+/*
+ * 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
+