refactor(core/embed): remove unnecessary pendsv exception handling

[no changelog]

core/SConscript.firmware

@@ -295,7 +295,6 @@ SOURCE_MICROPYTHON = [
     'vendor/micropython/shared/runtime/stdout_helpers.c',
     'vendor/micropython/shared/timeutils/timeutils.c',
     'vendor/micropython/ports/stm32/gccollect.c',
-    'vendor/micropython/ports/stm32/pendsv.c',
     'vendor/micropython/py/argcheck.c',
     'vendor/micropython/py/asmarm.c',
     'vendor/micropython/py/asmbase.c',

core/embed/extmod/modtrezorio/modtrezorio-vcp.h

@@ -17,8 +17,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-void pendsv_kbd_intr(void);
-
 /// package: trezorio.__init__
 
 /// class VCP:
@@ -93,7 +91,7 @@ STATIC mp_obj_t mod_trezorio_VCP_make_new(const mp_obj_type_t *type,
   o->info.rx_buffer = m_new(uint8_t, vcp_buffer_len);
   o->info.tx_buffer_len = vcp_buffer_len;
   o->info.rx_buffer_len = vcp_buffer_len;
-  o->info.rx_intr_fn = pendsv_kbd_intr;
+  o->info.rx_intr_fn = NULL;
   o->info.rx_intr_byte = 3;  // Ctrl-C
   o->info.iface_num = (uint8_t)(iface_num);
   o->info.data_iface_num = (uint8_t)(data_iface_num);

core/embed/firmware/main.c

@@ -187,7 +187,6 @@ int main(void) {
 #endif
 
   // Init peripherals
-  pendsv_init();
 
   fault_handlers_init();
 

core/embed/trezorhal/stm32f4/irq.h

@@ -155,10 +155,7 @@ static inline void restore_irq_pri(uint32_t state) {
 
 #define IRQ_PRI_EXTINT          NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 14, 0)
 
-// PENDSV should be at the lowst priority so that other interrupts complete
-// before exception is raised.
-#define IRQ_PRI_PENDSV          NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)
-#define IRQ_PRI_RTC_WKUP        NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)
+//?#define IRQ_PRI_RTC_WKUP        NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)
 
 // !@# TAMPER interrupt priority should be probably much higher
 #define IRQ_PRI_TAMP            NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)

core/embed/trezorhal/unix/usb.c

@@ -280,8 +280,6 @@ int usb_webusb_write_blocking(uint8_t iface_num, const uint8_t *buf,
   return usb_webusb_write(iface_num, buf, len);
 }
 
-void pendsv_kbd_intr(void) {}
-
 void mp_hal_set_vcp_iface(int iface_num) {}
 
 secbool usb_configured(void) {