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IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses. Translation structures are hierarchical and four levels deep. The current implementation supports regular 4KB and 1 GB and 2 MB large page mappings. Memory typing is not yet implemented since the encoded type bits depend on the active page attribute table (PAT)*. For detailed information refer to Intel SDM Vol. 3A, section 4.5. * The default PAT after power up does not allow the encoding of the write-combining memory type, see Intel SDM Vol. 3A, section 11.12.4. * Add common IA-32e paging descriptor type: The type represents a table entry and encompasses all fields shared by paging structure entries of all four levels (PML4, PDPT, PD and PT). * Simplify PT entry type by using common descriptor: Differing fields are the physical address, the global flag and the memory type flags. * Simplify directory entry type by using common descriptor: Page directory entries (PDPT and PD) have an additional 'page size' field that specifies if the entry references a next level paging structure or represents a large page mapping. * Simplify PML4 entry type by using common descriptor Top-level paging structure entries (PML4) do not have a 'pat' flag and the memory type is specified by the 'pwt' and 'pcd' fields only. * Implement access right merging for directory paging entries The access rights for translations are determined by the U/S, R/W and XD flags. Paging structure entries that reference other tables must provide the superset of rights required for all entries of the referenced table. Thus merge access rights of new mappings into existing directory entries to grant additional rights if needed. * Add cr3 register definition: The control register 3 is used to set the current page-directory base register. * Add cr3 variable to x86_64 Cpu Context The variable designates the address of the top-level paging structure. * Return current cr3 value as translation table base * Set context cr3 value on translation table assignment * Implement switch to virtual mode in kernel Activate translation table in init_virt_kernel function by updating the cr3 register. * Ignore accessed and dirty flags when comparing existing table entries These flags can be set by the MMU and must be disregarded. |
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base | ||
base-codezero | ||
base-fiasco | ||
base-foc | ||
base-host | ||
base-hw | ||
base-linux | ||
base-nova | ||
base-okl4 | ||
base-pistachio | ||
dde_ipxe | ||
dde_linux | ||
dde_oss | ||
dde_rump | ||
demo | ||
gems | ||
hello_tutorial | ||
libports | ||
os | ||
ports | ||
ports-foc | ||
README |
=============================== Genode source-code repositories =============================== This directory contains the source-code repositories of the Genode OS Framework. Each sub directory has the same principle layout as described in the build-system manual: :Build-system manual: [http://genode.org/documentation/developer-resources/build_system] The build system uses a configurable selection of those reposities to obtain the source codes for the build process. The repositories are not independent but build upon of each other: :'base': This directory contains the source-code repository of the fundamental frameworks and interfaces of Genode. Furthermore, it contains the generic parts of core. :'base-<platform>': These directories contain platform-specific source-code repositories complementing the 'base' repository. The following platforms are supported: :'linux': Linux kernel (both x86_32 and x86_64) :'nova': NOVA hypervisor developed at University of Technology Dresden See [http://genode.org/documentation/platforms/nova] :'foc': Fiasco.OC is a modernized version of the Fiasco microkernel with a completely revised kernel interface fostering capability-based security. It is not compatible with L4/Fiasco. See [http://genode.org/documentation/platforms/foc] :'hw': The hw platform allows the execution of Genode on bare ARM hardware without the need for a separate kernel. The kernel functionality is included in core. See [http://genode.org/documentation/platforms/hw] :'okl4': OKL4 kernel (x86_32 and ARM) developed at Open-Kernel-Labs. See [http://genode.org/documentation/platforms/okl4] :'pistachio': L4ka::Pistachio kernel developed at University of Karlsruhe. See [http://genode.org/documentation/platforms/pistachio] :'fiasco': L4/Fiasco kernel developed at University of Technology Dresden. See [http://genode.org/documentation/platforms/fiasco] :'codezero': Codezero microkernel developed by B-Labs See [http://genode.org/documentation/platforms/codezero] :'host': Pseudo platform documenting the interface between the generic and platform-specific parts of the base framework. This is not a functional base platform. :'os': This directory contains the non-base OS components such as the init process, device drivers, and basic system services. :'demo': This directory contains the source-code repository of various services and applications that we use for demonstration purposes. For example, a graphical application launcher called Launchpad and the Scout tutorial browser. :'hello_tutorial': Tutorial for creating a simple client-server scenario with Genode. This repository includes documentation and the complete source code. :'libports': This source-code repository contains ports of popular open-source libraries to Genode, most importantly the C library. The repository contains no upstream source code but means to download the code and adapt it to Genode. For instructions about how to use this mechanism, please consult the README file at the top level of the repository. Among the 3rd-party libraries are Qt5, libSDL, freetype, Python, ncurses, Mesa, and libav. :'dde_linux': This source-code repository contains the device driver environment for executing Linux device drivers natively on Genode. Currently, this repository hosts the USB stack. :'dde_ipxe': This source-code repository contains the device-driver environment for executing drivers of the iPXE project. :'dde_oss': This source-code repository contains the device-driver environment for the audio drivers of the Open Sound System (OSS). :'dde_rump': This source-code repository contains the port of rump kernels, which are used to execute subsystems of the NetBSD kernel as user level processes. The repository contains a server that uses a rump kernel to provide various NetBSD file systems to Genode. :'ports': This source-code repository hosts ports of 3rd-party applications to Genode. The repository does not contain upstream source code but provides a mechanism for downloading the official source distributions and adapt them to the Genode environment. The used mechanism is roughly the same as used for the 'libports' repository. Please consult 'libports/README' for further information. :'ports-<platform>': These platform-specific source-code repositories contain software that capitalizes special features of the respective kernel platform. For the Fiasco.OC platform, 'ports-foc' hosts a port of the L4Linux kernel. For further information, please refer to the README file at the top level of the respective repository. :'gems': This source-code repository contains Genode applications that use both native Genode interfaces as well as features of other high-level repositories, in particular shared libraries provided by 'libports'.