1 /******************************************************************************
3 * Module Name: tbrsdt - ACPI RSDT table utilities
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2005, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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41 * POSSIBILITY OF SUCH DAMAGES.
45 #include <acpi/acpi.h>
46 #include <acpi/actables.h>
49 #define _COMPONENT ACPI_TABLES
50 ACPI_MODULE_NAME ("tbrsdt")
53 /*******************************************************************************
55 * FUNCTION: acpi_tb_verify_rsdp
57 * PARAMETERS: Address - RSDP (Pointer to RSDT)
61 * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
63 ******************************************************************************/
67 struct acpi_pointer *address)
69 struct acpi_table_desc table_info;
71 struct rsdp_descriptor *rsdp;
74 ACPI_FUNCTION_TRACE ("tb_verify_rsdp");
77 switch (address->pointer_type) {
78 case ACPI_LOGICAL_POINTER:
80 rsdp = address->pointer.logical;
83 case ACPI_PHYSICAL_POINTER:
85 * Obtain access to the RSDP structure
87 status = acpi_os_map_memory (address->pointer.physical,
88 sizeof (struct rsdp_descriptor),
90 if (ACPI_FAILURE (status)) {
91 return_ACPI_STATUS (status);
96 return_ACPI_STATUS (AE_BAD_PARAMETER);
100 * The signature and checksum must both be correct
102 if (ACPI_STRNCMP ((char *) rsdp, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
103 /* Nope, BAD Signature */
105 status = AE_BAD_SIGNATURE;
109 /* Check the standard checksum */
111 if (acpi_tb_checksum (rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
112 status = AE_BAD_CHECKSUM;
116 /* Check extended checksum if table version >= 2 */
118 if (rsdp->revision >= 2) {
119 if (acpi_tb_checksum (rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0) {
120 status = AE_BAD_CHECKSUM;
125 /* The RSDP supplied is OK */
127 table_info.pointer = ACPI_CAST_PTR (struct acpi_table_header, rsdp);
128 table_info.length = sizeof (struct rsdp_descriptor);
129 table_info.allocation = ACPI_MEM_MAPPED;
131 /* Save the table pointers and allocation info */
133 status = acpi_tb_init_table_descriptor (ACPI_TABLE_RSDP, &table_info);
134 if (ACPI_FAILURE (status)) {
138 /* Save the RSDP in a global for easy access */
140 acpi_gbl_RSDP = ACPI_CAST_PTR (struct rsdp_descriptor, table_info.pointer);
141 return_ACPI_STATUS (status);
147 if (acpi_gbl_table_flags & ACPI_PHYSICAL_POINTER) {
148 acpi_os_unmap_memory (rsdp, sizeof (struct rsdp_descriptor));
150 return_ACPI_STATUS (status);
154 /*******************************************************************************
156 * FUNCTION: acpi_tb_get_rsdt_address
158 * PARAMETERS: out_address - Where the address is returned
160 * RETURN: None, Address
162 * DESCRIPTION: Extract the address of either the RSDT or XSDT, depending on the
163 * version of the RSDP and whether the XSDT pointer is valid
165 ******************************************************************************/
168 acpi_tb_get_rsdt_address (
169 struct acpi_pointer *out_address)
172 ACPI_FUNCTION_ENTRY ();
175 out_address->pointer_type = acpi_gbl_table_flags | ACPI_LOGICAL_ADDRESSING;
177 /* Use XSDT if it is present */
179 if ((acpi_gbl_RSDP->revision >= 2) &&
180 acpi_gbl_RSDP->xsdt_physical_address) {
181 out_address->pointer.value =
182 acpi_gbl_RSDP->xsdt_physical_address;
183 acpi_gbl_root_table_type = ACPI_TABLE_TYPE_XSDT;
186 /* No XSDT, use the RSDT */
188 out_address->pointer.value = acpi_gbl_RSDP->rsdt_physical_address;
189 acpi_gbl_root_table_type = ACPI_TABLE_TYPE_RSDT;
194 /*******************************************************************************
196 * FUNCTION: acpi_tb_validate_rsdt
198 * PARAMETERS: table_ptr - Addressable pointer to the RSDT.
202 * DESCRIPTION: Validate signature for the RSDT or XSDT
204 ******************************************************************************/
207 acpi_tb_validate_rsdt (
208 struct acpi_table_header *table_ptr)
213 ACPI_FUNCTION_NAME ("tb_validate_rsdt");
217 * Search for appropriate signature, RSDT or XSDT
219 if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
220 no_match = ACPI_STRNCMP ((char *) table_ptr, RSDT_SIG,
221 sizeof (RSDT_SIG) -1);
224 no_match = ACPI_STRNCMP ((char *) table_ptr, XSDT_SIG,
225 sizeof (XSDT_SIG) -1);
229 /* Invalid RSDT or XSDT signature */
232 "Invalid signature where RSDP indicates RSDT/XSDT should be located\n"));
234 ACPI_DUMP_BUFFER (acpi_gbl_RSDP, 20);
236 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_ERROR,
237 "RSDT/XSDT signature at %X (%p) is invalid\n",
238 acpi_gbl_RSDP->rsdt_physical_address,
239 (void *) (acpi_native_uint) acpi_gbl_RSDP->rsdt_physical_address));
241 if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
242 ACPI_REPORT_ERROR (("Looking for RSDT\n"))
245 ACPI_REPORT_ERROR (("Looking for XSDT\n"))
248 ACPI_DUMP_BUFFER ((char *) table_ptr, 48);
250 return (AE_BAD_SIGNATURE);
257 /*******************************************************************************
259 * FUNCTION: acpi_tb_get_table_rsdt
265 * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
267 ******************************************************************************/
270 acpi_tb_get_table_rsdt (
273 struct acpi_table_desc table_info;
275 struct acpi_pointer address;
278 ACPI_FUNCTION_TRACE ("tb_get_table_rsdt");
281 /* Get the RSDT/XSDT via the RSDP */
283 acpi_tb_get_rsdt_address (&address);
285 table_info.type = ACPI_TABLE_XSDT;
286 status = acpi_tb_get_table (&address, &table_info);
287 if (ACPI_FAILURE (status)) {
288 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not get the RSDT/XSDT, %s\n",
289 acpi_format_exception (status)));
291 return_ACPI_STATUS (status);
294 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
295 "RSDP located at %p, points to RSDT physical=%8.8X%8.8X \n",
297 ACPI_FORMAT_UINT64 (address.pointer.value)));
299 /* Check the RSDT or XSDT signature */
301 status = acpi_tb_validate_rsdt (table_info.pointer);
302 if (ACPI_FAILURE (status)) {
303 return_ACPI_STATUS (status);
306 /* Get the number of tables defined in the RSDT or XSDT */
308 acpi_gbl_rsdt_table_count = acpi_tb_get_table_count (acpi_gbl_RSDP,
311 /* Convert and/or copy to an XSDT structure */
313 status = acpi_tb_convert_to_xsdt (&table_info);
314 if (ACPI_FAILURE (status)) {
315 return_ACPI_STATUS (status);
318 /* Save the table pointers and allocation info */
320 status = acpi_tb_init_table_descriptor (ACPI_TABLE_XSDT, &table_info);
321 if (ACPI_FAILURE (status)) {
322 return_ACPI_STATUS (status);
325 acpi_gbl_XSDT = ACPI_CAST_PTR (XSDT_DESCRIPTOR, table_info.pointer);
327 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "XSDT located at %p\n", acpi_gbl_XSDT));
328 return_ACPI_STATUS (status);