[PATCH v3 09/10] x86/mm/init.c: Copy ucode from initrd image to memory

From: Fenghua Yu
Date: Sun Dec 16 2012 - 12:46:10 EST

From: Fenghua Yu <fenghua.yu@xxxxxxxxx>

Before initrd image is freed, copy valid ucode patches from initrd image
to kernel virtual memory. The saved ucode will be used to update AP in resume
or hotplug.

Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
arch/x86/mm/init.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index d7aea41..e5e7973 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -16,6 +16,7 @@
#include <asm/tlb.h>
#include <asm/proto.h>
#include <asm/dma.h> /* for MAX_DMA_PFN */
+#include <asm/microcode.h>

unsigned long __initdata pgt_buf_start;
unsigned long __meminitdata pgt_buf_end;
@@ -391,6 +392,15 @@ void free_initmem(void)
void __init free_initrd_mem(unsigned long start, unsigned long end)
+ /*
+ * Remember, initrd memory may contain microcode or other useful things.
+ * Before we lose initrd mem, we need to find a place to hold them
+ * now that normal virtual memory is enabled.
+ */
+ save_microcode_in_initrd();
* end could be not aligned, and We can not align that,
* decompresser could be confused by aligned initrd_end

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