The WSMT table definition is described in the Windows SMM Security Mitigations Table (WMST Jun 24, 2024 · The Windows ACPI driver, Acpi. Requests to reserve a 4-byte alphanumeric table signature should be sent to the email address info @ acpi . AcpiExec - Load ACPI tables and execute control methods from user space. The ACPI has a specification for how the Microsoft Windows key is stored, which is only Mar 20, 2019 · acpiexec – emulate ACPI tables from extracted tables; iasl – compile & disassemble ACPI tables; A Case Study – Airplane Mode. Intel North Mux-Agent. 除了本文所述的特定資料表之外，Windows 還會利用這個資料表傳遞機制。. In order to change the language of FirmwareTablesView, download the appropriate language zip file, extract the 'firmwaretablesview_lng. Probing devices in other D states than 0. ini', and put it in the same folder that you Installed FirmwareTablesView utility. DLL. 0 specification does not specifically prohibit the use of only the _UPC object, the use of both objects more precisely indicates the user's ability to connect This crate is designed to find and parse the static tables ACPI provides. Table 18. sys include support for power management and Plug and Play (PnP) device enumeration. Fan Device ¶. However, Windows supports _OSI only for the use of identifying the host version of Windows that is running on the system. Implementing ACPI. InstallAcpiTable () ¶. This process is facilitated by the ACPI driver within the operating system, which acts as an interpreter between the ACPI firmware definitions and the ACPI defines multiple processor power state (C state) control interfaces. ACPI defines two types of data structures that are shared between system firmware and the OS via the ACPI subsystem: data tables and definition blocks (see figure below). Designed to be easy to use from Rust bootloaders and kernels. Supporting ACPI Devices. ACPI Non-Volatile-Sleeping Memory (NVS). performance levels. If an FACS table is provided, the X_FIRMWARE_CTRL field is to be used, not FIRMWARE_CTRL. Byte Length. e Clover and OpenCore Bootloader, beginner users may find this method a bit difficult. 0b 以及微軟網站介紹，下圖為參考微軟文件說明： Mar 27, 2024 · Detailed Description. 13, High Sierra the OS is much stricter with ACPI tables, specifically a bug with how headers were handled (opens new window). ACPI is the key element in Operating System-directed configuration and Mar 3, 2023 · Actual PCI changes will be added in future along with external interrupt controller support in ACPI. Kdexts. 0 specification. 這些資料表背後的 rsdp contains a helper for creating a RSDP table. 0 (or later). For ACPI, if the system contains multiple tables with the Oct 6, 2015 · The table is located in system memory with other Advanced Configuration and Power Interface (ACPI) tables, and must be referenced in the ACPI Root System Description Table (RSDT). In the G0 state, work is being performed by the OS/application software and the hardware. So, it means your firmware is not compliant to the PCI Windows Platform Binary Table (WPBT) is an ACPI table in your firmware allowing your computer vendor to run a program every time Windows (8 or later) boots. Notice that multiple fan devices can be present for any one thermal zone. See here on how to use it: SSDTs: Easy Way. 0 specification defines several types of namespace objects that can be used to manage devices. Mar 29, 2024 · The full name of ACPI is Advanced Configuration and Power Interface. 208 Predefined Operating System Vendor String Prefixes. 6 Namespace Management The Namespace component provides ACPI Aug 19, 2021 · GetSystemFirmwareTable can be used to retrieve an ACPI system table. Thermal zones reference fan device (s) as being responsible primarily for cooling within that zone. 1 Errata A 1639 _WPC and _WPP are missing in the Predefined ACPI Names table. The library is split into three crates: rsdp parses the RSDP and can locate it on BIOS platforms. Dec 31, 2023 · Fixing Power Management: SSDTTime. ACPI 1. P-states can be compared with various. On UEFI systems, it is conveniently given within the EFI_SYSTEM_TABLE. Feb 15, 2023 · The ACPI table provider ('ACPI') retrieves the contents of the specified ACPI table. It is a large, well-written spec, compared to some of the recent ACPI specs I’ve looked at. STEP 1: Extracting ACPI Tables. Apr 24, 2024 · ACPI Tables. In order for the kernel to load and use ACPI tables, the UEFI implementation MUST set the ACPI_20_TABLE_GUID to point to the RSDP table (the table with the ACPI signature “RSD PTR “). The default value is 0. DisplayLevel Specifies the detail level of the display. 7. Although the ACPI 6. On traditional BIOS systems, two memory areas need to be searched. Debug Port Table 2 (DBG2) Table 1. These are: The Processor Register Block’s (P_BLK’s) P_LVL2 and P_LVL3 registers coupled with FADT P_LVLx_LAT values and. The table below defines the mapping from UEFI memory types (see UEFI Specification) to ACPI Address Range Types that: Platform boot firmware shall follow if describing the memory range in both UEFI and legacy BIOS modes; and. The _LPI objects for processors and processor containers. The names should be listed as an array of strings which will map to the Interrupt() resource in the ACPI table corresponding to its index. To get the SSDT-PLUG, run the following: 7. 62 Since the ACPI tables are typically too large to put in the 128KB BIOS memory area, the ACPI BIOS obtains a physical memory map of the system in order to allocate space for the ACPI tables. It allows manually setting the address to take a look at existing ACPI tables. Download Windows 10 kits, tools, and code samples. 1 Device Identification Objects. The Advanced Configuration and Power Interface (ACPI) specification is an industry standard, provided by the UEFI forum, where Arm is a board member. When OSPM is finished using the ACPI tables, it is free to reclaim this memory for system software use (application space). This is a convenient method for computer vendors to force the installation of a service program or an anti-theft software, but this also means your fresh installed Windows will have potentially unwanted 3rd party programs running straight An ACPI 1. 这些表格背后的理念是使通用软件能够支持标准的 3 ACPI Table Interface The pointer to the BIOS data structure shall be defined in a custom ACPI table to provide compatibility across multiple platforms. The airplane-mode button on laptops usually requires implementation from both system BIOS and an OS driver. Removes a previously installed ACPI table from the system. Drivers enumerated via ACPI can have names to interrupts in the ACPI table which can be used to get the IRQ number in the driver. The illustration below shows the transitions between the working state, the sleeping states, and the Soft Off state. dsl See this post: load custom ACPI table in Linux ACPI serves as an interface layer between the operating system and system firmware, as shown in the following figure. dat Now modify facp. Language between ACPI tables for TPM 1. The _CST object in the processor’s object list. 5 ACPI Table Management This component manages the ACPI tables. Total reports: 507. The output is an ACPI SSDT table in ASL. ACPI Tables. 7. UninstallAcpiTable. If a valid structure is found (e. The Advanced Configuration and Power Interface (ACPI) specification was developed to establish industry common interfaces enabling robust operating system (OS)-directed motherboard device configuration and power management of both devices and entire systems. 3 of the ACPI specification. 20. For more information about ACPI, see the ACPI 5. spcr contains routines for creating a SPCR table (not included in ACPI specification, see 0 for details) srat contains routines for creating a SRAT table. g. 0 devices. It does not depend on alloc, so is suitable to use from bootloaders without heap alloctors. Mar 2, 2024 · On macOS 10. aml. Jan 11, 2022 · The ACPI firmware must provide and implement a single ACPI power source device per section 10. Sphinx 5. 1 ACPI overview ¶. When an ACPI-aware operating system kernel is started, it search for a small data structure within the BIOS memory area. ACPI table 介紹. These elements are typically going to encompass things that are likely otherwise not enumerable during the OS runtime phase of operations, such as version of pre-OS components. Section 5. Information about ACPI is stored in the BIOS's memory (for those systems that support ACPI of course). 20 Serialization Instruction Entry ¶ Field. ACPI uses several tables to store information about the hardware configuration and system state. Table 5-161 6. Recompile facp. 2. huang@intel. Jan 17, 2020 · This facility also provides a powerful feature to debug and test ACPI BIOS table compatibility quickly with the Linux kernel by changing the old platform provided ACPI tables or inserting new ACPI tables. Section 2. . LITTLE/ x Display/ x Debug/ = Firmware LITTLE Headless Release. 除了本文所述的特定表之外，Windows 还会使用这种表传递机制。. Basic functions of ACPI include: 16. If OSPM only needs to know a near/far distinction among the System Localities, comparing Proximity Domain values is sufficient. May 17, 2016 ~ hucktech. org : The Advanced Configuration and Power Interface (ACPI) specification was developed to establish industry common interfaces enabling robust operating system (OS) directed motherboard device configuration and power management of both devices and entire systems. Special Usage Model of the ACPI Control Method Lid Device. !acpicache [DisplayLevel] Parameters. Because OEMs can include ACPI firmware tables that are not listed in the ACPI specification, you should first call EnumSystemFirmwareTables to enumerate all ACPI tables that are currently on the system. 固定ACPI描述表（Fixed ACPI Description Table (FADT)） 一个包含ACPI 硬件寄存器块（Hardware Register Block）的实现和配置详细信息的表，OS需要用这些配置信息来直接管理ACPI硬件寄存器块和DSDT的物理地址，DSDT则包含其他平台的实现和配置详细信息。 May 2, 2022 · ACPI Tables — The Linux Kernel documentation. ASL provides the following types of “store” operations: The Store operator is used to explicitly store an object to a location, with implicit conversion support of the source object. Table 5-6 changes. 0 规范 中定义。. For example, device identification objects contain identification Apr 2, 2024 · The !acpicache extension displays all of the Advanced Configuration and Power Interface (ACPI) tables cached by the HAL. Jun 29, 2016 · From: Huang Ying <ying. 1 Errata A 1616 Clarify which processor ID to use in the EINJ for ARM Table 18-359 6. aml file residing inside your EFI Partition SysReport/ACPI folder, otherwise please follow the procedure here to get started. How to retrieve Windows 8 and Windows 10/11 OEM product key from BIOS when using Linux Aug 30, 2023 · ACPI 會定義泛型、可延伸的資料表傳遞機制，以及描述平臺至作業系統的特定資料表。. If the ACPI_TABLE_UPGRADE compile option is true, it is possible to upgrade the ACPI execution environment that is defined by the ACPI tables via upgrading the ACPI tables provided by the BIOS with an instrumented, modified, more recent version one, or installing brand new ACPI tables. Change "reduced hardware support" from 1 to 0. 207 Predefined Object Names. To resolve, enable NormalizeHeaders under ACPI -> Quirks in your config. The tables may be loaded from the firmware or di-rectly from a buffer provided by the host oper-ating system. If a section number is used, it refers to a section number in the ACPI specification where the object is defined. 1 Errata A 1606 Errata: typos in the Interrupt Resource Descriptor Macro definition Table 19. To patch APIC using the "Manual SSDT Patch", follow the steps below. Fig. SSDTSamples. Apr 12, 2023 · Although this method is supported by both i. 2 ADR Object Address Encodings Dec 31, 2023 · A quick explainer on ACPI. The serialization action that this serialization instruction is a part of. The HW_REDUCED_ACPI flag must be set. dsl $ iasl -sa facp. These tables are crucial as they contain data that the operating system needs to understand the capabilities of the hardware and how to manage it. 209 Standard ACPI-Defined Feature Group Strings. acpid. ACPI Table還可以用來當作OS 啟動金鑰，例如SLIC Table就是一個例子，OS透過檢查包在BIOS ROM中的ACPI Table的內容來決定是不是一個台OEM 電腦。 其他詳細介紹請參閱ACPI Spec 3. N+0. The system state indicator objects The ACPI driver. 5. The ACPI MCFG table describes the location of the PCI Express configuration space, and this table will be present in a firmware implementation compliant to this specification version 3. A Serialization Action is defined as a series of Serialization Instructions on registers that result in a well known action. Simple tool for Windows that displays a list of firmware tables (ACPI, SMBIOS) stored on your system. P-states are a combination of processor. There are many varieties of ACPI tables, but they break into two main categories - configuration data and ACPI Machine Language (AML) byte code. Released in December 1996, ACPI is actually the industry specification to handle the power consumption in both desktop and mobile computers. Intel INT3496 ACPI device extcon driver documentation. Dec 31, 2023 · First we need to gather files necessary to patch our DMAR Table. 1 Example Sleeping States ¶. It can and should be enabled in any kernel because there is no functional change with not instrumented initrds. This section describes how a vendor can use a WDM function driver in Windows to enhance the functionality of an Advanced Configuration and Power Interface (ACPI) device. 6. The OS would be installed later somewhere else (hard drive or so). 3. 2 states. 5) Addressed other comments from Conor. It's not stored in the UEFI it's stored in the ACPI table which the UEFI shell can access. Unlike previous versions such as APM or PnP BIOS, ACPI hardly implements its functionality in ACPI BIOS code, and the main role of ACPI BIOS code is to load the ACPI tables in system memory. The Windows SMM Security Mitigation Table (WSMT) is an ACPI table defined by Microsoft that allows system firmware to confirm to the operating system that certain security best practices have been implemented in System Management Mode (SMM) software. Feb 6, 2024 · By leveraging these tables, ACPI enables the operating system to identify hardware components, understand their power management features, and apply appropriate power policies dynamically. Summary. More specifically, it requires an ACPI device to be “present” in DSDT (or SSDT) table and a Upgrading ACPI tables via initrd¶ What is this about¶. 1 Alabaster 0. 9 (signature == “FACP”) Fixed ACPI Description Table Required for arm64. g Dec 31, 2023 · What this ACPI Table does. Description. Introduction. Erroneous tables generated while handcrafting tables. Serialization Action. voltage and processor frequency. If “Signature Reserved” is used, the table signature (the first four bytes of the table) is the only portion of the table Specifies the byte offset to the remaining data in the UEFI table. Jun 21, 2024 · ACPI 定义了一种通用可扩展表传递机制，以及用于向操作系统描述平台的特定表。. Chrome OS ACPI Device. Power and Performance Management ¶. The first use of this UEFI ACPI table format is the SMM Communication ACPI Table. The interrupt name can be listed in _DSD as ‘interrupt-names’. We would like to show you a description here but the site won’t allow us. 9 (signature == "FACP") Fixed ACPI Description Table Required for arm64. 0 OS evaluates the _EJD methods only once during the table load process. The second argument to this function is the firmware table ID, e. From uefi. the ACPI tables as necessary with various platform configurations and power interface data, before passing control to the bootstrap loader. Installs an ACPI table into the RSDT/XSDT. Serialization Action Table. 資料表結構和標頭，包括識別碼和總和檢查碼欄位，都是在 ACPI 5. May 2, 2022 · Section 5. Once you have the file, it is best to The acpi command is used to dump the ACPI tables generated by U-Boot for passing to the operating systems. sdt provides the ability to build user defined tables including header and checksum validation. info and should include the purpose of the table and reference URL to Mar 17, 2023 · Recent versions of the ACPI specification have extended the use cases of the _OSI method beyond host operating system version identification. A Serialization Instruction is a Serialization Action primitive and consists of either reading or writing an abstracted hardware register. The ACPI specification is large and unwieldy hence the Linux ACPI driver is a very large and complex software component. So what are DSDTs and SSDTs? Well, these are tables present in your firmware that outline hardware devices like USB controllers, CPU threads, embedded controllers, system clocks and such. ACPI defines distinct differences between the G0 and G1 system states. Advanced Configuration and Power Interface (ACPI) Specification, Release 6. The Windows* versions of the various tools are zipped in a single file that is available here: Major tools and utilities: iASL - Advanced Configuration and Power Interface (ACPI) Source Language Compiler, ACPI Table Compiler, and AML Disassembler. The DBG2 table replaces the ACPI Debug Port Table (DBGP) on platforms whose debug port implementations cannot be described using DBGP. . EFI_ACPI_TABLE_PROTOCOL. 表结构和标头（包括 ID 和校验和字段）在 ACPI 5. Instruction. I/O Virtualization Reporting Structure (IVRS) This document describes AMD I/O Virtualization Technology. This object must report itself with a Hardware ID (_HID) of "ACPI0003". If you build your own machine, the license key must be a retail license, it's not possible to get an OEM license on a custom built PC. 1. 6. Fan Device. For those looking to achieve the same results in QEMU, you can count your blessings that the developers provided a convenient way to set the OEM ID and associated fields for ACPI tables using something like this to override default values: qemu -acpidefault oem_id=ALASKA,oem_table_id=AMI. 1 Errata A 1642 Clarifications and fixes to _PSD and _TSD Table 5-180 6. Using RWEverything to list ACPI tables, I see many SSDT tables for example. This facility also provides a powerful feature to easily debug and test ACPI BIOS table compatibility with the Linux kernel by modifying old platform provided ACPI tables or inserting new ACPI tables. 0 devices it became necessary to update the definition of ACPI tables that describe the TPM device in the ACPI namespace. Note For systems that have multiple power sources, all physical power sources must be multiplexed through a single power device object in ACPI. BIOS在POST過程中，將RSDP存在0xE0000–0xFFFFF的內存空間中，然後Move RSDT/XSDT, FADT, DSDT到ACPI Recleam Area, Move FACS到ACPI NVS Area Aug 31, 2015 · On server/PC motherboards, the ACPI table is a part of the UEFI firmware, which resides on the flash chip. Everyone can contribute to this repository by uploading probes of their computers by the hw-probe tool: sudo -E hw-probe -all -upload -dump-acpi. 206 Predefined ACPI Names. What changed in the TCG ACPI Specification? Added definition of the TPM2 ACPI table for TPM 2. The _OSI method is defined as follows: _OSI - Operating System Interfaces; Argument 18. There are 2 main parts to ACPI. The most important tables are: DSDT (Differentiated System Description Table). big/ Juno x big. 16. I just noticed this March-era update to the UEFI list of ACPI specs. ACPI is the key element in OS-directed Mar 23, 2023 · ACPI defines a generic, extensible table-passing mechanism, plus specific tables for describing the platform to the operating system. This will provide you with some files, the main one you care about is SSDT-PLUG. The extended root system description table (XSDT) is the first table used by the ACPI subsystem and contains the addresses of most of ACPI Tables. The PHAT is an ACPI table where a platform can expose health related telemetry that may be useful for software running within the constraints of an OS. 210 DeviceLockInfo Package Values. This value is either 0 for an abbreviated display or 1 for a more detailed display. Table 6. dsl with a text editor. reduce the electrical power consumption, whereas the processor executes code. This is a repository of decoded ACPI tables for various computers collected by Linux users at https://linux-hardware. The very first step is to extract your native ACPI Tables. This greatly restricts a table designer’s freedom to describe dynamic dependencies such as those created in scenarios with multiple docking stations. ACPI I2C Muxes. Low Power Idle Table (LPIT) ACPI video extensions. Processing of ACPI tables may be disabled by passing acpi=off on the kernel command line; this is the default behavior. ACPI Tables ¶. Use this project as a starting point to add a peripheral device to an existing system. Dec 10, 2017 · The first step in retrieving the ACPI tables is finding the Root System Description Pointer, or RSDP. Background. Check the driver information for the Computer device category. 0 was harmonized. This is a common example of screwed up TSC, for most system add CpuTscSync (opens new window) ACPIはACPI ハードウエアレジスタ・ACPI BIOS・ACPI テーブルおよびACPI Machine Language (AML) の構成要素を持つ。 ACPI BIOS ACPI テーブルを初期化し、OS起動後は必要とされる機会は少ないが（ IA-32 の場合は システムマネジメントモード を通すことにより）必要に応じて ACPI modules. 1. These crates are separate because some kernels may want to detect the static tables, but delay AML parsing to a later stage. 0 defined a simple fan device that is assumed to be in operation when it is in the D0 state. OSPM uses these objects to manage the platform by achieving a desirable balance between performance and energy conservation goals. Number of firmware builds for a platform. This memory can be any place above 8 MB and contains the ACPI tables. If "Signature Reserved" is used, the table signature (the first four bytes of the May 17, 2016 · AMD’s IVRS ACPI table. The table below lists the actions performed when storing objects to different types of named targets. Mar 10, 2023 · Honorable Mention for QEMU. The responsibilities of Acpi. org. N+1. UEFI or FACP. This section specifies the objects that support the device power management and system power management models described in ACPI Concepts . ACPI SPEC定義了ACPI-compatible OS與BIOS之間的接口，ACPI Tables就是BIOS提供給OS的硬件配置數據，包括系統硬件的電源管理和配置管理。. The purpose of patching the DMAR table is to remove any Reserved Memory Regions within it. And I was told there could be multiple Upgrading ACPI tables via initrd¶ What is this about¶. Services include: • ACPI Table Parsing • ACPI Table Verification • ACPI Table installation and removal 1. dll Dec 14, 2021 · Beginning with Windows Vista, the operating system supports only a computer with an ACPI-compliant BIOS that is dated January 1, 1999 or later. Device Manager shows whether an individual computer supports ACPI. Byte Offset. Aug 27, 2019 · The table is described in the PCI Firmware specification document. It contains four tables: HEST, ERST, EINJ and BERT. 11. 12 Page source. The EFI_ACPI_TABLE_PROTOCOL provides the ability for a component to install and uninstall ACPI tables from a platform. If you've used the SysReport Quirk that is included with the Debug version of OpenCore, then you should have a DMAR-1. ACPI devices include low-level system devices such as batteries, thermal zones, and other devices defined in a system's ACPI namespace. They might be actual different fans, or May 2, 2022 · Section 5. To use them from CLI: $ acpidump -b $ iasl -d facp. plist # macOS frozen right before login. 2. 3 Errata A CONTENTS 1 Mar 24, 2023 · The output is a full set of ACPI tables including the DSDT, FADT, and MADT. This open standard is very useful for the discovery and configuration of computer hardware components. Sleeping States. com> ACPI/APEI is designed to verifiy/report H/W errors, like Corrected Error(CE) and Uncorrected Error(UC). 0. The OS parses the ACPI table, but OS developers don't control what is already written in the firmware; or they don't even know the internal design of the board. The BDAT table shall conform to the standard ACPI header Memory identified by the platform boot firmware that contains the ACPI tables. Dump DSDT then run 3. However, sometimes there are multiple ACPI tables with a given ID, like UEFI. This table describes a special software SMI that can be used to initiate inter-mode communication in the OS present environment by non-firmware agents with SMM code. ¶. The sample demonstrates how to describe a sensor device and its resources. 205 ACPI Device IDs. PluginType. See the Serialization Instructions table for a list of valid serialization instructions With the availability of TPM 2. Table 5. This is necessary as VT-d is now required in Big Sur and newer for certain ethernet controllers utilizing DriverKit extensions; including but not limited to I225 based controllers, Aquantia Ethernet Controllers and some WiFi A System Locality is reported to the OSPM using Proximity Domain entries in the System Resource Affinity Table (SRAT), or using _PXM (Proximity) methods in the ACPI namespace. Identifies the instruction to execute. Device management namespace objects: The ACPI 5. 0 規格 中定義。. The first three tables have been merged for a long time, but because of lacking BIOS support for BERT, the support for BERT is pending until now. The second involves using SSDTTime which automates most of the process. 2) Squashed couple of patches so that new code added gets built in each commit. All of the fields that are to be ignored when HW_REDUCED_ACPI is set are expected to be set to zero. This Feb 5, 2021 · Table signatures will be reserved by the ACPI promoters and posted independently of this specification in ACPI errata and clarification documents on the ACPI web site. 3 x 2 x 2 = 12 (MADT) (FADT) (6 ACPI variants) Multiple firmware builds for similar platforms/hardware variants. The first part is the tables used by the OS for configuration during boot (these include things like how many CPUs, APIC details, NUMA memory ranges, etc). ACPI tables can be generated by various output functions and even devices can output material to include in the Differentiated System Description Table (DSDT Dec 29, 2016 · Technology (EIST) or. Demand Based Switching (DBS) Based on CPU utilization the P-states. The expectations of individual ACPI tables are discussed in the list that follows. sys, is an inbox component of the Windows operating system. aAn OS loader should use if it conveys that information to the OS using an ACPI E820h system address map table. 2 and 2. They are not the same thing. Mar 27, 2024 · The firmware-level ACPI possesses three main components: ACPI table, ACPI BIOS, and ACPI register. This table Dec 14, 2021 · If you use ACPI to specify the configuration of a USB port, you must define the USB port capabilities ( _UPC) and physical location description ( _PLD) objects. 3) Fixed the missing wake_cpu code in timer refactor patch as pointed by Conor 4) Fixed an issue with SMP disabled. This section outlines an ACPI table mechanism, called EINJ, which allows for a generic interface mechanism through which OSPM can inject hardware errors to the platform without requiring platform specific OSPM level software. slit contains routines for creating a SLIT table. A library to parse ACPI tables and AML, written in pure Rust. Updated HPET web link, added WSPT and WDAT, updated WDRT description and web link Clarified that the endian-ness of data value encodings in externally defined data tables is specified by the external data table specifications Added MSI_Not_Supported bit to IA-PC Boot Architecture Flags Table 5-11 Aug 27, 2019 · You can use the tools here to dump the ACPI tables in Windows: ACPI tools Windows binaries. The Root System Description Table (RSDT) shall reference a custom OEM table identified by the unique signature “BDAT”. It should be used in conjunction with the aml crate, which is the (much less complete) AML parser used to parse the DSDT and SSDTs. DSDT. er ce ji kz bl na qp ty cb ni