altos: Use separate exception stack on STM32L

[fw/altos] / src / stm / ao_arch_funcs.h

diff --git a/src/stm/ao_arch_funcs.h b/src/stm/ao_arch_funcs.h
index d17793076f38ca177e60f66082288c607044d1b5..f3d68202303a1844e180b7b846873999275aa417 100644 (file)
--- a/src/stm/ao_arch_funcs.h
+++ b/src/stm/ao_arch_funcs.h
@@ -317,6 +317,19 @@ static inline void ao_arch_restore_stack(void) {
        asm("bx lr");
 }
 
+#define HAS_ARCH_START_SCHEDULER       1
+
+static inline void ao_arch_start_scheduler(void) {
+       uint32_t        sp;
+       uint32_t        control;
+
+       asm("mrs %0,msp" : "=&r" (sp));
+       asm("msr psp,%0" : : "r" (sp));
+       asm("mrs %0,control" : "=&r" (control));
+       control |= (1 << 1);
+       asm("msr control,%0" : : "r" (control));
+}
+
 #define ao_arch_isr_stack()
 
 #define ao_arch_wait_interrupt() do {                  \