515 lines
15 KiB
C
515 lines
15 KiB
C
/******************************************************************************
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*
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* Module Name: tbxface - ACPI table-oriented external interfaces
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2013, 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 <linux/export.h>
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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 __init
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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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ACPI_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 useable 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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/*******************************************************************************
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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_reallocate_root_table(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
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/*
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* Only reallocate the root table 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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return_ACPI_STATUS(AE_SUPPORT);
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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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return_ACPI_STATUS(status);
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}
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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 table header to fill
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*
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* RETURN: Status and pointer to mapped table header
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*
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* DESCRIPTION: Finds an ACPI table header.
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*
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* NOTE: Caller is responsible in unmapping the header with
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* acpi_os_unmap_memory
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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_NAME
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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_MAPPED) {
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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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ACPI_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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ACPI_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_unload_table_id
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*
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* PARAMETERS: id - Owner ID of the table to be removed.
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*
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* RETURN: Status
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*
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* DESCRIPTION: This routine is used to force the unload of a table (by id)
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*
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******************************************************************************/
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acpi_status acpi_unload_table_id(acpi_owner_id id)
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{
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int i;
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acpi_status status = AE_NOT_EXIST;
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ACPI_FUNCTION_TRACE(acpi_unload_table_id);
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/* Find table in the global table list */
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for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
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if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
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continue;
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}
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/*
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* Delete all namespace objects owned by this table. Note that these
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* objects can appear anywhere in the namespace by virtue of the AML
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* "Scope" operator. Thus, we need to track ownership by an ID, not
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* simply a position within the hierarchy
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*/
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acpi_tb_delete_namespace_by_owner(i);
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status = acpi_tb_release_owner_id(i);
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acpi_tb_set_table_loaded_flag(i, FALSE);
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break;
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}
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_table_with_size
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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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*
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******************************************************************************/
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acpi_status
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acpi_get_table_with_size(char *signature,
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u32 instance, struct acpi_table_header **out_table,
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acpi_size *tbl_size)
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{
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u32 i;
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u32 j;
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acpi_status status;
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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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/* 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_NAME
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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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status =
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acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
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if (ACPI_SUCCESS(status)) {
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*out_table = acpi_gbl_root_table_list.tables[i].pointer;
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*tbl_size = acpi_gbl_root_table_list.tables[i].length;
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}
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if (!acpi_gbl_permanent_mmap) {
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acpi_gbl_root_table_list.tables[i].pointer = NULL;
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}
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return (status);
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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_with_size)
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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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acpi_size tbl_size;
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return acpi_get_table_with_size(signature,
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instance, out_table, &tbl_size);
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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_get_table_by_index
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*
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* PARAMETERS: table_index - Table index
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* 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 **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 (!table) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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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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(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
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/* Table is not mapped, map it */
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status =
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acpi_tb_verify_table(&acpi_gbl_root_table_list.
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tables[table_index]);
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if (ACPI_FAILURE(status)) {
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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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}
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*table = acpi_gbl_root_table_list.tables[table_index].pointer;
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(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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return_ACPI_STATUS(AE_OK);
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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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/* 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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ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
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