arch/sim: Add clkdev driver for sim.

This commit added clkdev driver for sim.

Signed-off-by: ouyangxiangzhen <ouyangxiangzhen@xiaomi.com>

arch/Kconfig

@@ -119,6 +119,7 @@ config ARCH_SIM
 	select ARCH_SETJMP_H
 	select ALARM_ARCH
 	select ONESHOT
+	select ONESHOT_COUNT
 	select SERIAL_CONSOLE
 	select SERIAL_IFLOWCONTROL
 	select SCHED_HPWORK

arch/sim/src/nuttx-names.in

@@ -133,7 +133,6 @@ NXSYMBOLS(sched_yield)
 NXSYMBOLS(select)
 NXSYMBOLS(sendmsg)
 NXSYMBOLS(sendto)
-NXSYMBOLS(setitimer)
 NXSYMBOLS(setbuf)
 NXSYMBOLS(setjmp)
 NXSYMBOLS(setsockopt)
@@ -158,6 +157,8 @@ NXSYMBOLS(syslog)
 NXSYMBOLS(system)
 NXSYMBOLS(tcgetattr)
 NXSYMBOLS(tcsetattr)
+NXSYMBOLS(timer_create)
+NXSYMBOLS(timer_settime)
 NXSYMBOLS(unlink)
 NXSYMBOLS(usleep)
 NXSYMBOLS(utimensat)

arch/sim/src/sim/posix/sim_hosttime.c

@@ -1,8 +1,6 @@
 /****************************************************************************
  * arch/sim/src/sim/posix/sim_hosttime.c
  *
- * SPDX-License-Identifier: Apache-2.0
- *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
@@ -34,34 +32,51 @@
 
 #include "sim_internal.h"
 
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static uint64_t g_start;
+static timer_t  g_timer;
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: host_inittimer
+ ****************************************************************************/
+
+int host_inittimer(void)
+{
+  struct timespec tp;
+  struct sigevent sigev =
+    {
+      0
+    };
+
+  clock_gettime(CLOCK_MONOTONIC, &tp);
+
+  g_start = 1000000000ull * tp.tv_sec + tp.tv_nsec;
+  sigev.sigev_notify = SIGEV_SIGNAL;
+  sigev.sigev_signo  = SIGALRM;
+
+  return timer_create(CLOCK_MONOTONIC, &sigev, &g_timer);
+}
+
 /****************************************************************************
  * Name: host_gettime
  ****************************************************************************/
 
 uint64_t host_gettime(bool rtc)
 {
-  static uint64_t start;
   struct timespec tp;
   uint64_t current;
 
   clock_gettime(rtc ? CLOCK_REALTIME : CLOCK_MONOTONIC, &tp);
   current = 1000000000ull * tp.tv_sec + tp.tv_nsec;
 
-  if (rtc)
-    {
-      return current;
-    }
-
-  if (start == 0)
-    {
-      start = current;
-    }
-
-  return current - start;
+  return rtc ? current : current - g_start;
 }
 
 /****************************************************************************
@@ -104,14 +119,19 @@ void host_sleepuntil(uint64_t nsec)
 
 int host_settimer(uint64_t nsec)
 {
-  struct itimerval it;
+  struct itimerspec tspec =
+    {
+      0
+    };
 
-  it.it_interval.tv_sec  = 0;
-  it.it_interval.tv_usec = 0;
-  it.it_value.tv_sec     = nsec / 1000000000;
-  it.it_value.tv_usec    = (nsec + 1000) / 1000;
+  /* Convert to microseconds and set minimum timer to 1 microsecond. */
 
-  return setitimer(ITIMER_REAL, &it, NULL);
+  nsec += g_start;
+
+  tspec.it_value.tv_sec  = nsec / 1000000000;
+  tspec.it_value.tv_nsec = nsec % 1000000000;
+
+  return timer_settime(g_timer, TIMER_ABSTIME, &tspec, NULL);
 }
 
 /****************************************************************************

arch/sim/src/sim/sim_internal.h

@@ -256,6 +256,7 @@ int host_unlinkshmem(const char *name);
 
 /* sim_hosttime.c ***********************************************************/
 
+int host_inittimer(void);
 uint64_t host_gettime(bool rtc);
 void host_sleep(uint64_t nsec);
 void host_sleepuntil(uint64_t nsec);

arch/sim/src/sim/win/sim_hosttime.c

@@ -44,6 +44,15 @@
  * Public Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: host_inittimer
+ ****************************************************************************/
+
+int host_inittimer(void)
+{
+  return 0;
+}
+
 /****************************************************************************
  * Name: host_gettime
  ****************************************************************************/