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-rw-r--r--arch/powerpc/include/asm/reg.h8
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index f0cb7f461b9d..638608677e2a 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -491,6 +491,7 @@
#define SPRN_SPRG1 0x111 /* Special Purpose Register General 1 */
#define SPRN_SPRG2 0x112 /* Special Purpose Register General 2 */
#define SPRN_SPRG3 0x113 /* Special Purpose Register General 3 */
+#define SPRN_USPRG3 0x103 /* SPRG3 userspace read */
#define SPRN_SPRG4 0x114 /* Special Purpose Register General 4 */
#define SPRN_SPRG5 0x115 /* Special Purpose Register General 5 */
#define SPRN_SPRG6 0x116 /* Special Purpose Register General 6 */
@@ -753,14 +754,14 @@
* 64-bit server:
* - SPRG0 unused (reserved for HV on Power4)
* - SPRG2 scratch for exception vectors
- * - SPRG3 unused (user visible)
+ * - SPRG3 CPU and NUMA node for VDSO getcpu (user visible)
* - HSPRG0 stores PACA in HV mode
* - HSPRG1 scratch for "HV" exceptions
*
* 64-bit embedded
* - SPRG0 generic exception scratch
* - SPRG2 TLB exception stack
- * - SPRG3 unused (user visible)
+ * - SPRG3 CPU and NUMA node for VDSO getcpu (user visible)
* - SPRG4 unused (user visible)
* - SPRG6 TLB miss scratch (user visible, sorry !)
* - SPRG7 critical exception scratch
@@ -1024,7 +1025,8 @@
/* Macros for setting and retrieving special purpose registers */
#ifndef __ASSEMBLY__
#define mfmsr() ({unsigned long rval; \
- asm volatile("mfmsr %0" : "=r" (rval)); rval;})
+ asm volatile("mfmsr %0" : "=r" (rval) : \
+ : "memory"); rval;})
#ifdef CONFIG_PPC_BOOK3S_64
#define __mtmsrd(v, l) asm volatile("mtmsrd %0," __stringify(l) \
: : "r" (v) : "memory")