linux-kernel - [tip:x86/mm2] x86, boot: Move verify_cpu.S and no

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Message-ID: <tip-187a8a73cee295b9407de0d6bfba65471a1f39d6@git.kernel.org>
Date:	Tue, 29 Jan 2013 17:38:40 -0800
From:	tip-bot for Yinghai Lu <yinghai@...nel.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	yinghai@...nel.org, tglx@...utronix.de, hpa@...ux.intel.com,
	matt.fleming@...el.com
Subject: [tip:x86/mm2] x86, boot: Move verify_cpu.S and no_longmode down

Commit-ID:  187a8a73cee295b9407de0d6bfba65471a1f39d6
Gitweb:     http://git.kernel.org/tip/187a8a73cee295b9407de0d6bfba65471a1f39d6
Author:     Yinghai Lu <yinghai@...nel.org>
AuthorDate: Thu, 24 Jan 2013 12:20:00 -0800
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Tue, 29 Jan 2013 15:26:15 -0800

x86, boot: Move verify_cpu.S and no_longmode down

We need to move some code to 32bit section in following patch:

   x86, boot: Move lldt/ltr out of 64bit code section

but that will push startup_64 down from 0x200.

According to hpa, we can not change startup_64 position and that
is an ABI.

We could move function verify_cpu and no_longmode down, because
verify_cpu is used via function call and no_longmode will not
return, then we don't need to add extra code for jumping back.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-20-git-send-email-yinghai@kernel.org
Cc: Matt Fleming <matt.fleming@...el.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/boot/compressed/head_64.S | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 2c4b171..fb984c0 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -176,14 +176,6 @@ ENTRY(startup_32)
 	lret
 ENDPROC(startup_32)
 
-no_longmode:
-	/* This isn't an x86-64 CPU so hang */
-1:
-	hlt
-	jmp     1b
-
-#include "../../kernel/verify_cpu.S"
-
 	/*
 	 * Be careful here startup_64 needs to be at a predictable
 	 * address so I can export it in an ELF header.  Bootloaders
@@ -349,6 +341,15 @@ relocated:
  */
 	jmp	*%rbp
 
+	.code32
+no_longmode:
+	/* This isn't an x86-64 CPU so hang */
+1:
+	hlt
+	jmp     1b
+
+#include "../../kernel/verify_cpu.S"
+
 	.data
 gdt:
 	.word	gdt_end - gdt
--
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