source: rtems/c/src/lib/libbsp/hppa1.1/simhppa/shmsupp/getcfg.c @ ac7d5ef0

/*  void Shm_Get_configuration( localnode, &shmcfg )
 *
 *  This routine initializes, if necessary, and returns a pointer
 *  to the Shared Memory Configuration Table for the HP PA-RISC
 *  simulator.
 *
 *  INPUT PARAMETERS:
 *    localnode - local node number
 *    shmcfg    - address of pointer to SHM Config Table
 *
 *  OUTPUT PARAMETERS:
 *    *shmcfg   - pointer to SHM Config Table
 *
 *  NOTES:  The MP interrupt used is the Runway bus' ability to directly
 *          address the control registers of up to four CPUs and cause
 *          interrupts on them.
 *
 *          The following table illustrates the configuration limitations:
 *
 *                                   BUS     MAX
 *                          MODE    ENDIAN  NODES
 *                        ========= ====== =======
 *                         POLLED    BIG    2+
 *                        INTERRUPT  BIG    2..4 (on Runway)
 *
 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
 *  On-Line Applications Research Corporation (OAR).
 *  All rights assigned to U.S. Government, 1994.
 *
 *  This material may be reproduced by or for the U.S. Government pursuant
 *  to the copyright license under the clause at DFARS 252.227-7013.  This
 *  notice must appear in all copies of this file and its derivatives.
 *
 *  $Id$
 */

#include <bsp.h>
#include <runway.h>

#include "shm.h"

#define INTERRUPT 0        /* can be interrupt or polling */
#define POLLING   1

shm_config_table BSP_shm_cfgtbl;

void Shm_Cause_interrupt_simhppa(
  rtems_unsigned32 node
);

void Shm_Get_configuration(
  rtems_unsigned32   localnode,
  shm_config_table **shmcfg
)
{
   BSP_shm_cfgtbl.base         = (vol_u32 *) 0x44000000;
   BSP_shm_cfgtbl.length       = 16 * KILOBYTE;
   BSP_shm_cfgtbl.format       = SHM_BIG;

   BSP_shm_cfgtbl.cause_intr   = Shm_Cause_interrupt_simhppa;

#ifdef NEUTRAL_BIG
   BSP_shm_cfgtbl.convert      = NULL_CONVERT;
#else
   BSP_shm_cfgtbl.convert      = CPU_swap_u32;
#endif

#if ( POLLING == 1 )
   BSP_shm_cfgtbl.poll_intr    = POLLED_MODE;
   BSP_shm_cfgtbl.Intr.address = NO_INTERRUPT;
   BSP_shm_cfgtbl.Intr.value   = NO_INTERRUPT;
   BSP_shm_cfgtbl.Intr.length  = NO_INTERRUPT;
#else
   BSP_shm_cfgtbl.poll_intr    = INTR_MODE;
   BSP_shm_cfgtbl.Intr.address =
        (vol_u32 *) (HPPA_RUNWAY_HPA( localnode - 1) +
                     HPPA_RUNWAY_REG_IO_EIR_OFFSET);
   BSP_shm_cfgtbl.Intr.value   = HPPA_INTERRUPT_EXTERNAL_MPCI;
   BSP_shm_cfgtbl.Intr.length  = LONG;
#endif

   *shmcfg = &BSP_shm_cfgtbl;
}