VServer 1.9.2 (patch-2.6.8.1-vs1.9.2.diff)

[linux-2.6.git] / arch / i386 / kernel / head.S

diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S
index 3f868ea..69bad9b 100644 (file)
--- a/arch/i386/kernel/head.S
+++ b/arch/i386/kernel/head.S
@@ -153,6 +153,32 @@ ENTRY(startup_32_smp)
        orl %edx,%eax
        movl %eax,%cr4
 
+       btl $5, %eax            # check if PAE is enabled
+       jnc 6f
+
+       /* Check if extended functions are implemented */
+       movl $0x80000000, %eax
+       cpuid
+       cmpl $0x80000000, %eax
+       jbe 6f
+       mov $0x80000001, %eax
+       cpuid
+       /* Execute Disable bit supported? */
+       btl $20, %edx
+       jnc 6f
+
+       /* Setup EFER (Extended Feature Enable Register) */
+       movl $0xc0000080, %ecx
+       rdmsr
+
+       btsl $11, %eax
+       /* Make changes effective */
+       wrmsr
+
+6:
+       /* cpuid clobbered ebx, set it up again: */
+       xorl %ebx,%ebx
+       incl %ebx
 3:
 #endif /* CONFIG_SMP */