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 * $FreeBSD$ 27 */ 28 29 /* 30 * ACPI Table interfaces 31 */ 32 33 #include <sys/param.h> 34 #include <sys/endian.h> 35 #include <sys/kernel.h> 36 #include <sys/linker.h> 37 38 #include "acpi.h" 39 #include <contrib/dev/acpica/actables.h> 40 41 #undef _COMPONENT 42 #define _COMPONENT ACPI_TABLES 43 44 static char acpi_osname[128]; 45 TUNABLE_STR("hw.acpi.osname", acpi_osname, sizeof(acpi_osname)); 46 47 static struct { 48 ACPI_TABLE_HEADER_DEF 49 uint32_t no_op; 50 } __packed fake_ssdt; 51 52 ACPI_STATUS 53 AcpiOsPredefinedOverride ( 54 const ACPI_PREDEFINED_NAMES *InitVal, 55 ACPI_STRING *NewVal) 56 { 57 if (InitVal == NULL || NewVal == NULL) 58 return (AE_BAD_PARAMETER); 59 60 *NewVal = NULL; 61 if (strncmp(InitVal->Name, "_OS_", 4) == 0 && strlen(acpi_osname) > 0) { 62 printf("ACPI: Overriding _OS definition with \"%s\"\n", acpi_osname); 63 *NewVal = acpi_osname; 64 } 65 66 return (AE_OK); 67 } 68 69 ACPI_STATUS 70 AcpiOsTableOverride ( 71 ACPI_TABLE_HEADER *ExistingTable, 72 ACPI_TABLE_HEADER **NewTable) 73 { 74 caddr_t acpi_dsdt, p; 75 76 if (ExistingTable == NULL || NewTable == NULL) 77 return (AE_BAD_PARAMETER); 78 79 /* If we're not overriding the DSDT, just return. */ 80 *NewTable = NULL; 81 if ((acpi_dsdt = preload_search_by_type("acpi_dsdt")) == NULL) 82 return (AE_OK); 83 if ((p = preload_search_info(acpi_dsdt, MODINFO_ADDR)) == NULL) 84 return (AE_OK); 85 86 /* 87 * Override the DSDT with the user's custom version. Override the 88 * contents of any SSDTs with a simple no-op table since the user's 89 * DSDT is expected to contain their contents as well. 90 */ 91 if (strncmp(ExistingTable->Signature, "DSDT", 4) == 0) { 92 printf("ACPI: overriding DSDT/SSDT with custom table\n"); 93 *NewTable = *(void **)p; 94 } else if (strncmp(ExistingTable->Signature, "SSDT", 4) == 0) { 95 if (fake_ssdt.Length == 0) { 96 sprintf(fake_ssdt.Signature, "%.4s", "SSDT"); 97 fake_ssdt.Length = htole32(sizeof(fake_ssdt)); 98 fake_ssdt.Revision = 2; 99 fake_ssdt.Checksum = 0; 100 sprintf(fake_ssdt.OemId, "%.6s", "FBSD "); 101 sprintf(fake_ssdt.OemTableId, "%.8s", "NullSSDT"); 102 fake_ssdt.OemRevision = htole32(1); 103 sprintf(fake_ssdt.AslCompilerId, "%.4s", "FBSD"); 104 fake_ssdt.AslCompilerRevision = htole32(1); 105 fake_ssdt.no_op = htole32(0x005c0310); /* Scope(\) */ 106 fake_ssdt.Checksum -= AcpiTbChecksum(&fake_ssdt, sizeof(fake_ssdt)); 107 } 108 *NewTable = (void *)&fake_ssdt; 109 } 110 111 return (AE_OK); 112 } 113