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Subject[PATCH 0/5] x86, head_32: Some cleanups, -v2
From: Borislav Petkov <>


here's the next version with new_cpu_data left put and two minor fixlets
added at the end. The patchset was boot-tested on a bunch of baremetal
boxes and all QEMU cpu models - no issues.

Boot tests:

* baremetal:
- P4
- Atom n270
- 32-bit kernel on an AMD64 (F10h Phenom and Intel SNB)

* qemu, with cpu models:
- qemu64
- phenom
- core2duo
- kvm64
- qemu32
- kvm32
- coreduo
- 486{,SX}
- pentium{,2,3}
- athlon
- n270,+movbe
- Conroe
- Penryn
- Nehalem
- Westmere
- SandyBridge
- Haswell
- Opteron_G{1,2,3,4,5}

Why am I testing all those, you ask? Because I'm a sadistic mofo :-)



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 (5):
x86, head_32: Remove i386 pieces
x86: Detect CPUID support early at boot
x86, head_32: Remove second CPUID detection from default_entry
x86, head_32: Give the 6 label a real name
x86, head_32: Remove an old gcc2 fix

arch/x86/kernel/head_32.S | 92 ++++++++++++++++++-----------------------------
1 file changed, 35 insertions(+), 57 deletions(-)


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