x86/mm: Use/Fix PCID to optimize user/kernel switches

[uclinux-h8/linux.git] / arch / x86 / include / uapi / asm / processor-flags.h

diff --git a/arch/x86/include/uapi/asm/processor-flags.h b/arch/x86/include/uapi/asm/processor-flags.h
index 53b4ca5..97abdaa 100644 (file)
--- a/arch/x86/include/uapi/asm/processor-flags.h
+++ b/arch/x86/include/uapi/asm/processor-flags.h
@@ -78,7 +78,12 @@
 #define X86_CR3_PWT            _BITUL(X86_CR3_PWT_BIT)
 #define X86_CR3_PCD_BIT                4 /* Page Cache Disable */
 #define X86_CR3_PCD            _BITUL(X86_CR3_PCD_BIT)
-#define X86_CR3_PCID_MASK      _AC(0x00000fff,UL) /* PCID Mask */
+
+#define X86_CR3_PCID_BITS      12
+#define X86_CR3_PCID_MASK      (_AC((1UL << X86_CR3_PCID_BITS) - 1, UL))
+
+#define X86_CR3_PCID_NOFLUSH_BIT 63 /* Preserve old PCID */
+#define X86_CR3_PCID_NOFLUSH    _BITULL(X86_CR3_PCID_NOFLUSH_BIT)
 
 /*
  * Intel CPU features in CR4