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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: tbinstal - ACPI table installation and removal
*
* Copyright (C) 2000 - 2022, Intel Corp.
*
*****************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "actables.h"
#define _COMPONENT ACPI_TABLES
ACPI_MODULE_NAME("tbinstal")
/*******************************************************************************
*
* 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_standard_table
*
* PARAMETERS: address - Address of the table (might be a virtual
* address depending on the table_flags)
* flags - Flags for the table
* table - Pointer to the table (required for virtual
* origins, optional for physical)
* 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 verify and install an ACPI table.
* When this function is called by "Load" or "LoadTable" opcodes,
* or by acpi_load_table() API, the "Reload" parameter is set.
* After successfully returning from this function, table is
* "INSTALLED" but not "VALIDATED".
*
******************************************************************************/
acpi_status
acpi_tb_install_standard_table(acpi_physical_address address,
u8 flags,
struct acpi_table_header *table,
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, table);
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_NAMESEG(&new_table_desc.signature, ACPI_SIG_SSDT)) {
ACPI_INFO(("Ignoring installation of %4.4s at %8.8X%8.8X",
new_table_desc.signature.ascii,
ACPI_FORMAT_UINT64(address)));
goto release_and_exit;
}
/* Acquire the table lock */
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
/* Validate and verify a table before installation */
status = acpi_tb_verify_temp_table(&new_table_desc, NULL, &i);
if (ACPI_FAILURE(status)) {
if (status == AE_CTRL_TERMINATE) {
/*
* 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);
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
*table_index = i;
return_ACPI_STATUS(AE_OK);
}
goto unlock_and_exit;
}
/* Add the table to the global root table list */
acpi_tb_install_table_with_override(&new_table_desc, override,
table_index);
/* Invoke table handler */
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
acpi_tb_notify_table(ACPI_TABLE_EVENT_INSTALL, new_table_desc.pointer);
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
unlock_and_exit:
/* Release the table lock */
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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;
struct acpi_table_desc new_table_desc;
struct acpi_table_header *table;
acpi_physical_address address;
u32 length;
ACPI_ERROR_ONLY(char *override_type);
/* (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,
table);
ACPI_ERROR_ONLY(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,
NULL);
ACPI_ERROR_ONLY(override_type = "Physical");
goto finish_override;
}
return; /* There was no override */
finish_override:
/*
* Validate and verify a table before overriding, no nested table
* duplication check as it's too complicated and unnecessary.
*/
status = acpi_tb_verify_temp_table(&new_table_desc, NULL, NULL);
if (ACPI_FAILURE(status)) {
return;
}
ACPI_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(table_desc->pointer);
table_desc->pointer = NULL;
}
table_desc->address = ACPI_PTR_TO_PHYSADDR(NULL);
return_VOID;
}
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