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/* void Shm_get_config( localnode, &shmcfg )
*
* This routine initializes, if necessary, and returns a pointer
* to the Shared Memory Configuration Table for the UNIX
* 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
*
* 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 <rtems.h>
#include <shm.h>
#include <bsp.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/sem.h>
#define INTERRUPT 0 /* can be interrupt or polling */
#define POLLING 1
shm_config_table BSP_shm_cfgtbl;
int semid;
void Shm_Cause_interrupt_unix(
rtems_unsigned32 node
);
void Shm_Get_configuration(
rtems_unsigned32 localnode,
shm_config_table **shmcfg
)
{
rtems_unsigned32 maximum_nodes;
int i;
int shmid;
char *shm_addr;
key_t shm_key;
key_t sem_key;
struct sembuf sb;
int status;
shm_key = 0xa000;
shmid = shmget(shm_key, 16 * KILOBYTE, IPC_CREAT | 0660);
if ( shmid == -1 ) {
perror( "shmget" );
exit( 0 );
}
shm_addr = shmat(shmid, (char *)0, SHM_RND);
if ( shm_addr == (void *)-1 ) {
perror( "shmat" );
exit( 0 );
}
sem_key = 0xa001;
maximum_nodes = Shm_RTEMS_MP_Configuration->maximum_nodes;
semid = semget(sem_key, maximum_nodes + 1, IPC_CREAT | 0660);
if ( semid == -1 ) {
perror( "semget" );
exit( 0 );
}
if ( Shm_Is_master_node() ) {
for ( i=0 ; i <= maximum_nodes ; i++ ) {
sb.sem_op = 1;
sb.sem_num = i;
sb.sem_flg = 0;
status = semop( semid, &sb, 1 );
if ( status == -1 ) {
fprintf( stderr, "Sem init failed %d\n", errno ); fflush( stderr );
exit( 0 );
}
}
}
BSP_shm_cfgtbl.base = (vol_u32 *)shm_addr;
BSP_shm_cfgtbl.length = 16 * KILOBYTE;
BSP_shm_cfgtbl.format = SHM_BIG;
BSP_shm_cfgtbl.cause_intr = Shm_Cause_interrupt_unix;
#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 = 0; /* process id? */
BSP_shm_cfgtbl.Intr.value = 0; /* signal to send? */
BSP_shm_cfgtbl.Intr.length = LONG;
#endif
*shmcfg = &BSP_shm_cfgtbl;
}
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