linux-kernel - [tip:x86/microcode] x86/mm/init.c: Copy ucode from initrd image to memory

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Message-ID: <tip-834137534b34b2ef0e1c3c00ad6a31e06b604e00@git.kernel.org>
Date:	Fri, 30 Nov 2012 16:29:27 -0800
From:	tip-bot for Fenghua Yu <fenghua.yu@...el.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	fenghua.yu@...el.com, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/microcode] x86/mm/init.c:
  Copy ucode from initrd image to memory

Commit-ID:  834137534b34b2ef0e1c3c00ad6a31e06b604e00
Gitweb:     http://git.kernel.org/tip/834137534b34b2ef0e1c3c00ad6a31e06b604e00
Author:     Fenghua Yu <fenghua.yu@...el.com>
AuthorDate: Thu, 29 Nov 2012 17:47:47 -0800
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Fri, 30 Nov 2012 15:18:17 -0800

x86/mm/init.c: Copy ucode from initrd image to memory

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.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Link: http://lkml.kernel.org/r/1354240068-9821-10-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.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..a294d4b 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(&mc_saved_data, mc_saved_in_initrd);
+#endif
+
 	/*
 	 * end could be not aligned, and We can not align that,
 	 * decompresser could be confused by aligned initrd_end
--
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