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x86, microcode, amd: Early microcode patch loading support for AMD

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Add early microcode patch loading support for AMD.

Signed-off-by: Jacob Shin <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
Cc: Fenghua Yu <[email protected]>
This commit is contained in:
Jacob Shin 2013-05-30 14:09:19 -05:00 • committed by H. Peter Anvin
commit 757885e94a
7 changed files with 310 additions and 17 deletions
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11
Documentation/x86/early-microcode.txt
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@ -11,7 +11,8 @@ file and loaded to CPUs during boot time.
The format of the combined initrd image is microcode in cpio format followed by
the initrd image (maybe compressed). Kernel parses the combined initrd image
during boot time. The microcode file in cpio name space is:
kernel/x86/microcode/GenuineIntel.bin
on Intel: kernel/x86/microcode/GenuineIntel.bin
on AMD : kernel/x86/microcode/AuthenticAMD.bin
During BSP boot (before SMP starts), if the kernel finds the microcode file in
the initrd file, it parses the microcode and saves matching microcode in memory.
@ -34,10 +35,8 @@ original initrd image /boot/initrd-3.5.0.img.
mkdir initrd
cd initrd
mkdir kernel
mkdir kernel/x86
mkdir kernel/x86/microcode
cp ../microcode.bin kernel/x86/microcode/GenuineIntel.bin
find .|cpio -oc >../ucode.cpio
mkdir -p kernel/x86/microcode
cp ../microcode.bin kernel/x86/microcode/GenuineIntel.bin (or AuthenticAMD.bin)
find . | cpio -o -H newc >../ucode.cpio
cd ..
cat ucode.cpio /boot/initrd-3.5.0.img >/boot/initrd-3.5.0.ucode.img