blob: 4f91aa9c4e1d8733884ed73e0f6595e5f8d7f26c (
plain) (
tree)
|
|
/**
* @file
*
* @ingroup bsp_bootcard
*
* @brief Standard system startup.
*
* 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
* + obtain information on BSP memory and allocate RTEMS Workspace
* + rtems_initialize_data_structures
* + allocate memory to C Program Heap
* + initialize C Library and C Program Heap
* + bsp_pretasking_hook
* + if defined( RTEMS_DEBUG )
* - rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );
* + rtems_initialize_before_drivers
* + bsp_predriver_hook
* + rtems_initialize_device_drivers
* - all device drivers
* + bsp_postdriver_hook
* + rtems_initialize_start_multitasking
* - 1st task executes C++ global constructors
* .... appplication runs ...
* - exit
* + will not return to here
*
* This style of initialization ensures that the C++ global
* constructors are executed after RTEMS is initialized.
* Thanks to Chris Johns <cjohns@plessey.com.au> for the idea
* to move C++ global constructors into the first task.
*/
/*
* COPYRIGHT (c) 1989-2014.
* 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.org/license/LICENSE.
*/
#include <bsp/bootcard.h>
#include <rtems.h>
/*
* At most a single pointer to the cmdline for those target
* short on memory and not supporting a command line.
*/
const char *bsp_boot_cmdline;
/*
* This is the initialization framework routine that weaves together
* calls to RTEMS and the BSP in the proper sequence to initialize
* the system while maximizing shared code and keeping BSP code in C
* as much as possible.
*/
void boot_card(
const char *cmdline
)
{
rtems_interrupt_level bsp_isr_level;
/*
* Make sure interrupts are disabled.
*/
(void) bsp_isr_level;
rtems_interrupt_disable( bsp_isr_level );
bsp_boot_cmdline = cmdline;
/*
* Invoke Board Support Package initialization routine written in C.
*/
bsp_start();
/*
* Initialize the RTEMS Workspace and the C Program Heap.
*/
bsp_work_area_initialize();
/*
* Initialize RTEMS data structures
*/
rtems_initialize_data_structures();
/*
* Initialize the C library for those BSPs using the shared
* framework.
*/
bsp_libc_init();
/*
* Let the BSP do any required initialization now that RTEMS
* data structures are initialized. In older BSPs or those
* which do not use the shared framework, this is the typical
* time when the C Library is initialized so malloc()
* can be called by device drivers. For BSPs using the shared
* framework, this routine can be empty.
*/
bsp_pretasking_hook();
/*
* If debug is enabled, then enable all dynamic RTEMS debug
* capabilities.
*
* NOTE: Most debug features are conditionally compiled in
* or enabled via configure time plugins.
*/
#ifdef RTEMS_DEBUG
rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );
#endif
/*
* Let RTEMS perform initialization it requires before drivers
* are allowed to be initialized.
*/
rtems_initialize_before_drivers();
/*
* Execute BSP specific pre-driver hook. Drivers haven't gotten
* to initialize yet so this is a good chance to initialize
* buses, spurious interrupt handlers, etc..
*
* NOTE: Many BSPs do not require this handler and use the
* shared stub.
*/
bsp_predriver_hook();
/*
* Initialize all device drivers.
*/
rtems_initialize_device_drivers();
/*
* Invoke the postdriver hook. This normally opens /dev/console
* for use as stdin, stdout, and stderr.
*/
bsp_postdriver_hook();
/*
* Complete initialization of RTEMS and switch to the first task.
* Global C++ constructors will be executed in the context of that task.
*/
rtems_initialize_start_multitasking();
/***************************************************************
***************************************************************
* APPLICATION RUNS NOW!!! We will not return to here!!! *
***************************************************************
***************************************************************/
}
|