/* * 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 * + if defined(BSP_BOOTCARD_HANDLES_RAM_ALLOCATION) * - obtain information on BSP memory and allocate RTEMS Workspace * + bspstart.c: bsp_start - more advanced initialization * + rtems_initialize_data_structures * + if defined(BSP_BOOTCARD_HANDLES_RAM_ALLOCATION) * - 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 * + back to here eventually * + bspclean.c: bsp_cleanup * * This style of initialization ensures that the C++ global * constructors are executed after RTEMS is initialized. * Thanks to Chris Johns for the idea * to move C++ global constructors into the first task. * * COPYRIGHT (c) 1989-2008. * 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 /* * Since there is a forward reference */ char *rtems_progname; /* * Prototypes of external routines */ extern void bsp_start( void ); extern void bsp_cleanup( void ); extern void bsp_pretasking_hook(void); extern void bsp_libc_init( void *, uint32_t, int ); extern void bsp_predriver_hook(void); extern void bsp_postdriver_hook(void); /* * These are the prototypes and helper routines which are used * when the BSP lets the framework handle RAM allocation between * the RTEMS Workspace and C Program Heap. */ #if defined(BSP_BOOTCARD_HANDLES_RAM_ALLOCATION) extern void bsp_get_workarea( void **, size_t *, size_t *); void bootcard_bsp_libc_helper( void *workarea_base, size_t workarea_size, size_t requested_heap_size ) { uint32_t heap_start; uint32_t heap_size; heap_start = (uint32_t) workarea_base; if (heap_start & (CPU_ALIGNMENT-1)) heap_start = (heap_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1); if ( requested_heap_size == 0 ) { heap_size = Configuration.work_space_start - workarea_base; heap_size &= 0xfffffff0; /* keep it as a multiple of 16 bytes */ } else { heap_size = requested_heap_size; } bsp_libc_init((void *) heap_start, heap_size, 0); } #endif /* * 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. */ 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; rtems_interrupt_level bsp_isr_level; #if defined(BSP_BOOTCARD_HANDLES_RAM_ALLOCATION) void *workarea_base; size_t workarea_size; size_t heap_size; #endif /* * Make sure interrupts are disabled. */ rtems_interrupt_disable( bsp_isr_level ); /* * Set things up so we have 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; /* * Set the program name in case some application cares. */ if ((argc > 0) && argv && argv[0]) rtems_progname = argv[0]; else rtems_progname = "RTEMS"; /* * Find out where the block of memory the BSP will use for * the RTEMS Workspace and the C Program Heap is. */ #if defined(BSP_BOOTCARD_HANDLES_RAM_ALLOCATION) { unsigned char *work_space_start; bsp_get_workarea( &workarea_base, &workarea_size, &heap_size ); work_space_start = workarea_base + workarea_size - rtems_configuration_get_work_space_size(); if ( work_space_start <= (unsigned char *)workarea_base ) { printk( "bootcard: Not enough RAM!!!\n" ); bsp_cleanup(); return -1; } Configuration.work_space_start = work_space_start; #if (BSP_DIRTY_MEMORY == 1) memset(workarea_base, 0xCF, workarea_size); #endif } #endif /* * Invoke Board Support Package initialization routine written in C. */ bsp_start(); /* * Initialize RTEMS data structures */ rtems_initialize_data_structures( &Configuration ); /* * Initialize the C library for those BSPs using the shared * framework. */ #if defined(BSP_BOOTCARD_HANDLES_RAM_ALLOCATION) bootcard_bsp_libc_helper( workarea_base, workarea_size, heap_size ); #endif /* * All BSP to 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(); /* * 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 HERE!!! When it shuts down, we return!!! * *************************************************************** *************************************************************** */ /* * Perform any BSP specific shutdown actions which are written in C. */ bsp_cleanup(); /* * Now return to the start code. */ return 0; }