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Kernel: Moorestown, Nintendo 64, Corellium and Oracle

Submitted by Roy Schestowitz on Tuesday 26th of January 2021 10:53:45 PM Filed under
Linux
  • Linux Says Farewell To Intel's Smartphone Attempts With Clearing Out Moorestown / Medfield

    Not only are some old ARM platforms and some obsolete, obscure CPU architectures on the chopping block for some spring cleaning in the Linux kernel, but the Intel Moorestown and Medfield "Mobile Internet Device" platforms are being phased out from the Linux kernel this spring as well.

    Moorestown was Intel's early Atom platform geared for handheld mobile Internet devices and smartphones.

  • With Linux 5.12 Set To Boot On The Nintendo 64, The N64 Controller Driver Is Now Queued - Phoronix

    A few days ago we wrote about Linux 5.12 to see support for the Nintendo 64 more than two decades after that MIPS-based video game console first shipped. While the practicality of Linux on the Nintendo 64 is particularly limited given only 4~8MB of RAM and the MIPS64 NEC VR4300 clocked under 100MHz, it's going upstream and now the N64 controller driver is also queued for this next kernel cycle.

    The code talked about a few days ago was getting Linux to boot on the Nintendo 64. With those 200+ lines of code in the MIPS architecture space is enough to get Linux booting on the Nintendo 64 when using a Flashcart device to be able to load the arbitrary code onto the game console.

  • Corellium to offer cloud-based iOS virtualisation to individual accounts

    The company, which only recently ported Ubuntu Linux to work on Apple Silicon Macs, has announced on their blog that they will now offer their virtualisation tools for iOS to individual accounts on their CORSEC platform. Previously, only enterprise accounts could access the service, while individuals could only access virtual Android devices.

  • Getting started with SystemTap on Oracle Linux

    There are a wealth of tools available for tracing and debugging the Linux kernel on a live system. These include Kprobes, Ftrace, trace-cmd, Dtrace, eBPF, SystemTap, crash, gdb, etc. Among these tools, few allow the user to develop and re-use scripts that can filter events and collect data more than just function arguments and returned values. Dtrace, eBPF and SystemTap are the ones among these tools that do.

  • Anticipating Your Memory Needs

    The Linux kernel organizes physical memory in units of pages of a certain size called base pages. For example, the default base page size when running on Intel processors is 4KB. These pages are allocated to user and kernel tasks as they need memory. When processing large amounts of data from slower disk devices, the Linux kernel uses a page cache to cache contents, like disk blocks, to speed up access to frequently accessed data. See this article for more details on how various caches are used by the Linux kernel. This has the positive effect of improving overall system performance but the memory for page cache must come from the same memory pool that is used by rest of the system. The kernel allocates all the memory not currently in use to the page cache. As the kernel needs to allocate more memory for other tasks, it can reclaim pages from the page cache since the contents in the page cache can be restored from disk blocks when the need arises. Reclamation happens as the kernel starts to run low on free memory pages. Individual memory pages are the base pages. As pages are reclaimed, any contiguous base pages are grouped together (compaction) to form higher order pages. Higher order pages are groups of 2^n physically contiguous pages where n is the page order. Higher order pages can then be used to satisfy higher order page allocation requests, for example if an allocation request is for 8 pages, that allocation will be made from order 3 page group.

    The kernel recovers physical memory in the event of a shortage by page reclamation and/or compaction. Both methods are implemented in a similar fashion. As the amount of free memory falls below the low threshold (watermark), memory pages are reclaimed asynchronously via kswapd or compacted via kcompactd. If the free memory continues to fall below a minimum watermark, any allocation request is forced to perform reclamation/compaction synchronously before it can be fulfilled. The latter synchronous method is referred to as the "direct" path and is considerably slower owing to being stalled waiting for memory to be reclaimed. The corresponding stall in the caller results in a non-deterministic increased latency for the operation it is performing and is typically perceived as an impact on performance.

»

Linux on Apple M1 Project Reveals New Details About M1 System

Submitted by Roy Schestowitz on Thursday 4th of February 2021 11:36:31 PM.
  • Linux on Apple M1 Project Reveals New Details About M1 System Architecture

    Corellium, a software company specializing in virtualization solutions, has managed to port Linux to an Apple M1-based PC and even succeeded in making almost all the system peripherals work. In the process, Corellium discovered several interesting details about Apple’s M1 processor and the system architecture.

    A couple of weeks ago, we reported that a startup called Corellium had managed to run Linux on an Apple M1-based computer. Back then, the operating system ran, but it did not support many things, essentially making the PC unusable to a large degree. Recently the company finally managed to make most of the things (including Wi-Fi) work, which means that Linux can now be used on the latest Macs. But the whole project of running a non-Apple OS on such computers has an interesting side effect as it reveals how different Apple’s SoCs are compared to other Arm-based architectures.

New Patches Posted For Bringing Up The Apple M1 SoC On Linux

Submitted by Roy Schestowitz on Friday 5th of February 2021 02:24:25 AM.

  • New Patches Posted For Bringing Up The Apple M1 SoC On Linux

    Security firm Corellium has been working on enabling the Apple M1 SoC under Linux and last month they posted initial Linux kernel patches for the Apple M1. Meanwhile independent developer Hector Martin has also been working on Apple M1 enablement via crowdfunding and today he posted his initial set of Linux kernel patches for bringing up the Apple 2020 hardware under Linux.

    Hector Martin today posted a set of 18 patches as part of his initial bring-up work for the Apple M1 SoC with a focus on the 2020 Apple Mac Mini, MacBook Pro, and MacBook Air models that use this Apple Silicon. This initial work focuses on UART, interrupts, SMP, and DeviceTree support. There is also a SimpleFB-based frame-buffer implementation for a working albeit un-accelerated display. The DeviceTree is focused on the Apple Mac Mini 2020 model but should be working for the most part with the MacBook Air and MacBook Pro too.

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