/*
* 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) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* All rights 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.
*
* $Id$
*/
#include <bsp.h>
#include <rtems/libio.h>
#include <libcsupport.h>
#include <string.h>
#include <fcntl.h>
/*
* The original table from the application and our copy of it with
* some changes.
*/
extern rtems_configuration_table Configuration;
rtems_configuration_table BSP_Configuration;
rtems_cpu_table Cpu_table;
rtems_unsigned32 bsp_isr_level;
/*
* Tells us where to put the workspace in case remote debugger is present.
*/
#if 0
extern rtems_unsigned32 rdb_start;
#endif
/*
* Amount to increment itimer by each pass
* It is a variable instead of a #define to allow the 'looptest'
* script to bump it without recompiling rtems
*
* NOTE: This is based on the PA-RISC simulator. I don't know if we
* can actually pull this trick on the PPC simulator.
*/
rtems_unsigned32 CPU_PPC_CLICKS_PER_TICK;
#if PSIM_FAST_IDLE
/*
* Many of the tests are very slow on the simulator because they have
* have 5 second delays hardwired in.
*
* Try to speed those tests up by speeding up the clock when in the idle task.
*
* NOTE: At the current setting, 5 second delays in the tests take
* approximately 5 seconds of wall time.
*/
rtems_extension fast_idle_switch_hook(
rtems_tcb *current_task,
rtems_tcb *heir_task
)
{
static rtems_unsigned32 normal_clock = ~0;
static rtems_unsigned32 fast_clock;
/* init our params on first call */
if (normal_clock == (rtems_unsigned32) ~0)
{
normal_clock = CPU_PPC_CLICKS_PER_TICK;
fast_clock = 10000;
#if 0
fast_clock = CPU_PPC_CLICKS_PER_TICK / 0x10 ;
#endif
if (fast_clock == 0) /* handle pathological case */
fast_clock++;
}
/*
* Run the clock faster when idle is in place.
*/
if (heir_task == _Thread_Idle)
CPU_PPC_CLICKS_PER_TICK = fast_clock;
else if (current_task == _Thread_Idle)
CPU_PPC_CLICKS_PER_TICK = normal_clock;
}
#endif
/*
* Use the shared implementations of the following routines
*/
void bsp_postdriver_hook(void);
void bsp_libc_init( void *, unsigned32, int );
/*
* bsp_pretasking_hook
*
* BSP pretasking hook. Called just before drivers are initialized.
* Used to setup libc and install any BSP extensions.
*/
void bsp_pretasking_hook(void)
{
extern int end;
rtems_unsigned32 heap_start;
rtems_unsigned32 heap_size;
heap_start = (rtems_unsigned32) &end;
if (heap_start & (CPU_ALIGNMENT-1))
heap_start = (heap_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);
heap_size = BSP_Configuration.work_space_start - (void *)&end;
heap_size &= 0xfffffff0; /* keep it as a multiple of 16 bytes */
bsp_libc_init((void *) heap_start, heap_size, 0);
#if PSIM_FAST_IDLE
/*
* Install the fast idle task switch extension
*
* On MP systems, might not want to do this; it confuses at least
* one test (mp06) on the PA-RISC simulator
*/
#if 0
if (BSP_Configuration.User_multiprocessing_table == 0)
#endif
{
rtems_extensions_table fast_idle_extension;
rtems_id extension_id;
rtems_status_code rc;
memset(&fast_idle_extension, 0, sizeof(fast_idle_extension));
fast_idle_extension.thread_switch = fast_idle_switch_hook;
rc = rtems_extension_create(
rtems_build_name('F', 'D', 'L', 'E'),
&fast_idle_extension,
&extension_id
);
if (rc != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(rc);
}
#endif
#ifdef RTEMS_DEBUG
rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );
#endif
}
/*
* bsp_start
*
* This routine does the bulk of the system initialization.
*/
void bsp_start( void )
{
unsigned char *work_space_start;
#if 0
/*
* Set MSR to show vectors at 0 XXX
*/
_CPU_MSR_Value( msr_value );
msr_value &= ~PPC_MSR_EP;
_CPU_MSR_SET( msr_value );
#endif
/*
* Set up our hooks
* Make sure libc_init is done before drivers initialized so that
* they can use atexit()
*/
Cpu_table.pretasking_hook = bsp_pretasking_hook; /* init libc, etc. */
Cpu_table.postdriver_hook = bsp_postdriver_hook;
/*
* Is this true?
*
* PSIM does zero out memory BUT only when IT begins execution. Thus
* if we want to have a clean slate in the workspace each time we
* begin execution of OUR application, then we must zero the workspace.
*
* It is true that it takes simulated time to clear the memory.
*/
Cpu_table.do_zero_of_workspace = FALSE;
Cpu_table.interrupt_stack_size = (12 * 1024);
/*
* The monitor likes the exception table to be at 0x0.
*/
Cpu_table.exceptions_in_RAM = TRUE;
/*
#if defined(RTEMS_POSIX_API)
BSP_Configuration.work_space_size *= 3;
#endif
*/
BSP_Configuration.work_space_size += 1024;
#if 0
work_space_start =
(unsigned char *)rdb_start - BSP_Configuration.work_space_size;
#endif
work_space_start =
(unsigned char *)&RAM_END - BSP_Configuration.work_space_size;
if ( work_space_start <= (unsigned char *)&end ) {
DEBUG_puts( "bspstart: Not enough RAM!!!\n" );
bsp_cleanup();
}
BSP_Configuration.work_space_start = work_space_start;
/*
* Account for the console's resources
*/
console_reserve_resources( &BSP_Configuration );
#if PSIM_FAST_IDLE
/*
* Add 1 extension for fast idle
*/
BSP_Configuration.maximum_extensions++;
#endif
/*
* Set the "clicks per tick" for the simulator
* used by XXX/clock/clock.c to schedule interrupts
*
* NOTE: On psim, each click of the decrementer register corresponds
* to 1 instruction. By setting this to 100, we are indicating
* that we are assuming it can execute 100 instructions per
* microsecond. This corresponds to sustaining 1 instruction
* per cycle at 100 Mhz. Whether this is a good guess or not
* is anyone's guess.
*/
{
extern int PSIM_INSTRUCTIONS_PER_MICROSECOND;
CPU_PPC_CLICKS_PER_TICK = BSP_Configuration.microseconds_per_tick *
(int) &PSIM_INSTRUCTIONS_PER_MICROSECOND;
}
}
