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/* bspstart.c
*
* This set of routines starts the application. It includes application,
* board, and monitor specific initialization and configuration. The generic
* CPU dependent initialization has been performed before any of these are
* invoked.
*
* COPYRIGHT (c) 1989-1999.
* 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.OARcorp.com/rtems/license.html.
*
* Modifications of respective RTEMS files:
* Copyright (c) 1998, National Research Council of Canada
*
* $Id$
*/
#include <string.h>
#include <bsp.h>
#include <rtems/libio.h>
#include <rtems/libcsupport.h>
#include <page_table.h>
#include <fatal.h>
/*
* The original table from the application (in ROM) and our copy of it with
* some changes. Configuration is defined in <confdefs.h>. Make sure that
* our configuration tables are uninitialized so that they get allocated in
* the .bss section (RAM).
*/
extern rtems_configuration_table Configuration;
rtems_configuration_table BSP_Configuration;
rtems_extensions_table user_extension_table;
rtems_cpu_table Cpu_table;
/*
* Use the shared implementations of the following routines.
* Look in rtems/c/src/lib/libbsp/shared/bsppost.c and
* rtems/c/src/lib/libbsp/shared/bsplibc.c.
*/
void bsp_postdriver_hook( void );
void bsp_libc_init( void *, unsigned32, int );
void bsp_pretasking_hook(void); /* m68k version */
/*
* bsp_start()
*
* Board-specific initialization code. Called from the generic boot_card()
* function defined in rtems/c/src/lib/libbsp/shared/main.c. That function
* does some of the board independent initialization. It is called from the
* generic MC680x0 entry point _start() defined in
* rtems/c/src/lib/start/m68k/start.s
*
* _start() has set up a stack, has zeroed the .bss section, has turned off
* interrupts, and placed the processor in the supervisor mode. boot_card()
* has left the processor in that state when bsp_start() was called.
*
* RUNS WITH ADDRESS TRANSLATION AND CACHING TURNED OFF!
* ASSUMES THAT THE VIRTUAL ADDRESSES WILL BE IDENTICAL TO THE PHYSICAL
* ADDRESSES. Software-controlled address translation would be required
* otherwise.
*
* ASSUMES THAT 167BUG IS PRESENT TO CATCH ANY EXCEPTIONS DURING
* INITIALIZATION.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*/
void bsp_start( void )
{
void M68KFPSPInstallExceptionHandlers (void);
extern m68k_isr_entry M68Kvec[];
extern void *_WorkspaceBase;
extern void *_RamSize;
extern unsigned long _M68k_Ramsize;
m68k_isr_entry *rom_monitor_vector_table;
int index;
_M68k_Ramsize = (unsigned long)&_RamSize; /* RAM size set in linker script */
/*
* 167Bug Vectors are at 0xFFE00000
*/
rom_monitor_vector_table = (m68k_isr_entry *)0xFFE00000;
m68k_set_vbr( rom_monitor_vector_table );
/*
* Copy 167Bug Bus Error handler into our exception vector. All 167Bug
* exception vectors are the same and point to the generalized exception
* handler. The bus error handler is the one that Motorola says to copy
* (p. 2-13, Debugging Package for Motorola 68K CISC CPUs User's Manual
* 68KBUG/D1A3, October 1993).
*/
for ( index=2 ; index<=255 ; index++ )
M68Kvec[ index ] = rom_monitor_vector_table[ 2 ];
/* Any exceptions during initialization should be trapped by 167Bug */
m68k_set_vbr( &M68Kvec );
/* Install the 68040 FPSP here */
M68KFPSPInstallExceptionHandlers();
/*
* You may wish to make the VME arbitration round-robin here, currently
* we leave it as it is.
*/
/* Set the Interrupt Base Vectors */
lcsr->vector_base = (VBR0 << 28) | (VBR1 << 24);
/*
* Initialize address translation
* May need to pass the multiprocessor configuration table.
*/
page_table_init( &Configuration );
/* We only use a hook to get the C library initialized. */
Cpu_table.pretasking_hook = bsp_pretasking_hook; /* init libc, etc. */
Cpu_table.postdriver_hook = bsp_postdriver_hook;
Cpu_table.interrupt_vector_table = (m68k_isr_entry *) &M68Kvec;
/* Must match value in start.s */
Cpu_table.interrupt_stack_size = CONFIGURE_INTERRUPT_STACK_MEMORY;
/*
* If the application has not overriden the default User_extension_table,
* supply one with our own fatal error handler that returns control to
* 167Bug.
*/
if ( BSP_Configuration.User_extension_table == NULL ) {
user_extension_table.fatal = bsp_fatal_error_occurred;
BSP_Configuration.User_extension_table = &user_extension_table;
}
/*
* Need to "allocate" the memory for the RTEMS Workspace and
* tell the RTEMS configuration where it is. This memory is
* not malloc'ed. It is just "pulled from the air".
*/
BSP_Configuration.work_space_start = (void *)&_WorkspaceBase;
}
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