(1); 106 fake_ssdt.no_op = htole32(0x005c0310); /* Scope(\) */ 107 fake_ssdt.Checksum -= AcpiTbGenerateChecksum(&fake_ssdt, 108 sizeof(fake_ssdt)); 109 } 110 *NewTable = (void *)&fake_ssdt; 111 } 112 113 return (AE_OK); 114 } 115