Date: Fri, 9 Mar 2001 21:36:18 -0500 From: "Matthew Emmerton" <matt@gsicomp.on.ca> To: <freebsd-hackers@FreeBSD.ORG> Subject: Re: Kernel area libmish stuff Message-ID: <000b01c0a90a$e3287360$1200a8c0@gsicomp.on.ca> References: <Pine.BSF.4.10.10103091805250.62467-100000@mail.matriplex.com>
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> On Fri, 9 Mar 2001, Matt Dillon wrote: > > > You can't safely do FP instructions in the kernel. I do not > > believe the FP context is saved/restored between processes in kernel > > mode, only from user mode. The kernel saves and restores the fp state > > in the few places it uses FP instructions (for memory copying). > > In anycase, I think there'd be a problem here. > > The last time I tried using FP in a device driver, it caused kernel > panics (I hate it when that happens...) Seeing as the original requestor wanted to use FP functions to do number crunching in screen savers, would adding a few strategic FP save/restore calls in the syscons driver be enough to allow FP calculations in screen saver modules? -- Matt Emmerton To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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