d66ceb73f8
This has been missing since the rewrite in 26b95c15f255904694ce8224b6f21f0b931a9cff. Until now it seems to not have been a problem since buffer sizes were generally small enough and did not cross page boundaries due to alignment guarantees. However, now that we have enabled jumbo frames by default, some drivers do hit DMA limits without bouncing, as these frames cross pages. So, now we implement a basic bouncing system. Unlike FreeBSD which maintains a global "bounce pages" cache that it pulls from, we use per-dmamap bounce buffers, lazily allocated only if needed. I tested this by forcing all non-"prohibited" dmamaps to bounce all transactions, and the rtl81xx driver still worked that way (though not all drivers may as they have expectations about contiguously allocated memory never getting bounced.) This should fix #17763. Hopefully it will also fix #17766 as well.
Haiku
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Haiku is an open-source operating system that specifically targets personal computing. Inspired by the BeOS, Haiku is fast, simple to use, easy to learn and yet very powerful.
Goals
- Sensible defaults with minimal configuration required.
- Clean, clear, concise code.
- Unified desktop environment.
Trying Haiku
Haiku provides pre-built nightly images and release images. Haiku is compatible with a large variety of hardware, but in case you don't want to "take the plunge" and install Haiku on bare metal, you can install it on a virtual machine (VM) instead. If you've never used a VM before, you can follow one of the "Emulating Haiku" guides.
Compiling Haiku
See ReadMe.Compiling.
Contributing
Haiku is a meritocratic open source project with a large variety of tasks. Even if you can't write code, you can still help! Haiku needs designers, (technical) writers, translators, testers... Get involved and help out!
Contributing code
If you're submitting a patch to us, please make sure you're following the patch submitting guidelines.
If you're having trouble finding something in the source tree, you can use one of our web-based source code browsers:
- https://xref.landonf.org/ (OpenGrok, provided by Landon Fuller)
- https://git.haiku-os.org/ (git, provided by Haiku, Inc.)
Contributing documentation
The main piece of documentation that still needs work are the API docs (found
in the tree at docs/user). Just find an undocumented class, write
documentation for it, and submit a patch.
Contributing translations
See wiki:i18n.
Contributing software ports
See HaikuPorts.
Contributing to our infrastructure
See Infrastructure.