From 4c54db68bd37ebe4f6a995e69bace6529a0cdaec Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Sat, 4 Jul 2015 07:22:38 -0600
Subject: [PATCH] Implementment board_power_off() for the simulation platform.

---
 ChangeLog              |  2 ++
 arch/Kconfig           |  1 +
 arch/sim/src/up_head.c | 57 +++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index dd680489c5..10693ce3bb 100755
--- a/ChangeLog
+++ b/ChangeLog
@@ -10663,3 +10663,5 @@
 	* sched/sched/sched_waitpid.c: Implement WNOHANG for waitpid() only and
 	  for the case of CONFIG_SCHED_HAVE_PARENT not selected.  From Max
 	  Neklyudov (2015-07-02).
+	* arch/sim/src/up_head.S: Implement board_power_off() for the simulation
+	  platform (2015-07-04).
diff --git a/arch/Kconfig b/arch/Kconfig
index ff47215965..b34385c708 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -54,6 +54,7 @@ config ARCH_SH
 config ARCH_SIM
 	bool "Simulation"
 	select ARCH_HAVE_TICKLESS
+	select ARCH_HAVE_POWEROFF
 	---help---
 		Linux/Cywgin user-mode simulation.
 
diff --git a/arch/sim/src/up_head.c b/arch/sim/src/up_head.c
index 24c7646360..2b9fdb4598 100644
--- a/arch/sim/src/up_head.c
+++ b/arch/sim/src/up_head.c
@@ -47,6 +47,7 @@
 
 #include <nuttx/init.h>
 #include <nuttx/arch.h>
+#include <nuttx/board.h>
 #include <nuttx/power/pm.h>
 
 /****************************************************************************
@@ -54,11 +55,20 @@
  ****************************************************************************/
 
 static jmp_buf sim_abort;
+static int retcode = 0;
 
 /****************************************************************************
  * Global Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: main
+ *
+ * Description:
+ *   This is the main entry point into the simulation.
+ *
+ ****************************************************************************/
+
 int main(int argc, char **argv, char **envp)
 {
   /* Power management should be initialized early in the (simulated) boot
@@ -75,16 +85,61 @@ int main(int argc, char **argv, char **envp)
     {
       os_start();
     }
-  return 0;
+
+  return retcode;
 }
 
+/****************************************************************************
+ * Name: up_assert
+ *
+ * Description:
+ *   Called to terminate the simulation abnormally in the event of a failed
+ *   assertion.
+ *
+ ****************************************************************************/
+
 void up_assert(const uint8_t *filename, int line)
 {
+  /* Show the location of the failed assertion */
+
   fprintf(stderr, "Assertion failed at file:%s line: %d\n", filename, line);
 
+  /* Allow for any board/configuration specific crash information */
+
 #ifdef CONFIG_BOARD_CRASHDUMP
   board_crashdump(up_getsp(), g_readytorun.head, filename, line);
 #endif
 
+  /* Exit the simulation */
+
+  retcode = EXIT_FAILURE;
   longjmp(sim_abort, 1);
 }
+
+/****************************************************************************
+ * Name: board_power_off
+ *
+ * Description:
+ *   Power off the board.  This function may or may not be supported by a
+ *   particular board architecture.
+ *
+ * Input Parameters:
+ *   status - Status information provided with the power off event.
+ *
+ * Returned Value:
+ *   If this function returns, then it was not possible to power-off the
+ *   board due to some constraints.  The return value int this case is a
+ *   board-specific reason for the failure to shutdown.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_BOARDCTL_POWEROFF
+int board_power_off(int status)
+{
+  /* Save the return code and exit the simulation */
+
+  retcode = status;
+  longjmp(sim_abort, 1);
+}
+#endif
+