436 lines
14 KiB
C
436 lines
14 KiB
C
/******************************************************************************
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*
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* Module Name: tbinstal - ACPI table installation and removal
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2016, Intel Corp.
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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 "accommon.h"
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#include "actables.h"
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME("tbinstal")
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/* Local prototypes */
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static u8
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acpi_tb_compare_tables(struct acpi_table_desc *table_desc, u32 table_index);
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_compare_tables
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*
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* PARAMETERS: table_desc - Table 1 descriptor to be compared
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* table_index - Index of table 2 to be compared
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*
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* RETURN: TRUE if both tables are identical.
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*
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* DESCRIPTION: This function compares a table with another table that has
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* already been installed in the root table list.
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*
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******************************************************************************/
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static u8
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acpi_tb_compare_tables(struct acpi_table_desc *table_desc, u32 table_index)
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{
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acpi_status status = AE_OK;
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u8 is_identical;
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struct acpi_table_header *table;
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u32 table_length;
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u8 table_flags;
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status =
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acpi_tb_acquire_table(&acpi_gbl_root_table_list.tables[table_index],
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&table, &table_length, &table_flags);
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if (ACPI_FAILURE(status)) {
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return (FALSE);
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}
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/*
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* Check for a table match on the entire table length,
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* not just the header.
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*/
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is_identical = (u8)((table_desc->length != table_length ||
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memcmp(table_desc->pointer, table, table_length)) ?
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FALSE : TRUE);
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/* Release the acquired table */
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acpi_tb_release_table(table, table_length, table_flags);
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return (is_identical);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_install_table_with_override
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*
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* PARAMETERS: new_table_desc - New table descriptor to install
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* override - Whether override should be performed
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* table_index - Where the table index is returned
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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. The
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* table override mechanism is called to allow the host
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* OS to replace any table before it is installed in the root
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* table array.
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*
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******************************************************************************/
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void
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acpi_tb_install_table_with_override(struct acpi_table_desc *new_table_desc,
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u8 override, u32 *table_index)
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{
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u32 i;
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acpi_status status;
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status = acpi_tb_get_next_table_descriptor(&i, NULL);
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if (ACPI_FAILURE(status)) {
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return;
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}
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/*
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* ACPI Table Override:
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*
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* Before we install the table, let the host OS override it with a new
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* one if desired. Any table within the RSDT/XSDT can be replaced,
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* including the DSDT which is pointed to by the FADT.
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*/
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if (override) {
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acpi_tb_override_table(new_table_desc);
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}
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acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.tables[i],
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new_table_desc->address,
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new_table_desc->flags,
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new_table_desc->pointer);
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acpi_tb_print_table_header(new_table_desc->address,
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new_table_desc->pointer);
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/* This synchronizes acpi_gbl_dsdt_index */
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*table_index = i;
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/* Set the global integer width (based upon revision of the DSDT) */
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if (i == acpi_gbl_dsdt_index) {
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acpi_ut_set_integer_width(new_table_desc->pointer->revision);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_install_standard_table
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*
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* PARAMETERS: address - Address of the table (might be a virtual
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* address depending on the table_flags)
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* flags - Flags for the table
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* reload - Whether reload should be performed
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* override - Whether override should be performed
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* table_index - Where the table index is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: This function is called to verify and install an ACPI table.
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* When this function is called by "Load" or "LoadTable" opcodes,
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* or by acpi_load_table() API, the "Reload" parameter is set.
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* After sucessfully returning from this function, table is
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* "INSTALLED" but not "VALIDATED".
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*
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******************************************************************************/
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acpi_status
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acpi_tb_install_standard_table(acpi_physical_address address,
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u8 flags,
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u8 reload, u8 override, u32 *table_index)
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{
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u32 i;
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acpi_status status = AE_OK;
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struct acpi_table_desc new_table_desc;
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ACPI_FUNCTION_TRACE(tb_install_standard_table);
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/* Acquire a temporary table descriptor for validation */
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status = acpi_tb_acquire_temp_table(&new_table_desc, address, flags);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO,
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"Could not acquire table length at %8.8X%8.8X",
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ACPI_FORMAT_UINT64(address)));
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return_ACPI_STATUS(status);
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}
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/*
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* Optionally do not load any SSDTs from the RSDT/XSDT. This can
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* be useful for debugging ACPI problems on some machines.
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*/
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if (!reload &&
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acpi_gbl_disable_ssdt_table_install &&
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ACPI_COMPARE_NAME(&new_table_desc.signature, ACPI_SIG_SSDT)) {
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ACPI_INFO(("Ignoring installation of %4.4s at %8.8X%8.8X",
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new_table_desc.signature.ascii,
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ACPI_FORMAT_UINT64(address)));
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goto release_and_exit;
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}
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/* Validate and verify a table before installation */
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status = acpi_tb_verify_temp_table(&new_table_desc, NULL);
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if (ACPI_FAILURE(status)) {
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goto release_and_exit;
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}
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if (reload) {
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/*
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* Validate the incoming table signature.
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*
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* 1) Originally, we checked the table signature for "SSDT" or "PSDT".
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* 2) We added support for OEMx tables, signature "OEM".
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* 3) Valid tables were encountered with a null signature, so we just
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* gave up on validating the signature, (05/2008).
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* 4) We encountered non-AML tables such as the MADT, which caused
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* interpreter errors and kernel faults. So now, we once again allow
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* only "SSDT", "OEMx", and now, also a null signature. (05/2011).
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*/
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if ((new_table_desc.signature.ascii[0] != 0x00) &&
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(!ACPI_COMPARE_NAME
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(&new_table_desc.signature, ACPI_SIG_SSDT))
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&& (strncmp(new_table_desc.signature.ascii, "OEM", 3))) {
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ACPI_BIOS_ERROR((AE_INFO,
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"Table has invalid signature [%4.4s] (0x%8.8X), "
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"must be SSDT or OEMx",
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acpi_ut_valid_nameseg(new_table_desc.
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signature.
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ascii) ?
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new_table_desc.signature.
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ascii : "????",
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new_table_desc.signature.integer));
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status = AE_BAD_SIGNATURE;
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goto release_and_exit;
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}
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/* Check if table is already registered */
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for (i = 0; i < acpi_gbl_root_table_list.current_table_count;
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++i) {
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/*
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* Check for a table match on the entire table length,
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* not just the header.
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*/
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if (!acpi_tb_compare_tables(&new_table_desc, i)) {
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continue;
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}
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/*
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* Note: the current mechanism does not unregister a table if it is
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* dynamically unloaded. The related namespace entries are deleted,
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* but the table remains in the root table list.
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*
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* The assumption here is that the number of different tables that
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* will be loaded is actually small, and there is minimal overhead
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* in just keeping the table in case it is needed again.
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*
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* If this assumption changes in the future (perhaps on large
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* machines with many table load/unload operations), tables will
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* need to be unregistered when they are unloaded, and slots in the
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* root table list should be reused when empty.
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*/
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if (acpi_gbl_root_table_list.tables[i].flags &
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ACPI_TABLE_IS_LOADED) {
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/* Table is still loaded, this is an error */
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status = AE_ALREADY_EXISTS;
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goto release_and_exit;
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} else {
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/*
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* Table was unloaded, allow it to be reloaded.
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* As we are going to return AE_OK to the caller, we should
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* take the responsibility of freeing the input descriptor.
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* Refill the input descriptor to ensure
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* acpi_tb_install_table_with_override() can be called again to
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* indicate the re-installation.
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*/
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acpi_tb_uninstall_table(&new_table_desc);
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*table_index = i;
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return_ACPI_STATUS(AE_OK);
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}
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}
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}
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/* Add the table to the global root table list */
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acpi_tb_install_table_with_override(&new_table_desc, override,
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table_index);
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/* Invoke table handler if present */
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if (acpi_gbl_table_handler) {
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(void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_INSTALL,
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new_table_desc.pointer,
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acpi_gbl_table_handler_context);
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}
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release_and_exit:
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/* Release the temporary table descriptor */
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acpi_tb_release_temp_table(&new_table_desc);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_override_table
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*
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* PARAMETERS: old_table_desc - Validated table descriptor to be
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* overridden
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*
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* RETURN: None
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*
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* DESCRIPTION: Attempt table override by calling the OSL override functions.
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* Note: If the table is overridden, then the entire new table
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* is acquired and returned by this function.
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* Before/after invocation, the table descriptor is in a state
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* that is "VALIDATED".
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*
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******************************************************************************/
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void acpi_tb_override_table(struct acpi_table_desc *old_table_desc)
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{
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acpi_status status;
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char *override_type;
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struct acpi_table_desc new_table_desc;
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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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/* (1) Attempt logical override (returns a logical address) */
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status = acpi_os_table_override(old_table_desc->pointer, &table);
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if (ACPI_SUCCESS(status) && table) {
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acpi_tb_acquire_temp_table(&new_table_desc,
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ACPI_PTR_TO_PHYSADDR(table),
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ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL);
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override_type = "Logical";
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goto finish_override;
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}
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/* (2) Attempt physical override (returns a physical address) */
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status = acpi_os_physical_table_override(old_table_desc->pointer,
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&address, &length);
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if (ACPI_SUCCESS(status) && address && length) {
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acpi_tb_acquire_temp_table(&new_table_desc, address,
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ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
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override_type = "Physical";
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goto finish_override;
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}
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return; /* There was no override */
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finish_override:
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/* Validate and verify a table before overriding */
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status = acpi_tb_verify_temp_table(&new_table_desc, NULL);
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if (ACPI_FAILURE(status)) {
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return;
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}
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ACPI_INFO(("%4.4s 0x%8.8X%8.8X"
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" %s table override, new table: 0x%8.8X%8.8X",
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old_table_desc->signature.ascii,
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ACPI_FORMAT_UINT64(old_table_desc->address),
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override_type, ACPI_FORMAT_UINT64(new_table_desc.address)));
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/* We can now uninstall the original table */
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acpi_tb_uninstall_table(old_table_desc);
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/*
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* Replace the original table descriptor and keep its state as
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* "VALIDATED".
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*/
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acpi_tb_init_table_descriptor(old_table_desc, new_table_desc.address,
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new_table_desc.flags,
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new_table_desc.pointer);
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acpi_tb_validate_temp_table(old_table_desc);
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/* Release the temporary table descriptor */
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acpi_tb_release_temp_table(&new_table_desc);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_uninstall_table
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*
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* PARAMETERS: table_desc - Table descriptor
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*
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* RETURN: None
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*
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* DESCRIPTION: Delete one internal ACPI table
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*
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******************************************************************************/
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void acpi_tb_uninstall_table(struct acpi_table_desc *table_desc)
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{
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ACPI_FUNCTION_TRACE(tb_uninstall_table);
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/* Table must be installed */
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if (!table_desc->address) {
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return_VOID;
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}
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acpi_tb_invalidate_table(table_desc);
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if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
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ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL) {
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ACPI_FREE(ACPI_PHYSADDR_TO_PTR(table_desc->address));
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}
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table_desc->address = ACPI_PTR_TO_PHYSADDR(NULL);
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return_VOID;
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}
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