Date: Tue, 28 May 1996 08:04:27 -0700 From: "Michael L. VanLoon -- HeadCandy.com" <michaelv@HeadCandy.com> To: Alexander Seth Jones <ajones@ctron.com> Cc: hackers@freefall.freebsd.org Subject: Re: using floating point arithmetic inside a device driver Message-ID: <199605281504.IAA07790@MindBender.HeadCandy.com> In-Reply-To: Your message of Tue, 28 May 96 09:37:03 -0400. <31AB017F.1EE1@ctron.com>
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> I'm writing a device driver which needs to do some floating point
>calculations, but when the floating point code executes the kernel traps
>with number 22 "FPU device not available". I'm have an AMD 486DX4-120.
>I'm not concerned with portability at this time (ie running on SX's).
> Would someone care to explain what's going on?
Do you have the npx (numeric processor exception?) device configured
into your kernel? You'll need it for floating point. This is NetBSD
config syntax, but FreeBSD should be pretty similar:
# Math coprocessor/emulation support:
npx0 at isa? port 0xf0 irq 13 # math coprocessor
(If you already have this, then I don't have an answer...)
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Michael L. VanLoon michaelv@HeadCandy.com
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