[PATCH] x86-64: Move cpu verification code to common file

o This patch moves the code to verify long mode and SSE to a common file.
  This code is now shared by trampoline.S, wakeup.S, boot/setup.S and
  boot/compressed/head.S

o So far we used to do very limited check in trampoline.S, wakeup.S and
  in 32bit entry point. Now all the entry paths are forced to do the
  exhaustive check, including SSE because verify_cpu is shared.

o I am keeping this patch as last in the x86 relocatable series because
  previous patches have got quite some amount of testing done and don't want
  to distrub that. So that if there is problem introduced by this patch, at
  least it can be easily isolated.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 15 insertions, 15 deletions

diff --git a/arch/x86_64/kernel/acpi/wakeup.S b/arch/x86_64/kernel/acpi/wakeup.S
index 766cfbcac1db..8550a6ffa275 100644
--- a/arch/x86_64/kernel/acpi/wakeup.S
+++ b/arch/x86_64/kernel/acpi/wakeup.S
@@ -43,6 +43,11 @@ wakeup_code:
         cmpl    $0x12345678, %eax
         jne     bogus_real_magic
 
+        call    verify_cpu                      # Verify the cpu supports long
+                                                # mode
+        testl   %eax, %eax
+        jnz     no_longmode
+
         testl   $1, video_flags - wakeup_code
         jz      1f
         lcall   $0xc000,$3
@@ -92,18 +97,6 @@ wakeup_32:
 # Running in this code, but at low address; paging is not yet turned on.
         movb    $0xa5, %al      ;  outb %al, $0x80
 
-        /* Check if extended functions are implemented */               
-        movl    $0x80000000, %eax
-        cpuid
-        cmpl    $0x80000000, %eax
-        jbe     bogus_cpu
-        wbinvd
-        mov     $0x80000001, %eax
-        cpuid
-        btl     $29, %edx
-        jnc     bogus_cpu
-        movl    %edx,%edi
-        
         movl    $__KERNEL_DS, %eax
         movl    %eax, %ds
 
@@ -123,6 +116,11 @@ wakeup_32:
         leal    (wakeup_level4_pgt - wakeup_code)(%esi), %eax
         movl    %eax, %cr3
 
+        /* Check if nx is implemented */
+        movl    $0x80000001, %eax
+        cpuid
+        movl    %edx,%edi
+
         /* Enable Long Mode */
         xorl    %eax, %eax
         btsl    $_EFER_LME, %eax
@@ -244,10 +242,12 @@ bogus_64_magic:
         movb    $0xb3,%al       ;  outb %al,$0x80
         jmp bogus_64_magic
 
-bogus_cpu:
-        movb    $0xbc,%al       ;  outb %al,$0x80
-        jmp bogus_cpu
+.code16
+no_longmode:
+        movb    $0xbc,%al       ;  outb %al,$0x80
+        jmp no_longmode
 
+#include "../verify_cpu.S"
         
 /* This code uses an extended set of video mode numbers. These include:
  * Aliases for standard modes