1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
607 lines
18 KiB
C
607 lines
18 KiB
C
/******************************************************************************
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*
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* Module Name: tbxfroot - Find the root ACPI table (RSDT)
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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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/module.h>
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#include <acpi/acpi.h>
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#include <acpi/actables.h>
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME ("tbxfroot")
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_find_table
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*
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* PARAMETERS: Signature - String with ACPI table signature
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* oem_id - String with the table OEM ID
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* oem_table_id - String with the OEM Table ID.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
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* Signature, OEM ID and OEM Table ID.
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*
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******************************************************************************/
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acpi_status
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acpi_tb_find_table (
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char *signature,
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char *oem_id,
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char *oem_table_id,
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struct acpi_table_header **table_ptr)
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{
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acpi_status status;
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struct acpi_table_header *table;
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ACPI_FUNCTION_TRACE ("tb_find_table");
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/* Validate string lengths */
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if ((ACPI_STRLEN (signature) > ACPI_NAME_SIZE) ||
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(ACPI_STRLEN (oem_id) > sizeof (table->oem_id)) ||
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(ACPI_STRLEN (oem_table_id) > sizeof (table->oem_table_id))) {
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return_ACPI_STATUS (AE_AML_STRING_LIMIT);
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}
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if (!ACPI_STRNCMP (signature, DSDT_SIG, ACPI_NAME_SIZE)) {
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/*
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* The DSDT pointer is contained in the FADT, not the RSDT.
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* This code should suffice, because the only code that would perform
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* a "find" on the DSDT is the data_table_region() AML opcode -- in
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* which case, the DSDT is guaranteed to be already loaded.
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* If this becomes insufficient, the FADT will have to be found first.
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*/
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if (!acpi_gbl_DSDT) {
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return_ACPI_STATUS (AE_NO_ACPI_TABLES);
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}
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table = acpi_gbl_DSDT;
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}
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else {
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/* Find the table */
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status = acpi_get_firmware_table (signature, 1,
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ACPI_LOGICAL_ADDRESSING, &table);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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}
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/* Check oem_id and oem_table_id */
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if ((oem_id[0] && ACPI_STRNCMP (
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oem_id, table->oem_id, sizeof (table->oem_id))) ||
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(oem_table_id[0] && ACPI_STRNCMP (
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oem_table_id, table->oem_table_id, sizeof (table->oem_table_id)))) {
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return_ACPI_STATUS (AE_AML_NAME_NOT_FOUND);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n", table->signature));
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*table_ptr = table;
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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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* FUNCTION: acpi_get_firmware_table
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*
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* PARAMETERS: Signature - Any ACPI table signature
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* Instance - the non zero instance of the table, allows
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* support for multiple tables of the same type
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* Flags - Physical/Virtual support
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* table_pointer - Where a buffer containing the table is
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* 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 get an ACPI table. A buffer is
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* allocated for the table and returned in table_pointer.
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* This table will be a complete table including the header.
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*
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******************************************************************************/
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acpi_status
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acpi_get_firmware_table (
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acpi_string signature,
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u32 instance,
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u32 flags,
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struct acpi_table_header **table_pointer)
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{
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acpi_status status;
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struct acpi_pointer address;
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struct acpi_table_header *header = NULL;
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struct acpi_table_desc *table_info = NULL;
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struct acpi_table_desc *rsdt_info;
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u32 table_count;
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u32 i;
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u32 j;
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ACPI_FUNCTION_TRACE ("acpi_get_firmware_table");
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/*
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* Ensure that at least the table manager is initialized. We don't
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* require that the entire ACPI subsystem is up for this interface.
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* If we have a buffer, we must have a length too
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*/
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if ((instance == 0) ||
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(!signature) ||
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(!table_pointer)) {
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/* Ensure that we have a RSDP */
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if (!acpi_gbl_RSDP) {
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/* Get the RSDP */
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status = acpi_os_get_root_pointer (flags, &address);
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if (ACPI_FAILURE (status)) {
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "RSDP not found\n"));
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return_ACPI_STATUS (AE_NO_ACPI_TABLES);
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}
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/* Map and validate the RSDP */
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if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
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status = acpi_os_map_memory (address.pointer.physical, sizeof (struct rsdp_descriptor),
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(void *) &acpi_gbl_RSDP);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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}
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else {
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acpi_gbl_RSDP = address.pointer.logical;
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}
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/* The signature and checksum must both be correct */
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if (ACPI_STRNCMP ((char *) acpi_gbl_RSDP, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
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/* Nope, BAD Signature */
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return_ACPI_STATUS (AE_BAD_SIGNATURE);
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}
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if (acpi_tb_checksum (acpi_gbl_RSDP, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
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/* Nope, BAD Checksum */
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return_ACPI_STATUS (AE_BAD_CHECKSUM);
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}
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}
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/* Get the RSDT address via the RSDP */
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acpi_tb_get_rsdt_address (&address);
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"RSDP located at %p, RSDT physical=%8.8X%8.8X \n",
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acpi_gbl_RSDP,
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ACPI_FORMAT_UINT64 (address.pointer.value)));
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/* Insert processor_mode flags */
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address.pointer_type |= flags;
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/* Get and validate the RSDT */
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rsdt_info = ACPI_MEM_CALLOCATE (sizeof (struct acpi_table_desc));
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if (!rsdt_info) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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status = acpi_tb_get_table (&address, rsdt_info);
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if (ACPI_FAILURE (status)) {
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goto cleanup;
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}
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status = acpi_tb_validate_rsdt (rsdt_info->pointer);
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if (ACPI_FAILURE (status)) {
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goto cleanup;
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}
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/* Allocate a scratch table header and table descriptor */
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header = ACPI_MEM_ALLOCATE (sizeof (struct acpi_table_header));
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if (!header) {
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status = AE_NO_MEMORY;
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goto cleanup;
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}
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table_info = ACPI_MEM_ALLOCATE (sizeof (struct acpi_table_desc));
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if (!table_info) {
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status = AE_NO_MEMORY;
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goto cleanup;
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}
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/* Get the number of table pointers within the RSDT */
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table_count = acpi_tb_get_table_count (acpi_gbl_RSDP, rsdt_info->pointer);
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address.pointer_type = acpi_gbl_table_flags | flags;
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/*
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* Search the RSDT/XSDT for the correct instance of the
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* requested table
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*/
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for (i = 0, j = 0; i < table_count; i++) {
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/* Get the next table pointer, handle RSDT vs. XSDT */
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if (acpi_gbl_RSDP->revision < 2) {
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address.pointer.value = (ACPI_CAST_PTR (
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RSDT_DESCRIPTOR, rsdt_info->pointer))->table_offset_entry[i];
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}
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else {
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address.pointer.value = (ACPI_CAST_PTR (
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XSDT_DESCRIPTOR, rsdt_info->pointer))->table_offset_entry[i];
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}
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/* Get the table header */
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status = acpi_tb_get_table_header (&address, header);
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if (ACPI_FAILURE (status)) {
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goto cleanup;
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}
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/* Compare table signatures and table instance */
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if (!ACPI_STRNCMP (header->signature, signature, ACPI_NAME_SIZE)) {
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/* An instance of the table was found */
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j++;
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if (j >= instance) {
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/* Found the correct instance, get the entire table */
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status = acpi_tb_get_table_body (&address, header, table_info);
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if (ACPI_FAILURE (status)) {
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goto cleanup;
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}
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*table_pointer = table_info->pointer;
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goto cleanup;
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}
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}
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}
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/* Did not find the table */
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status = AE_NOT_EXIST;
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cleanup:
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acpi_os_unmap_memory (rsdt_info->pointer, (acpi_size) rsdt_info->pointer->length);
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ACPI_MEM_FREE (rsdt_info);
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if (header) {
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ACPI_MEM_FREE (header);
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}
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if (table_info) {
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ACPI_MEM_FREE (table_info);
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}
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return_ACPI_STATUS (status);
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}
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EXPORT_SYMBOL(acpi_get_firmware_table);
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/* TBD: Move to a new file */
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#if ACPI_MACHINE_WIDTH != 16
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/*******************************************************************************
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*
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* FUNCTION: acpi_find_root_pointer
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*
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* PARAMETERS: **rsdp_address - Where to place the RSDP address
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* Flags - Logical/Physical addressing
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*
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* RETURN: Status, Physical address of the RSDP
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*
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* DESCRIPTION: Find the RSDP
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*
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******************************************************************************/
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acpi_status
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acpi_find_root_pointer (
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u32 flags,
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struct acpi_pointer *rsdp_address)
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{
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struct acpi_table_desc table_info;
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acpi_status status;
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ACPI_FUNCTION_TRACE ("acpi_find_root_pointer");
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/* Get the RSDP */
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status = acpi_tb_find_rsdp (&table_info, flags);
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if (ACPI_FAILURE (status)) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"RSDP structure not found, %s Flags=%X\n",
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acpi_format_exception (status), flags));
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return_ACPI_STATUS (AE_NO_ACPI_TABLES);
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}
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rsdp_address->pointer_type = ACPI_PHYSICAL_POINTER;
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rsdp_address->pointer.physical = table_info.physical_address;
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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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* FUNCTION: acpi_tb_scan_memory_for_rsdp
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*
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* PARAMETERS: start_address - Starting pointer for search
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* Length - Maximum length to search
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*
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* RETURN: Pointer to the RSDP if found, otherwise NULL.
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*
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* DESCRIPTION: Search a block of memory for the RSDP signature
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*
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******************************************************************************/
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u8 *
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acpi_tb_scan_memory_for_rsdp (
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u8 *start_address,
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u32 length)
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{
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u8 *mem_rover;
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u8 *end_address;
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u8 checksum;
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ACPI_FUNCTION_TRACE ("tb_scan_memory_for_rsdp");
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end_address = start_address + length;
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/* Search from given start address for the requested length */
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for (mem_rover = start_address; mem_rover < end_address;
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mem_rover += ACPI_RSDP_SCAN_STEP) {
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/* The signature and checksum must both be correct */
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if (ACPI_STRNCMP ((char *) mem_rover, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
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/* No signature match, keep looking */
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continue;
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}
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/* Signature matches, check the appropriate checksum */
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if ((ACPI_CAST_PTR (struct rsdp_descriptor, mem_rover))->revision < 2) {
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/* ACPI version 1.0 */
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checksum = acpi_tb_checksum (mem_rover, ACPI_RSDP_CHECKSUM_LENGTH);
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}
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else {
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/* Post ACPI 1.0, use extended_checksum */
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checksum = acpi_tb_checksum (mem_rover, ACPI_RSDP_XCHECKSUM_LENGTH);
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}
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if (checksum == 0) {
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/* Checksum valid, we have found a valid RSDP */
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"RSDP located at physical address %p\n", mem_rover));
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return_PTR (mem_rover);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"Found an RSDP at physical address %p, but it has a bad checksum\n",
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mem_rover));
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}
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/* Searched entire block, no RSDP was found */
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"Searched entire block, no valid RSDP was found.\n"));
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return_PTR (NULL);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_find_rsdp
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*
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* PARAMETERS: *table_info - Where the table info is returned
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* Flags - Current memory mode (logical vs.
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* physical addressing)
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*
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* RETURN: Status, RSDP physical address
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*
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* DESCRIPTION: search lower 1_mbyte of memory for the root system descriptor
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* pointer structure. If it is found, set *RSDP to point to it.
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*
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* NOTE1: The RSDp must be either in the first 1_k of the Extended
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* BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.)
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* Only a 32-bit physical address is necessary.
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*
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* NOTE2: This function is always available, regardless of the
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* initialization state of the rest of ACPI.
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*
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******************************************************************************/
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acpi_status
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acpi_tb_find_rsdp (
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struct acpi_table_desc *table_info,
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u32 flags)
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{
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u8 *table_ptr;
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u8 *mem_rover;
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u32 physical_address;
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acpi_status status;
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ACPI_FUNCTION_TRACE ("tb_find_rsdp");
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/*
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* Scan supports either 1) Logical addressing or 2) Physical addressing
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*/
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if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
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/*
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* 1a) Get the location of the EBDA
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*/
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status = acpi_os_map_memory ((acpi_physical_address) ACPI_EBDA_PTR_LOCATION,
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ACPI_EBDA_PTR_LENGTH,
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(void *) &table_ptr);
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if (ACPI_FAILURE (status)) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Could not map memory at %8.8X for length %X\n",
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ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH));
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return_ACPI_STATUS (status);
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}
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ACPI_MOVE_16_TO_32 (&physical_address, table_ptr);
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physical_address <<= 4; /* Convert segment to physical address */
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acpi_os_unmap_memory (table_ptr, ACPI_EBDA_PTR_LENGTH);
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/* EBDA present? */
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if (physical_address > 0x400) {
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/*
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* 1b) Search EBDA paragraphs (EBDa is required to be a minimum of 1_k length)
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*/
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status = acpi_os_map_memory ((acpi_physical_address) physical_address,
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ACPI_EBDA_WINDOW_SIZE,
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(void *) &table_ptr);
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if (ACPI_FAILURE (status)) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Could not map memory at %8.8X for length %X\n",
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physical_address, ACPI_EBDA_WINDOW_SIZE));
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return_ACPI_STATUS (status);
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}
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mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr, ACPI_EBDA_WINDOW_SIZE);
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|
acpi_os_unmap_memory (table_ptr, ACPI_EBDA_WINDOW_SIZE);
|
|
|
|
if (mem_rover) {
|
|
/* Found it, return the physical address */
|
|
|
|
physical_address += ACPI_PTR_DIFF (mem_rover, table_ptr);
|
|
|
|
table_info->physical_address = (acpi_physical_address) physical_address;
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
|
|
*/
|
|
status = acpi_os_map_memory ((acpi_physical_address) ACPI_HI_RSDP_WINDOW_BASE,
|
|
ACPI_HI_RSDP_WINDOW_SIZE,
|
|
(void *) &table_ptr);
|
|
if (ACPI_FAILURE (status)) {
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
|
|
"Could not map memory at %8.8X for length %X\n",
|
|
ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE));
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
|
|
mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
|
|
acpi_os_unmap_memory (table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
|
|
|
|
if (mem_rover) {
|
|
/* Found it, return the physical address */
|
|
|
|
physical_address = ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (mem_rover, table_ptr);
|
|
|
|
table_info->physical_address = (acpi_physical_address) physical_address;
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Physical addressing
|
|
*/
|
|
else {
|
|
/*
|
|
* 1a) Get the location of the EBDA
|
|
*/
|
|
ACPI_MOVE_16_TO_32 (&physical_address, ACPI_EBDA_PTR_LOCATION);
|
|
physical_address <<= 4; /* Convert segment to physical address */
|
|
|
|
/* EBDA present? */
|
|
|
|
if (physical_address > 0x400) {
|
|
/*
|
|
* 1b) Search EBDA paragraphs (EBDa is required to be a minimum of 1_k length)
|
|
*/
|
|
mem_rover = acpi_tb_scan_memory_for_rsdp (ACPI_PHYSADDR_TO_PTR (physical_address),
|
|
ACPI_EBDA_WINDOW_SIZE);
|
|
if (mem_rover) {
|
|
/* Found it, return the physical address */
|
|
|
|
table_info->physical_address = ACPI_TO_INTEGER (mem_rover);
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
|
|
*/
|
|
mem_rover = acpi_tb_scan_memory_for_rsdp (ACPI_PHYSADDR_TO_PTR (ACPI_HI_RSDP_WINDOW_BASE),
|
|
ACPI_HI_RSDP_WINDOW_SIZE);
|
|
if (mem_rover) {
|
|
/* Found it, return the physical address */
|
|
|
|
table_info->physical_address = ACPI_TO_INTEGER (mem_rover);
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
}
|
|
|
|
/* RSDP signature was not found */
|
|
|
|
return_ACPI_STATUS (AE_NOT_FOUND);
|
|
}
|
|
|
|
#endif
|
|
|