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/******************************************************************************
*
* Module Name: tbutils - ACPI Table utilities
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2013, 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;
}
#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
*
* 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;
/* If Hardware Reduced flag is set, there is no FACS */
if (acpi_gbl_reduced_hardware) {
acpi_gbl_FACS = NULL;
return (AE_OK);
}
status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
ACPI_CAST_INDIRECT_PTR(struct
acpi_table_header,
&acpi_gbl_FACS));
return (status);
}
#endif /* !ACPI_REDUCED_HARDWARE */
/*******************************************************************************
*
* 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.current_table_count >= 3) {
return (TRUE);
}
return (FALSE);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_check_dsdt_header
*
* PARAMETERS: None
*
* RETURN: None
*
* DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
* if the DSDT has been replaced from outside the OS and/or if
* the DSDT header has been corrupted.
*
******************************************************************************/
void acpi_tb_check_dsdt_header(void)
{
/* Compare original length and checksum to current values */
if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length ||
acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) {
ACPI_BIOS_ERROR((AE_INFO,
"The DSDT has been corrupted or replaced - "
"old, new headers below"));
acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
acpi_tb_print_table_header(0, acpi_gbl_DSDT);
ACPI_ERROR((AE_INFO,
"Please send DMI info to linux-acpi@vger.kernel.org\n"
"If system does not work as expected, please boot with acpi=copy_dsdt"));
/* Disable further error messages */
acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
acpi_gbl_original_dsdt_header.checksum =
acpi_gbl_DSDT->checksum;
}
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_copy_dsdt
*
* PARAMETERS: table_desc - Installed table to copy
*
* RETURN: None
*
* DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
* Some very bad BIOSs are known to either corrupt the DSDT or
* install a new, bad DSDT. This copy works around the problem.
*
******************************************************************************/
struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
{
struct acpi_table_header *new_table;
struct acpi_table_desc *table_desc;
table_desc = &acpi_gbl_root_table_list.tables[table_index];
new_table = ACPI_ALLOCATE(table_desc->length);
if (!new_table) {
ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
table_desc->length));
return (NULL);
}
ACPI_MEMCPY(new_table, table_desc->pointer, table_desc->length);
acpi_tb_delete_table(table_desc);
table_desc->pointer = new_table;
table_desc->flags = ACPI_TABLE_ORIGIN_ALLOCATED;
ACPI_INFO((AE_INFO,
"Forced DSDT copy: length 0x%05X copied locally, original unmapped",
new_table->length));
return (new_table);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_install_table
*
* PARAMETERS: address - Physical address of DSDT or FACS
* 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. The
* table override mechanism is called to allow the host
* OS to replace any table before it is installed in the root
* table array.
*
******************************************************************************/
void
acpi_tb_install_table(acpi_physical_address address,
char *signature, u32 table_index)
{
struct acpi_table_header *table;
struct acpi_table_header *final_table;
struct acpi_table_desc *table_desc;
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) {
ACPI_ERROR((AE_INFO,
"Could not map memory for table [%s] at %p",
signature, ACPI_CAST_PTR(void, address)));
return;
}
/* If a particular signature is expected (DSDT/FACS), it must match */
if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
ACPI_BIOS_ERROR((AE_INFO,
"Invalid signature 0x%X for ACPI table, expected [%s]",
*ACPI_CAST_PTR(u32, table->signature),
signature));
goto unmap_and_exit;
}
/*
* Initialize the table entry. Set the pointer to NULL, since the
* table is not fully mapped at this time.
*/
table_desc = &acpi_gbl_root_table_list.tables[table_index];
table_desc->address = address;
table_desc->pointer = NULL;
table_desc->length = table->length;
table_desc->flags = ACPI_TABLE_ORIGIN_MAPPED;
ACPI_MOVE_32_TO_32(table_desc->signature.ascii, table->signature);
/*
* ACPI Table Override:
*
* Before we install the table, let the host OS override it with a new
* one if desired. Any table within the RSDT/XSDT can be replaced,
* including the DSDT which is pointed to by the FADT.
*
* NOTE: If the table is overridden, then final_table will contain a
* mapped pointer to the full new table. If the table is not overridden,
* or if there has been a physical override, then the table will be
* fully mapped later (in verify table). In any case, we must
* unmap the header that was mapped above.
*/
final_table = acpi_tb_table_override(table, table_desc);
if (!final_table) {
final_table = table; /* There was no override */
}
acpi_tb_print_table_header(table_desc->address, final_table);
/* Set the global integer width (based upon revision of the DSDT) */
if (table_index == ACPI_TABLE_INDEX_DSDT) {
acpi_ut_set_integer_width(final_table->revision);
}
/*
* If we have a physical override during this early loa
|