/**
*
* @brief Initialize nanokernel
*
* This routine is invoked when the system is ready to run C code. The
* processor must be running in 32-bit mode, and the BSS must have been
* cleared/zeroed.
*
* @return Does not return
*/
FUNC_NORETURN void _Cstart(void)
{
/* floating point operations are NOT performed during nanokernel init */
char dummyTCS[__tTCS_NOFLOAT_SIZEOF];
/*
* Initialize nanokernel data structures. This step includes
* initializing the interrupt subsystem, which must be performed
* before the hardware initialization phase.
*/
nano_init((struct tcs *)&dummyTCS);
/* perform basic hardware initialization */
_sys_device_do_config_level(_SYS_INIT_LEVEL_PRIMARY);
/*
* Initialize random number generator
* As a platform may implement it in hardware, it has to be
* initialized after rest of hardware initialization and
* before stack canaries that use it
*/
RAND32_INIT();
/* initialize stack canaries */
STACK_CANARY_INIT();
/* display boot banner */
PRINT_BOOT_BANNER();
/* context switch to main task (entry function is _main()) */
_nano_fiber_swap();
/*
* Compiler can't tell that the above routines won't return and issues
* a warning unless we explicitly tell it that control never gets this
* far.
*/
CODE_UNREACHABLE;
}
/**
*
* @brief Initialize kernel
*
* This routine is invoked when the system is ready to run C code. The
* processor must be running in 32-bit mode, and the BSS must have been
* cleared/zeroed.
*
* @return Does not return
*/
FUNC_NORETURN void _Cstart(void)
{
#ifdef CONFIG_ARCH_HAS_CUSTOM_SWAP_TO_MAIN
void *dummy_thread = NULL;
#else
/* floating point is NOT used during kernel init */
char __stack dummy_stack[_K_THREAD_NO_FLOAT_SIZEOF];
void *dummy_thread = dummy_stack;
#endif
/*
* Initialize kernel data structures. This step includes
* initializing the interrupt subsystem, which must be performed
* before the hardware initialization phase.
*/
prepare_multithreading(dummy_thread);
/* perform basic hardware initialization */
_sys_device_do_config_level(_SYS_INIT_LEVEL_PRE_KERNEL_1);
_sys_device_do_config_level(_SYS_INIT_LEVEL_PRE_KERNEL_2);
/* initialize stack canaries */
#ifdef CONFIG_STACK_CANARIES
__stack_chk_guard = (void *)sys_rand32_get();
#endif
/* display boot banner */
PRINT_BOOT_BANNER();
switch_to_main_thread();
/*
* Compiler can't tell that the above routines won't return and issues
* a warning unless we explicitly tell it that control never gets this
* far.
*/
CODE_UNREACHABLE;
}
