531 lines
15 KiB
C
531 lines
15 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: tbxface - ACPI table-oriented external interfaces
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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*****************************************************************************/
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#define EXPORT_ACPI_INTERFACES
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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("tbxface")
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/*******************************************************************************
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*
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* FUNCTION: acpi_allocate_root_table
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*
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* PARAMETERS: initial_table_count - Size of initial_table_array, in number of
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* struct acpi_table_desc structures
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*
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* RETURN: Status
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*
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* DESCRIPTION: Allocate a root table array. Used by iASL compiler and
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* acpi_initialize_tables.
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*
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******************************************************************************/
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acpi_status acpi_allocate_root_table(u32 initial_table_count)
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{
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acpi_gbl_root_table_list.max_table_count = initial_table_count;
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acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
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return (acpi_tb_resize_root_table_list());
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_initialize_tables
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*
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* PARAMETERS: initial_table_array - Pointer to an array of pre-allocated
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* struct acpi_table_desc structures. If NULL, the
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* array is dynamically allocated.
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* initial_table_count - Size of initial_table_array, in number of
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* struct acpi_table_desc structures
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* allow_resize - Flag to tell Table Manager if resize of
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* pre-allocated array is allowed. Ignored
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* if initial_table_array is NULL.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
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*
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* NOTE: Allows static allocation of the initial table array in order
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* to avoid the use of dynamic memory in confined environments
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* such as the kernel boot sequence where it may not be available.
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*
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* If the host OS memory managers are initialized, use NULL for
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* initial_table_array, and the table will be dynamically allocated.
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*
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******************************************************************************/
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acpi_status ACPI_INIT_FUNCTION
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acpi_initialize_tables(struct acpi_table_desc *initial_table_array,
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u32 initial_table_count, u8 allow_resize)
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{
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acpi_physical_address rsdp_address;
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acpi_status status;
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ACPI_FUNCTION_TRACE(acpi_initialize_tables);
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/*
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* Setup the Root Table Array and allocate the table array
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* if requested
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*/
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if (!initial_table_array) {
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status = acpi_allocate_root_table(initial_table_count);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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} else {
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/* Root Table Array has been statically allocated by the host */
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memset(initial_table_array, 0,
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(acpi_size)initial_table_count *
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sizeof(struct acpi_table_desc));
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acpi_gbl_root_table_list.tables = initial_table_array;
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acpi_gbl_root_table_list.max_table_count = initial_table_count;
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acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
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if (allow_resize) {
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acpi_gbl_root_table_list.flags |=
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ACPI_ROOT_ALLOW_RESIZE;
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}
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}
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/* Get the address of the RSDP */
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rsdp_address = acpi_os_get_root_pointer();
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if (!rsdp_address) {
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return_ACPI_STATUS(AE_NOT_FOUND);
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}
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/*
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* Get the root table (RSDT or XSDT) and extract all entries to the local
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* Root Table Array. This array contains the information of the RSDT/XSDT
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* in a common, more usable format.
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*/
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status = acpi_tb_parse_root_table(rsdp_address);
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_tables)
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/*******************************************************************************
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*
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* FUNCTION: acpi_reallocate_root_table
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
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* root list from the previously provided scratch area. Should
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* be called once dynamic memory allocation is available in the
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* kernel.
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*
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******************************************************************************/
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acpi_status ACPI_INIT_FUNCTION acpi_reallocate_root_table(void)
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{
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acpi_status status;
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struct acpi_table_desc *table_desc;
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u32 i, j;
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ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
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/*
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* If there are tables unverified, it is required to reallocate the
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* root table list to clean up invalid table entries. Otherwise only
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* reallocate the root table list if the host provided a static buffer
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* for the table array in the call to acpi_initialize_tables().
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*/
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if ((acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) &&
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acpi_gbl_enable_table_validation) {
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return_ACPI_STATUS(AE_SUPPORT);
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}
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(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
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/*
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* Ensure OS early boot logic, which is required by some hosts. If the
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* table state is reported to be wrong, developers should fix the
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* issue by invoking acpi_put_table() for the reported table during the
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* early stage.
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*/
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for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
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table_desc = &acpi_gbl_root_table_list.tables[i];
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if (table_desc->pointer) {
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ACPI_ERROR((AE_INFO,
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"Table [%4.4s] is not invalidated during early boot stage",
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table_desc->signature.ascii));
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}
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}
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if (!acpi_gbl_enable_table_validation) {
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/*
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* Now it's safe to do full table validation. We can do deferred
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* table initialization here once the flag is set.
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*/
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acpi_gbl_enable_table_validation = TRUE;
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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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table_desc = &acpi_gbl_root_table_list.tables[i];
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if (!(table_desc->flags & ACPI_TABLE_IS_VERIFIED)) {
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status =
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acpi_tb_verify_temp_table(table_desc, NULL,
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&j);
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if (ACPI_FAILURE(status)) {
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acpi_tb_uninstall_table(table_desc);
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}
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}
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}
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}
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acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE;
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status = acpi_tb_resize_root_table_list();
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acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
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(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL_INIT(acpi_reallocate_root_table)
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_table_header
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*
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* PARAMETERS: signature - ACPI signature of needed table
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* instance - Which instance (for SSDTs)
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* out_table_header - The pointer to the where the table header
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* is returned
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*
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* RETURN: Status and a copy of the table header
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*
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* DESCRIPTION: Finds and returns an ACPI table header. Caller provides the
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* memory where a copy of the header is to be returned
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* (fixed length).
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*
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******************************************************************************/
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acpi_status
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acpi_get_table_header(char *signature,
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u32 instance, struct acpi_table_header *out_table_header)
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{
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u32 i;
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u32 j;
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struct acpi_table_header *header;
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/* Parameter validation */
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if (!signature || !out_table_header) {
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return (AE_BAD_PARAMETER);
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}
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/* Walk the root table list */
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for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
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i++) {
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if (!ACPI_COMPARE_NAMESEG
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(&(acpi_gbl_root_table_list.tables[i].signature),
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signature)) {
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continue;
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}
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if (++j < instance) {
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continue;
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}
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if (!acpi_gbl_root_table_list.tables[i].pointer) {
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if ((acpi_gbl_root_table_list.tables[i].flags &
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ACPI_TABLE_ORIGIN_MASK) ==
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ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL) {
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header =
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acpi_os_map_memory(acpi_gbl_root_table_list.
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tables[i].address,
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sizeof(struct
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acpi_table_header));
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if (!header) {
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return (AE_NO_MEMORY);
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}
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memcpy(out_table_header, header,
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sizeof(struct acpi_table_header));
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acpi_os_unmap_memory(header,
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sizeof(struct
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acpi_table_header));
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} else {
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return (AE_NOT_FOUND);
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}
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} else {
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memcpy(out_table_header,
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acpi_gbl_root_table_list.tables[i].pointer,
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sizeof(struct acpi_table_header));
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}
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return (AE_OK);
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}
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return (AE_NOT_FOUND);
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}
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ACPI_EXPORT_SYMBOL(acpi_get_table_header)
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_table
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*
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* PARAMETERS: signature - ACPI signature of needed table
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* instance - Which instance (for SSDTs)
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* out_table - Where the pointer to the table is returned
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*
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* RETURN: Status and pointer to the requested table
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*
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* DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
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* RSDT/XSDT.
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* Note that an early stage acpi_get_table() call must be paired
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* with an early stage acpi_put_table() call. otherwise the table
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* pointer mapped by the early stage mapping implementation may be
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* erroneously unmapped by the late stage unmapping implementation
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* in an acpi_put_table() invoked during the late stage.
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*
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******************************************************************************/
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acpi_status
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acpi_get_table(char *signature,
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u32 instance, struct acpi_table_header ** out_table)
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{
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u32 i;
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u32 j;
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acpi_status status = AE_NOT_FOUND;
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struct acpi_table_desc *table_desc;
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/* Parameter validation */
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if (!signature || !out_table) {
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return (AE_BAD_PARAMETER);
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}
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/*
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* Note that the following line is required by some OSPMs, they only
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* check if the returned table is NULL instead of the returned status
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* to determined if this function is succeeded.
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*/
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*out_table = NULL;
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(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
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/* Walk the root table list */
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for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
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i++) {
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table_desc = &acpi_gbl_root_table_list.tables[i];
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if (!ACPI_COMPARE_NAMESEG(&table_desc->signature, signature)) {
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continue;
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}
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if (++j < instance) {
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continue;
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}
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status = acpi_tb_get_table(table_desc, out_table);
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break;
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}
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(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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return (status);
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}
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ACPI_EXPORT_SYMBOL(acpi_get_table)
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/*******************************************************************************
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*
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* FUNCTION: acpi_put_table
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*
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* PARAMETERS: table - The pointer to the table
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*
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* RETURN: None
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*
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* DESCRIPTION: Release a table returned by acpi_get_table() and its clones.
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* Note that it is not safe if this function was invoked after an
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* uninstallation happened to the original table descriptor.
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* Currently there is no OSPMs' requirement to handle such
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* situations.
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*
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******************************************************************************/
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void acpi_put_table(struct acpi_table_header *table)
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{
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u32 i;
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struct acpi_table_desc *table_desc;
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ACPI_FUNCTION_TRACE(acpi_put_table);
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if (!table) {
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return_VOID;
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}
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(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
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/* Walk the root table list */
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for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
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table_desc = &acpi_gbl_root_table_list.tables[i];
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if (table_desc->pointer != table) {
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continue;
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}
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acpi_tb_put_table(table_desc);
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break;
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}
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(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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return_VOID;
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}
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ACPI_EXPORT_SYMBOL(acpi_put_table)
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_table_by_index
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*
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* PARAMETERS: table_index - Table index
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* out_table - Where the pointer to the table is returned
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*
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* RETURN: Status and pointer to the requested table
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*
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* DESCRIPTION: Obtain a table by an index into the global table list. Used
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* internally also.
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*
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******************************************************************************/
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acpi_status
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acpi_get_table_by_index(u32 table_index, struct acpi_table_header **out_table)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
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/* Parameter validation */
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if (!out_table) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/*
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* Note that the following line is required by some OSPMs, they only
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* check if the returned table is NULL instead of the returned status
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* to determined if this function is succeeded.
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*/
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*out_table = NULL;
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(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
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/* Validate index */
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if (table_index >= acpi_gbl_root_table_list.current_table_count) {
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status = AE_BAD_PARAMETER;
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goto unlock_and_exit;
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}
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status =
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acpi_tb_get_table(&acpi_gbl_root_table_list.tables[table_index],
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out_table);
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unlock_and_exit:
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(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
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/*******************************************************************************
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*
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* FUNCTION: acpi_install_table_handler
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*
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* PARAMETERS: handler - Table event handler
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* context - Value passed to the handler on each event
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*
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* RETURN: Status
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*
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* DESCRIPTION: Install a global table event handler.
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*
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******************************************************************************/
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acpi_status
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acpi_install_table_handler(acpi_table_handler handler, void *context)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(acpi_install_table_handler);
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if (!handler) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Don't allow more than one handler */
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if (acpi_gbl_table_handler) {
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status = AE_ALREADY_EXISTS;
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goto cleanup;
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}
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/* Install the handler */
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acpi_gbl_table_handler = handler;
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acpi_gbl_table_handler_context = context;
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cleanup:
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(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
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/*******************************************************************************
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*
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* FUNCTION: acpi_remove_table_handler
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*
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* PARAMETERS: handler - Table event handler that was installed
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* previously.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Remove a table event handler
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*
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******************************************************************************/
|
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acpi_status acpi_remove_table_handler(acpi_table_handler handler)
|
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
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status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Make sure that the installed handler is the same */
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if (!handler || handler != acpi_gbl_table_handler) {
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status = AE_BAD_PARAMETER;
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goto cleanup;
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}
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|
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/* Remove the handler */
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acpi_gbl_table_handler = NULL;
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cleanup:
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(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
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return_ACPI_STATUS(status);
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}
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|
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ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
|