linux-kernel - [tip:x86/asm] x86, head

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Message-ID: <tip-166df91daf38f619d4ca90b58ff90983de6e40d2@git.kernel.org>
Date:	Tue, 12 Feb 2013 16:07:55 -0800
From:	tip-bot for Borislav Petkov <bp@...e.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	tglx@...utronix.de, hpa@...ux.intel.com, bp@...e.de
Subject: [tip:x86/asm] x86, head_32: Remove i386 pieces

Commit-ID:  166df91daf38f619d4ca90b58ff90983de6e40d2
Gitweb:     http://git.kernel.org/tip/166df91daf38f619d4ca90b58ff90983de6e40d2
Author:     Borislav Petkov <bp@...e.de>
AuthorDate: Mon, 11 Feb 2013 15:22:15 +0100
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Tue, 12 Feb 2013 15:48:40 -0800

x86, head_32: Remove i386 pieces

Remove code fragments detecting a 386 CPU since we don't support those
anymore. Also, do not do alignment checks because they're done only at
CPL3. Also, no need to preserve EFLAGS.

Signed-off-by: Borislav Petkov <bp@...e.de>
Link: http://lkml.kernel.org/r/1360592538-10643-2-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/kernel/head_32.S | 22 +++++-----------------
 1 file changed, 5 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index c8932c7..a9c5cc8 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -394,30 +394,21 @@ default_entry:
 	jz 1f				# Did we do this already?
 	call *%eax
 1:
-	
-/* check if it is 486 or 386. */
+
 /*
- * XXX - this does a lot of unnecessary setup.  Alignment checks don't
- * apply at our cpl of 0 and the stack ought to be aligned already, and
- * we don't need to preserve eflags.
+ * Check if it is 486
  */
 	movl $-1,X86_CPUID	# -1 for no CPUID initially
-	movb $3,X86		# at least 386
+	movb $4,X86		# at least 486
 	pushfl			# push EFLAGS
 	popl %eax		# get EFLAGS
 	movl %eax,%ecx		# save original EFLAGS
-	xorl $0x240000,%eax	# flip AC and ID bits in EFLAGS
+	xorl $0x200000,%eax	# flip ID bit in EFLAGS
 	pushl %eax		# copy to EFLAGS
 	popfl			# set EFLAGS
 	pushfl			# get new EFLAGS
 	popl %eax		# put it in eax
 	xorl %ecx,%eax		# change in flags
-	pushl %ecx		# restore original EFLAGS
-	popfl
-	testl $0x40000,%eax	# check if AC bit changed
-	je is386
-
-	movb $4,X86		# at least 486
 	testl $0x200000,%eax	# check if ID bit changed
 	je is486
 
@@ -445,10 +436,7 @@ default_entry:
 	movl %edx,X86_CAPABILITY
 
 is486:	movl $0x50022,%ecx	# set AM, WP, NE and MP
-	jmp 2f
-
-is386:	movl $2,%ecx		# set MP
-2:	movl %cr0,%eax
+	movl %cr0,%eax
 	andl $0x80000011,%eax	# Save PG,PE,ET
 	orl %ecx,%eax
 	movl %eax,%cr0
--
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