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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. whitequark‏ @whitequark Oct 9

      today i learned that "SD Express" is a thing. that is, SD card with a PCIe interface. IOMMU should be mandatory on literally all hardware with PCIe in 2018

      9 replies 64 retweets 210 likes
      Show this thread
      Rich Felker‏ @RichFelker Oct 10
      Replying to @whitequark @qrs

      Can we just isolate the PCIe physically on a fake bus with a little bit of its own dram, connected to the real computer over a safe bus without bus mastering dma support?

      10:09 AM - 10 Oct 2018
      • 1 Like
      • Mr The Plague
      1 reply 0 retweets 1 like
        1. New conversation
        2. Robert Ou‏ @rqou_ Oct 10
          Replying to @RichFelker @whitequark @qrs

          You work on SH, your should know that this has been done before :P (Dreamcast G2 works this way. It works but doesn't get the absolute best performance)

          1 reply 0 retweets 6 likes
        3. Rich Felker‏ @RichFelker Oct 11
          Replying to @rqou_ @whitequark @qrs

          Is there a good writeup on this? Is it sufficiently compatible with OS driver architectures that the same principal (a "PCIe condom") could be used on modern PCs?

          2 replies 0 retweets 0 likes
        4. Robert Ou‏ @rqou_ Oct 11
          Replying to @RichFelker @whitequark @qrs

          The device I'm referring to was only ever officially used for an RTL8139. I think both Linux and NetBSD still use their normal drivers with an extra driver for the G2 glue. This also requires drivers to allocate bounce buffers for DMA. I think Linux/NetBSD do this automatically.

          0 replies 0 retweets 1 like
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