feat(core): measure systick with systemview

core/embed/firmware/systemview.h

@@ -4,8 +4,13 @@
 
 #ifdef SYSTEM_VIEW
 
+#include "SEGGER_SYSVIEW.h"
+
 void enable_systemview();
 
+#else
+#define SEGGER_SYSVIEW_RecordEnterISR() do {} while(0)
+#define SEGGER_SYSVIEW_RecordExitISR() do {} while(0)
 #endif
 
 #endif //CORE_SYSTEMVIEW_H

core/embed/trezorhal/systick.c

@@ -52,11 +52,14 @@
   #include "rdi.h"
 #endif
 
+#include "systemview.h"
+
 extern __IO uint32_t uwTick;
 
 systick_dispatch_t systick_dispatch_table[SYSTICK_DISPATCH_NUM_SLOTS];
 
 void SysTick_Handler(void) {
+  SEGGER_SYSVIEW_RecordEnterISR();
   // this is a millisecond tick counter that wraps after approximately
   // 49.71 days = (0xffffffff / (24 * 60 * 60 * 1000))
   uint32_t uw_tick = uwTick + 1;
@@ -68,4 +71,5 @@ void SysTick_Handler(void) {
   if (f != NULL) {
     f(uw_tick);
   }
+  SEGGER_SYSVIEW_RecordExitISR();
 }