linux-kernel - ia32 emulation on Pentium I

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Message-ID: <52AB522F.8000703@kernelgen.org>
Date:	Fri, 13 Dec 2013 19:30:07 +0100
From:	Dmitry Mikushin <dmitry@...nelgen.org>
To:	linux-kernel@...r.kernel.org
Subject: ia32 emulation on Pentium I

Dear all,

I'm trying to enable ia32 emulation in k1om kernel. Linux kernel is
ported for k1om, but with ia32 emulation disabled. With it enabled,
I'm getting the following error:

LD arch/x86/crypto/built-in.o
AS arch/x86/ia32/ia32entry.o
arch/x86/ia32/ia32entry.S: Assembler messages:
arch/x86/ia32/ia32entry.S:192: Error: `sysexit' is not supported on `k1om'
make[2]: *** [arch/x86/ia32/ia32entry.o] Error 1
make[1]: *** [arch/x86/ia32] Error 2
make: *** [arch/x86] Error 2

sysexit is not supported because k1om (Intel MIC) is essentially Pentium
I with AVX512 extensions.

sysexit is used in macro ENABLE_INTERRUPTS_SYSEXIT32, which is in turn
used in ENTRY(ia32_sysenter_target).

So, it seems ia32 emulation assumes Pentium II+. Do you see a quick
way to make it Pentium I -compatible?

Thanks,
- D.
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