[Xen-devel] [PATCH 6/6] xentrace: ARM platform timestamp support

[Benjamin Sanda <ben.sanda@xxxxxxxxxxxxxxx>]

From: bensanda <ben.sanda@xxxxxxxxxxxxxxx>

Modified to provide support for xentrace on the ARM platform. Changed 
get_cycles() to return the core timestamp tick count for use by the trace 
buffer timestamping routines in xentrace.

Signed-off-by: Benjamin Sanda <ben.sanda@xxxxxxxxxxxxxxx>
---
 xen/include/asm-arm/time.h | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/xen/include/asm-arm/time.h b/xen/include/asm-arm/time.h
index 5b9a31d..f3a22d5 100644
--- a/xen/include/asm-arm/time.h
+++ b/xen/include/asm-arm/time.h
@@ -1,15 +1,21 @@
 #ifndef __ARM_TIME_H__
 #define __ARM_TIME_H__
 
+#include <asm/regs.h>
+
 #define DT_MATCH_TIMER                      \
     DT_MATCH_COMPATIBLE("arm,armv7-timer"), \
     DT_MATCH_COMPATIBLE("arm,armv8-timer")
 
-typedef unsigned long cycles_t;
+/* Counter value at boot time */
+extern uint64_t boot_count;
+
+typedef uint64_t cycles_t;
 
 static inline cycles_t get_cycles (void)
 {
-        return 0;
+        /* return raw tick count of main timer */
+        return READ_SYSREG64(CNTPCT_EL0) - boot_count;
 }
 
 /* List of timer's IRQ */
@@ -34,9 +40,6 @@ unsigned int timer_get_irq(enum timer_ppi ppi);
 /* Set up the timer interrupt on this CPU */
 extern void init_timer_interrupt(void);
 
-/* Counter value at boot time */
-extern uint64_t boot_count;
-
 extern s_time_t ticks_to_ns(uint64_t ticks);
 extern uint64_t ns_to_ticks(s_time_t ns);
 
-- 
2.7.2


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