tbxfroot.c revision 1.3.2.2
1 1.3.2.2 bouyer /****************************************************************************** 2 1.3.2.2 bouyer * 3 1.3.2.2 bouyer * Module Name: tbxfroot - Find the root ACPI table (RSDT) 4 1.3.2.2 bouyer * 5 1.3.2.2 bouyer *****************************************************************************/ 6 1.3.2.2 bouyer 7 1.3.2.2 bouyer /* 8 1.3.2.2 bouyer * Copyright (C) 2000 - 2011, Intel Corp. 9 1.3.2.2 bouyer * All rights reserved. 10 1.3.2.2 bouyer * 11 1.3.2.2 bouyer * Redistribution and use in source and binary forms, with or without 12 1.3.2.2 bouyer * modification, are permitted provided that the following conditions 13 1.3.2.2 bouyer * are met: 14 1.3.2.2 bouyer * 1. Redistributions of source code must retain the above copyright 15 1.3.2.2 bouyer * notice, this list of conditions, and the following disclaimer, 16 1.3.2.2 bouyer * without modification. 17 1.3.2.2 bouyer * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 1.3.2.2 bouyer * substantially similar to the "NO WARRANTY" disclaimer below 19 1.3.2.2 bouyer * ("Disclaimer") and any redistribution must be conditioned upon 20 1.3.2.2 bouyer * including a substantially similar Disclaimer requirement for further 21 1.3.2.2 bouyer * binary redistribution. 22 1.3.2.2 bouyer * 3. Neither the names of the above-listed copyright holders nor the names 23 1.3.2.2 bouyer * of any contributors may be used to endorse or promote products derived 24 1.3.2.2 bouyer * from this software without specific prior written permission. 25 1.3.2.2 bouyer * 26 1.3.2.2 bouyer * Alternatively, this software may be distributed under the terms of the 27 1.3.2.2 bouyer * GNU General Public License ("GPL") version 2 as published by the Free 28 1.3.2.2 bouyer * Software Foundation. 29 1.3.2.2 bouyer * 30 1.3.2.2 bouyer * NO WARRANTY 31 1.3.2.2 bouyer * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 1.3.2.2 bouyer * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 1.3.2.2 bouyer * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 1.3.2.2 bouyer * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 1.3.2.2 bouyer * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 1.3.2.2 bouyer * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 1.3.2.2 bouyer * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 1.3.2.2 bouyer * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 1.3.2.2 bouyer * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 1.3.2.2 bouyer * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 1.3.2.2 bouyer * POSSIBILITY OF SUCH DAMAGES. 42 1.3.2.2 bouyer */ 43 1.3.2.2 bouyer 44 1.3.2.2 bouyer #define __TBXFROOT_C__ 45 1.3.2.2 bouyer 46 1.3.2.2 bouyer #include "acpi.h" 47 1.3.2.2 bouyer #include "accommon.h" 48 1.3.2.2 bouyer #include "actables.h" 49 1.3.2.2 bouyer 50 1.3.2.2 bouyer 51 1.3.2.2 bouyer #define _COMPONENT ACPI_TABLES 52 1.3.2.2 bouyer ACPI_MODULE_NAME ("tbxfroot") 53 1.3.2.2 bouyer 54 1.3.2.2 bouyer /* Local prototypes */ 55 1.3.2.2 bouyer 56 1.3.2.2 bouyer static UINT8 * 57 1.3.2.2 bouyer AcpiTbScanMemoryForRsdp ( 58 1.3.2.2 bouyer UINT8 *StartAddress, 59 1.3.2.2 bouyer UINT32 Length); 60 1.3.2.2 bouyer 61 1.3.2.2 bouyer static ACPI_STATUS 62 1.3.2.2 bouyer AcpiTbValidateRsdp ( 63 1.3.2.2 bouyer ACPI_TABLE_RSDP *Rsdp); 64 1.3.2.2 bouyer 65 1.3.2.2 bouyer 66 1.3.2.2 bouyer /******************************************************************************* 67 1.3.2.2 bouyer * 68 1.3.2.2 bouyer * FUNCTION: AcpiTbValidateRsdp 69 1.3.2.2 bouyer * 70 1.3.2.2 bouyer * PARAMETERS: Rsdp - Pointer to unvalidated RSDP 71 1.3.2.2 bouyer * 72 1.3.2.2 bouyer * RETURN: Status 73 1.3.2.2 bouyer * 74 1.3.2.2 bouyer * DESCRIPTION: Validate the RSDP (ptr) 75 1.3.2.2 bouyer * 76 1.3.2.2 bouyer ******************************************************************************/ 77 1.3.2.2 bouyer 78 1.3.2.2 bouyer static ACPI_STATUS 79 1.3.2.2 bouyer AcpiTbValidateRsdp ( 80 1.3.2.2 bouyer ACPI_TABLE_RSDP *Rsdp) 81 1.3.2.2 bouyer { 82 1.3.2.2 bouyer ACPI_FUNCTION_ENTRY (); 83 1.3.2.2 bouyer 84 1.3.2.2 bouyer 85 1.3.2.2 bouyer /* 86 1.3.2.2 bouyer * The signature and checksum must both be correct 87 1.3.2.2 bouyer * 88 1.3.2.2 bouyer * Note: Sometimes there exists more than one RSDP in memory; the valid 89 1.3.2.2 bouyer * RSDP has a valid checksum, all others have an invalid checksum. 90 1.3.2.2 bouyer */ 91 1.3.2.2 bouyer if (ACPI_STRNCMP ((char *) Rsdp, ACPI_SIG_RSDP, 92 1.3.2.2 bouyer sizeof (ACPI_SIG_RSDP)-1) != 0) 93 1.3.2.2 bouyer { 94 1.3.2.2 bouyer /* Nope, BAD Signature */ 95 1.3.2.2 bouyer 96 1.3.2.2 bouyer return (AE_BAD_SIGNATURE); 97 1.3.2.2 bouyer } 98 1.3.2.2 bouyer 99 1.3.2.2 bouyer /* Check the standard checksum */ 100 1.3.2.2 bouyer 101 1.3.2.2 bouyer if (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) 102 1.3.2.2 bouyer { 103 1.3.2.2 bouyer return (AE_BAD_CHECKSUM); 104 1.3.2.2 bouyer } 105 1.3.2.2 bouyer 106 1.3.2.2 bouyer /* Check extended checksum if table version >= 2 */ 107 1.3.2.2 bouyer 108 1.3.2.2 bouyer if ((Rsdp->Revision >= 2) && 109 1.3.2.2 bouyer (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) 110 1.3.2.2 bouyer { 111 1.3.2.2 bouyer return (AE_BAD_CHECKSUM); 112 1.3.2.2 bouyer } 113 1.3.2.2 bouyer 114 1.3.2.2 bouyer return (AE_OK); 115 1.3.2.2 bouyer } 116 1.3.2.2 bouyer 117 1.3.2.2 bouyer 118 1.3.2.2 bouyer /******************************************************************************* 119 1.3.2.2 bouyer * 120 1.3.2.2 bouyer * FUNCTION: AcpiFindRootPointer 121 1.3.2.2 bouyer * 122 1.3.2.2 bouyer * PARAMETERS: TableAddress - Where the table pointer is returned 123 1.3.2.2 bouyer * 124 1.3.2.2 bouyer * RETURN: Status, RSDP physical address 125 1.3.2.2 bouyer * 126 1.3.2.2 bouyer * DESCRIPTION: Search lower 1Mbyte of memory for the root system descriptor 127 1.3.2.2 bouyer * pointer structure. If it is found, set *RSDP to point to it. 128 1.3.2.2 bouyer * 129 1.3.2.2 bouyer * NOTE1: The RSDP must be either in the first 1K of the Extended 130 1.3.2.2 bouyer * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.) 131 1.3.2.2 bouyer * Only a 32-bit physical address is necessary. 132 1.3.2.2 bouyer * 133 1.3.2.2 bouyer * NOTE2: This function is always available, regardless of the 134 1.3.2.2 bouyer * initialization state of the rest of ACPI. 135 1.3.2.2 bouyer * 136 1.3.2.2 bouyer ******************************************************************************/ 137 1.3.2.2 bouyer 138 1.3.2.2 bouyer ACPI_STATUS 139 1.3.2.2 bouyer AcpiFindRootPointer ( 140 1.3.2.2 bouyer ACPI_SIZE *TableAddress) 141 1.3.2.2 bouyer { 142 1.3.2.2 bouyer UINT8 *TablePtr; 143 1.3.2.2 bouyer UINT8 *MemRover; 144 1.3.2.2 bouyer UINT32 PhysicalAddress; 145 1.3.2.2 bouyer 146 1.3.2.2 bouyer 147 1.3.2.2 bouyer ACPI_FUNCTION_TRACE (AcpiFindRootPointer); 148 1.3.2.2 bouyer 149 1.3.2.2 bouyer 150 1.3.2.2 bouyer /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */ 151 1.3.2.2 bouyer 152 1.3.2.2 bouyer TablePtr = AcpiOsMapMemory ( 153 1.3.2.2 bouyer (ACPI_PHYSICAL_ADDRESS) ACPI_EBDA_PTR_LOCATION, 154 1.3.2.2 bouyer ACPI_EBDA_PTR_LENGTH); 155 1.3.2.2 bouyer if (!TablePtr) 156 1.3.2.2 bouyer { 157 1.3.2.2 bouyer ACPI_ERROR ((AE_INFO, 158 1.3.2.2 bouyer "Could not map memory at 0x%8.8X for length %u", 159 1.3.2.2 bouyer ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH)); 160 1.3.2.2 bouyer 161 1.3.2.2 bouyer return_ACPI_STATUS (AE_NO_MEMORY); 162 1.3.2.2 bouyer } 163 1.3.2.2 bouyer 164 1.3.2.2 bouyer ACPI_MOVE_16_TO_32 (&PhysicalAddress, TablePtr); 165 1.3.2.2 bouyer 166 1.3.2.2 bouyer /* Convert segment part to physical address */ 167 1.3.2.2 bouyer 168 1.3.2.2 bouyer PhysicalAddress <<= 4; 169 1.3.2.2 bouyer AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_PTR_LENGTH); 170 1.3.2.2 bouyer 171 1.3.2.2 bouyer /* EBDA present? */ 172 1.3.2.2 bouyer 173 1.3.2.2 bouyer if (PhysicalAddress > 0x400) 174 1.3.2.2 bouyer { 175 1.3.2.2 bouyer /* 176 1.3.2.2 bouyer * 1b) Search EBDA paragraphs (EBDA is required to be a 177 1.3.2.2 bouyer * minimum of 1K length) 178 1.3.2.2 bouyer */ 179 1.3.2.2 bouyer TablePtr = AcpiOsMapMemory ( 180 1.3.2.2 bouyer (ACPI_PHYSICAL_ADDRESS) PhysicalAddress, 181 1.3.2.2 bouyer ACPI_EBDA_WINDOW_SIZE); 182 1.3.2.2 bouyer if (!TablePtr) 183 1.3.2.2 bouyer { 184 1.3.2.2 bouyer ACPI_ERROR ((AE_INFO, 185 1.3.2.2 bouyer "Could not map memory at 0x%8.8X for length %u", 186 1.3.2.2 bouyer PhysicalAddress, ACPI_EBDA_WINDOW_SIZE)); 187 1.3.2.2 bouyer 188 1.3.2.2 bouyer return_ACPI_STATUS (AE_NO_MEMORY); 189 1.3.2.2 bouyer } 190 1.3.2.2 bouyer 191 1.3.2.2 bouyer MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_EBDA_WINDOW_SIZE); 192 1.3.2.2 bouyer AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_WINDOW_SIZE); 193 1.3.2.2 bouyer 194 1.3.2.2 bouyer if (MemRover) 195 1.3.2.2 bouyer { 196 1.3.2.2 bouyer /* Return the physical address */ 197 1.3.2.2 bouyer 198 1.3.2.2 bouyer PhysicalAddress += (UINT32) ACPI_PTR_DIFF (MemRover, TablePtr); 199 1.3.2.2 bouyer 200 1.3.2.2 bouyer *TableAddress = PhysicalAddress; 201 1.3.2.2 bouyer return_ACPI_STATUS (AE_OK); 202 1.3.2.2 bouyer } 203 1.3.2.2 bouyer } 204 1.3.2.2 bouyer 205 1.3.2.2 bouyer /* 206 1.3.2.2 bouyer * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh 207 1.3.2.2 bouyer */ 208 1.3.2.2 bouyer TablePtr = AcpiOsMapMemory ( 209 1.3.2.2 bouyer (ACPI_PHYSICAL_ADDRESS) ACPI_HI_RSDP_WINDOW_BASE, 210 1.3.2.2 bouyer ACPI_HI_RSDP_WINDOW_SIZE); 211 1.3.2.2 bouyer 212 1.3.2.2 bouyer if (!TablePtr) 213 1.3.2.2 bouyer { 214 1.3.2.2 bouyer ACPI_ERROR ((AE_INFO, 215 1.3.2.2 bouyer "Could not map memory at 0x%8.8X for length %u", 216 1.3.2.2 bouyer ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE)); 217 1.3.2.2 bouyer 218 1.3.2.2 bouyer return_ACPI_STATUS (AE_NO_MEMORY); 219 1.3.2.2 bouyer } 220 1.3.2.2 bouyer 221 1.3.2.2 bouyer MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE); 222 1.3.2.2 bouyer AcpiOsUnmapMemory (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE); 223 1.3.2.2 bouyer 224 1.3.2.2 bouyer if (MemRover) 225 1.3.2.2 bouyer { 226 1.3.2.2 bouyer /* Return the physical address */ 227 1.3.2.2 bouyer 228 1.3.2.2 bouyer PhysicalAddress = (UINT32) 229 1.3.2.2 bouyer (ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (MemRover, TablePtr)); 230 1.3.2.2 bouyer 231 1.3.2.2 bouyer *TableAddress = PhysicalAddress; 232 1.3.2.2 bouyer return_ACPI_STATUS (AE_OK); 233 1.3.2.2 bouyer } 234 1.3.2.2 bouyer 235 1.3.2.2 bouyer /* A valid RSDP was not found */ 236 1.3.2.2 bouyer 237 1.3.2.2 bouyer ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "A valid RSDP was not found")); 238 1.3.2.2 bouyer return_ACPI_STATUS (AE_NOT_FOUND); 239 1.3.2.2 bouyer } 240 1.3.2.2 bouyer 241 1.3.2.2 bouyer ACPI_EXPORT_SYMBOL (AcpiFindRootPointer) 242 1.3.2.2 bouyer 243 1.3.2.2 bouyer 244 1.3.2.2 bouyer /******************************************************************************* 245 1.3.2.2 bouyer * 246 1.3.2.2 bouyer * FUNCTION: AcpiTbScanMemoryForRsdp 247 1.3.2.2 bouyer * 248 1.3.2.2 bouyer * PARAMETERS: StartAddress - Starting pointer for search 249 1.3.2.2 bouyer * Length - Maximum length to search 250 1.3.2.2 bouyer * 251 1.3.2.2 bouyer * RETURN: Pointer to the RSDP if found, otherwise NULL. 252 1.3.2.2 bouyer * 253 1.3.2.2 bouyer * DESCRIPTION: Search a block of memory for the RSDP signature 254 1.3.2.2 bouyer * 255 1.3.2.2 bouyer ******************************************************************************/ 256 1.3.2.2 bouyer 257 1.3.2.2 bouyer static UINT8 * 258 1.3.2.2 bouyer AcpiTbScanMemoryForRsdp ( 259 1.3.2.2 bouyer UINT8 *StartAddress, 260 1.3.2.2 bouyer UINT32 Length) 261 1.3.2.2 bouyer { 262 1.3.2.2 bouyer ACPI_STATUS Status; 263 1.3.2.2 bouyer UINT8 *MemRover; 264 1.3.2.2 bouyer UINT8 *EndAddress; 265 1.3.2.2 bouyer 266 1.3.2.2 bouyer 267 1.3.2.2 bouyer ACPI_FUNCTION_TRACE (TbScanMemoryForRsdp); 268 1.3.2.2 bouyer 269 1.3.2.2 bouyer 270 1.3.2.2 bouyer EndAddress = StartAddress + Length; 271 1.3.2.2 bouyer 272 1.3.2.2 bouyer /* Search from given start address for the requested length */ 273 1.3.2.2 bouyer 274 1.3.2.2 bouyer for (MemRover = StartAddress; MemRover < EndAddress; 275 1.3.2.2 bouyer MemRover += ACPI_RSDP_SCAN_STEP) 276 1.3.2.2 bouyer { 277 1.3.2.2 bouyer /* The RSDP signature and checksum must both be correct */ 278 1.3.2.2 bouyer 279 1.3.2.2 bouyer Status = AcpiTbValidateRsdp (ACPI_CAST_PTR (ACPI_TABLE_RSDP, MemRover)); 280 1.3.2.2 bouyer if (ACPI_SUCCESS (Status)) 281 1.3.2.2 bouyer { 282 1.3.2.2 bouyer /* Sig and checksum valid, we have found a real RSDP */ 283 1.3.2.2 bouyer 284 1.3.2.2 bouyer ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 285 1.3.2.2 bouyer "RSDP located at physical address %p\n", MemRover)); 286 1.3.2.2 bouyer return_PTR (MemRover); 287 1.3.2.2 bouyer } 288 1.3.2.2 bouyer 289 1.3.2.2 bouyer /* No sig match or bad checksum, keep searching */ 290 1.3.2.2 bouyer } 291 1.3.2.2 bouyer 292 1.3.2.2 bouyer /* Searched entire block, no RSDP was found */ 293 1.3.2.2 bouyer 294 1.3.2.2 bouyer ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 295 1.3.2.2 bouyer "Searched entire block from %p, valid RSDP was not found\n", 296 1.3.2.2 bouyer StartAddress)); 297 1.3.2.2 bouyer return_PTR (NULL); 298 1.3.2.2 bouyer } 299 1.3.2.2 bouyer 300
Indexes created Wed Oct 15 14:09:57 GMT 2025