1 files changed, 493 insertions, 0 deletions
diff --git a/drivers/acpi/tables/tbget.c b/drivers/acpi/tables/tbget.c
new file mode 100644
index 000000000000..896f3ddda62e
--- /dev/null
+++ b/drivers/acpi/tables/tbget.c
@@ -0,0 +1,493 @@
+/******************************************************************************
+ *
+ * Module Name: tbget - ACPI Table get* routines
+ *
+ *****************************************************************************/
+
+/*
+ * 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    ("tbget")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_get_table
+ *
+ * PARAMETERS:  Address             - Address of table to retrieve.  Can be
+ *                                    Logical or Physical
+ *              table_info          - Where table info is returned
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Get entire table of unknown size.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_get_table (
+	struct acpi_pointer             *address,
+	struct acpi_table_desc          *table_info)
+{
+	acpi_status                     status;
+	struct acpi_table_header        header;
+
+
+	ACPI_FUNCTION_TRACE ("tb_get_table");
+
+
+	/*
+	 * Get the header in order to get signature and table size
+	 */
+	status = acpi_tb_get_table_header (address, &header);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	/* Get the entire table */
+
+	status = acpi_tb_get_table_body (address, &header, table_info);
+	if (ACPI_FAILURE (status)) {
+		ACPI_REPORT_ERROR (("Could not get ACPI table (size %X), %s\n",
+			header.length, acpi_format_exception (status)));
+		return_ACPI_STATUS (status);
+	}
+
+	return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_get_table_header
+ *
+ * PARAMETERS:  Address             - Address of table to retrieve.  Can be
+ *                                    Logical or Physical
+ *              return_header       - Where the table header is returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Get an ACPI table header.  Works in both physical or virtual
+ *              addressing mode.  Works with both physical or logical pointers.
+ *              Table is either copied or mapped, depending on the pointer
+ *              type and mode of the processor.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_get_table_header (
+	struct acpi_pointer             *address,
+	struct acpi_table_header        *return_header)
+{
+	acpi_status                     status = AE_OK;
+	struct acpi_table_header        *header = NULL;
+
+
+	ACPI_FUNCTION_TRACE ("tb_get_table_header");
+
+
+	/*
+	 * Flags contains the current processor mode (Virtual or Physical addressing)
+	 * The pointer_type is either Logical or Physical
+	 */
+	switch (address->pointer_type) {
+	case ACPI_PHYSMODE_PHYSPTR:
+	case ACPI_LOGMODE_LOGPTR:
+
+		/* Pointer matches processor mode, copy the header */
+
+		ACPI_MEMCPY (return_header, address->pointer.logical, sizeof (struct acpi_table_header));
+		break;
+
+
+	case ACPI_LOGMODE_PHYSPTR:
+
+		/* Create a logical address for the physical pointer*/
+
+		status = acpi_os_map_memory (address->pointer.physical, sizeof (struct acpi_table_header),
+				  (void *) &header);
+		if (ACPI_FAILURE (status)) {
+			ACPI_REPORT_ERROR (("Could not map memory at %8.8X%8.8X for length %X\n",
+				ACPI_FORMAT_UINT64 (address->pointer.physical),
+				sizeof (struct acpi_table_header)));
+			return_ACPI_STATUS (status);
+		}
+
+		/* Copy header and delete mapping */
+
+		ACPI_MEMCPY (return_header, header, sizeof (struct acpi_table_header));
+		acpi_os_unmap_memory (header, sizeof (struct acpi_table_header));
+		break;
+
+
+	default:
+
+		ACPI_REPORT_ERROR (("Invalid address flags %X\n",
+			address->pointer_type));
+		return_ACPI_STATUS (AE_BAD_PARAMETER);
+	}
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Table Signature: [%4.4s]\n",
+		return_header->signature));
+
+	return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_get_table_body
+ *
+ * PARAMETERS:  Address             - Address of table to retrieve.  Can be
+ *                                    Logical or Physical
+ *              Header              - Header of the table to retrieve
+ *              table_info          - Where the table info is returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Get an entire ACPI table with support to allow the host OS to
+ *              replace the table with a newer version (table override.)
+ *              Works in both physical or virtual
+ *              addressing mode.  Works with both physical or logical pointers.
+ *              Table is either copied or mapped, depending on the pointer
+ *              type and mode of the processor.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_get_table_body (
+	struct acpi_pointer             *address,
+	struct acpi_table_header        *header,
+	struct acpi_table_desc          *table_info)
+{
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("tb_get_table_body");
+
+
+	if (!table_info || !address) {
+		return_ACPI_STATUS (AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * Attempt table override.
+	 */
+	status = acpi_tb_table_override (header, table_info);
+	if (ACPI_SUCCESS (status)) {
+		/* Table was overridden by the host OS */
+
+		return_ACPI_STATUS (status);
+	}
+
+	/* No override, get the original table */
+
+	status = acpi_tb_get_this_table (address, header, table_info);
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_table_override
+ *
+ * PARAMETERS:  Header              - Pointer to table header
+ *              table_info          - Return info if table is overridden
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Attempts override of current table with a new one if provided
+ *              by the host OS.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_table_override (
+	struct acpi_table_header        *header,
+	struct acpi_table_desc          *table_info)
+{
+	struct acpi_table_header        *new_table;
+	acpi_status                     status;
+	struct acpi_pointer             address;
+
+
+	ACPI_FUNCTION_TRACE ("tb_table_override");
+
+
+	/*
+	 * The OSL will examine the header and decide whether to override this
+	 * table.  If it decides to override, a table will be returned in new_table,
+	 * which we will then copy.
+	 */
+	status = acpi_os_table_override (header, &new_table);
+	if (ACPI_FAILURE (status)) {
+		/* Some severe error from the OSL, but we basically ignore it */
+
+		ACPI_REPORT_ERROR (("Could not override ACPI table, %s\n",
+			acpi_format_exception (status)));
+		return_ACPI_STATUS (status);
+	}
+
+	if (!new_table) {
+		/* No table override */
+
+		return_ACPI_STATUS (AE_NO_ACPI_TABLES);
+	}
+
+	/*
+	 * We have a new table to override the old one.  Get a copy of
+	 * the new one.  We know that the new table has a logical pointer.
+	 */
+	address.pointer_type    = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
+	address.pointer.logical = new_table;
+
+	status = acpi_tb_get_this_table (&address, new_table, table_info);
+	if (ACPI_FAILURE (status)) {
+		ACPI_REPORT_ERROR (("Could not copy override ACPI table, %s\n",
+			acpi_format_exception (status)));
+		return_ACPI_STATUS (status);
+	}
+
+	/* Copy the table info */
+
+	ACPI_REPORT_INFO (("Table [%4.4s] replaced by host OS\n",
+		table_info->pointer->signature));
+
+	return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_get_this_table
+ *
+ * PARAMETERS:  Address             - Address of table to retrieve.  Can be
+ *                                    Logical or Physical
+ *              Header              - Header of the table to retrieve
+ *              table_info          - Where the table info is returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Get an entire ACPI table.  Works in both physical or virtual
+ *              addressing mode.  Works with both physical or logical pointers.
+ *              Table is either copied or mapped, depending on the pointer
+ *              type and mode of the processor.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_get_this_table (
+	struct acpi_pointer             *address,
+	struct acpi_table_header        *header,
+	struct acpi_table_desc          *table_info)
+{
+	struct acpi_table_header        *full_table = NULL;
+	u8                              allocation;
+	acpi_status                     status = AE_OK;
+
+
+	ACPI_FUNCTION_TRACE ("tb_get_this_table");
+
+
+	/*
+	 * Flags contains the current processor mode (Virtual or Physical addressing)
+	 * The pointer_type is either Logical or Physical
+	 */
+	switch (address->pointer_type) {
+	case ACPI_PHYSMODE_PHYSPTR:
+	case ACPI_LOGMODE_LOGPTR:
+
+		/* Pointer matches processor mode, copy the table to a new buffer */
+
+		full_table = ACPI_MEM_ALLOCATE (header->length);
+		if (!full_table) {
+			ACPI_REPORT_ERROR (("Could not allocate table memory for [%4.4s] length %X\n",
+				header->signature, header->length));
+			return_ACPI_STATUS (AE_NO_MEMORY);
+		}
+
+		/* Copy the entire table (including header) to the local buffer */
+
+		ACPI_MEMCPY (full_table, address->pointer.logical, header->length);
+
+		/* Save allocation type */
+
+		allocation = ACPI_MEM_ALLOCATED;
+		break;
+
+
+	case ACPI_LOGMODE_PHYSPTR:
+
+		/*
+		 * Just map the table's physical memory
+		 * into our address space.
+		 */
+		status = acpi_os_map_memory (address->pointer.physical, (acpi_size) header->length,
+				  (void *) &full_table);
+		if (ACPI_FAILURE (status)) {
+			ACPI_REPORT_ERROR (("Could not map memory for table [%4.4s] at %8.8X%8.8X for length %X\n",
+				header->signature,
+				ACPI_FORMAT_UINT64 (address->pointer.physical), header->length));
+			return (status);
+		}
+
+		/* Save allocation type */
+
+		allocation = ACPI_MEM_MAPPED;
+		break;
+
+
+	default:
+
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid address flags %X\n",
+			address->pointer_type));
+		return_ACPI_STATUS (AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * Validate checksum for _most_ tables,
+	 * even the ones whose signature we don't recognize
+	 */
+	if (table_info->type != ACPI_TABLE_FACS) {
+		status = acpi_tb_verify_table_checksum (full_table);
+
+#if (!ACPI_CHECKSUM_ABORT)
+		if (ACPI_FAILURE (status)) {
+			/* Ignore the error if configuration says so */
+
+			status = AE_OK;
+		}
+#endif
+	}
+
+	/* Return values */
+
+	table_info->pointer     = full_table;
+	table_info->length      = (acpi_size) header->length;
+	table_info->allocation  = allocation;
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+		"Found table [%4.4s] at %8.8X%8.8X, mapped/copied to %p\n",
+		full_table->signature,
+		ACPI_FORMAT_UINT64 (address->pointer.physical), full_table));
+
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_get_table_ptr
+ *
+ * PARAMETERS:  table_type      - one of the defined table types
+ *              Instance        - Which table of this type
+ *              table_ptr_loc   - pointer to location to place the pointer for
+ *                                return
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: This function is called to get the pointer to an ACPI table.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_get_table_ptr (
+	acpi_table_type                 table_type,
+	u32                             instance,
+	struct acpi_table_header        **table_ptr_loc)
+{
+	struct acpi_table_desc          *table_desc;
+	u32                             i;
+
+
+	ACPI_FUNCTION_TRACE ("tb_get_table_ptr");
+
+
+	if (!acpi_gbl_DSDT) {
+		return_ACPI_STATUS (AE_NO_ACPI_TABLES);
+	}
+
+	if (table_type > ACPI_TABLE_MAX) {
+		return_ACPI_STATUS (AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * For all table types (Single/Multiple), the first
+	 * instance is always in the list head.
+	 */
+	if (instance == 1) {
+		/* Get the first */
+
+		*table_ptr_loc = NULL;
+		if (acpi_gbl_table_lists[table_type].next) {
+			*table_ptr_loc = acpi_gbl_table_lists[table_type].next->pointer;
+		}
+		return_ACPI_STATUS (AE_OK);
+	}
+
+	/*
+	 * Check for instance out of range
+	 */
+	if (instance > acpi_gbl_table_lists[table_type].count) {
+		return_ACPI_STATUS (AE_NOT_EXIST);
+	}
+
+	/* Walk the list to get the desired table
+	 * Since the if (Instance == 1) check above checked for the
+	 * first table, setting table_desc equal to the .Next member
+	 * is actually pointing to the second table.  Therefore, we
+	 * need to walk from the 2nd table until we reach the Instance
+	 * that the user is looking for and return its table pointer.
+	 */
+	table_desc = acpi_gbl_table_lists[table_type].next;
+	for (i = 2; i < instance; i++) {
+		table_desc = table_desc->next;
+	}
+
+	/* We are now pointing to the requested table's descriptor */
+
+	*table_ptr_loc = table_desc->pointer;
+
+	return_ACPI_STATUS (AE_OK);
+}
+