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mips_param.h revision 1.28 
      1 /*	$NetBSD: mips_param.h,v 1.28 2011/02/20 07:45:47 matt Exp $	*/
      2 
      3 #ifdef _KERNEL
      4 #include <machine/cpu.h>
      5 #endif
      6 
      7 /*
      8  * No reason this can't be common
      9  */
     10 #if defined(__MIPSEB__)
     11 # if defined(__mips_n32) || defined(__mips_n64)
     12 #  define	_MACHINE_ARCH	mips64eb
     13 #  define	MACHINE_ARCH	"mips64eb"
     14 #  define	_MACHINE32_ARCH	mipseb
     15 #  define	MACHINE32_ARCH	"mipseb"
     16 # else
     17 #  define	_MACHINE_ARCH	mipseb
     18 #  define	MACHINE_ARCH	"mipseb"
     19 # endif
     20 #elif defined(__MIPSEL__)
     21 # if defined(__mips_n32) || defined(__mips_n64)
     22 #  define	_MACHINE_ARCH	mips64el
     23 #  define	MACHINE_ARCH	"mips64el"
     24 #  define	_MACHINE32_ARCH	mipsel
     25 #  define	MACHINE32_ARCH	"mipsel"
     26 # else
     27 #  define	_MACHINE_ARCH	mipsel
     28 #  define	MACHINE_ARCH	"mipsel"
     29 #endif
     30 #else
     31 #error neither __MIPSEL__ nor __MIPSEB__ are defined.
     32 #endif
     33 
     34 /*
     35  * On mips, UPAGES is fixed by sys/arch/mips/mips/locore code
     36  * to be the number of per-process-wired kernel-stack pages/PTES.
     37  */
     38 
     39 #define	SSIZE		1		/* initial stack size/NBPG */
     40 #define	SINCR		1		/* increment of stack/NBPG */
     41 
     42 #ifdef ENABLE_MIPS_16KB_PAGE
     43 #define	UPAGES		1		/* pages of u-area */
     44 #define	USPACE		(UPAGES*NBPG)	/* size of u-area in bytes */
     45 #elif defined(ENABLE_MIPS_4KB_PAGE) || 1
     46 #define	UPAGES		2		/* pages of u-area */
     47 #define	USPACE		(UPAGES*NBPG)	/* size of u-area in bytes */
     48 #else
     49 #error ENABLE_MIPS_xKB_PAGE not defined
     50 #endif
     51 #define	USPACE_ALIGN	USPACE		/* make sure it starts on a even VA */
     52 
     53 #ifndef MSGBUFSIZE
     54 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     55 #endif
     56 
     57 #ifndef COHERENCY_UNIT
     58 #define COHERENCY_UNIT	32	/* MIPS cachelines are usually 32 bytes */
     59 #endif
     60 
     61 /*
     62  * Round p (pointer or byte index) up to a correctly-aligned value for all
     63  * data types (int, long, ...).   The result is u_int and must be cast to
     64  * any desired pointer type.
     65  *
     66  * ALIGNED_POINTER is a boolean macro that checks whether an address
     67  * is valid to fetch data elements of type t from on this architecture.
     68  * This does not reflect the optimal alignment, just the possibility
     69  * (within reasonable limits).
     70  *
     71  */
     72 #define	ALIGNBYTES	7
     73 #define	ALIGN(p)	(((uintptr_t)(p) + ALIGNBYTES) & ~ALIGNBYTES)
     74 #define ALIGNED_POINTER(p,t)	((((uintptr_t)(p)) & (sizeof(t)-1)) == 0)
     75 
     76 #ifdef ENABLE_MIPS_16KB_PAGE
     77 #define	NBPG		16384		/* bytes/page */
     78 #define	PGSHIFT		14		/* LOG2(NBPG) */
     79 #else
     80 #define	NBPG		4096		/* bytes/page */
     81 #define	PGSHIFT		12		/* LOG2(NBPG) */
     82 #endif
     83 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     84 #define	NPTEPG		(NBPG/4)
     85 
     86 #define NBSEG		(NBPG*NPTEPG)	/* bytes/segment */
     87 #define	SEGOFSET	(NBSEG-1)	/* byte offset into segment */
     88 #define	SEGSHIFT	(PGSHIFT+(PGSHIFT-2))	/* LOG2(NBSEG) */
     89 
     90 #ifdef _LP64
     91 #define	NSEGPG		(NBPG/8)
     92 #define NBXSEG		(NSEGPG*NBSEG)	/* bytes/xsegment */
     93 #define	XSEGOFSET	(NBSEG-1)	/* byte offset into segment */
     94 #define	XSEGSHIFT	(SEGSHIFT+(PGSHIFT-3))	/* LOG2(NBXSEG) */
     95 #endif
     96 
     97 /*
     98  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
     99  * logical pages.
    100  */
    101 #define	NKMEMPAGES_MIN_DEFAULT	((8 * 1024 * 1024) >> PAGE_SHIFT)
    102 #define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
    103 
    104 /*
    105  * Mach derived conversion macros
    106  */
    107 #define mips_round_page(x)	((((uintptr_t)(x)) + NBPG - 1) & ~(NBPG-1))
    108 #define mips_trunc_page(x)	((uintptr_t)(x) & ~(NBPG-1))
    109 #define mips_btop(x)		((paddr_t)(x) >> PGSHIFT)
    110 #define mips_ptob(x)		((paddr_t)(x) << PGSHIFT)
    111 
    112 #ifdef __MIPSEL__
    113 #define	MID_MACHINE	MID_PMAX	/* MID_PMAX (little-endian) */
    114 #endif
    115 #ifdef __MIPSEB__
    116 #define	MID_MACHINE	MID_MIPS	/* MID_MIPS (big-endian) */
    117 #endif
    118 
    119 /*
    120  * Constants related to network buffer management.
    121  * MCLBYTES must be no larger than NBPG (the software page size), and,
    122  * on machines that exchange pages of input or output buffers with mbuf
    123  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
    124  * of the hardware page size.
    125  */
    126 #ifndef MSIZE
    127 #ifdef _LP64
    128 #define	MSIZE		512		/* size of an mbuf */
    129 #else
    130 #define	MSIZE		256		/* size of an mbuf */
    131 #endif
    132 
    133 #ifndef MCLSHIFT
    134 # define MCLSHIFT	11		/* convert bytes to m_buf clusters */
    135 #endif	/* MCLSHIFT */
    136 
    137 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    138 
    139 #endif
    140