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mips_param.h revision 1.10 
      1 /*	$NetBSD: mips_param.h,v 1.10 1998/09/11 16:46:31 jonathan Exp $	*/
      2 
      3 /*
      4  * Architecture name.
      5  */
      6 #define	_MACHINE_ARCH	mips
      7 #define	MACHINE_ARCH	"mips"
      8 
      9 /*
     10  * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE.
     11  * On mips, UPAGES is fixed by sys/arch/mips/mips/locore code
     12  * to be the number of per-process-wired kernel-stack pages/PTES.
     13  */
     14 
     15 #define	SSIZE		1		/* initial stack size/NBPG */
     16 #define	SINCR		1		/* increment of stack/NBPG */
     17 
     18 #define	UPAGES		2		/* pages of u-area */
     19 #define	UADDR		0xffffc000	/* address of u */
     20 #define USPACE          (UPAGES*NBPG)   /* size of u-area in bytes */
     21 #define	UVPN		(UADDR>>PGSHIFT)/* virtual page number of u */
     22 #define	KERNELSTACK	(UADDR+UPAGES*NBPG)	/* top of kernel stack */
     23 
     24 #ifndef MSGBUFSIZE
     25 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     26 #endif
     27 
     28 /*
     29  * Round p (pointer or byte index) up to a correctly-aligned value for all
     30  * data types (int, long, ...).   The result is u_int and must be cast to
     31  * any desired pointer type.
     32  *
     33  * ALIGNED_POINTER is a boolean macro that checks whether an address
     34  * is valid to fetch data elements of type t from on this architecture.
     35  * This does not reflect the optimal alignment, just the possibility
     36  * (within reasonable limits).
     37  *
     38  */
     39 #define	ALIGNBYTES	7
     40 #define	ALIGN(p)	(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
     41 #define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     42 
     43 #define	NBPG		4096		/* bytes/page */
     44 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     45 #define	PGSHIFT		12		/* LOG2(NBPG) */
     46 #define	NPTEPG		(NBPG/4)
     47 
     48 #define NBSEG		0x400000	/* bytes/segment */
     49 #define	SEGOFSET	(NBSEG-1)	/* byte offset into segment */
     50 #define	SEGSHIFT	22		/* LOG2(NBSEG) */
     51 
     52 /*
     53  * Size of kernel malloc arena in CLBYTES-sized logical pages
     54  */
     55 #ifndef NKMEMCLUSTERS
     56 #define	NKMEMCLUSTERS	(6 * 1024 * 1024 / CLBYTES)
     57 #endif
     58 
     59 /* pages ("clicks") (4096 bytes) to disk blocks */
     60 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
     61 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
     62 
     63 /* pages to bytes */
     64 #define	ctob(x)		((x) << PGSHIFT)
     65 #define btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
     66 
     67 /* bytes to disk blocks */
     68 #define	btodb(x)	((x) >> DEV_BSHIFT)
     69 #define dbtob(x)	((x) << DEV_BSHIFT)
     70 
     71 /*
     72  * Map a ``block device block'' to a file system block.
     73  * This should be device dependent, and should use the bsize
     74  * field from the disk label.
     75  * For now though just use DEV_BSIZE.
     76  */
     77 #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
     78 
     79 /*
     80  * Mach derived conversion macros
     81  */
     82 #define mips_round_page(x)	((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
     83 #define mips_trunc_page(x)	((unsigned)(x) & ~(NBPG-1))
     84 #define mips_btop(x)		((unsigned)(x) >> PGSHIFT)
     85 #define mips_ptob(x)		((unsigned)(x) << PGSHIFT)
     86