From: bifferos <bifferos@yahoo.co.uk>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] Emulation of early 486 CPUs (no fpu, no cpuid)
Date: Tue, 1 Sep 2009 05:05:54 -0700 (PDT) [thread overview]
Message-ID: <476105.70627.qm@web27005.mail.ukl.yahoo.com> (raw)
Hi,
I'm trying to emulate a 486SX CPU, so was wondering how to knock out cpuid and fpu. I've changed the definition of ID_MASK in target-i386/cpu.h to zero, and this prevents Linux from detecting cpuid capability. Bit of a hack, because the instruction is still there, but never mind. I've been trying to work out how to disable fpu emulation so Linux falls back on software emulation.
Can someone throw me a bone?
many thanks.
Biff.
next reply other threads:[~2009-09-01 12:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-01 12:05 bifferos [this message]
2009-09-01 16:39 ` [Qemu-devel] Emulation of early 486 CPUs (no fpu, no cpuid) Blue Swirl
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