[patch 3/8] x86: UV - Introduce uv_gpa_is_mmr.

[Robin Holt <holt@sgi.com>]

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Provide a mechanism for determining if a global physical address is
pointing to a UV hub MMR.

To: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Robin Holt <holt@sgi.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: lkml <linux-kernel@vger.kernel.org>
Cc: linux-mm@vger.kernel.org

---

 arch/x86/include/asm/uv/uv_hub.h |    7 +++++++
 1 file changed, 7 insertions(+)


Index: linux-x86/arch/x86/include/asm/uv/uv_hub.h
===================================================================
--- linux-x86.orig/arch/x86/include/asm/uv/uv_hub.h	2009-11-09 08:50:25.000000000 -0600
+++ linux-x86/arch/x86/include/asm/uv/uv_hub.h	2009-11-09 08:52:14.000000000 -0600
@@ -232,6 +232,13 @@ static inline unsigned long uv_gpa(void 
 	return uv_soc_phys_ram_to_gpa(__pa(v));
 }
 
+/* Top two bits indicate the requested address is in MMR space.  */
+static inline int
+uv_gpa_in_mmr_space(unsigned long gpa)
+{
+	return (gpa >> 62) == 0x3UL;
+}
+
 /* UV global physical address --> socket phys RAM */
 static inline unsigned long uv_gpa_to_soc_phys_ram(unsigned long gpa)
 {