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

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Message-Id: <1355654609-16800-10-git-send-email-fenghua.yu@intel.com>
Date:	Sun, 16 Dec 2012 02:43:28 -0800
From:	"Fenghua Yu" <fenghua.yu@...el.com>
To:	"H Peter Anvin" <hpa@...or.com>, "Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Asit K Mallick" <asit.k.mallick@...el.com>,
	"Tigran Aivazian" <tigran@...azian.fsnet.co.uk>,
	"Andreas Herrmann" <andreas.herrmann3@....com>,
	"Borislav Petkov" <borislav.petkov@....com>,
	"Yinghai Lu" <yinghai@...nel.org>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"x86" <x86@...nel.org>
Cc:	"Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH v3 09/10] x86/mm/init.c: Copy ucode from initrd image to memory

From: Fenghua Yu <fenghua.yu@...el.com>

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@...el.com>
---
 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)
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
+#ifdef CONFIG_MICROCODE_EARLY
+	/*
+	 * 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();
+#endif
+
 	/*
 	 * end could be not aligned, and We can not align that,
 	 * decompresser could be confused by aligned initrd_end
-- 
1.8.0.1

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