init.c

#include "user_app_info.h"
 
int start(int MCULIBHANDLE, struct sc_firmware_api *api);
 
// the linker script provides the ram & flash areas
extern uint32_t _sidata;
extern uint32_t _sdata;
extern uint32_t _edata;
extern uint32_t _sbss;
extern uint32_t _ebss;
extern int MCULIBHANDLE;
extern struct userapp_info userapp_vector;
 
struct userapp_info *get_userapp_vector() {
  return &userapp_vector;
}
 
 
/*
 * called before start(). Since we have no runtime, we'll have to do some
 * stuff ourselves. For example, initialise the variables in ram from flash to
 * their default values (_sidata flash region contains the default values, which need to be copied to ram position _sdata)
 */
int start_and_init(int MCULIB_HANDLE, struct sc_firmware_api *api) {
  uint8_t *s;
  uint8_t *t;
 
  s = (uint8_t *)&_sidata;
  t = (uint8_t *)&_sdata;
 
#ifdef __unix
  if (_sidata != 0) {
    for (;;) {
      *t = *s;
      t++;
      s++;
      if (t >= ((uint8_t *)&_edata)) {
        break;
      }
    }
  }
 
  if (_sbss != 0) {
    s = (uint8_t *)&_sbss;
    t = (uint8_t *)&_ebss;
    for (;;) {
      *s = 0;
      s++;
      if (s >= t) {
        break;
      }
    }
  }
 
#else
  for (;;) {
    *t = *s;
    t++;
    s++;
    if (t >= ((uint8_t *)&_edata)) {
      break;
    }
  }
 
  s = (uint8_t *)&_sbss;
  t = (uint8_t *)&_ebss;
  for (;;) {
    *s = 0;
    s++;
    if (s >= t) {
      break;
    }
  }
 
#endif
 
  MCULIBHANDLE = MCULIB_HANDLE;
  get_userapp_vector();
  return start(MCULIBHANDLE, api);
}