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by mapgrep
1761 days ago
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From the white paper published on netbsd.org: “ An implementation that does this ships with NetBSD, allowing the NetBSD drivers to be run in NetBSD userspace… The first major PCI driver developed was the In- tel Centrino 7260 driver developed for NetBSD and OpenBSD by Antti Kantee. The commit message said “This is probably the world’s first Canadian cross device driver: it was created for OpenBSD by writing and port- ing a NetBSD driver which was developed in a rump ker- nel in Linux userspace.”[13] Further, just another example, from page 149 in the dissertation is an extended many page discussion of how the rump kernel was used to provide usb support in netbsd. http://lib.tkk.fi/Diss/2012/isbn9789526049175/isbn9789526049... “ We implemented a host controller called ugenhc. When the kernel’s device autocon- figuration subsystem calls the ugenhc driver to probe the device, the ugenhc driver tries to open /dev/ugen on the host. If the open is successful, the host kernel has attached a device to the respective ugen instance and ugenhc can return a successful match. Next, the ugenhc driver is attached in the rump kernel, along with a USB bus and a USB root hub. The root hub driver explores the bus to see which devices are connected to it, causing the probes to be delivered first to ugenhc and through /dev/ugen to the host kernel and finally to the actual hardware. Figure 3.24 con- tains a “dmesg” of a server with four ugenhc devices configured and one USB mass media attached.” ¯\_(ツ)_/¯ |
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UTSL.
The author used rump to develop the drivers, it isn't used to run them in a production NetBSD kernel.