forked from Minki/linux
488 lines
14 KiB
C
488 lines
14 KiB
C
/******************************************************************************
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*
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* Module Name: tbutils - table utilities
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2007, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/actables.h>
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME("tbutils")
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/* Local prototypes */
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static acpi_physical_address
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acpi_tb_get_root_table_entry(u8 * table_entry,
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acpi_native_uint table_entry_size);
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_tables_loaded
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*
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* PARAMETERS: None
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*
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* RETURN: TRUE if required ACPI tables are loaded
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*
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* DESCRIPTION: Determine if the minimum required ACPI tables are present
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* (FADT, FACS, DSDT)
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*
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******************************************************************************/
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u8 acpi_tb_tables_loaded(void)
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{
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if (acpi_gbl_root_table_list.count >= 3) {
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return (TRUE);
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}
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return (FALSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_print_table_header
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*
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* PARAMETERS: Address - Table physical address
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* Header - Table header
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*
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* RETURN: None
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*
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* DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
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*
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******************************************************************************/
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void
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acpi_tb_print_table_header(acpi_physical_address address,
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struct acpi_table_header *header)
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{
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if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
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/* FACS only has signature and length fields of common table header */
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ACPI_INFO((AE_INFO, "%4.4s %08lX, %04X",
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header->signature, (unsigned long)address,
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header->length));
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} else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
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/* RSDP has no common fields */
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ACPI_INFO((AE_INFO, "RSDP %08lX, %04X (r%d %6.6s)",
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(unsigned long)address,
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(ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
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revision >
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0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
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header)->length : 20,
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ACPI_CAST_PTR(struct acpi_table_rsdp,
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header)->revision,
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ACPI_CAST_PTR(struct acpi_table_rsdp,
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header)->oem_id));
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} else {
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/* Standard ACPI table with full common header */
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ACPI_INFO((AE_INFO,
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"%4.4s %08lX, %04X (r%d %6.6s %8.8s %8X %4.4s %8X)",
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header->signature, (unsigned long)address,
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header->length, header->revision, header->oem_id,
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header->oem_table_id, header->oem_revision,
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header->asl_compiler_id,
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header->asl_compiler_revision));
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_validate_checksum
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*
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* PARAMETERS: Table - ACPI table to verify
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* Length - Length of entire table
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*
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* RETURN: Status
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*
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* DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
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* exception on bad checksum.
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*
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******************************************************************************/
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acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
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{
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u8 checksum;
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/* Compute the checksum on the table */
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checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
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/* Checksum ok? (should be zero) */
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if (checksum) {
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ACPI_WARNING((AE_INFO,
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"Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X",
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table->signature, table->checksum,
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(u8) (table->checksum - checksum)));
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#if (ACPI_CHECKSUM_ABORT)
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return (AE_BAD_CHECKSUM);
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#endif
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_checksum
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*
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* PARAMETERS: Buffer - Pointer to memory region to be checked
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* Length - Length of this memory region
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*
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* RETURN: Checksum (u8)
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*
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* DESCRIPTION: Calculates circular checksum of memory region.
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*
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******************************************************************************/
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u8 acpi_tb_checksum(u8 * buffer, acpi_native_uint length)
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{
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u8 sum = 0;
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u8 *end = buffer + length;
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while (buffer < end) {
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sum = (u8) (sum + *(buffer++));
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}
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return sum;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_install_table
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*
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* PARAMETERS: Address - Physical address of DSDT or FACS
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* Flags - Flags
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* Signature - Table signature, NULL if no need to
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* match
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* table_index - Index into root table array
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*
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* RETURN: None
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*
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* DESCRIPTION: Install an ACPI table into the global data structure.
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*
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******************************************************************************/
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void
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acpi_tb_install_table(acpi_physical_address address,
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u8 flags, char *signature, acpi_native_uint table_index)
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{
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struct acpi_table_header *table;
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if (!address) {
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ACPI_ERROR((AE_INFO,
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"Null physical address for ACPI table [%s]",
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signature));
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return;
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}
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/* Map just the table header */
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table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
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if (!table) {
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return;
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}
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/* If a particular signature is expected, signature must match */
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if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
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ACPI_ERROR((AE_INFO,
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"Invalid signature 0x%X for ACPI table [%s]",
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*ACPI_CAST_PTR(u32, table->signature), signature));
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goto unmap_and_exit;
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}
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/* Initialize the table entry */
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acpi_gbl_root_table_list.tables[table_index].address = address;
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acpi_gbl_root_table_list.tables[table_index].length = table->length;
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acpi_gbl_root_table_list.tables[table_index].flags = flags;
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ACPI_MOVE_32_TO_32(&
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(acpi_gbl_root_table_list.tables[table_index].
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signature), table->signature);
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acpi_tb_print_table_header(address, table);
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if (table_index == ACPI_TABLE_INDEX_DSDT) {
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/* Global integer width is based upon revision of the DSDT */
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acpi_ut_set_integer_width(table->revision);
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}
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unmap_and_exit:
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acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_get_root_table_entry
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*
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* PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry
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* table_entry_size - sizeof 32 or 64 (RSDT or XSDT)
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*
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* RETURN: Physical address extracted from the root table
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*
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* DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
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* both 32-bit and 64-bit platforms
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*
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* NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
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* 64-bit platforms.
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*
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******************************************************************************/
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static acpi_physical_address
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acpi_tb_get_root_table_entry(u8 * table_entry,
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acpi_native_uint table_entry_size)
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{
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u64 address64;
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/*
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* Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
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* Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
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*/
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if (table_entry_size == sizeof(u32)) {
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/*
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* 32-bit platform, RSDT: Return 32-bit table entry
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* 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
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*/
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return ((acpi_physical_address)
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(*ACPI_CAST_PTR(u32, table_entry)));
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} else {
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/*
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* 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
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* 64-bit platform, XSDT: Move (unaligned) 64-bit to local, return 64-bit
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*/
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ACPI_MOVE_64_TO_64(&address64, table_entry);
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#if ACPI_MACHINE_WIDTH == 32
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if (address64 > ACPI_UINT32_MAX) {
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/* Will truncate 64-bit address to 32 bits, issue warning */
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ACPI_WARNING((AE_INFO,
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"64-bit Physical Address in XSDT is too large (%8.8X%8.8X), truncating",
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ACPI_FORMAT_UINT64(address64)));
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}
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#endif
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return ((acpi_physical_address) (address64));
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_parse_root_table
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*
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* PARAMETERS: Rsdp - Pointer to the RSDP
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* Flags - Flags
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*
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* RETURN: Status
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*
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* DESCRIPTION: This function is called to parse the Root System Description
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* Table (RSDT or XSDT)
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*
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* NOTE: Tables are mapped (not copied) for efficiency. The FACS must
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* be mapped and cannot be copied because it contains the actual
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* memory location of the ACPI Global Lock.
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*
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******************************************************************************/
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acpi_status __init
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acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
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{
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struct acpi_table_rsdp *rsdp;
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acpi_native_uint table_entry_size;
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acpi_native_uint i;
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u32 table_count;
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struct acpi_table_header *table;
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acpi_physical_address address;
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u32 length;
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u8 *table_entry;
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acpi_status status;
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ACPI_FUNCTION_TRACE(tb_parse_root_table);
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/*
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* Map the entire RSDP and extract the address of the RSDT or XSDT
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*/
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rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
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if (!rsdp) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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acpi_tb_print_table_header(rsdp_address,
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ACPI_CAST_PTR(struct acpi_table_header,
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rsdp));
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/* Differentiate between RSDT and XSDT root tables */
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if (rsdp->revision > 1 && rsdp->xsdt_physical_address) {
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/*
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* Root table is an XSDT (64-bit physical addresses). We must use the
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* XSDT if the revision is > 1 and the XSDT pointer is present, as per
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* the ACPI specification.
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*/
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address = (acpi_physical_address) rsdp->xsdt_physical_address;
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table_entry_size = sizeof(u64);
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} else {
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/* Root table is an RSDT (32-bit physical addresses) */
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address = (acpi_physical_address) rsdp->rsdt_physical_address;
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table_entry_size = sizeof(u32);
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}
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/*
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* It is not possible to map more than one entry in some environments,
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* so unmap the RSDP here before mapping other tables
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*/
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acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
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/* Map the RSDT/XSDT table header to get the full table length */
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table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
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if (!table) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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acpi_tb_print_table_header(address, table);
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/* Get the length of the full table, verify length and map entire table */
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length = table->length;
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acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
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if (length < sizeof(struct acpi_table_header)) {
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ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT",
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length));
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return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
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}
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table = acpi_os_map_memory(address, length);
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if (!table) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Validate the root table checksum */
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status = acpi_tb_verify_checksum(table, length);
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if (ACPI_FAILURE(status)) {
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acpi_os_unmap_memory(table, length);
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return_ACPI_STATUS(status);
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}
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/* Calculate the number of tables described in the root table */
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table_count =
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(u32) ((table->length -
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sizeof(struct acpi_table_header)) / table_entry_size);
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/*
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* First two entries in the table array are reserved for the DSDT and FACS,
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* which are not actually present in the RSDT/XSDT - they come from the FADT
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*/
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table_entry =
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ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
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acpi_gbl_root_table_list.count = 2;
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/*
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* Initialize the root table array from the RSDT/XSDT
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*/
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for (i = 0; i < table_count; i++) {
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if (acpi_gbl_root_table_list.count >=
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acpi_gbl_root_table_list.size) {
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/* There is no more room in the root table array, attempt resize */
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status = acpi_tb_resize_root_table_list();
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if (ACPI_FAILURE(status)) {
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ACPI_WARNING((AE_INFO,
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"Truncating %u table entries!",
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(unsigned)
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(acpi_gbl_root_table_list.size -
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acpi_gbl_root_table_list.
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count)));
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break;
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}
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}
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/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
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acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
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address =
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acpi_tb_get_root_table_entry(table_entry, table_entry_size);
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table_entry += table_entry_size;
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acpi_gbl_root_table_list.count++;
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}
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/*
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* It is not possible to map more than one entry in some environments,
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* so unmap the root table here before mapping other tables
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*/
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acpi_os_unmap_memory(table, length);
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/*
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* Complete the initialization of the root table array by examining
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* the header of each table
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*/
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for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
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acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
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address, flags, NULL, i);
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/* Special case for FADT - get the DSDT and FACS */
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if (ACPI_COMPARE_NAME
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(&acpi_gbl_root_table_list.tables[i].signature,
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ACPI_SIG_FADT)) {
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acpi_tb_parse_fadt(i, flags);
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}
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}
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return_ACPI_STATUS(AE_OK);
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}
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