Rename kernel's clock_vars.h to sys_clock.h

The revised name better reflects the fact that the file defines
macros in addition to declaring variables. In addition, most of
these APIs use the "sys_clock_" prefix, which aligns well with
the new file name.

Change-Id: Ib33517d4b19ec2455303b87200c677e87640fcbc
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>

arch/arc/timer/arcv2_timer0.c

@@ -45,7 +45,7 @@ The ARCv2 processor timer provides a 32-bit incrementing, wrap-to-zero counter.
 #include <sections.h>
 #include <misc/__assert.h>
 #include <arch/arc/v2/aux_regs.h>
-#include <clock_vars.h>
+#include <sys_clock.h>
 #include <drivers/system_timer.h>
 
 /*

arch/arm/timer/systick.c

@@ -55,7 +55,7 @@ conjunction with a microkernel.
 #include <toolchain.h>
 #include <sections.h>
 #include <misc/__assert.h>
-#include <clock_vars.h>
+#include <sys_clock.h>
 #include <drivers/system_timer.h>
 
 #ifdef CONFIG_MICROKERNEL

drivers/timer/hpet.c

@@ -67,7 +67,7 @@ In a nanokernel-only system this device driver omits more complex capabilities
 #include <nanokernel.h>
 #include <toolchain.h>
 #include <sections.h>
-#include <clock_vars.h>
+#include <sys_clock.h>
 #include <drivers/system_timer.h>
 
 #ifdef CONFIG_MICROKERNEL

drivers/timer/i8253.c

@@ -53,7 +53,7 @@ directly invoke the VIOAPIC APIs to configure/unmask the IRQ.
 #include <toolchain.h>
 #include <sections.h>
 #include <limits.h>
-#include <clock_vars.h>
+#include <sys_clock.h>
 #include <drivers/system_timer.h>
 
 #ifdef CONFIG_MICROKERNEL

drivers/timer/loapic_timer.c

@@ -46,7 +46,7 @@ After reset, the timer is initialized to zero.
 #include <nanokernel.h>
 #include <toolchain.h>
 #include <sections.h>
-#include <clock_vars.h>
+#include <sys_clock.h>
 #include <drivers/system_timer.h>
 #include <drivers/loapic.h> /* LOAPIC registers */
 

include/microkernel/ticks.h

@@ -34,7 +34,7 @@
 #define TICKS_H
 
 #include <nanokernel.h>
-#include <clock_vars.h>
+#include <sys_clock.h>
 
 /* externs */
 

include/nanokernel.h

@@ -42,7 +42,7 @@
 /* generic kernel public APIs */
 
 #include <kernel_version.h>
-#include <clock_vars.h>
+#include <sys_clock.h>
 #include <drivers/rand32.h>
 
 #ifdef __cplusplus

include/sys_clock.h

@@ -37,8 +37,8 @@ Declare variables used by both system timer device driver and kernel components
 that use timer functionality.
 */
 
-#ifndef _CLOCK_VARS__H_
+#ifndef _SYS_CLOCK__H_
-#define _CLOCK_VARS__H_
+#define _SYS_CLOCK__H_
 
 #ifndef _ASMLANGUAGE
 #include <stdint.h>
@@ -82,4 +82,4 @@ extern struct nano_timer *_nano_timer_list;
 
 #endif /* !_ASMLANGUAGE */
 
-#endif /* _CLOCK_VARS__H_ */
+#endif /* _SYS_CLOCK__H_ */

kernel/nanokernel/int_latency_bench.c

@@ -37,7 +37,7 @@
 #include <stdint.h>	    /* uint32_t */
 #include <limits.h>	    /* ULONG_MAX */
 #include <misc/printk.h> /* printk */
-#include <clock_vars.h>
+#include <sys_clock.h>
 #include <drivers/system_timer.h>
 
 #define NB_CACHE_WARMING_DRY_RUN 7

kernel/nanokernel/nano_sys_clock.c

@@ -215,7 +215,7 @@ static inline void handle_expired_nano_timeouts(int ticks)
 
 /* handle the expired nano timers in the nano timers queue */
 #ifdef CONFIG_NANO_TIMERS
-#include <clock_vars.h>
+#include <sys_clock.h>
 static inline void handle_expired_nano_timers(int ticks)
 {
 	if (_nano_timer_list) {