MCU specific sleep feature is now defined in MCU specific file.

mcu/chx-stm32f0.c

@@ -0,0 +1,41 @@
+#include <stdint.h>
+#include <mcu/cortex-m.h>
+#include <mcu/stm32.h>
+
+extern int chx_allow_sleep;
+
+void
+chx_sleep_mode (int how)
+{
+  PWR->CR |= PWR_CR_CWUF;
+  PWR->CR &= ~(PWR_CR_PDDS|PWR_CR_LPDS);
+
+  if (how == 0 || how == 1 /* Sleep only (not deepsleep) */)
+    SCB->SCR &= ~SCB_SCR_SLEEPDEEP;
+  else
+    {			   /* Deepsleep */
+      /* how == 2: deepsleep but regulator ON */
+      if (how == 3)
+	PWR->CR |= PWR_CR_LPDS;	/* regulator low-power mode */
+      else if (how == 4)
+	PWR->CR |= PWR_CR_PDDS;	/* Power down: All OFF     */
+
+      SCB->SCR |= SCB_SCR_SLEEPDEEP;
+    }
+}
+
+void __attribute__((naked))
+chx_idle (void)
+{
+  int sleep_enabled;
+
+  for (;;)
+    {
+      asm ("ldr	%0, %1" : "=r" (sleep_enabled): "m" (chx_allow_sleep));
+      if (sleep_enabled)
+	{
+	  asm volatile ("wfi" : : : "memory");
+	  /* NOTE: it never comes here.  Don't add lines after this.  */
+	}
+    }
+}