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author | jkim <jkim@FreeBSD.org> | 2012-02-16 22:59:29 +0000 |
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committer | jkim <jkim@FreeBSD.org> | 2012-02-16 22:59:29 +0000 |
commit | a561c762bacb78b14d2bf5fb20afc1566203f990 (patch) | |
tree | d4ae2db1980d2ec7b164b1a5658fd2ae62569456 /sys/contrib/dev/acpica/components/tables/tbxfroot.c | |
parent | 2b86faa18cb89921d202e133fa6a1c39b63cfe16 (diff) | |
parent | a6dfe3119152f97e640cc135d963b9f7c95c84ef (diff) | |
download | FreeBSD-src-a561c762bacb78b14d2bf5fb20afc1566203f990.zip FreeBSD-src-a561c762bacb78b14d2bf5fb20afc1566203f990.tar.gz |
Merge ACPICA 20120215.
Diffstat (limited to 'sys/contrib/dev/acpica/components/tables/tbxfroot.c')
-rw-r--r-- | sys/contrib/dev/acpica/components/tables/tbxfroot.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/sys/contrib/dev/acpica/components/tables/tbxfroot.c b/sys/contrib/dev/acpica/components/tables/tbxfroot.c new file mode 100644 index 0000000..c6ade4e --- /dev/null +++ b/sys/contrib/dev/acpica/components/tables/tbxfroot.c @@ -0,0 +1,299 @@ +/****************************************************************************** + * + * Module Name: tbxfroot - Find the root ACPI table (RSDT) + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2012, Intel Corp. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + +#define __TBXFROOT_C__ + +#include <contrib/dev/acpica/include/acpi.h> +#include <contrib/dev/acpica/include/accommon.h> +#include <contrib/dev/acpica/include/actables.h> + + +#define _COMPONENT ACPI_TABLES + ACPI_MODULE_NAME ("tbxfroot") + +/* Local prototypes */ + +static UINT8 * +AcpiTbScanMemoryForRsdp ( + UINT8 *StartAddress, + UINT32 Length); + +static ACPI_STATUS +AcpiTbValidateRsdp ( + ACPI_TABLE_RSDP *Rsdp); + + +/******************************************************************************* + * + * FUNCTION: AcpiTbValidateRsdp + * + * PARAMETERS: Rsdp - Pointer to unvalidated RSDP + * + * RETURN: Status + * + * DESCRIPTION: Validate the RSDP (ptr) + * + ******************************************************************************/ + +static ACPI_STATUS +AcpiTbValidateRsdp ( + ACPI_TABLE_RSDP *Rsdp) +{ + ACPI_FUNCTION_ENTRY (); + + + /* + * The signature and checksum must both be correct + * + * Note: Sometimes there exists more than one RSDP in memory; the valid + * RSDP has a valid checksum, all others have an invalid checksum. + */ + if (ACPI_STRNCMP ((char *) Rsdp, ACPI_SIG_RSDP, + sizeof (ACPI_SIG_RSDP)-1) != 0) + { + /* Nope, BAD Signature */ + + return (AE_BAD_SIGNATURE); + } + + /* Check the standard checksum */ + + if (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) + { + return (AE_BAD_CHECKSUM); + } + + /* Check extended checksum if table version >= 2 */ + + if ((Rsdp->Revision >= 2) && + (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) + { + return (AE_BAD_CHECKSUM); + } + + return (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiFindRootPointer + * + * PARAMETERS: TableAddress - Where the table pointer is returned + * + * RETURN: Status, RSDP physical address + * + * DESCRIPTION: Search lower 1Mbyte of memory for the root system descriptor + * pointer structure. If it is found, set *RSDP to point to it. + * + * NOTE1: The RSDP must be either in the first 1K of the Extended + * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.) + * Only a 32-bit physical address is necessary. + * + * NOTE2: This function is always available, regardless of the + * initialization state of the rest of ACPI. + * + ******************************************************************************/ + +ACPI_STATUS +AcpiFindRootPointer ( + ACPI_SIZE *TableAddress) +{ + UINT8 *TablePtr; + UINT8 *MemRover; + UINT32 PhysicalAddress; + + + ACPI_FUNCTION_TRACE (AcpiFindRootPointer); + + + /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */ + + TablePtr = AcpiOsMapMemory ( + (ACPI_PHYSICAL_ADDRESS) ACPI_EBDA_PTR_LOCATION, + ACPI_EBDA_PTR_LENGTH); + if (!TablePtr) + { + ACPI_ERROR ((AE_INFO, + "Could not map memory at 0x%8.8X for length %u", + ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH)); + + return_ACPI_STATUS (AE_NO_MEMORY); + } + + ACPI_MOVE_16_TO_32 (&PhysicalAddress, TablePtr); + + /* Convert segment part to physical address */ + + PhysicalAddress <<= 4; + AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_PTR_LENGTH); + + /* EBDA present? */ + + if (PhysicalAddress > 0x400) + { + /* + * 1b) Search EBDA paragraphs (EBDA is required to be a + * minimum of 1K length) + */ + TablePtr = AcpiOsMapMemory ( + (ACPI_PHYSICAL_ADDRESS) PhysicalAddress, + ACPI_EBDA_WINDOW_SIZE); + if (!TablePtr) + { + ACPI_ERROR ((AE_INFO, + "Could not map memory at 0x%8.8X for length %u", + PhysicalAddress, ACPI_EBDA_WINDOW_SIZE)); + + return_ACPI_STATUS (AE_NO_MEMORY); + } + + MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_EBDA_WINDOW_SIZE); + AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_WINDOW_SIZE); + + if (MemRover) + { + /* Return the physical address */ + + PhysicalAddress += (UINT32) ACPI_PTR_DIFF (MemRover, TablePtr); + + *TableAddress = PhysicalAddress; + return_ACPI_STATUS (AE_OK); + } + } + + /* + * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh + */ + TablePtr = AcpiOsMapMemory ( + (ACPI_PHYSICAL_ADDRESS) ACPI_HI_RSDP_WINDOW_BASE, + ACPI_HI_RSDP_WINDOW_SIZE); + + if (!TablePtr) + { + ACPI_ERROR ((AE_INFO, + "Could not map memory at 0x%8.8X for length %u", + ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE)); + + return_ACPI_STATUS (AE_NO_MEMORY); + } + + MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE); + AcpiOsUnmapMemory (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE); + + if (MemRover) + { + /* Return the physical address */ + + PhysicalAddress = (UINT32) + (ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (MemRover, TablePtr)); + + *TableAddress = PhysicalAddress; + return_ACPI_STATUS (AE_OK); + } + + /* A valid RSDP was not found */ + + ACPI_ERROR ((AE_INFO, "A valid RSDP was not found")); + return_ACPI_STATUS (AE_NOT_FOUND); +} + +ACPI_EXPORT_SYMBOL (AcpiFindRootPointer) + + +/******************************************************************************* + * + * FUNCTION: AcpiTbScanMemoryForRsdp + * + * PARAMETERS: StartAddress - Starting pointer for search + * Length - Maximum length to search + * + * RETURN: Pointer to the RSDP if found, otherwise NULL. + * + * DESCRIPTION: Search a block of memory for the RSDP signature + * + ******************************************************************************/ + +static UINT8 * +AcpiTbScanMemoryForRsdp ( + UINT8 *StartAddress, + UINT32 Length) +{ + ACPI_STATUS Status; + UINT8 *MemRover; + UINT8 *EndAddress; + + + ACPI_FUNCTION_TRACE (TbScanMemoryForRsdp); + + + EndAddress = StartAddress + Length; + + /* Search from given start address for the requested length */ + + for (MemRover = StartAddress; MemRover < EndAddress; + MemRover += ACPI_RSDP_SCAN_STEP) + { + /* The RSDP signature and checksum must both be correct */ + + Status = AcpiTbValidateRsdp (ACPI_CAST_PTR (ACPI_TABLE_RSDP, MemRover)); + if (ACPI_SUCCESS (Status)) + { + /* Sig and checksum valid, we have found a real RSDP */ + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "RSDP located at physical address %p\n", MemRover)); + return_PTR (MemRover); + } + + /* No sig match or bad checksum, keep searching */ + } + + /* Searched entire block, no RSDP was found */ + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Searched entire block from %p, valid RSDP was not found\n", + StartAddress)); + return_PTR (NULL); +} + |