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mips_param.h revision 1.14.8.1 
      1 /*	$NetBSD: mips_param.h,v 1.14.8.1 1999/12/27 18:32:45 wrstuden Exp $	*/
      2 
      3 /*
      4  * On mips, UPAGES is fixed by sys/arch/mips/mips/locore code
      5  * to be the number of per-process-wired kernel-stack pages/PTES.
      6  */
      7 
      8 #define	SSIZE		1		/* initial stack size/NBPG */
      9 #define	SINCR		1		/* increment of stack/NBPG */
     10 
     11 #define	UPAGES		2		/* pages of u-area */
     12 #define USPACE          (UPAGES*NBPG)   /* size of u-area in bytes */
     13 
     14 #ifndef MSGBUFSIZE
     15 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     16 #endif
     17 
     18 /*
     19  * Round p (pointer or byte index) up to a correctly-aligned value for all
     20  * data types (int, long, ...).   The result is u_int and must be cast to
     21  * any desired pointer type.
     22  *
     23  * ALIGNED_POINTER is a boolean macro that checks whether an address
     24  * is valid to fetch data elements of type t from on this architecture.
     25  * This does not reflect the optimal alignment, just the possibility
     26  * (within reasonable limits).
     27  *
     28  */
     29 #define	ALIGNBYTES	7
     30 #define	ALIGN(p)	(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
     31 #define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     32 
     33 #ifdef MIPS_16K_PAGE			/* enable kernel support for 16k pages  */
     34 #define	NBPG		(1024*16)	/* bytes/page */
     35 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     36 #define	PGSHIFT		14		/* LOG2(NBPG) */
     37 #else
     38 #define	NBPG		4096		/* bytes/page */
     39 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     40 #define	PGSHIFT		12		/* LOG2(NBPG) */
     41 #endif
     42 #define	NPTEPG		(NBPG/4)
     43 
     44 #define NBSEG		0x400000	/* bytes/segment */
     45 #define	SEGOFSET	(NBSEG-1)	/* byte offset into segment */
     46 #define	SEGSHIFT	22		/* LOG2(NBSEG) */
     47 
     48 /*
     49  * Size of kernel malloc arena in NBPG-sized logical pages
     50  */
     51 #ifndef NKMEMCLUSTERS
     52 #define	NKMEMCLUSTERS	(6 * 1024 * 1024 / NBPG)
     53 #endif
     54 
     55 /* pages ("clicks") (4096 bytes) to disk blocks */
     56 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
     57 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
     58 
     59 /* pages to bytes */
     60 #define	ctob(x)		((x) << PGSHIFT)
     61 #define btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
     62 
     63 /* bytes to disk blocks */
     64 #define	btodb(x)	((x) >> DEV_BSHIFT)
     65 #define dbtob(x)	((x) << DEV_BSHIFT)
     66 
     67 /*
     68  * Map a ``block device block'' to a file system block.
     69  * This should be device dependent, and should use the bsize
     70  * field from the disk label.
     71  * For now though just use DEV_BSIZE.
     72  */
     73 #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
     74 
     75 /*
     76  * Mach derived conversion macros
     77  */
     78 #define mips_round_page(x)	((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
     79 #define mips_trunc_page(x)	((unsigned)(x) & ~(NBPG-1))
     80 #define mips_btop(x)		((unsigned)(x) >> PGSHIFT)
     81 #define mips_ptob(x)		((unsigned)(x) << PGSHIFT)
     82