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Subject[PATCH 0/4] x86, head_32: Some cleanups
From: Borislav Petkov <>


here are some initial low-hanging fruits wrt head_32.S cleanup. I've
made them as easily digestible as possible; after all, this is boot asm
and meddling with it tends to upset kernels.

Also, I've made the assumption that having boot_cpu_data.cpuid_level
contain the CPUID level for the boot cpu means that the APs have the
same CPUID level. This should be the case on X86.

They boot fine 486 and 486SX in qemu but I'd like to hear whether
the direction I'm going is ok before I continue testing them on real


Borislav Petkov (4):
x86, head_32: Remove i386 pieces
x86: Detect CPUID support early at boot
x86, head_32: Remove CPUID detection from default_entry
x86, 32-bit: Drop new_cpu_data

arch/x86/include/asm/processor.h | 1 -
arch/x86/kernel/head_32.S | 105 ++++++++++++++++-----------------------
arch/x86/kernel/setup.c | 3 --
arch/x86/lguest/boot.c | 6 +--
arch/x86/xen/enlighten.c | 8 +--
5 files changed, 51 insertions(+), 72 deletions(-)


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