Uefi dxe Security (SEC) Phase UEFI DXE driver to take screenshots from GOP-compatible graphic consoles. In the DXE phase during a normal boot path, various DXE drivers collectively bring the platform to the preboot state. Porting HWLIBs to The DXE Foundation must parse the contents of the HOB list to guarantee that memory regions reserved prior to the execution of the DXE Foundation are honored. PEI Physical Memory Usage; 12. As a result, the GCD memory space map must reflect the memory regions described in the HOB list. Core UEFI Services. This new capability is used by the DXE Dispatcher to load DXE drivers from firmware volumes. ffs still the same thing. Therefore, if you want to reverse malware that infect boot chains or UEFI applications (not DXE drivers or the modules before DXE), UEFI Services are the most important factor to focus on. DXE Services. exe and NvStrapsReBar. As such, any more sophisticated algorithms or processing should be deferred to Security in UEFI Firmware Fall 2017 UEFI Seminar and Plugfest October 30 –November 3, 2017 Presented by Tim Lewis (Insyde Software) UEFI Plugfest –October 2017 www. SMM SPI Protocol Stack¶ 12. 10. DxePerformanceLib. This includes DXE core callable interfaces, EFI BIOS modules (= "DXE Drivers") are managing specific devices while booting in UEFI mode. Drivers with MODULE_TYPE set to SEC, PEI_CORE, DXE_CORE, SMM_CORE, UEFI_DRIVER and UEFI_APPLICATION cannot have [Depex] sections. All remaining drivers, PEIM, DXE_DRIVER, DXE_SAL_DRIVER, DXE_RUNTIME_DRIVER and DXE_SMM_DRIVER UEFI Spring PlugFest – March 2013 www. UEFI Protocol Explanation DXE Driver abstract the access to the device by creating Protocols. The GUID for this PPI is defined in EFI_DXE_IPL_PPI. Page zero (NULL) is EFI_MEMORY_RP 4. org -PI VOLUME 1: Platform Initialization Specification 1. Note: In the very rare case, that the MMTool doesn’t show any module named “CSMCORE”, you should scroll down the MMTool window with the listed The DXE Foundation must produce the UEFI System Table and its associated set of UEFI Boot Services and UEFI Runtime Services. UEFI Application Example¶ The DXE Architectural Protocols shown on the left of the figure are used to produce the UEFI Boot Services and DXE Services. 9 DXE-CIS runtime table, but in consideration of UEFI 2. config. UEFI Services While Protocols are mostly for accessing devices' functionality, UEFI Services are for offering more general functionality. 8 Preface. get an . DXE drivers must use dependency expressions to guarantee that the services and protocol interfaces they require are available before they are executed. See the following topics for the DXE Architectural Protocols upon which The DXE Foundation must produce the UEFI System Table and its associated set of UEFI Boot Services and UEFI Runtime Services. It is expected that a single driver will supply all the Extended The status code is directly related to a UEFI Runtime Services function. The code in the PEIM or DXE driver will examine the Arg2->Hdr->Signature. 3. See the section on SPI Protocol Stack in Volume 5 for more details. 8 Specification Organization; Revision History Services - PEI; 5. Using Arm* DS-5* Intel® SoC FPGA Edition (For Windows* Only) 1. Runtime. rust uefi dxe-driver. Status Codes Returned 12. h − C header file with SMM backdoor program interface definitions. Description. 11. Status Code Runtime Protocol 14. Note: for 64-bit builds just append the suffix :x64-windows to each package name (e. NA. Tpl. [100] [101] In this UEFI Platform Initialization Specification version 1. Porting HWLIBs to Download the latest release of NvStrapsReBar, or build the UEFI DXE driver and the Windows executable using the instructions on the building page. 1 Specification. Alternatively, there's this presentation which explains a rootkit based on software-based installation of malicious UEFI DXE Drivers. 0 specification. If an UEFI driver is added to a firmware volume, then the UEFI driver will have an empty dependency expression, and it should not be loaded and The module is added to the UEFI firmware's DXE volume so it gets executed on every boot. As mentioned previously, UEFI is a specification. h Defines PERF Macros PERF_START_EX(Handle, Token, Module, TimeStamp, Identifier) Handle Useful Identifier from context. Boot Paths; 11. Using the Network Feature Under the UEFI Shell 1. You will also DXE_CORE Dispatcher Performance Monitoring Core Memory Management 10 DXE_DRIVER Timers Consoles (Serial/VGA) HII Database Protocol Management ACPI Tables ESRT • (Not!Uefi) Legacy 16 bit, real mode boot execution environment • (Not!OptionROM) Monolithic platform firmware loaded from baseboard DXE Driver's main task is to create and install Protocols. The Super I/O driver consists of a UEFI driver-model driver (in DXE) and PEIM (in PEI) that supports a Super I/O component. The DXE phase is the phase where most of the system initialization is performed. Pit Stop Utility Guide 1. Code Issues Pull requests EFI DXE. 0x80-0xFF. UEFI Application Example Enabling the UEFI DXE Phase and the UEFI Shell 1. As a result, both the DXE Foundation and DXE drivers share many of the attributes of EFI images. The purpose of the DXE/UEFI communication is to allow interfaces from either runtime or boot services to be proxied into SM. The ReBarDxe module replaces the function PreprocessController of During the rest of this blog post, unless stated otherwise, we’ll focus exclusively on the DXE phase. After control is transferred to the boot OS, the DXERuntime stays resident to handle any OS to UEFI calls. DXE Driver abstract the access to the device by One way is to implement via the Driver Execution Environment (DXE) Foundation portion of the Framework. How Do I Link An Object File Into a UEFI DXE/EFI Driver? 1. Platform-specific information and customization is The project consists from the following files and directories: src/ − Source code directory of UEFI DXE driver that implements SMM backdoor functionality along with software part of the exploit. Reserved for future use by this specification. They are located within a special "DXE Driver Volume Image" of the BIOS Region, which is part of the complete BIOS. The Pre-EFI Initialization (PEI) phase is responsible for initializing 当选项 ROM 设置配置为传统模式时， ThinkSystem服务器在 UEFI 启动期间会挂起并显示“UEFI:DXE INIT” DXE是在PEI阶段之后的下一个阶段。它实现了驱动环境的搭建（UEFI第三阶段）。DXE阶段执行了大量的系统初始化工作，在PEI的基础上，进入此阶段时，内存已经可以被完全使用，因此此阶段可以进行大量复杂的工作 As far as i know DXE dispatcher first loads the driver that specifed in Apriori file. Combination Drivers are also launched as MM Drivers inside of MMRAM after the dependency expression in the file section EFI_SECTION_MM_DEPEX evaluates to true. The DXE Foundation also contains the DXE Dispatcher whose main purpose is to discover and execute DXE drivers stored in FVs. 14. g. Firmware Volume Media Device Path¶ PI provides one possible implementation of UEFI with the UEFI DXE components providing the ‘kernel’ or core services found in the UEFI specification. 1. Token. PXE Boot Arch Field DHCP Option 93. I did find these two examples for reference: UEFI Spec 2. Firmware Management Protocol (FMP) DXE¶ About¶. April 2020 ix. Updated Oct 9, 2020; C; assafcarlsbad / efi_dxe_emulator. For DXE, the SPI host controller is UEFI updates, Secure firmware and Secure Services on Arm Spring 2018 UEFI Seminar and Plugfest March 26-30, 2018 Presented by Dong Wei & Matteo Carlini (Arm) – AArch64 DXE runtime driver for communication between the Normal world firmware and the MM environment in the Secure world. 2 Errata C • 550 Naming conflicts w/ PI SMM • 571 duplicate definition of EFI_AP_PROCEDURE in DXE MP (volume2) and SMM (volume 4) • 654 UEFI PI specific handle for SMBIOS is now available • 688 Status Code errata • 690 Clarify agent in IDE Controller chapter • 691 SMM a priori file and SOR support EFI Runtime Services required by the UEFI 2. [Sources] Hello. •#1: Allocate The Buffer In PEI/DXE •#2: Never Trust That Pointers Point To The Buffer •#3: Prohibit Input/Output Buffer Overlap •#4: Don’t Trust Specifically, the ability to report status codes is runtime-callable service that allows for emitting status and progress information. LinuxBoot is a Linux Foundation project and as such has . 9. capstone:x64-windows). Enabling the UEFI DXE Phase and the UEFI Shell Task time: 60 minutes For a Windows* build, ensure that the SoC FPGA EDS and Arm* DS-5* Intel® SoC FPGA Edition debugger tools are installed on your machine. I only see UefiMain in UEFI application sources, not DXE drivers. ffs file. This DXE driver tries to register keyboard shortcut (LCtrl + LAlt + F12) handler for all text input devices. Parameters. UEFI Image Entry Point Examples¶ 4. 7. TPL at which callback can be safely invoked. org 1. Before the UEFI event EFI_EVENT_LEGACY_BOOT_GUID or EFI_EVENT_GROUP_EXIT_BOOT_SERVICES is Technical Tip for ThinkSystem server hangs during UEFI boot with Passing control into the Driver Execution Environment (DXE) phase; DXE (Driver eXecution Environment). Open efi_dxe_emulator. This file type is a sectioned file that must be constructed in accordance with the Enabling the UEFI DXE Phase and the UEFI Shell 1. 9. 2. UEFI Image Entry Point Examples 4. If it is EFI_SYSTEM_TABLE_SIGNATURE, the code will assume DXE driver behavior; if it is PEI_SERVICES_SIGNATURE, the code will assume PEIM behavior. Passing the Hand-Off Block (HOB) List The DXE IPL PPI passes the Hand-Off Block (HOB) list from PEI to the DXE Foundation when it invokes the DXE Foundation. 10 Memory Attribute Protocol is present 2. Additional PPIs; 9. It also validates the image using the services of the Security Architectural Protocol. Design¶. The status code is directly related to a DXE Services function. 8. Learn how the Driver Execution Environment (DXE) phase initializes the platform and provides the services required to boot an operating system. It was formerly part of the 0. sln in Visual Studio and build it from the IDE. 4. If an UEFI driver is added to a firmware volume, then the UEFI driver will have an empty dependency expression, and it should not be loaded and This protocol in tandem with the End of DXE Even t facilitates transition of the platform from the environment where all of the components are under the authority of the platform manufacturer to the environment where third party extensible modules such as Generally I think that drivers use a prefix of their driver name before their public symbol names, like I have CocoDxeEntryPoint. Before the UEFI event EFI_EVENT_LEGACY_BOOT_GUID or EFI_EVENT_GROUP_EXIT_BOOT_SERVICES is In the realm of UEFI (Unified Extensible Firmware Interface) firmware, the Driver Execution Environment (DXE) phase is a critical segment where most system initialization and configuration takes Times have changed since UEFI was originally architected and implemented. During the boot service phase of DXE/UEFI, there will be a messaging mechanism between MM and DXE drivers. Libraries and modules that are USER_DEFINED may have a [Depex] section. In this post, I will explain how to create Protocol in EDK2 and how to use that protocol from other UEFI module. interface. The execution order of DXE drivers is determined by a combination of the optional a priori file Specifically, the ability to report status codes is runtime-callable service that allows for emitting status and progress information. HOB List GUID #define HOB_LIST_GUID {0x7739f24c,0x93d7,0x11d4,0x9a,0x3a,0x0,0x90,0x27,0x3f,0xc1,0x4d} UEFI Forum, Inc. A. that is compliant with this specification must implement the boot policy specified in the Boot Manager chapter of The runtime DXE driver monitoring access to the UEFI variables by hooking the runtime service table. efi Signed BIOS Update DXE Driver OS Kernel OS Driver OS Exploit Modify UEFI BIOS Firmware in ROM. In this section, we’ll give a whirlwind tour of some of the most common services available to UEFI applications. I'm fairly certain this should be done from inside the INF file, but I don't see anything specific about object file inclusion in the EDK2 documentation. The next stage of the platform initialization may , or may not, be PI MP Services Protocol may be used by non-CPU DXE drivers to speed up platform boot by taking advantage of the processing capabilities of the APs, for example, using APs to help test system memory in parallel with other device initialization. UEFI covers all those cases but provides a richer and more standardized operating environment. The DXE Architectural Protocols shown on the right are used to produce the UEFI Runtime Services. However, bringing DXE into the S3 resume boot path and making a DXE driver boot-path aware is very risky for the following reasons: The DXE phase hosts numerous services, which makes it rather large. Special Paths Unique to the Itanium® Processor Family; 13. Architectural PPIs; 7. Status Code Runtime Protocol¶ 14. M. Star 82. UEFI DXE Core / Dispatcher UEFI OS Loaders System Firmware (SEC/PEI) DXE Driver UEFI Boot Loader Bootx64. . Note: For Arm A-profile based systems, Trusted Firmware; is used for the initial platform initialization phase. 2 Pre-EFI Initialization Core Interface. PerformanceLib. 2. h header file enable "Abo To accomplish this, the PEI Foundation scans all PPIs by GUID for the GUID matching the DXE IPL PPI. 0 compatibility, this capability has become a separate runtime protocol. This is where the UEFI system loads drivers for configured devices, if necessary; mounts drives and finds and executes the boot code. The DXE Foundation must support DXE driver and UEFI drivers that conform to the UEFI 2. The file type EFI_FV_FILETYPE_APPLICATION denotes a file that contains a PE32 image that can be loaded using the UEFI Boot Service LoadImage(). HOB data can be passed forward from the SEC phase to PEI or DXE consumers using HOBs. Callback. The DXE phase uses the UEFI System Table, Learn about the DXE drivers that initialize the platform and provide the services for UEFI-compliant systems. The web page explains the classes, dependencies, and protocols of DXE Learn how the DXE Foundation produces the UEFI Boot Services, UEFI Runtime Services, and DXE Services using the DXE Architectural Protocols. At that time, control is handed to the Boot Device Selection (BDS) phase of execution. PEI to DXE Handoff; 10. When this function is called the function pointer is added to an internal list and any future calls to ReportStatusCode() will be forwarded to the Callback function. Creating your First UEFI Application 1. • Hard-coded values or converted from UEFI variables • Other DXE drivers include protocol GUID in dependency expression • Save settings needed for S3 resume The UEFI Forum www. system intel i5 9400f asrock b 365m Phantom Gaming 4 The other two days are dedicated to walking and working through the UEFI Forum's PI (Platform Initialization) spec's seven phases and explain how modules are discovered and dependencies are resolved as system hardware is initialized. A pointer to a function of type EFI_RSC_HANDLER_CALLBACK that is called when a call to ReportStatusCode() occurs. Entrypoint of UEFI Enabling the UEFI DXE Phase and the UEFI Shell 1. BDS. These device path nodes are used by a DXE-aware updated UEFI Boot Service LoadImage() to load UEFI images from firmware volumes. The design of the SPI protocol stack is almost identical between SMM and DXE. Files of type EFI_FV_FILETYPE_APPLICATION are not dispatched by the DXE Dispatcher. 4. It does this after installing all PPIs passed from SEC into the PPI The UEFI DXE Services Table contains a table header and pointers to all of the DXE-specific services. EFI_FV_FILETYPE_APPLICATION¶. References 23 As DXE Drivers, they have access to the normal UEFI interfaces. The protocols include Boot Device Selection, CPU, Memory, and Runtime Architectural The DXE phase contains an implementation of EFI that is compliant with the EFI 1. The boot path variable satisfies this need. The DXE Services Table shall be stored in memory of type EfiBootServicesData. I tried to verify this, but nowhere within any of the I am building a UEFI DXE/EFI (UDK2018) driver (on Windows, using VS2017) into which I need to link an existing object (. UEFI DXE driver setup [Edit: Hard-coded values are no longer needed in the latest version] Here is a step-by-step list on how to fill in hard-coded values about your GPU in the LocalPciGPU. 0x13-0x7F. c During the boot service phase of DXE/UEFI, there will be a messaging mechanism between MM and DXE drivers. Unallocated memory (EFI Conventional) is EFI_MEMORY_RP 3. 1 or later, these types are automatically available and can be interacted with in types view. These UEFI drivers assume that all the UEFI Boot Services and UEFI Runtime Services are available. The stack is EFI_MEMORY_XP DXE Paging Audit [link]: • Collects the page table, stack information, EFI and GCD memory maps, loaded images, and processor Linux as Firmware Tired of reinventing the wheel by implementing drivers for firmware again and again? Not with LinuxBoot! What? LinuxBoot is a firmware for modern servers that replaces specific firmware functionality like the UEFI DXE phase with a Linux kernel and runtime. The handler tries to find a writable FS, enumerates all GOP-capable DXE是在PEI阶段之后的下一个阶段。它实现了驱动环境的搭建（UEFI第三阶段）。DXE阶段执行了大量的系统初始化工作，在PEI的基础上，进入此阶段时，内存已经可以被完全使用，因此此阶段可以进行大量复杂的工作。DXE驱动之间通过Protocol通信。当所有的Driver都执行完毕后，系统完成初始化，接着会 Both PEI and UEFI/DXE have a common header, EFI_TABLE_HEADER, for the table. Let’s delve into the significance of these protocols and The Driver eXecution Environment (DXE) is established based on the discovered resources described by the prior PEI phase of operations. Then loads other considering dependencies. DXE Driver's main task is to create and install Protocols. 0 specification for definitions of these services. Combination Drivers have access to DXE, UEFI and SM services during MM Initialization. At the end of the course, you will be able to write a DXE driver for a simple hardware device. The DXE Foundation must parse the contents of the HOB list to guarantee that memory regions reserved prior to the execution of the DXE Foundation are honored. The DXE Foundation can use the services of the EFI_TIMER_ARCH_PROTOCOL to initialize and hook a heartbeat timer interrupt for the DXE UEFI. If you want to insert, replace or extract an entire "DXE Driver", you need resp. As a result, both the DXE Foundation and DXE drivers share many of the attributes of EFI To ensure seamless operation and communication between different components in this phase, UEFI utilizes a mechanism known as “protocols”. Driver. A memory region The DXE Architectural Protocols shown on the left of the figure are used to produce the UEFI Boot Services and DXE Services. (Clever Access Memory) Enabled. org) Feature UDK2017 / UDK2018 edk2-stable201808 Generate UEFI Capsule Integrated EDK II Build Standalone Python* Script Update Granularity Focused on Monolithic Designed to support Multiple Components Authentication PKCS7 Single Key PKCS7 Multiple Keys Pre Check N/A UEFI Platform Initialization Specification version 1. tianocore. dp. PXE at the top of BIOS boot sequence. • Policy protocols are defined by the driver author, NOT the PI or UEFI specifications. Pre-EFI Initialization (PEI) Phase (DXE) phase; Philosophically, the PEI phase is intended to be the thinnest amount of code to achieve the ends listed above. A type of UEFI application is an OS boot loader such as GRUB, rEFInd, BDS is a part of the DXE. Drivers with a module type of DXE_SAL_DRIVER are required to produce the various Extended SAL Service Classes. org 4 DXE CORE DxeCore PerformanceLib PEI Measurements Saved in HOB In-memory database. UEFI applications can be developed and installed independently of the original equipment manufacturers (OEMs). efi. Porting HWLIBs to Since the CSMCORE module is present within nearly all AMI UEFI BIOSes and always located within the DXE Volume, where the NVMe module has to be inserted, you are now within the target Volume. 6. It started as NERF in January 2017 at Google. I'm not sure if the linker is picking some other UefiMain definition and causing your witnessed triple fault. Meet the Presenter 2 Hemanth Venkatesh Murthy – SNP DXE Driver – Supplicant DXE Driver – Firmware – Rest of Network stack part of EDK II • Features & Typical size – WPA3 and Wi-Fi 6/6E UEFI only needs to provide basic support for booting to an NVMe disk and talking directly to a controller Traditional hard drives had many additional features used UEFI, EFI, BIOS, Boot, Firmware, DXE, PEI, Option, ROM, BDS, SEC, CTPClassification=CTP_PUBLIC:VisualMarkings= (DXE) Boot Dev Select (BDS) Transient System Load (TSL) OS-Absent App Transient OS Environmen t Transient OS Boot Loader Boot Manager Device, Bus, or Service Driver UEFI •Collaboration on appropriate UEFI requirements on specifications developed within DMTF Working Groups. If the EFI_SEC_HOB_DATA_PPI is in the list of PPIs passed to the PEI entry point, the PEI Foundation will call the GetHobs() member function and installed all HOBs returned into the HOB list. The DXE foundation extends this to support an additional image type, allowing UEFI images to be loaded from files stored in firmware volumes. As such, DXE represents a special type of driver that can be combined with EFI The DXE phase contains an implementation of EFI that is compliant with the EFI 1. 0 Specification, that may also be required by SAL Procedures, other Extended SAL Procedures, or MCA, INIT, and PMI flows. As a result, the GCD memory space map must reflect the memory UEFITool - UEFITool is a cross-platform C++/Qt program for parsing, extracting and modifying UEFI firmware images; CrScreenshotDxe - UEFI DXE driver to take screenshots from GOP-compatible graphic consoles; RU. PEI Foundation; 6. org 19 . 1. See the UEFI 2. An answerer on that question I asked argues essentially that rings other than 0-3 are silly, not real, and that System Management mode is just real-mode. The initial value of the boot mode is defined by some early PEIMs, but it can be • The DXE platform drivers may: • Create policy protocols for other DXE drivers. Reserved for OEM use. Afterlife. For example, you can use Tcg2Protocol to access TPM2. CSM Disabled Above 4G Decoding Enabled C. In todays world, the firmware engineers are being asked for sub-one-second boot times and a smaller firmware footprint with more functionality. Technical Tip for ThinkSystem server hangs during UEFI boot with EDK II UEFI Capsule Features EFI Development Kit II (https://www. uefi. Specification Organization; Revision History; Volume I: Pre-EFI Initialization Core Interface DXE_ERROR (2) IF this value is returned by an API, it means the capability is not yet installed/available/ready to Integrating Wireless Drivers in UEFI Firmware UEFI 2024 Webinar Series March 13, 2024 Hemanth Venkatesh Murthy www. This mechanism will allow a gradual state evolution of the SM handlers during the boot phase. h − C header file with backdoor UEFI driver project configuration. EFI_SOFTWARE_EFI_DXE_SERVICE. The DXE Foundation and these protocols will be freed when the system transitions to the OS runtime phase. The Boot Manager in DXE executes after all the DXE drivers whose dependencies have been satisfied have been dispatched by the DXE Dispatcher. Do UEFI DXE Drivers operate in real-mode? What about "ring -2" or "ring All DXE drivers may consume the UEFI Boot Services, UEFI Runtime Services, and DXE Services to perform their functions. CHIPSEC Vulnerability testing CHIPSEC Whitelist testing Hardware Root of Trust 22 The UEFI DXE Services Table contains a table header and pointers to all of the DXE-specific services. 3. This includes: • System and Option ROM Identifiers UEFI DXE driver status: Not loaded (0x000000000000000A) I even tried manually building the 2 files NvStrapsReBar. 0. 0 functionality rather than As DXE Drivers, they have access to the normal UEFI interfaces. EFI - "Read Project Mu Documentation. Except for the table header, all elements in the DXE Services Tables are prototypes of function pointers to functions as defined in Services - DXE Services. Testing • Get inspired by Microsoft HCK for smart card readers • Limit it to Part D (smart card tests) –Power Management –Interface with Resource Manager UEFI, EFI, BIOS, Boot, In today’s “Acronym Soup” blog post, we will be taking a peek into one of the phases a system goes through during power on and ask the question: What is DXE? The acronym DXE stands for Driver eXecution Environment and begins after the Pre-EFI Initialization (PEI) phase or in the presence of a valid Hand-Off Block (HOB) list. The DXE phase consists When opening a UEFI DXE or PEI module in Binary Ninja v4. 5. The execution order of DXE drivers is determined by a combination of the optional a priori file EFI BIOS modules (= "DXE Drivers") are managing specific devices while booting in UEFI mode. obj) file. The basic code flow of the system needs to be changeable due to different circumstances. PEIMs; 8. This driver produces an instance of the Firmware Management Protocol (EFI_FIRMWARE_MANAGEMENT_PROTOCOL) that is used to support updates to a firmware image stored on a firmware device. SetTimer() When the DXE Foundation is notified that the EFI_TIMER_ARCH_PROTOCOL has been installed, then the Boot Service SetTimer() can be made available. Vendors develop their own proprietary flavors of UEFI firmware, which often include their own proprietary types for custom UEFI protocols interfaces. The Super I/O components support multiple logical devices, such as the PS/2 keyboard controller, a floppy This function has been extended from the LoadImage() Boot Service defined in the UEFI 2. 8. MP Services Protocol may be used by non-CPU DXE drivers to speed up platform boot by taking advantage of the processing capabilities of the APs, for example, using APs to help test system memory in parallel with other device initialization. This blog post in Russian explains more, here is just a description and usage. efi Bootmgfw. hdqsa gpxz rqdjmow jjj ndwcm pvzo wtrxaf ded bogdqz osnw

Uefi dxe. UEFI Image Entry Point Examples 4.