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/*
* This is the C entry point for ALL RTEMS BSPs. It is invoked
* from the assembly language initialization file usually called
* start.S. It provides the framework for the BSP initialization
* sequence. The basic flow of initialization is:
*
* + start.S: basic CPU setup (stack, zero BSS)
* + boot_card
* + bspstart.c: bsp_start - more advanced initialization
* + rtems_initialize_executive_early
* + all device drivers
* + rtems_initialize_executive_late
* + 1st task executes C++ global constructors
* .... appplication runs ...
* + exit
* + back to here eventually
* + bspclean.c: bsp_cleanup
*
* This style of initialization insures that the C++ global
* constructors are executed after RTEMS is initialized.
*
* Thanks to Chris Johns <cjohns@plessey.com.au> for this idea.
*
* COPYRIGHT (c) 1989-2006.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <bsp.h>
extern void bsp_start( void );
extern void bsp_cleanup( void );
extern rtems_configuration_table Configuration;
extern rtems_configuration_table BSP_Configuration;
rtems_api_configuration_table BSP_RTEMS_Configuration;
#ifdef RTEMS_POSIX_API
posix_api_configuration_table BSP_POSIX_Configuration;
#endif
rtems_interrupt_level bsp_isr_level;
/*
* Since there is a forward reference
*/
char *rtems_progname;
int boot_card(int argc, char **argv, char **envp)
{
static char *argv_pointer = NULL;
static char *envp_pointer = NULL;
char **argv_p = &argv_pointer;
char **envp_p = &envp_pointer;
/*
* Set things up so c_rtems_main() is called with real pointers for
* argv and envp. If the BSP has passed us something useful, then
* pass it on. Somehow we need to eventually make this available to
* a real main() in user land. :)
*/
if ( argv )
argv_p = argv;
if ( envp )
envp_p = envp;
/*
* Copy the configuration table so we and the BSP wants to change it.
*/
BSP_Configuration = Configuration;
BSP_RTEMS_Configuration = *Configuration.RTEMS_api_configuration;
BSP_Configuration.RTEMS_api_configuration = &BSP_RTEMS_Configuration;
#ifdef RTEMS_POSIX_API
BSP_POSIX_Configuration = *Configuration.POSIX_api_configuration;
BSP_Configuration.POSIX_api_configuration = &BSP_POSIX_Configuration;
#endif
/*
* Invoke Board Support Package initialization routine written in C.
*/
bsp_start();
/*
* Initialize RTEMS but do NOT start multitasking.
*/
bsp_isr_level = rtems_initialize_executive_early( &BSP_Configuration );
/*
* Call c_rtems_main() and eventually let the first task or the real
* main() invoke the global constructors if there are any.
*/
if ((argc > 0) && argv && argv[0])
rtems_progname = argv[0];
else
rtems_progname = "RTEMS";
rtems_initialize_executive_late( bsp_isr_level );
/***************************************************************
***************************************************************
* APPLICATION RUNS HERE!!! When it shuts down, we return!!! *
***************************************************************
***************************************************************
*/
/*
* Perform any BSP specific shutdown actions.
*/
bsp_cleanup();
/*
* Now return to the start code.
*/
return 0;
}
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