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324 lines
9.4 KiB
C
324 lines
9.4 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 - 2019, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "acpi.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 ("tbxfroot")
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbGetRsdpLength
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*
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* PARAMETERS: Rsdp - Pointer to RSDP
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*
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* RETURN: Table length
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*
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* DESCRIPTION: Get the length of the RSDP
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*
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******************************************************************************/
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UINT32
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AcpiTbGetRsdpLength (
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ACPI_TABLE_RSDP *Rsdp)
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{
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if (!ACPI_VALIDATE_RSDP_SIG (Rsdp->Signature))
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{
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/* BAD Signature */
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return (0);
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}
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/* "Length" field is available if table version >= 2 */
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if (Rsdp->Revision >= 2)
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{
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return (Rsdp->Length);
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}
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else
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{
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return (ACPI_RSDP_CHECKSUM_LENGTH);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbValidateRsdp
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*
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* PARAMETERS: Rsdp - Pointer to unvalidated RSDP
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*
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* RETURN: Status
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*
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* DESCRIPTION: Validate the RSDP (ptr)
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiTbValidateRsdp (
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ACPI_TABLE_RSDP *Rsdp)
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{
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/*
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* The signature and checksum must both be correct
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*
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* Note: Sometimes there exists more than one RSDP in memory; the valid
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* RSDP has a valid checksum, all others have an invalid checksum.
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*/
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if (!ACPI_VALIDATE_RSDP_SIG (Rsdp->Signature))
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{
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/* Nope, BAD Signature */
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return (AE_BAD_SIGNATURE);
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}
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/* Check the standard checksum */
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if (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0)
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{
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return (AE_BAD_CHECKSUM);
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}
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/* Check extended checksum if table version >= 2 */
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if ((Rsdp->Revision >= 2) &&
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(AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0))
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{
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return (AE_BAD_CHECKSUM);
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiFindRootPointer
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*
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* PARAMETERS: TableAddress - Where the table pointer is returned
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*
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* RETURN: Status, RSDP physical address
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*
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* DESCRIPTION: Search lower 1Mbyte 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 1K 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 ACPI_INIT_FUNCTION
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AcpiFindRootPointer (
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ACPI_PHYSICAL_ADDRESS *TableAddress)
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{
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UINT8 *TablePtr;
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UINT8 *MemRover;
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UINT32 PhysicalAddress;
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ACPI_FUNCTION_TRACE (AcpiFindRootPointer);
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/* 1a) Get the location of the Extended BIOS Data Area (EBDA) */
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TablePtr = AcpiOsMapMemory (
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(ACPI_PHYSICAL_ADDRESS) ACPI_EBDA_PTR_LOCATION,
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ACPI_EBDA_PTR_LENGTH);
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if (!TablePtr)
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{
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ACPI_ERROR ((AE_INFO,
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"Could not map memory at 0x%8.8X for length %u",
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ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH));
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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ACPI_MOVE_16_TO_32 (&PhysicalAddress, TablePtr);
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/* Convert segment part to physical address */
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PhysicalAddress <<= 4;
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AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_PTR_LENGTH);
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/* EBDA present? */
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if (PhysicalAddress > 0x400)
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{
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/*
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* 1b) Search EBDA paragraphs (EBDA is required to be a
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* minimum of 1K length)
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*/
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TablePtr = AcpiOsMapMemory (
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(ACPI_PHYSICAL_ADDRESS) PhysicalAddress,
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ACPI_EBDA_WINDOW_SIZE);
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if (!TablePtr)
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{
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ACPI_ERROR ((AE_INFO,
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"Could not map memory at 0x%8.8X for length %u",
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PhysicalAddress, ACPI_EBDA_WINDOW_SIZE));
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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MemRover = AcpiTbScanMemoryForRsdp (
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TablePtr, ACPI_EBDA_WINDOW_SIZE);
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AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_WINDOW_SIZE);
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if (MemRover)
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{
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/* Return the physical address */
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PhysicalAddress +=
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(UINT32) ACPI_PTR_DIFF (MemRover, TablePtr);
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*TableAddress = (ACPI_PHYSICAL_ADDRESS) PhysicalAddress;
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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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* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
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*/
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TablePtr = AcpiOsMapMemory (
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(ACPI_PHYSICAL_ADDRESS) ACPI_HI_RSDP_WINDOW_BASE,
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ACPI_HI_RSDP_WINDOW_SIZE);
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if (!TablePtr)
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{
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ACPI_ERROR ((AE_INFO,
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"Could not map memory at 0x%8.8X for length %u",
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ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE));
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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MemRover = AcpiTbScanMemoryForRsdp (
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TablePtr, ACPI_HI_RSDP_WINDOW_SIZE);
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AcpiOsUnmapMemory (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE);
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if (MemRover)
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{
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/* Return the physical address */
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PhysicalAddress = (UINT32)
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(ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (MemRover, TablePtr));
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*TableAddress = (ACPI_PHYSICAL_ADDRESS) PhysicalAddress;
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return_ACPI_STATUS (AE_OK);
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}
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/* A valid RSDP was not found */
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ACPI_BIOS_ERROR ((AE_INFO, "A valid RSDP was not found"));
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return_ACPI_STATUS (AE_NOT_FOUND);
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}
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ACPI_EXPORT_SYMBOL_INIT (AcpiFindRootPointer)
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbScanMemoryForRsdp
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*
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* PARAMETERS: StartAddress - 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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UINT8 *
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AcpiTbScanMemoryForRsdp (
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UINT8 *StartAddress,
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UINT32 Length)
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{
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ACPI_STATUS Status;
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UINT8 *MemRover;
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UINT8 *EndAddress;
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ACPI_FUNCTION_TRACE (TbScanMemoryForRsdp);
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EndAddress = StartAddress + Length;
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/* Search from given start address for the requested length */
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for (MemRover = StartAddress; MemRover < EndAddress;
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MemRover += ACPI_RSDP_SCAN_STEP)
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{
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/* The RSDP signature and checksum must both be correct */
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Status = AcpiTbValidateRsdp (
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ACPI_CAST_PTR (ACPI_TABLE_RSDP, MemRover));
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if (ACPI_SUCCESS (Status))
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{
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/* Sig and checksum valid, we have found a real RSDP */
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"RSDP located at physical address %p\n", MemRover));
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return_PTR (MemRover);
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}
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/* No sig match or bad checksum, keep searching */
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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 from %p, valid RSDP was not found\n",
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StartAddress));
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return_PTR (NULL);
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}
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