1 files changed, 126 insertions, 0 deletions

diff --git a/drivers/acpi/tables/tbfind.c b/drivers/acpi/tables/tbfind.c
new file mode 100644
index 000000000000..769213c74c16
--- /dev/null
+++ b/drivers/acpi/tables/tbfind.c
@@ -0,0 +1,126 @@
+/******************************************************************************
+ *
+ * Module Name: tbfind   - find table
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2006, R. Byron Moore
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <acpi/acpi.h>
+#include <acpi/actables.h>
+
+#define _COMPONENT          ACPI_TABLES
+ACPI_MODULE_NAME("tbfind")
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_find_table
+ *
+ * PARAMETERS:  Signature           - String with ACPI table signature
+ *              oem_id              - String with the table OEM ID
+ *              oem_table_id        - String with the OEM Table ID
+ *              table_index         - Where the table index is returned
+ *
+ * RETURN:      Status and table index
+ *
+ * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
+ *              Signature, OEM ID and OEM Table ID. Returns an index that can
+ *              be used to get the table header or entire table.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_tb_find_table(char *signature,
+                   char *oem_id,
+                   char *oem_table_id, acpi_native_uint * table_index)
+{
+        acpi_native_uint i;
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE(tb_find_table);
+
+        for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
+                if (ACPI_MEMCMP(&(acpi_gbl_root_table_list.tables[i].signature),
+                                signature, ACPI_NAME_SIZE)) {
+
+                        /* Not the requested table */
+
+                        continue;
+                }
+
+                /* Table with matching signature has been found */
+
+                if (!acpi_gbl_root_table_list.tables[i].pointer) {
+
+                        /* Table is not currently mapped, map it */
+
+                        status =
+                            acpi_tb_verify_table(&acpi_gbl_root_table_list.
+                                                 tables[i]);
+                        if (ACPI_FAILURE(status)) {
+                                return_ACPI_STATUS(status);
+                        }
+
+                        if (!acpi_gbl_root_table_list.tables[i].pointer) {
+                                continue;
+                        }
+                }
+
+                /* Check for table match on all IDs */
+
+                if (!ACPI_MEMCMP
+                    (acpi_gbl_root_table_list.tables[i].pointer->signature,
+                     signature, ACPI_NAME_SIZE) && (!oem_id[0]
+                                                    ||
+                                                    !ACPI_MEMCMP
+                                                    (acpi_gbl_root_table_list.
+                                                     tables[i].pointer->oem_id,
+                                                     oem_id, ACPI_OEM_ID_SIZE))
+                    && (!oem_table_id[0]
+                        || !ACPI_MEMCMP(acpi_gbl_root_table_list.tables[i].
+                                        pointer->oem_table_id, oem_table_id,
+                                        ACPI_OEM_TABLE_ID_SIZE))) {
+                        *table_index = i;
+
+                        ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
+                                          "Found table [%4.4s]\n", signature));
+                        return_ACPI_STATUS(AE_OK);
+                }
+        }
+
+        return_ACPI_STATUS(AE_NOT_FOUND);
+}