/******************************************************************************
*
* Module Name: tbinstal - ACPI table installation and removal
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2015, 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("tbinstal")
/* Local prototypes */
static u8
acpi_tb_compare_tables(struct acpi_table_desc *table_desc, u32 table_index);
/*******************************************************************************
*
* FUNCTION: acpi_tb_compare_tables
*
* PARAMETERS: table_desc - Table 1 descriptor to be compared
* table_index - Index of table 2 to be compared
*
* RETURN: TRUE if both tables are identical.
*
* DESCRIPTION: This function compares a table with another table that has
* already been installed in the root table list.
*
******************************************************************************/
static u8
acpi_tb_compare_tables(struct acpi_table_desc *table_desc, u32 table_index)
{
acpi_status status = AE_OK;
u8 is_identical;
struct acpi_table_header *table;
u32 table_length;
u8 table_flags;
status =
acpi_tb_acquire_table(&acpi_gbl_root_table_list.tables[table_index],
&table, &table_length, &table_flags);
if (ACPI_FAILURE(status)) {
return (FALSE);
}
/*
* Check for a table match on the entire table length,
* not just the header.
*/
is_identical = (u8)((table_desc->length != table_length ||
memcmp(table_desc->pointer, table, table_length)) ?
FALSE : TRUE);
/* Release the acquired table */
acpi_tb_release_table(table, table_length, table_flags);
return (is_identical);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_install_table_with_override
*
* PARAMETERS: new_table_desc - New table descriptor to install
* override - Whether override should be performed
* table_index - Where the table index is returned
*
* 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_with_override(struct acpi_table_desc *new_table_desc,
u8 override, u32 *table_index)
{
u32 i;
acpi_status status;
status = acpi_tb_get_next_table_descriptor(&i, NULL);
if (ACPI_FAILURE(status)) {
return;
}
/*
* 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.
*/
if (override) {
acpi_tb_override_table(new_table_desc);
}
acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.tables[i],
new_table_desc->address,
new_table_desc->flags,
new_table_desc->pointer);
acpi_tb_print_table_header(new_table_desc->address,
new_table_desc->pointer);
/* This synchronizes acpi_gbl_dsdt_index */
*table_index = i;
/* Set the global integer width (based upon revision of the DSDT) */
if (i == acpi_gbl_dsdt_index) {
acpi_ut_set_integer_width(new_table_desc->pointer->revision);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_install_fixed_table
*
* PARAMETERS: address - Physical address of DSDT or FACS
* signature - Table signature, NULL if no need to
* match
* table_index - Where the table index is returned
*
* RETURN: Status
*
* DESCRIPTION: Install a fixed ACPI table (DSDT/FACS) into the global data
* structure.
*
******************************************************************************/
acpi_status
acpi_tb_install_fixed_table(acpi_physical_address address,
char *signature, u32 *table_index)
{
struct acpi_table_desc new_table_desc;
acpi_status status;
ACPI_FUNCTION_TRACE(tb_install_fixed_table);
if (!address) {
ACPI_ERROR((AE_INFO,
"Null physical address for ACPI table [%s]",
signature));
return (AE_NO_MEMORY);
}
/* Fill a table descriptor for validation */
status = acpi_tb_acquire_temp_table(&new_table_desc, address,
ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO,
"Could not acquire table length at %8.8X%8.8X",
ACPI_FORMAT_UINT64(address)));
return_ACPI_STATUS(status);
}
/* Validate and verify a table before installation */
status = acpi_tb_verify_temp_table(&new_table_desc, signature);
if (ACPI_FAILURE(status)) {
goto release_and_exit;
}
/* Add the table to the global root table list */
acpi_tb_install_table_with_override(&new_table_desc, TRUE, table_index);
release_and_exit:
/* Release the temporary table descriptor */
acpi_tb_release_temp_table(&new_table_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_install_standard_table
*
* PARAMETERS: address - Address of the table (might be a virtual
* address depending on the table_flags)
* flags - Flags for the table
* reload - Whether reload should be performed
* override - Whether override should be performed
* table_index - Where the table index is returned
*
* RETURN: Status
*
* DESCRIPTION: This function is called to install an ACPI table that is
* neither DSDT nor FACS (a "standard" table.)
* When this function is called by "Load" or "LoadTable" opcodes,
* or by acpi_load_table() API, the "Reload" parameter is set.
* After sucessfully returning from this function, table is
* "INSTALLED" but not "VALIDATED".
*
******************************************************************************/
acpi_status
acpi_tb_install_standard_table(acpi_physical_address address,
u8 flags,
u8 reload, u8 override, u32 *table_index)
{
u32 i;
acpi_status status = AE_OK;
struct acpi_table_desc new_table_desc;
ACPI_FUNCTION_TRACE(tb_install_standard_table);
/* Acquire a temporary table descriptor for validation */
status = acpi_tb_acquire_temp_table(&new_table_desc, address, flags);
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO,
"Could not acquire table length at %8.8X%8.8X",
ACPI_FORMAT_UINT64(address)));
return_ACPI_STATUS(status);
}
/*
* Optionally do not load any SSDTs from the RSDT/XSDT. This can
* be useful for debugging ACPI problems on some machines.
*/
if (!reload &&
acpi_gbl_disable_ssdt_table_install &&
ACPI_COMPARE_NAME(&new_table_desc.signature, ACPI_SIG_SSDT)) {
ACPI_INFO((AE_INFO,
"Ignoring installation of %4.4s at %8.8X%8.8X",
new_table_desc.signature.ascii,
ACPI_FORMAT_UINT64(address)));
goto release_and_exit;
}
/* Validate and verify a table before installation */
status = acpi_tb_verify_temp_table(&new_table_desc, NULL);
if (ACPI_FAILURE(status)) {
goto release_and_exit;
}
if (reload) {
/*
* Validate the incoming table signature.
*
* 1) Originally, we checked the table signature for "SSDT" or "PSDT".
* 2) We added support for OEMx tables, signature "OEM".
* 3) Valid tables were encountered with a null signature, so we just
* gave up on validating the signature, (05/2008).
* 4) We encountered non-AML tables such as the MADT, which caused
* interpreter errors and kernel faults. So now, we once again allow
* only "SSDT", "OEMx", and now, also a null signature. (05/2011).
*/
if ((new_table_desc.signature.ascii[0] != 0x00) &&
(!ACPI_COMPARE_NAME
(&new_table_desc.signature, ACPI_SIG_SSDT))
&& (strncmp(new_table_desc.signature.ascii, "OEM", 3))) {
ACPI_BIOS_ERROR((AE_INFO,
"Table has invalid signature [%4.4s] (0x%8.8X), "
"must be SSDT or OEMx",
acpi_ut_valid_acpi_name(new_table_desc.
signature.
ascii) ?
new_table_desc.signature.
ascii : "????",
new_table_desc.signature.integer));
status = AE_BAD_SIGNATURE;
goto release_and_exit;
}
/* Check if table is already registered */
for (i = 0; i < acpi_gbl_root_table_list.current_table_count;
++i) {
/*
* Check for a table match on the entire table length,
* not just the header.
*/
if (!acpi_tb_compare_tables(&new_table_desc, i)) {
continue;
}
/*
* Note: the current mechanism does not unregister a table if it is
* dynamically unloaded. The related namespace entries are deleted,
* but the table remains in the root table list.
*
* The assumption here is that the number of different tables that
* will be loaded is actually small, and there is minimal overhead
* in just keeping the table in case it is needed again.
*
* If this assumption changes in the future (perhaps on large
* machines with many table load/unload operations), tables will
* need to be unregistered when they are unloaded, and slots in the
* root table list should be reused when empty.
*/
if (acpi_gbl_root_table_list.tables[i].
flags & ACPI_TABLE_IS_LOADED) {
/* Table is still loaded, this is an error */
status = AE_ALREADY_EXISTS;
goto release_and_exit;
} else {
/*
* Table was unloaded, allow it to be reloaded.
* As we are going to return AE_OK to the caller, we should
* take the responsibility of freeing the input descriptor.
* Refill the input descriptor to ensure
* acpi_tb_install_table_with_override() can be called again to
* indicate the re-installation.
*/
acpi_tb_uninstall_table(&new_table_desc);
*table_index = i;
return_ACPI_STATUS(AE_OK);
}
}
}
/* Add the table to the global root table list */
acpi_tb_install_table_with_override(&new_table_desc, override,
table_index);
release_and_exit:
/* Release the temporary table descriptor */
acpi_tb_release_temp_table(&new_table_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_override_table
*
* PARAMETERS: old_table_desc - Validated table descriptor to be
* overridden
*
* RETURN: None
*
* DESCRIPTION: Attempt table override by calling the OSL override functions.
* Note: If the table is overridden, then the entire new table
* is acquired and returned by this function.
* Before/after invocation, the table descriptor is in a state
* that is "VALIDATED".
*
******************************************************************************/
void acpi_tb_override_table(struct acpi_table_desc *old_table_desc)
{
acpi_status status;
char *override_type;
struct acpi_table_desc new_table_desc;
struct acpi_table_header *table;
acpi_physical_address address;
u32 length;
/* (1) Attempt logical override (returns a logical address) */
status = acpi_os_table_override(old_table_desc->pointer, &table);
if (ACPI_SUCCESS(status) && table) {
acpi_tb_acquire_temp_table(&new_table_desc,
ACPI_PTR_TO_PHYSADDR(table),
ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL);
override_type = "Logical";
goto finish_override;
}
/* (2) Attempt physical override (returns a physical address) */
status = acpi_os_physical_table_override(old_table_desc->pointer,
&address, &length);
if (ACPI_SUCCESS(status) && address && length) {
acpi_tb_acquire_temp_table(&new_table_desc, address,
ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
override_type = "Physical";
goto finish_override;
}
return; /* There was no override */
finish_override:
/* Validate and verify a table before overriding */
status = acpi_tb_verify_temp_table(&new_table_desc, NULL);
if (ACPI_FAILURE(status)) {
return;
}
ACPI_INFO((AE_INFO, "%4.4s 0x%8.8X%8.8X"
" %s table override, new table: 0x%8.8X%8.8X",
old_table_desc->signature.ascii,
ACPI_FORMAT_UINT64(old_table_desc->address),
override_type, ACPI_FORMAT_UINT64(new_table_desc.address)));
/* We can now uninstall the original table */
acpi_tb_uninstall_table(old_table_desc);
/*
* Replace the original table descriptor and keep its state as
* "VALIDATED".
*/
acpi_tb_init_table_descriptor(old_table_desc, new_table_desc.address,
new_table_desc.flags,
new_table_desc.pointer);
acpi_tb_validate_temp_table(old_table_desc);
/* Release the temporary table descriptor */
acpi_tb_release_temp_table(&new_table_desc);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_uninstall_table
*
* PARAMETERS: table_desc - Table descriptor
*
* RETURN: None
*
* DESCRIPTION: Delete one internal ACPI table
*
******************************************************************************/
void acpi_tb_uninstall_table(struct acpi_table_desc *table_desc)
{
ACPI_FUNCTION_TRACE(tb_uninstall_table);
/* Table must be installed */
if (!table_desc->address) {
return_VOID;
}
acpi_tb_invalidate_table(table_desc);
if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL) {
ACPI_FREE(ACPI_PHYSADDR_TO_PTR(table_desc->address));
}
table_desc->address = ACPI_PTR_TO_PHYSADDR(NULL);
return_VOID;
}