1 files changed, 240 insertions, 0 deletions
diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c
new file mode 100644
index 000000000000..fede5804c783
--- /dev/null
+++ b/drivers/acpi/tables/tbutils.c
@@ -0,0 +1,240 @@
+/******************************************************************************
+ *
+ * Module Name: tbutils - Table manipulation utilities
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, 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    ("tbutils")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_handle_to_object
+ *
+ * PARAMETERS:  table_id            - Id for which the function is searching
+ *              table_desc          - Pointer to return the matching table
+ *                                      descriptor.
+ *
+ * RETURN:      Search the tables to find one with a matching table_id and
+ *              return a pointer to that table descriptor.
+ *
+ ******************************************************************************/
+#ifdef ACPI_FUTURE_USAGE
+acpi_status
+acpi_tb_handle_to_object (
+	u16                             table_id,
+	struct acpi_table_desc          **return_table_desc)
+{
+	u32                             i;
+	struct acpi_table_desc          *table_desc;
+
+
+	ACPI_FUNCTION_NAME ("tb_handle_to_object");
+
+
+	for (i = 0; i < ACPI_TABLE_MAX; i++) {
+		table_desc = acpi_gbl_table_lists[i].next;
+		while (table_desc) {
+			if (table_desc->table_id == table_id) {
+				*return_table_desc = table_desc;
+				return (AE_OK);
+			}
+
+			table_desc = table_desc->next;
+		}
+	}
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "table_id=%X does not exist\n", table_id));
+	return (AE_BAD_PARAMETER);
+}
+#endif  /*  ACPI_FUTURE_USAGE  */
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_validate_table_header
+ *
+ * PARAMETERS:  table_header        - Logical pointer to the table
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Check an ACPI table header for validity
+ *
+ * NOTE:  Table pointers are validated as follows:
+ *          1) Table pointer must point to valid physical memory
+ *          2) Signature must be 4 ASCII chars, even if we don't recognize the
+ *             name
+ *          3) Table must be readable for length specified in the header
+ *          4) Table checksum must be valid (with the exception of the FACS
+ *              which has no checksum because it contains variable fields)
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_validate_table_header (
+	struct acpi_table_header        *table_header)
+{
+	acpi_name                       signature;
+
+
+	ACPI_FUNCTION_NAME ("tb_validate_table_header");
+
+
+	/* Verify that this is a valid address */
+
+	if (!acpi_os_readable (table_header, sizeof (struct acpi_table_header))) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"Cannot read table header at %p\n", table_header));
+		return (AE_BAD_ADDRESS);
+	}
+
+	/* Ensure that the signature is 4 ASCII characters */
+
+	ACPI_MOVE_32_TO_32 (&signature, table_header->signature);
+	if (!acpi_ut_valid_acpi_name (signature)) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"Table signature at %p [%p] has invalid characters\n",
+			table_header, &signature));
+
+		ACPI_REPORT_WARNING (("Invalid table signature found: [%4.4s]\n",
+			(char *) &signature));
+		ACPI_DUMP_BUFFER (table_header, sizeof (struct acpi_table_header));
+		return (AE_BAD_SIGNATURE);
+	}
+
+	/* Validate the table length */
+
+	if (table_header->length < sizeof (struct acpi_table_header)) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"Invalid length in table header %p name %4.4s\n",
+			table_header, (char *) &signature));
+
+		ACPI_REPORT_WARNING (("Invalid table header length (0x%X) found\n",
+			(u32) table_header->length));
+		ACPI_DUMP_BUFFER (table_header, sizeof (struct acpi_table_header));
+		return (AE_BAD_HEADER);
+	}
+
+	return (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_verify_table_checksum
+ *
+ * PARAMETERS:  *table_header           - ACPI table to verify
+ *
+ * RETURN:      8 bit checksum of table
+ *
+ * DESCRIPTION: Does an 8 bit checksum of table and returns status.  A correct
+ *              table should have a checksum of 0.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_verify_table_checksum (
+	struct acpi_table_header        *table_header)
+{
+	u8                              checksum;
+	acpi_status                     status = AE_OK;
+
+
+	ACPI_FUNCTION_TRACE ("tb_verify_table_checksum");
+
+
+	/* Compute the checksum on the table */
+
+	checksum = acpi_tb_checksum (table_header, table_header->length);
+
+	/* Return the appropriate exception */
+
+	if (checksum) {
+		ACPI_REPORT_WARNING (("Invalid checksum in table [%4.4s] (%02X, sum %02X is not zero)\n",
+			table_header->signature, (u32) table_header->checksum, (u32) checksum));
+
+		status = AE_BAD_CHECKSUM;
+	}
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_checksum
+ *
+ * PARAMETERS:  Buffer              - Buffer to checksum
+ *              Length              - Size of the buffer
+ *
+ * RETURNS      8 bit checksum of buffer
+ *
+ * DESCRIPTION: Computes an 8 bit checksum of the buffer(length) and returns it.
+ *
+ ******************************************************************************/
+
+u8
+acpi_tb_checksum (
+	void                            *buffer,
+	u32                             length)
+{
+	const u8                        *limit;
+	const u8                        *rover;
+	u8                              sum = 0;
+
+
+	if (buffer && length) {
+		/*  Buffer and Length are valid   */
+
+		limit = (u8 *) buffer + length;
+
+		for (rover = buffer; rover < limit; rover++) {
+			sum = (u8) (sum + *rover);
+		}
+	}
+	return (sum);
+}
+
+