source: rtems/bsps/powerpc/qemuppc/start/bspstart.c @ a29b9bb4

/* SPDX-License-Identifier: BSD-2-Clause */

/*
 *  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).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#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[];
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;
}

uint32_t _CPU_Counter_frequency(void)
{
  return bsp_time_base_frequency;
}

/*
 *  bsp_start
 *
 *  This routine does the bulk of the system initialization.
 */

void bsp_start( void )
{
  rtems_status_code sc = RTEMS_SUCCESSFUL;

  /*
   * 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;

  BSP_mem_size = (uint32_t )RamSize;

  ppc_exc_initialize();

  /* Install default handler for the decrementer exception */
  sc = ppc_exc_set_handler( ASM_DEC_VECTOR, default_decrementer_exception_handler);
  if (sc != RTEMS_SUCCESSFUL) {
    rtems_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
}