source: rtems/c/src/lib/libbsp/sparc/leon3/startup/bspstart.c @ 24bf11e

/*
 *  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) 1989-2013.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  Modified for LEON3 BSP.
 *  COPYRIGHT (c) 2004.
 *  Gaisler Research.
 *
 *  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 <bsp.h>
#include <leon.h>
#include <rtems/bspIo.h>
#include <bsp/bootcard.h>

/*
 * Tells us if data cache snooping is available
 */
int CPU_SPARC_HAS_SNOOPING;

/* Index of CPU, in an AMP system CPU-index may be non-zero */
int LEON3_Cpu_Index = 0;

extern void amba_initialize(void);

/*
 * set_snooping
 *
 * Read the data cache configuration register to determine if
 * bus snooping is available and enabled. This is needed for some
 * drivers so that they can select the most efficient copy routines.
 *
 */

static inline int set_snooping(void)
{
  int tmp;
  __asm__ (" lda [%%g0] 2, %0 "
      : "=r"(tmp)
      :
  );
  return (tmp >> 23) & 1;
}

/* ASM-function used to get the CPU-Index on calling LEON3 CPUs */
static inline unsigned int get_asr17(void)
{
  unsigned int reg;
  __asm__ (" mov %%asr17, %0 " : "=r"(reg) :);
  return reg;
}

/*
 *  bsp_start
 *
 *  This routine does the bulk of the system initialization.
 */
void bsp_start( void )
{
  CPU_SPARC_HAS_SNOOPING = set_snooping();

  /* Get the LEON3 CPU index, normally 0, but for MP systems we do
   * _not_ assume that this is CPU0. One may run another OS on CPU0
   * and RTEMS on this CPU, and AMP system with mixed operating
   * systems
   */
  LEON3_Cpu_Index = (get_asr17() >> 28) & 3;

  /* Scan AMBA Plug&Play and parse it into a RAM description (ambapp_plb),
   * find GPTIMER for bus frequency, find IRQ Controller and initialize
   * interrupt support
   */
  amba_initialize();
  leon3_cpu_counter_initialize();

  /* find debug UART for printk() */
  bsp_debug_uart_init();
}