Date: Wed, 15 May 1996 23:58:45 +1000 From: Bruce Evans <bde@zeta.org.au> To: asami@cs.berkeley.edu, bde@zeta.org.au Cc: ccd@stampede.cs.berkeley.edu, current@freebsd.org Subject: Re: some more on fast bcopy Message-ID: <199605151358.XAA22996@godzilla.zeta.org.au>
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>Okay, I implemented this (I think) with the help of gcc -S, but I >still get "FPU not available" panics intermittently (often during >"make install"s). Here's the diff, can you please check and see if >something's wrong? It should work better with a kernel mode trap handler for "FPU not available" :-). Add a T_DNA case for kernel mode in trap() by copying the first 5 lines from the user mode T_DNA case (`break;' if npxdna() doesn't handle the panic (this "can't happen")). When you get everything working, add some tests and flags to restore the panic if an T_DNA trap occurs unexpectedly (set a flag FP_KERNEL_USING_FP in pcb->pcbflags while the kernel is using FP in fastmove() or elsewhere, and `break;' for the kernel T_DNA case if this flag isn't set). Also, the `intr_nesting_level > 0' case needs to preserve the TS bit. This case probably hasn't been executed yet (it will be executed when bcopy() uses fastmove() and an interrupt handler calls bcopy()). Brucehome | help
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