1 files changed, 42 insertions, 0 deletions

diff --git a/include/asm-powerpc/ppc_asm.h b/include/asm-powerpc/ppc_asm.h
index ab8688d39024..dd1c0a913d5f 100644
--- a/include/asm-powerpc/ppc_asm.h
+++ b/include/asm-powerpc/ppc_asm.h
@@ -15,6 +15,48 @@
 #define SZL                     (BITS_PER_LONG/8)
 
 /*
+ * Stuff for accurate CPU time accounting.
+ * These macros handle transitions between user and system state
+ * in exception entry and exit and accumulate time to the
+ * user_time and system_time fields in the paca.
+ */
+
+#ifndef CONFIG_VIRT_CPU_ACCOUNTING
+#define ACCOUNT_CPU_USER_ENTRY(ra, rb)
+#define ACCOUNT_CPU_USER_EXIT(ra, rb)
+#else
+#define ACCOUNT_CPU_USER_ENTRY(ra, rb)                                  \
+        beq     2f;                     /* if from kernel mode */       \
+BEGIN_FTR_SECTION;                                                      \
+        mfspr   ra,SPRN_PURR;           /* get processor util. reg */   \
+END_FTR_SECTION_IFSET(CPU_FTR_PURR);                                    \
+BEGIN_FTR_SECTION;                                                      \
+        mftb    ra;                     /* or get TB if no PURR */      \
+END_FTR_SECTION_IFCLR(CPU_FTR_PURR);                                    \
+        ld      rb,PACA_STARTPURR(r13);                         \
+        std     ra,PACA_STARTPURR(r13);                                 \
+        subf    rb,rb,ra;               /* subtract start value */      \
+        ld      ra,PACA_USER_TIME(r13);                                 \
+        add     ra,ra,rb;               /* add on to user time */       \
+        std     ra,PACA_USER_TIME(r13);                                 \
+2:
+
+#define ACCOUNT_CPU_USER_EXIT(ra, rb)                                   \
+BEGIN_FTR_SECTION;                                                      \
+        mfspr   ra,SPRN_PURR;           /* get processor util. reg */   \
+END_FTR_SECTION_IFSET(CPU_FTR_PURR);                                    \
+BEGIN_FTR_SECTION;                                                      \
+        mftb    ra;                     /* or get TB if no PURR */      \
+END_FTR_SECTION_IFCLR(CPU_FTR_PURR);                                    \
+        ld      rb,PACA_STARTPURR(r13);                         \
+        std     ra,PACA_STARTPURR(r13);                                 \
+        subf    rb,rb,ra;               /* subtract start value */      \
+        ld      ra,PACA_SYSTEM_TIME(r13);                               \
+        add     ra,ra,rb;               /* add on to user time */       \
+        std     ra,PACA_SYSTEM_TIME(r13);
+#endif
+
+/*
  * Macros for storing registers into and loading registers from
  * exception frames.
  */