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mips_param.h revision 1.25 
      1 /*	$NetBSD: mips_param.h,v 1.25 2009/08/13 05:15:09 matt 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 #ifdef ENABLE_MIPS_16KB_PAGE
     16 #define	UPAGES		1		/* pages of u-area */
     17 #define	USPACE		(UPAGES*NBPG)	/* size of u-area in bytes */
     18 #elif defined(ENABLE_MIPS_4KB_PAGE) || 1
     19 #define	UPAGES		2		/* pages of u-area */
     20 #define	USPACE		(UPAGES*NBPG)	/* size of u-area in bytes */
     21 #else
     22 #error ENABLE_MIPS_xKB_PAGE not defined
     23 #endif
     24 
     25 #ifndef MSGBUFSIZE
     26 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     27 #endif
     28 
     29 /*
     30  * Round p (pointer or byte index) up to a correctly-aligned value for all
     31  * data types (int, long, ...).   The result is u_int and must be cast to
     32  * any desired pointer type.
     33  *
     34  * ALIGNED_POINTER is a boolean macro that checks whether an address
     35  * is valid to fetch data elements of type t from on this architecture.
     36  * This does not reflect the optimal alignment, just the possibility
     37  * (within reasonable limits).
     38  *
     39  */
     40 #define	ALIGNBYTES	7
     41 #define	ALIGN(p)	(((uintptr_t)(p) + ALIGNBYTES) & ~ALIGNBYTES)
     42 #define ALIGNED_POINTER(p,t)	((((uintptr_t)(p)) & (sizeof(t)-1)) == 0)
     43 
     44 #ifdef ENABLE_MIPS_16KB_PAGE
     45 #define	NBPG		16384		/* bytes/page */
     46 #define	PGSHIFT		14		/* LOG2(NBPG) */
     47 #else
     48 #define	NBPG		4096		/* bytes/page */
     49 #define	PGSHIFT		12		/* LOG2(NBPG) */
     50 #endif
     51 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     52 #define	NPTEPG		(NBPG/4)
     53 
     54 #define NBSEG		(NBPG*NPTEPG)	/* bytes/segment */
     55 #define	SEGOFSET	(NBSEG-1)	/* byte offset into segment */
     56 #define	SEGSHIFT	(2*PGSHIFT-2)	/* LOG2(NBSEG) */
     57 
     58 /*
     59  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
     60  * logical pages.
     61  */
     62 #define	NKMEMPAGES_MIN_DEFAULT	((8 * 1024 * 1024) >> PAGE_SHIFT)
     63 #define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
     64 
     65 /*
     66  * Mach derived conversion macros
     67  */
     68 #define mips_round_page(x)	((((uintptr_t)(x)) + NBPG - 1) & ~(NBPG-1))
     69 #define mips_trunc_page(x)	((uintptr_t)(x) & ~(NBPG-1))
     70 #define mips_btop(x)		((paddr_t)(x) >> PGSHIFT)
     71 #define mips_ptob(x)		((paddr_t)(x) << PGSHIFT)
     72 
     73 #ifdef __MIPSEL__
     74 #define	MID_MACHINE	135	/* MID_PMAX (little-endian) */
     75 #endif
     76 #ifdef __MIPSEB__
     77 #define	MID_MACHINE	152	/* MID_MIPS (big-endian) */
     78 #endif
     79 
     80