t3hn3rd 0c96d32754 feature: move all USB HC drivers from polling to interrupt-driven completion
Replace main-loop polling (poll_all, poll_keyboards, poll_mice) with
hardware interrupt handlers for all four USB host controller drivers.

Each HC driver (XHCI, EHCI, OHCI, UHCI) now:
- Registers an ISR on its PCI interrupt line via isrmanager
- Enables hardware interrupts after HC initialization
- Acknowledges interrupt status in the ISR before calling poll,
  preventing interrupt storms on level-triggered PCI lines
- Uses a PollBusy re-entrancy guard to prevent ISR/inline poll races

usbcore gains a completion hook system (register_completion_hook /
fire_completion_hooks) so HID drivers (keyboard, mouse) are notified
directly from the ISR after transfer completion.

Files changed:
- usbcore.pas: completion hook infrastructure
- XHCI.pas: ISR, enable_interrupts, submit ordering fix
- EHCI.pas: ISR, enable_interrupts, status ack in ISR
- OHCI.pas: ISR, enable_interrupts, status ack in ISR
- UHCI.pas: ISR, enable_interrupts, status ack in ISR
- usb_keyboard.pas: register completion hook
- usb_mouse.pas: register completion hook
2026-03-02 13:36:40 +00:00
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2020-10-29 15:27:40 +00:00
2020-10-29 15:27:40 +00:00
2020-10-29 15:27:40 +00:00
ds
2017-05-20 18:25:38 +00:00
2026-02-26 12:23:42 +00:00
2021-06-22 23:42:43 +01:00
2026-02-27 16:30:31 +00:00
2025-03-15 10:52:08 +00:00
2021-07-06 19:18:23 +00:00
2021-07-06 19:18:23 +00:00
2021-07-06 19:18:23 +00:00
2021-07-06 19:18:23 +00:00
2026-02-27 16:30:31 +00:00
2021-07-06 19:18:23 +00:00
2026-03-01 21:23:33 +00:00
2021-07-06 19:18:23 +00:00
2025-03-09 19:39:25 +00:00
2026-02-27 16:30:31 +00:00
2021-06-22 20:55:23 +00:00
2026-02-27 16:30:31 +00:00
2021-06-22 20:54:58 +00:00
2025-03-09 13:01:10 +00:00
2020-10-29 15:35:00 +00:00

Asuro

We welcome everyone to give building/breaking/fixing/shooting Asuro a go, feel free to follow the steps below and mess with Asuro for fun or profit.

Setting up your build environment

Prerequisites

  • WSL2 WSL2 is used in conjunction with Docker to predefine a build environment for Asuro.
  • Docker for Windows Docker is used to ensure a predefined environment with the correct versions of; Freepascal, Binutils, NASM, Make, xorriso & grub-mk-rescue installed is used for compilation. An ISO will be generated at the end of the build process.
  • Git (Obviously) I don't think this needs an explaination.
  • VSCode (Optional, but highly recommended) Visual Studio code is our IDE of choice, and we have a number of recommended plugins.
    • PowerShell Plugin by Microsoft This plugin gives you the ability to use the 'PowerShell' task type, allowing the automatic launching of virtualbox with the resulting image generated during compilation of Asuro.
  • VirtualBox Virtualbox is our Virtualisation environment of choice, don't ask why, it just is.

Installation (correct as of 2021/06/20)

  1. Install WSL2 as described in the article linked above & ensure Virtualization is enabled in the BIOS.

  2. Ensure WSL2 is used by default with the following command:

    wsl --set-default-version 2
    
  3. Install Docker for Windows.

  4. Install Git for Windows.

  5. Install VSCode & the listed plugins.

  6. Install VirtualBox (v7+).

  7. Clone this repository.

  8. Run the following command in the root of the repo to build the docker image:

    docker compose build builder
    
  9. Run the following command to compile Asuro:

    docker compose run builder
    
  10. Create a new virtual machine in Virtualbox and mount the Asuro.iso generated in step 9 as a boot image.

  11. Add the virtualbox installation directory to your %PATH% environment variable, usually:

    %PROGRAMFILES%\Oracle\VirtualBox
    
  12. Naviage to your virtualbox machines folder, this is usually the following

    %userprofile%\VirtualBox VMs\<VM Name>
    

    Open the Virtual Machine Definition file (.vbox) in your text editor of choice and find the following line:

    <Machine uuid="{7d395c96-891c-4139-b77d-9b6b144b0b93}" name="Asuro" OSType="Linux" snapshotFolder="Snapshots" lastStateChange="2021-06-20T20:33:07Z">
    

    Copy the uuid, in our case 7d395c96-891c-4139-b77d-9b6b144b0b93 & create a localenv.json file in the project root with the following content:

    {
        "VirtualBox":{
            "MachineName":"<YOUR_UUID_OR_MACHINE_NAME>"
        }
    }
    

    This will allow VSCode to automatically launch VirtualBox once Asuro has been compiled.

    You can also enable the serial adapter "COM1" in mode "Raw File", give it a path, and provide this path in the localenv.json as follows:

    {
        "VirtualBox" : {
            "MachineName": "<YOUR_UUID_OR_MACHINE_NAME>",
            "LogLocation": "Fully\\Qualified\\Path\\To\\Your\\Log\\File"
        }
    }
    

    This will allow you to see the console output from Asuro in your host terminal.

  13. Open your project folder in VSCode, use CTRL+SHIFT+B to build & F5 to build + run in VBox.

  14. Congratulations! You can now play with Asuro!

Notes & Gotchas

  • The above process has been updated to be compatible with VirtualBox 7+, in which VBoxSDL was removed and vboxmanage should be used in its place. A small wrapper powershell script is used to achieve this.
  • It was noted that Windows builds above 20H2 seem to have issues installing WSL2. We may have to wait for a patch from Microsoft to fix this. Our devs are currently using build 20H2.
S
Description
An x86 Operating System that started development in 2015 as somewhat of an academic project. Written almost entirely in Freepascal, with NASM used only for bootstrapping & minimal low-level routines, Asuro is a purely hobbyist operating system that differs quite majorly in design from any mainstream OS.
https://asuro.xyz
Readme
61 MiB
Languages
Pascal 98.3%
Python 0.8%
Shell 0.7%
Assembly 0.1%