Patch by Jan Klötzke:

* In vm86 mode CS will have arbitrary values so we check for both USER_CODE_SEG
  and the VM flag in EFLAGS. This is also done when entering interrupt gates.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25607 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/arch/x86/arch_cpu.h

@@ -157,6 +157,10 @@ struct iframe {
 	uint32 user_ss;
 };
 
+#define IFRAME_IS_USER(f) ( ((f)->cs == USER_CODE_SEG) \
+                            || (((f)->flags & 0x20000) != 0 ))
+#define IFRAME_IS_VM86(f) ( ((f)->flags & 0x20000) != 0 )
+
 // features
 enum x86_feature_type {
 	FEATURE_COMMON = 0,     // cpuid eax=1, ecx register