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https://gitlab.rtems.org/rtems/rtos/rtems.git
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162 lines
4.2 KiB
C
162 lines
4.2 KiB
C
/*
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* This is the C entry point for ALL RTEMS BSPs. It is invoked
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* from the assembly language initialization file usually called
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* start.S. It provides the framework for the BSP initialization
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* sequence. The basic flow of initialization is:
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*
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* + start.S: basic CPU setup (stack, zero BSS)
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* + boot_card
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* + bspstart.c: bsp_start - more advanced initialization
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* + rtems_initialize_executive_early
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* + all device drivers
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* + rtems_initialize_executive_late
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* + 1st task executes C++ global constructors
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* .... appplication runs ...
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* + exit
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* + back to here eventually
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* + bspclean.c: bsp_cleanup
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*
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* This style of initialization insures that the C++ global
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* constructors are executed after RTEMS is initialized.
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*
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* Thanks to Chris Johns <cjohns@plessey.com.au> for this idea.
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*
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* COPYRIGHT (c) 1989-2006.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#include <bsp.h>
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#if defined(__USE_INIT_FINI__)
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#include <stdlib.h> /* for atexit() */
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#endif
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extern void bsp_start( void );
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extern void bsp_cleanup( void );
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extern rtems_configuration_table Configuration;
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extern rtems_configuration_table BSP_Configuration;
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extern rtems_cpu_table Cpu_table;
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rtems_api_configuration_table BSP_RTEMS_Configuration;
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#ifdef RTEMS_POSIX_API
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posix_api_configuration_table BSP_POSIX_Configuration;
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#endif
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/* Initialize C++ global Ctor/Dtor and initializes exception handling. */
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#if defined(__USE_INIT_FINI__)
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extern void _fini( void );
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#endif
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rtems_interrupt_level bsp_isr_level;
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/*
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* Since there is a forward reference
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*/
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char *rtems_progname;
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int boot_card(int argc, char **argv, char **envp)
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{
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static char *argv_pointer = NULL;
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static char *envp_pointer = NULL;
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char **argv_p = &argv_pointer;
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char **envp_p = &envp_pointer;
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/*
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* Set things up so c_rtems_main() is called with real pointers for
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* argv and envp. If the BSP has passed us something useful, then
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* pass it on. Somehow we need to eventually make this available to
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* a real main() in user land. :)
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*/
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if ( argv )
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argv_p = argv;
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if ( envp )
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envp_p = envp;
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/*
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* Set default values for the CPU Table fields all ports must have.
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* These values can be overridden in bsp_start() but they are
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* right most of the time.
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*/
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Cpu_table.pretasking_hook = NULL;
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Cpu_table.predriver_hook = NULL;
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Cpu_table.postdriver_hook = NULL;
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Cpu_table.idle_task = NULL;
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Cpu_table.do_zero_of_workspace = TRUE;
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Cpu_table.interrupt_stack_size = RTEMS_MINIMUM_STACK_SIZE;
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Cpu_table.extra_mpci_receive_server_stack = 0;
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Cpu_table.stack_allocate_hook = NULL;
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Cpu_table.stack_free_hook = NULL;
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/*
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* Copy the configuration table so we and the BSP wants to change it.
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*/
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BSP_Configuration = Configuration;
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BSP_RTEMS_Configuration = *Configuration.RTEMS_api_configuration;
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BSP_Configuration.RTEMS_api_configuration = &BSP_RTEMS_Configuration;
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#ifdef RTEMS_POSIX_API
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BSP_POSIX_Configuration = *Configuration.POSIX_api_configuration;
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BSP_Configuration.POSIX_api_configuration = &BSP_POSIX_Configuration;
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#endif
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/*
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* Invoke Board Support Package initialization routine written in C.
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*/
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bsp_start();
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/*
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* Initialize RTEMS but do NOT start multitasking.
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*/
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bsp_isr_level =
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rtems_initialize_executive_early( &BSP_Configuration, &Cpu_table );
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/*
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* The atexit hook will be before the static destructor list's entry
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* point.
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*/
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#if defined(__USE_INIT_FINI__)
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atexit( _fini );
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#endif
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/*
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* Call c_rtems_main() and eventually let the first task or the real
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* main() invoke the global constructors if there are any.
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*/
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if ((argc > 0) && argv && argv[0])
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rtems_progname = argv[0];
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else
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rtems_progname = "RTEMS";
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rtems_initialize_executive_late( bsp_isr_level );
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/*
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* Perform any BSP specific shutdown actions.
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*/
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bsp_cleanup();
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/*
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* Now return to the start code.
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*/
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return 0;
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}
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