text: /*
   * Copyright (c) 1992, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This software was developed by the Computer Systems Engineering group
   * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   * contributed to Berkeley.
   *
   * All advertising materials mentioning features or use of this software
   * must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Lawrence Berkeley Laboratory.
   *
   * %sccs.include.redist.c%
   *
   *	@(#)param.h	8.3 (Berkeley) 05/14/95
   *
   * from: $Header: param.h,v 1.13 92/11/26 02:04:38 torek Exp $ (LBL)
   */
  
  /*
   * Machine dependent constants for Sun-4c (SPARCstation)
   */
  #define	MACHINE	"sparc"
  #define NCPUS 1
  
  #ifdef KERNEL				/* XXX */
  #include <machine/cpu.h>		/* XXX */
  #endif					/* XXX */
  
  /*
   * Round p (pointer or byte index) up to a correctly-aligned value for
   * the machine's strictest data type.  The result is u_int and must be
   * cast to any desired pointer type.
   */
  #define	ALIGNBYTES	7
  #define	ALIGN(p)	(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
  
  #define	NBPG		4096		/* bytes/page */
  #define	PGOFSET		(NBPG-1)	/* byte offset into page */
  #define	PGSHIFT		12		/* log2(NBPG) */
  
  #define	KERNBASE	0xf8000000	/* start of kernel virtual space */
  #define	KERNTEXTOFF	0xf8004000	/* start of kernel text */
  #define	BTOPKERNBASE	((u_long)KERNBASE >> PG_SHIFT)
  
  #define	DEV_BSIZE	512
  #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
  #define	BLKDEV_IOSIZE	2048
  #define	MAXPHYS		(64 * 1024)
  
  #define	CLSIZE		1
  #define	CLSIZELOG2	0
  
  /* NOTE: SSIZE and UPAGES must be multiples of CLSIZE */
  #define	SSIZE		1		/* initial stack size/NBPG */
  #define	UPAGES		2		/* pages of u-area */
  
  /*
   * Constants related to network buffer management.
   * MCLBYTES must be no larger than CLBYTES (the software page size), and,
   * on machines that exchange pages of input or output buffers with mbuf
   * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
   * of the hardware page size.
   */
  #define	MSIZE		128		/* size of an mbuf */
  #define	MCLBYTES	2048		/* enough for whole Ethernet packet */
  #define	MCLSHIFT	11		/* log2(MCLBYTES) */
  #define	MCLOFSET	(MCLBYTES - 1)
  
  #ifndef NMBCLUSTERS
  #ifdef GATEWAY
  #define	NMBCLUSTERS	512		/* map size, max cluster allocation */
  #else
  #define	NMBCLUSTERS	256		/* map size, max cluster allocation */
  #endif
  #endif
  
  /*
   * Size of kernel malloc arena in CLBYTES-sized logical pages.
   */
  #ifndef	NKMEMCLUSTERS
  #define	NKMEMCLUSTERS	(6 * 1024 * 1024 / CLBYTES)
  #endif
  
  /* pages ("clicks") (4096 bytes) to disk blocks */
  #define	ctod(x)	((x) << (PGSHIFT - DEV_BSHIFT))
  #define	dtoc(x)	((x) >> (PGSHIFT - DEV_BSHIFT))
  #define	dtob(x)	((x) << DEV_BSHIFT)
  
  /* pages to bytes */
  #define	ctob(x)	((x) << PGSHIFT)
  
  /* bytes to pages */
  #define	btoc(x)	(((unsigned)(x) + PGOFSET) >> PGSHIFT)
  
  #define	btodb(bytes)		/* calculates (bytes / DEV_BSIZE) */ \
  	((bytes) >> DEV_BSHIFT)
  #define	dbtob(db)		/* calculates (db * DEV_BSIZE) */ \
  	((db) << DEV_BSHIFT)
  
  /*
   * Map a ``block device block'' to a file system block.
   * This should be device dependent, and should use the bsize
   * field from the disk label.
   * For now though just use DEV_BSIZE.
   */
  #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))
  
  #ifdef KERNEL
  #ifndef LOCORE
  #define	DELAY(n)	delay(n)
  #endif
  #else
  #define	DELAY(n)	{ register volatile int N = (n); while (--N > 0); }
  #endif
  
  #ifndef _SIMPLELOCK_H_
  #define _SIMPLELOCK_H_
  /*
   * A simple spin lock.
   *
   * This structure only sets one bit of data, but is sized based on the
   * minimum word size that can be operated on by the hardware test-and-set
   * instruction. It is only needed for multiprocessors, as uniprocessors
   * will always run to completion or a sleep. It is an error to hold one
   * of these locks while a process is sleeping.
   */
  struct simplelock {
  	int	lock_data;
  };
  
  #if !defined(DEBUG) && NCPUS > 1
  /*
   * The simple-lock routines are the primitives out of which the lock
   * package is built. The machine-dependent code must implement an
   * atomic test_and_set operation that indivisibly sets the simple lock
   * to non-zero and returns its old value. It also assumes that the
   * setting of the lock to zero below is indivisible. Simple locks may
   * only be used for exclusive locks.
   */
  static __inline void
  simple_lock_init(lkp)
  	struct simplelock *lkp;
  {
  
  	lkp->lock_data = 0;
  }
  
  static __inline void
  simple_lock(lkp)
  	__volatile struct simplelock *lkp;
  {
  
  	while (test_and_set(&lkp->lock_data))
  		continue;
  }
  
  static __inline int
  simple_lock_try(lkp)
  	__volatile struct simplelock *lkp;
  {
  
  	return (!test_and_set(&lkp->lock_data))
  }
  
  static __inline void
  simple_unlock(lkp)
  	__volatile struct simplelock *lkp;
  {
  
  	lkp->lock_data = 0;
  }
  #endif /* NCPUS > 1 */
  #endif /* !_SIMPLELOCK_H_ */
  