--- /dev/null
- if (rsdp->revision > 1 && rsdp->xsdt_physical_address) {
+/******************************************************************************
+ *
+ * Module Name: tbutils - table utilities
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, Intel Corp.
+ * 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 "accommon.h"
+#include "actables.h"
+
+#define _COMPONENT ACPI_TABLES
+ACPI_MODULE_NAME("tbutils")
+
+/* Local prototypes */
+static acpi_physical_address
+acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_check_xsdt
+ *
+ * PARAMETERS: address - Pointer to the XSDT
+ *
+ * RETURN: status
+ * AE_OK - XSDT is okay
+ * AE_NO_MEMORY - can't map XSDT
+ * AE_INVALID_TABLE_LENGTH - invalid table length
+ * AE_NULL_ENTRY - XSDT has NULL entry
+ *
+ * DESCRIPTION: validate XSDT
+******************************************************************************/
+
+static acpi_status
+acpi_tb_check_xsdt(acpi_physical_address address)
+{
+ struct acpi_table_header *table;
+ u32 length;
+ u64 xsdt_entry_address;
+ u8 *table_entry;
+ u32 table_count;
+ int i;
+
+ table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
+ if (!table)
+ return AE_NO_MEMORY;
+
+ length = table->length;
+ acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+ if (length < sizeof(struct acpi_table_header))
+ return AE_INVALID_TABLE_LENGTH;
+
+ table = acpi_os_map_memory(address, length);
+ if (!table)
+ return AE_NO_MEMORY;
+
+ /* Calculate the number of tables described in XSDT */
+ table_count =
+ (u32) ((table->length -
+ sizeof(struct acpi_table_header)) / sizeof(u64));
+ table_entry =
+ ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
+ for (i = 0; i < table_count; i++) {
+ ACPI_MOVE_64_TO_64(&xsdt_entry_address, table_entry);
+ if (!xsdt_entry_address) {
+ /* XSDT has NULL entry */
+ break;
+ }
+ table_entry += sizeof(u64);
+ }
+ acpi_os_unmap_memory(table, length);
+
+ if (i < table_count)
+ return AE_NULL_ENTRY;
+ else
+ return AE_OK;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_initialize_facs
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
+ * for accessing the Global Lock and Firmware Waking Vector
+ *
+ ******************************************************************************/
+
+acpi_status acpi_tb_initialize_facs(void)
+{
+ acpi_status status;
+
+ status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
+ ACPI_CAST_INDIRECT_PTR(struct
+ acpi_table_header,
+ &acpi_gbl_FACS));
+ return status;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_tables_loaded
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: TRUE if required ACPI tables are loaded
+ *
+ * DESCRIPTION: Determine if the minimum required ACPI tables are present
+ * (FADT, FACS, DSDT)
+ *
+ ******************************************************************************/
+
+u8 acpi_tb_tables_loaded(void)
+{
+
+ if (acpi_gbl_root_table_list.count >= 3) {
+ return (TRUE);
+ }
+
+ return (FALSE);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_print_table_header
+ *
+ * PARAMETERS: Address - Table physical address
+ * Header - Table header
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
+ *
+ ******************************************************************************/
+
+void
+acpi_tb_print_table_header(acpi_physical_address address,
+ struct acpi_table_header *header)
+{
+
+ if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
+
+ /* FACS only has signature and length fields of common table header */
+
+ ACPI_INFO((AE_INFO, "%4.4s %08lX, %04X",
+ header->signature, (unsigned long)address,
+ header->length));
+ } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
+
+ /* RSDP has no common fields */
+
+ ACPI_INFO((AE_INFO, "RSDP %08lX, %04X (r%d %6.6s)",
+ (unsigned long)address,
+ (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
+ revision >
+ 0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
+ header)->length : 20,
+ ACPI_CAST_PTR(struct acpi_table_rsdp,
+ header)->revision,
+ ACPI_CAST_PTR(struct acpi_table_rsdp,
+ header)->oem_id));
+ } else {
+ /* Standard ACPI table with full common header */
+
+ ACPI_INFO((AE_INFO,
+ "%4.4s %08lX, %04X (r%d %6.6s %8.8s %8X %4.4s %8X)",
+ header->signature, (unsigned long)address,
+ header->length, header->revision, header->oem_id,
+ header->oem_table_id, header->oem_revision,
+ header->asl_compiler_id,
+ header->asl_compiler_revision));
+ }
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_validate_checksum
+ *
+ * PARAMETERS: Table - ACPI table to verify
+ * Length - Length of entire table
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
+ * exception on bad checksum.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
+{
+ u8 checksum;
+
+ /* Compute the checksum on the table */
+
+ checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
+
+ /* Checksum ok? (should be zero) */
+
+ if (checksum) {
+ ACPI_WARNING((AE_INFO,
+ "Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X",
+ table->signature, table->checksum,
+ (u8) (table->checksum - checksum)));
+
+#if (ACPI_CHECKSUM_ABORT)
+
+ return (AE_BAD_CHECKSUM);
+#endif
+ }
+
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_checksum
+ *
+ * PARAMETERS: Buffer - Pointer to memory region to be checked
+ * Length - Length of this memory region
+ *
+ * RETURN: Checksum (u8)
+ *
+ * DESCRIPTION: Calculates circular checksum of memory region.
+ *
+ ******************************************************************************/
+
+u8 acpi_tb_checksum(u8 *buffer, u32 length)
+{
+ u8 sum = 0;
+ u8 *end = buffer + length;
+
+ while (buffer < end) {
+ sum = (u8) (sum + *(buffer++));
+ }
+
+ return sum;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_install_table
+ *
+ * PARAMETERS: Address - Physical address of DSDT or FACS
+ * Flags - Flags
+ * Signature - Table signature, NULL if no need to
+ * match
+ * table_index - Index into root table array
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Install an ACPI table into the global data structure.
+ *
+ ******************************************************************************/
+
+void
+acpi_tb_install_table(acpi_physical_address address,
+ u8 flags, char *signature, u32 table_index)
+{
+ struct acpi_table_header *table;
+
+ if (!address) {
+ ACPI_ERROR((AE_INFO,
+ "Null physical address for ACPI table [%s]",
+ signature));
+ return;
+ }
+
+ /* Map just the table header */
+
+ table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
+ if (!table) {
+ return;
+ }
+
+ /* If a particular signature is expected, signature must match */
+
+ if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
+ ACPI_ERROR((AE_INFO,
+ "Invalid signature 0x%X for ACPI table [%s]",
+ *ACPI_CAST_PTR(u32, table->signature), signature));
+ goto unmap_and_exit;
+ }
+
+ /* Initialize the table entry */
+
+ acpi_gbl_root_table_list.tables[table_index].address = address;
+ acpi_gbl_root_table_list.tables[table_index].length = table->length;
+ acpi_gbl_root_table_list.tables[table_index].flags = flags;
+
+ ACPI_MOVE_32_TO_32(&
+ (acpi_gbl_root_table_list.tables[table_index].
+ signature), table->signature);
+
+ acpi_tb_print_table_header(address, table);
+
+ if (table_index == ACPI_TABLE_INDEX_DSDT) {
+
+ /* Global integer width is based upon revision of the DSDT */
+
+ acpi_ut_set_integer_width(table->revision);
+ }
+
+ unmap_and_exit:
+ acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_get_root_table_entry
+ *
+ * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry
+ * table_entry_size - sizeof 32 or 64 (RSDT or XSDT)
+ *
+ * RETURN: Physical address extracted from the root table
+ *
+ * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
+ * both 32-bit and 64-bit platforms
+ *
+ * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
+ * 64-bit platforms.
+ *
+ ******************************************************************************/
+
+static acpi_physical_address
+acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
+{
+ u64 address64;
+
+ /*
+ * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
+ * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
+ */
+ if (table_entry_size == sizeof(u32)) {
+ /*
+ * 32-bit platform, RSDT: Return 32-bit table entry
+ * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
+ */
+ return ((acpi_physical_address)
+ (*ACPI_CAST_PTR(u32, table_entry)));
+ } else {
+ /*
+ * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
+ * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, return 64-bit
+ */
+ ACPI_MOVE_64_TO_64(&address64, table_entry);
+
+#if ACPI_MACHINE_WIDTH == 32
+ if (address64 > ACPI_UINT32_MAX) {
+
+ /* Will truncate 64-bit address to 32 bits, issue warning */
+
+ ACPI_WARNING((AE_INFO,
+ "64-bit Physical Address in XSDT is too large (%8.8X%8.8X), truncating",
+ ACPI_FORMAT_UINT64(address64)));
+ }
+#endif
+ return ((acpi_physical_address) (address64));
+ }
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_parse_root_table
+ *
+ * PARAMETERS: Rsdp - Pointer to the RSDP
+ * Flags - Flags
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: This function is called to parse the Root System Description
+ * Table (RSDT or XSDT)
+ *
+ * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
+ * be mapped and cannot be copied because it contains the actual
+ * memory location of the ACPI Global Lock.
+ *
+ ******************************************************************************/
+
+acpi_status __init
+acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
+{
+ struct acpi_table_rsdp *rsdp;
+ u32 table_entry_size;
+ u32 i;
+ u32 table_count;
+ struct acpi_table_header *table;
+ acpi_physical_address address;
+ acpi_physical_address uninitialized_var(rsdt_address);
+ u32 length;
+ u8 *table_entry;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(tb_parse_root_table);
+
+ /*
+ * Map the entire RSDP and extract the address of the RSDT or XSDT
+ */
+ rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
+ if (!rsdp) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ acpi_tb_print_table_header(rsdp_address,
+ ACPI_CAST_PTR(struct acpi_table_header,
+ rsdp));
+
+ /* Differentiate between RSDT and XSDT root tables */
+
++ if (rsdp->revision > 1 && rsdp->xsdt_physical_address
++ && !acpi_rsdt_forced) {
+ /*
+ * Root table is an XSDT (64-bit physical addresses). We must use the
+ * XSDT if the revision is > 1 and the XSDT pointer is present, as per
+ * the ACPI specification.
+ */
+ address = (acpi_physical_address) rsdp->xsdt_physical_address;
+ table_entry_size = sizeof(u64);
+ rsdt_address = (acpi_physical_address)
+ rsdp->rsdt_physical_address;
+ } else {
+ /* Root table is an RSDT (32-bit physical addresses) */
+
+ address = (acpi_physical_address) rsdp->rsdt_physical_address;
+ table_entry_size = sizeof(u32);
+ }
+
+ /*
+ * It is not possible to map more than one entry in some environments,
+ * so unmap the RSDP here before mapping other tables
+ */
+ acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
+
+ if (table_entry_size == sizeof(u64)) {
+ if (acpi_tb_check_xsdt(address) == AE_NULL_ENTRY) {
+ /* XSDT has NULL entry, RSDT is used */
+ address = rsdt_address;
+ table_entry_size = sizeof(u32);
+ ACPI_WARNING((AE_INFO, "BIOS XSDT has NULL entry, "
+ "using RSDT"));
+ }
+ }
+ /* Map the RSDT/XSDT table header to get the full table length */
+
+ table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
+ if (!table) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ acpi_tb_print_table_header(address, table);
+
+ /* Get the length of the full table, verify length and map entire table */
+
+ length = table->length;
+ acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+
+ if (length < sizeof(struct acpi_table_header)) {
+ ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT",
+ length));
+ return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
+ }
+
+ table = acpi_os_map_memory(address, length);
+ if (!table) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ /* Validate the root table checksum */
+
+ status = acpi_tb_verify_checksum(table, length);
+ if (ACPI_FAILURE(status)) {
+ acpi_os_unmap_memory(table, length);
+ return_ACPI_STATUS(status);
+ }
+
+ /* Calculate the number of tables described in the root table */
+
+ table_count =
+ (u32) ((table->length -
+ sizeof(struct acpi_table_header)) / table_entry_size);
+
+ /*
+ * First two entries in the table array are reserved for the DSDT and FACS,
+ * which are not actually present in the RSDT/XSDT - they come from the FADT
+ */
+ table_entry =
+ ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
+ acpi_gbl_root_table_list.count = 2;
+
+ /*
+ * Initialize the root table array from the RSDT/XSDT
+ */
+ for (i = 0; i < table_count; i++) {
+ if (acpi_gbl_root_table_list.count >=
+ acpi_gbl_root_table_list.size) {
+
+ /* There is no more room in the root table array, attempt resize */
+
+ status = acpi_tb_resize_root_table_list();
+ if (ACPI_FAILURE(status)) {
+ ACPI_WARNING((AE_INFO,
+ "Truncating %u table entries!",
+ (unsigned)
+ (acpi_gbl_root_table_list.size -
+ acpi_gbl_root_table_list.
+ count)));
+ break;
+ }
+ }
+
+ /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
+
+ acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
+ address =
+ acpi_tb_get_root_table_entry(table_entry, table_entry_size);
+
+ table_entry += table_entry_size;
+ acpi_gbl_root_table_list.count++;
+ }
+
+ /*
+ * It is not possible to map more than one entry in some environments,
+ * so unmap the root table here before mapping other tables
+ */
+ acpi_os_unmap_memory(table, length);
+
+ /*
+ * Complete the initialization of the root table array by examining
+ * the header of each table
+ */
+ for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
+ acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
+ address, flags, NULL, i);
+
+ /* Special case for FADT - get the DSDT and FACS */
+
+ if (ACPI_COMPARE_NAME
+ (&acpi_gbl_root_table_list.tables[i].signature,
+ ACPI_SIG_FADT)) {
+ acpi_tb_parse_fadt(i, flags);
+ }
+ }
+
+ return_ACPI_STATUS(AE_OK);
+}
projects / cascardo / linux.git / commitdiff