On 16.08.2010 22:22, matthew green wrote: >> Module Name: src >> Committed By: jym >> Date: Mon Aug 16 19:39:06 UTC 2010 >> >> Modified Files: >> src/sys/arch/i386/i386: machdep.c >> src/sys/arch/x86/include: cpu.h >> >> Log Message: >> Add machdep.pae sysctl(7) for i386. Thanks to Paul and Joerg for their >> reviews. >> >> In kernel, it matches the 'i386_use_pae' variable (0: kernel does not use >> PAE, 1: kernel uses PAE). Will be used by i386 kvm(3) to know the functions >> that should get called for VA => PA translations. > > does this work for core files as well? > > if not, wouldn't this feature be better done use ugly kvm/nlist so > that it works with the same code on dead kernels? getting a 0/1 > value via kvm shouldn't really be considered any real problem.
That's the purpose; I don't know of any other way. The sysctl is only there for practical purposes: cpuctl(8) can indicate that the CPU supports PAE, but there is no easy way to know if it is active or not (unless playing with config -x together with the booted kernel, not very practical...). Hence, the sysctl machdep. > (why the extern in cpu.h? i doesn't seem necessary.) Yes; I wanted to place it at the same level as i386_use_fxsave. i386_use_pae may get use elsewhere eventually, so I added it to cpu.h. -- Jean-Yves Migeon jeanyves.mig...@free.fr