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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 this routine is invoked.
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* 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 for MBX860:
* Copyright (c) 1999, National Research Council of Canada
*
* $Id$
*/
#include <bsp.h>
#include <rtems/libio.h>
#include <libcsupport.h>
#include <string.h>
#ifdef STACK_CHECKER_ON
#include <stackchk.h>
#endif
/*
* 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_cpu_table Cpu_table;
char *rtems_progname;
/*
* 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 );
/*
* bsp_pretasking_hook
*
* Called when RTEMS initialization is complete but before interrupts and
* tasking are enabled. Used to setup libc and install any BSP extensions.
*
* Must not use libc (to do io) from here, since drivers are not yet
* initialized.
*
* Installed in the rtems_cpu_table defined in
* rtems/c/src/exec/score/cpu/m68k/cpu.h in main() below. Called from
* rtems_initialize_executive() defined in rtems/c/src/exec/sapi/src/init.c
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*/
void bsp_pretasking_hook(void)
{
/*
* These are assigned addresses in the linkcmds file for the BSP. This
* approach is better than having these defined as manifest constants and
* compiled into the kernel, but it is still not ideal when dealing with
* multiprocessor configuration in which each board as a different memory
* map. A better place for defining these symbols might be the makefiles.
* Consideration should also be given to developing an approach in which
* the kernel and the application can be linked and burned into ROM
* independently of each other.
*/
extern unsigned char _HeapStart;
extern unsigned char _HeapEnd;
bsp_libc_init( &_HeapStart, &_HeapEnd - &_HeapStart, 0 );
#ifdef STACK_CHECKER_ON
/*
* Initialize the stack bounds checker
* We can either turn it on here or from the app.
*/
Stack_check_Initialize();
#endif /* STACK_CHECKER_ON */
#ifdef RTEMS_DEBUG
rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );
#endif
}
/*
* 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
* MBX8xx entry point _start() defined in
* rtems/c/src/lib/libbsp/powerpc/mbx8xx/startup/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.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*/
void bsp_start(void)
{
extern void *_WorkspaceBase;
unsigned32 r1;
mmu_init();
/*
* Enable instruction and data caches. Do not force writethrough mode.
*/
#ifdef INSTRUCTION_CACHE_ENABLE
r1 = M8xx_CACHE_CMD_ENABLE;
_mtspr( M8xx_IC_CST, r1 );
_isync;
#endif
/*
* Warning: EPPCBug 1.1 chokes to death if the data cache is turned on.
* Set DATA_CACHE_ENABLE to zero in mbx8xx.cfg if EPPCBUG is used.
*/
#ifdef DATA_CACHE_ENABLE
r1 = M8xx_CACHE_CMD_ENABLE;
_mtspr( M8xx_DC_CST, r1 );
_isync;
#endif
/*
* Allocate the memory for the RTEMS Work Space. This can come from
* a variety of places: hard coded address, malloc'ed from outside
* RTEMS world (e.g. simulator or primitive memory manager), or (as
* typically done by stock BSPs) by subtracting the required amount
* of work space from the last physical address on the CPU board.
*
* In this case, the memory is not malloc'ed. It is just
* "pulled from the air".
*/
BSP_Configuration.work_space_start = (void *)&_WorkspaceBase;
/*
* initialize the CPU table for this BSP
*/
Cpu_table.pretasking_hook = bsp_pretasking_hook; /* init libc, etc. */
Cpu_table.postdriver_hook = bsp_postdriver_hook;
if( Cpu_table.interrupt_stack_size < 4 * 1024 )
Cpu_table.interrupt_stack_size = 4 * 1024;
Cpu_table.clicks_per_usec = 1; /* for 4MHz extclk */
Cpu_table.serial_per_sec = 10000000;
Cpu_table.serial_external_clock = 1;
Cpu_table.serial_xon_xoff = 0;
Cpu_table.serial_cts_rts = 1;
Cpu_table.serial_rate = 9600;
#if ( defined(mbx821_001) || defined(mbx821_001b) || defined(mbx860_001b) )
Cpu_table.clock_speed = 50000000;
Cpu_table.timer_average_overhead = 3;
Cpu_table.timer_least_valid = 3;
#else
Cpu_table.clock_speed = 40000000;
Cpu_table.timer_average_overhead = 3;
Cpu_table.timer_least_valid = 3;
#endif
/*
* Call this in case we use TERMIOS for console I/O
*/
m8xx_uart_reserve_resources( &BSP_Configuration );
m8xx.scc2.sccm=0;
m8xx.scc2p.rbase=0;
m8xx.scc2p.tbase=0;
m8xx_cp_execute_cmd( M8xx_CR_OP_STOP_TX | M8xx_CR_CHAN_SCC2 );
}
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