On Tue, Apr 05, 2016 at 06:32:16PM -0700, John Baldwin wrote: > On Tuesday, April 05, 2016 10:36:49 PM Baptiste Daroussin wrote: > > Author: bapt > > Date: Tue Apr 5 22:36:48 2016 > > New Revision: 297597 > > URL: https://svnweb.freebsd.org/changeset/base/297597 > > > > Log: > > Add kern.features flags for linux and linux64 modules > > > > kern.features.linux: 1 meaning linux 32 bits binaries are supported > > kern.features.linux64: 1 meaning linux 64 bits binaries are supported > > > > The goal here is to help 3rd party applications (including ports) to > > determine > > if the host do support linux emulation > > > > Reviewed by: dchagin > > MFC after: 1 week > > Relnotes: yes > > Differential Revision: D5830 > > Other parts of the system (e.g. libsysdecode, the various symbols exported by > the modules, etc.) use "linux" to mean supporting Linux binaries of the same > ABI as the host (so x86-64 on amd64 and i386 on i386) and "linux32" to mean > supporting 32-bit Linux binaries on a 64-bit host. Note that we used to > have linux.ko on Alpha which was a 64-bit ABI, not 32-bit. It is unfortunate > that we called linux32.ko linux.ko, but we shouldn't perpetuate that mistake > further IMO. For example, I think if we grow Linux/aarch64 ABI support on > FreeBSD/arm64, that should be called 'linux.ko', not 'linux64.ko'. > Similarly, Linux/armv6 on FreeBSD/armv6 would also be 'linux.ko'. > > I would also list the names in the feature description (so Linux/i386, not > Linux 32-bit, since Linux/armv6 is a 32-bit binary, but linux.ko on > FreeBSD/i386 can't run it). > Well I tried to be consistent with the other example we have which is cloudabi.
I considered the x86 case and tried to generalize: linux => my arch (x86) in 32bit linux64 => my arch (x86) in 64bit Let's consider aarch64 which is supposed to also have support for 32bits (one would be happy to run linux armv6 on top of it ,no?) linux => my arm in 32bits linux64 => my arch in 64bits That said, I have no strong feelings about it Bapt
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