powerpc: Add MSR_64BIT

The MSR bit which indicates 64-bit-ness is different between server and
booke, so add a #define which gives you the right mask regardless.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/reg.h

@@ -99,17 +99,23 @@
 #define MSR_LE		__MASK(MSR_LE_LG)	/* Little Endian */
 
 #if defined(CONFIG_PPC_BOOK3S_64)
+#define MSR_64BIT	MSR_SF
+
 /* Server variant */
 #define MSR_		MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_ISF |MSR_HV
-#define MSR_KERNEL      MSR_ | MSR_SF
+#define MSR_KERNEL	MSR_ | MSR_64BIT
 #define MSR_USER32	MSR_ | MSR_PR | MSR_EE
-#define MSR_USER64	MSR_USER32 | MSR_SF
+#define MSR_USER64	MSR_USER32 | MSR_64BIT
 #elif defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_8xx)
 /* Default MSR for kernel mode. */
 #define MSR_KERNEL	(MSR_ME|MSR_RI|MSR_IR|MSR_DR)
 #define MSR_USER	(MSR_KERNEL|MSR_PR|MSR_EE)
 #endif
 
+#ifndef MSR_64BIT
+#define MSR_64BIT	0
+#endif
+
 /* Floating Point Status and Control Register (FPSCR) Fields */
 #define FPSCR_FX	0x80000000	/* FPU exception summary */
 #define FPSCR_FEX	0x40000000	/* FPU enabled exception summary */

arch/powerpc/include/asm/reg_booke.h

@@ -27,10 +27,12 @@
 #define MSR_CM		(1<<31) /* Computation Mode (0=32-bit, 1=64-bit) */
 
 #if defined(CONFIG_PPC_BOOK3E_64)
+#define MSR_64BIT	MSR_CM
+
 #define MSR_		MSR_ME | MSR_CE
-#define MSR_KERNEL      MSR_ | MSR_CM
+#define MSR_KERNEL	MSR_ | MSR_64BIT
 #define MSR_USER32	MSR_ | MSR_PR | MSR_EE | MSR_DE
-#define MSR_USER64	MSR_USER32 | MSR_CM | MSR_DE
+#define MSR_USER64	MSR_USER32 | MSR_64BIT
 #elif defined (CONFIG_40x)
 #define MSR_KERNEL	(MSR_ME|MSR_RI|MSR_IR|MSR_DR|MSR_CE)
 #define MSR_USER	(MSR_KERNEL|MSR_PR|MSR_EE)