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mips_param.h revision 1.17 
      1 /*	$NetBSD: mips_param.h,v 1.17 2000/02/11 19:25:16 thorpej Exp $	*/
      2 
      3 #include <machine/cpu.h>
      4 
      5 /*
      6  * On mips, UPAGES is fixed by sys/arch/mips/mips/locore code
      7  * to be the number of per-process-wired kernel-stack pages/PTES.
      8  */
      9 
     10 #define	SSIZE		1		/* initial stack size/NBPG */
     11 #define	SINCR		1		/* increment of stack/NBPG */
     12 
     13 #define	UPAGES		2		/* pages of u-area */
     14 #define USPACE          (UPAGES*NBPG)   /* size of u-area in bytes */
     15 
     16 #ifndef MSGBUFSIZE
     17 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     18 #endif
     19 
     20 /*
     21  * Round p (pointer or byte index) up to a correctly-aligned value for all
     22  * data types (int, long, ...).   The result is u_int and must be cast to
     23  * any desired pointer type.
     24  *
     25  * ALIGNED_POINTER is a boolean macro that checks whether an address
     26  * is valid to fetch data elements of type t from on this architecture.
     27  * This does not reflect the optimal alignment, just the possibility
     28  * (within reasonable limits).
     29  *
     30  */
     31 #define	ALIGNBYTES	7
     32 #define	ALIGN(p)	(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
     33 #define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     34 
     35 #ifdef MIPS_16K_PAGE			/* enable kernel support for 16k pages  */
     36 #define	NBPG		(1024*16)	/* bytes/page */
     37 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     38 #define	PGSHIFT		14		/* LOG2(NBPG) */
     39 #else
     40 #define	NBPG		4096		/* bytes/page */
     41 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     42 #define	PGSHIFT		12		/* LOG2(NBPG) */
     43 #endif
     44 #define	NPTEPG		(NBPG/4)
     45 
     46 #define NBSEG		0x400000	/* bytes/segment */
     47 #define	SEGOFSET	(NBSEG-1)	/* byte offset into segment */
     48 #define	SEGSHIFT	22		/* LOG2(NBSEG) */
     49 
     50 /*
     51  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
     52  * logical pages.
     53  */
     54 #define	NKMEMPAGES_MIN_DEFAULT	((8 * 1024 * 1024) >> PAGE_SHIFT)
     55 #define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
     56 
     57 /* pages ("clicks") (4096 bytes) to disk blocks */
     58 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
     59 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
     60 
     61 /* pages to bytes */
     62 #define	ctob(x)		((x) << PGSHIFT)
     63 #define btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
     64 
     65 /* bytes to disk blocks */
     66 #define	btodb(x)	((x) >> DEV_BSHIFT)
     67 #define dbtob(x)	((x) << DEV_BSHIFT)
     68 
     69 /*
     70  * Map a ``block device block'' to a file system block.
     71  * This should be device dependent, and should use the bsize
     72  * field from the disk label.
     73  * For now though just use DEV_BSIZE.
     74  */
     75 #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
     76 
     77 /*
     78  * Mach derived conversion macros
     79  */
     80 #define mips_round_page(x)	((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
     81 #define mips_trunc_page(x)	((unsigned)(x) & ~(NBPG-1))
     82 #define mips_btop(x)		((unsigned)(x) >> PGSHIFT)
     83 #define mips_ptob(x)		((unsigned)(x) << PGSHIFT)
     84