/*
* 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) 1989-2008.
* 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.
*/
#include <string.h>
#include <fcntl.h>
#include <rtems/counter.h>
#include <libcpu/bat.h>
#include <libcpu/spr.h>
#include <libcpu/powerpc-utility.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/vectors.h>
#include <bsp/bootcard.h>
#include <bsp/irq-generic.h>
/*
* CPU Bus Frequency
*/
unsigned int BSP_bus_frequency;
/* Configuration parameter for clock driver */
uint32_t bsp_time_base_frequency;
/* Legacy */
uint32_t bsp_clicks_per_usec;
/*
* Memory on this board.
*/
extern char RamSize[];
extern char bsp_interrupt_stack_start[];
extern char bsp_interrupt_stack_end[];
extern char bsp_interrupt_stack_size[];
uint32_t BSP_mem_size = (uint32_t)RamSize;
/* Default decrementer exception handler */
static int default_decrementer_exception_handler( BSP_Exception_frame *frame, unsigned number)
{
ppc_set_decrementer_register(UINT32_MAX);
return 0;
}
/*
* bsp_start
*
* This routine does the bulk of the system initialization.
*/
void bsp_start( void )
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
uintptr_t intrStackStart;
uintptr_t intrStackSize;
/*
* Note we can not get CPU identification dynamically, so
* force current_ppc_cpu.
*/
current_ppc_cpu = PPC_PSIM;
/*
* initialize the device driver parameters
* assume we are running with 20MHz bus
* this should speed up some tests :-)
*/
BSP_bus_frequency = 20;
bsp_time_base_frequency = 20000000;
bsp_clicks_per_usec = BSP_bus_frequency;
rtems_counter_initialize_converter(bsp_time_base_frequency);
/*
* Initialize the interrupt related settings.
*/
intrStackStart = (uintptr_t) bsp_interrupt_stack_start;
intrStackSize = (uintptr_t) bsp_interrupt_stack_size;
BSP_mem_size = (uint32_t )RamSize;
/*
* Initialize default raw exception handlers.
*/
ppc_exc_initialize(
PPC_INTERRUPT_DISABLE_MASK_DEFAULT,
intrStackStart,
intrStackSize
);
/* Install default handler for the decrementer exception */
sc = ppc_exc_set_handler( ASM_DEC_VECTOR, default_decrementer_exception_handler);
if (sc != RTEMS_SUCCESSFUL) {
BSP_panic("cannot install decrementer exception handler");
}
/* Initalize interrupt support */
bsp_interrupt_initialize();
#if 0
/*
* Setup BATs and enable MMU
*/
/* Memory */
setdbat(0, 0x0<<24, 0x0<<24, 2<<24, _PAGE_RW);
setibat(0, 0x0<<24, 0x0<<24, 2<<24, 0);
/* PCI */
setdbat(1, 0x8<<24, 0x8<<24, 1<<24, IO_PAGE);
setdbat(2, 0xc<<24, 0xc<<24, 1<<24, IO_PAGE);
_write_MSR(_read_MSR() | MSR_DR | MSR_IR);
__asm__ volatile("sync; isync");
#endif
}
