x86: provide paravirtualized hook for rdtscp
This patch adds a field in pv_cpu_ops for a paravirtualized hook
for rdtscp, needed for x86_64.
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
index 66290f5..8f79843 100644
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -120,6 +120,7 @@
u64 (*read_tsc)(void);
u64 (*read_pmc)(int counter);
+ unsigned long long (*read_tscp)(unsigned int *aux);
/* These two are jmp to, not actually called. */
void (*irq_enable_syscall_ret)(void);
@@ -668,6 +669,27 @@
high = _l >> 32; \
} while(0)
+static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
+{
+ return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
+}
+
+#define rdtscp(low, high, aux) \
+do { \
+ int __aux; \
+ unsigned long __val = paravirt_rdtscp(&__aux); \
+ (low) = (u32)__val; \
+ (high) = (u32)(__val >> 32); \
+ (aux) = __aux; \
+} while (0)
+
+#define rdtscpll(val, aux) \
+do { \
+ unsigned long __aux; \
+ val = paravirt_rdtscp(&__aux); \
+ (aux) = __aux; \
+} while (0)
+
static inline void load_TR_desc(void)
{
PVOP_VCALL0(pv_cpu_ops.load_tr_desc);