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mips_param.h revision 1.21 
      1 /*	$NetBSD: mips_param.h,v 1.21 2000/12/11 15:38:43 tsutsui Exp $	*/
      2 
      3 #ifdef _KERNEL
      4 #include <machine/cpu.h>
      5 #endif
      6 
      7 /*
      8  * On mips, UPAGES is fixed by sys/arch/mips/mips/locore code
      9  * to be the number of per-process-wired kernel-stack pages/PTES.
     10  */
     11 
     12 #define	SSIZE		1		/* initial stack size/NBPG */
     13 #define	SINCR		1		/* increment of stack/NBPG */
     14 
     15 #define	UPAGES		2		/* pages of u-area */
     16 #define	USPACE		(UPAGES*NBPG)	/* size of u-area in bytes */
     17 
     18 #ifndef MSGBUFSIZE
     19 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     20 #endif
     21 
     22 /*
     23  * Round p (pointer or byte index) up to a correctly-aligned value for all
     24  * data types (int, long, ...).   The result is u_int and must be cast to
     25  * any desired pointer type.
     26  *
     27  * ALIGNED_POINTER is a boolean macro that checks whether an address
     28  * is valid to fetch data elements of type t from on this architecture.
     29  * This does not reflect the optimal alignment, just the possibility
     30  * (within reasonable limits).
     31  *
     32  */
     33 #define	ALIGNBYTES	7
     34 #define	ALIGN(p)	(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
     35 #define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     36 
     37 #define	NBPG		4096		/* bytes/page */
     38 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     39 #define	PGSHIFT		12		/* LOG2(NBPG) */
     40 #define	NPTEPG		(NBPG/4)
     41 
     42 #define NBSEG		0x400000	/* bytes/segment */
     43 #define	SEGOFSET	(NBSEG-1)	/* byte offset into segment */
     44 #define	SEGSHIFT	22		/* LOG2(NBSEG) */
     45 
     46 /*
     47  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
     48  * logical pages.
     49  */
     50 #define	NKMEMPAGES_MIN_DEFAULT	((8 * 1024 * 1024) >> PAGE_SHIFT)
     51 #define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
     52 
     53 /* pages ("clicks") (4096 bytes) to disk blocks */
     54 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
     55 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
     56 
     57 /* pages to bytes */
     58 #define	ctob(x)		((x) << PGSHIFT)
     59 #define btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
     60 
     61 /* bytes to disk blocks */
     62 #define	btodb(x)	((x) >> DEV_BSHIFT)
     63 #define dbtob(x)	((x) << DEV_BSHIFT)
     64 
     65 /*
     66  * Map a ``block device block'' to a file system block.
     67  * This should be device dependent, and should use the bsize
     68  * field from the disk label.
     69  * For now though just use DEV_BSIZE.
     70  */
     71 #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
     72 
     73 /*
     74  * Mach derived conversion macros
     75  */
     76 #define mips_round_page(x)	((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
     77 #define mips_trunc_page(x)	((unsigned)(x) & ~(NBPG-1))
     78 #define mips_btop(x)		((paddr_t)(x) >> PGSHIFT)
     79 #define mips_ptob(x)		((paddr_t)(x) << PGSHIFT)
     80