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mips_param.h revision 1.51 
      1 /*	$NetBSD: mips_param.h,v 1.51 2021/05/31 14:38:56 simonb Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifdef _KERNEL_OPT
     30 #include "opt_param.h"
     31 #endif
     32 
     33 /*
     34  * No reason this can't be common
     35  */
     36 #if defined(__MIPSEB__)
     37 # define _MACHINE_SUFFIX eb
     38 # define MACHINE_SUFFIX "eb"
     39 #elif defined(__MIPSEL__)
     40 # define _MACHINE_SUFFIX el
     41 # define MACHINE_SUFFIX "el"
     42 #else
     43 # error neither __MIPSEL__ nor __MIPSEB__ are defined.
     44 #endif
     45 
     46 #define	___MACHINE32_OARCH		mips##_MACHINE_SUFFIX
     47 #define	__MACHINE32_OARCH		"mips" MACHINE_SUFFIX
     48 #define	___MACHINE32_NARCH		mips64##_MACHINE_SUFFIX
     49 #define	__MACHINE32_NARCH		"mips64" MACHINE_SUFFIX
     50 #define	___MACHINE64_NARCH		mipsn64##_MACHINE_SUFFIX
     51 #define	__MACHINE64_NARCH		"mipsn64" MACHINE_SUFFIX
     52 
     53 #if defined(__mips_n32) || defined(__mips_n64)
     54 # if defined(__mips_n32)
     55 #  define	_MACHINE_ARCH		___MACHINE32_NARCH
     56 #  define	MACHINE_ARCH		__MACHINE32_NARCH
     57 # else /* __mips_n64 */
     58 #  define	_MACHINE_ARCH		___MACHINE64_NARCH
     59 #  define	MACHINE_ARCH		__MACHINE64_NARCH
     60 #  define	_MACHINE32_NARCH	___MACHINE32_NARCH
     61 #  define	MACHINE32_NARCH		__MACHINE32_NARCH
     62 # endif
     63 # define	_MACHINE32_OARCH	___MACHINE32_OARCH
     64 # define	MACHINE32_OARCH		__MACHINE32_OARCH
     65 #else /* o32 */
     66 # define	_MACHINE_ARCH		___MACHINE32_OARCH
     67 # define	MACHINE_ARCH		__MACHINE32_OARCH
     68 #endif
     69 
     70 /*
     71  * Userland code should be using uname/sysctl to get MACHINE so simply
     72  * export a generic MACHINE of "mips"
     73  */
     74 #ifndef _KERNEL
     75 #undef MACHINE
     76 #define	MACHINE "mips"
     77 #endif
     78 
     79 #define	ALIGNBYTES32		(sizeof(double) - 1)
     80 #define	ALIGN32(p)		(((uintptr_t)(p) + ALIGNBYTES32) &~ALIGNBYTES32)
     81 
     82 /*
     83  * On mips, UPAGES is fixed by sys/arch/mips/mips/locore code
     84  * to be the number of per-process-wired kernel-stack pages/PTES.
     85  */
     86 
     87 #define	SSIZE		1		/* initial stack size/NBPG */
     88 #define	SINCR		1		/* increment of stack/NBPG */
     89 
     90 #if (ENABLE_MIPS_16KB_PAGE + ENABLE_MIPS_8KB_PAGE + ENABLE_MIPS_4KB_PAGE) > 1
     91 #error only one of ENABLE_MIPS_{4,8,16}KB_PAGE can be defined.
     92 #endif
     93 
     94 #ifndef MSGBUFSIZE
     95 #define	MSGBUFSIZE	NBPG		/* default message buffer size */
     96 #endif
     97 
     98 /*
     99  * Most MIPS have a cache line size of 32 bytes, but Cavium chips
    100  * have a line size 128 bytes and we need to cover the larger size.
    101  */
    102 #define	COHERENCY_UNIT	128
    103 #define	CACHE_LINE_SIZE	128
    104 
    105 #ifdef ENABLE_MIPS_16KB_PAGE
    106 #define	PGSHIFT		14		/* LOG2(NBPG) */
    107 #elif defined(ENABLE_MIPS_8KB_PAGE) \
    108     || (!defined(ENABLE_MIPS_4KB_PAGE) && __mips >= 3)
    109 #define	PGSHIFT		13		/* LOG2(NBPG) */
    110 #else
    111 #define	PGSHIFT		12		/* LOG2(NBPG) */
    112 #endif
    113 #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
    114 #define	PGOFSET		(NBPG - 1)	/* byte offset into page */
    115 #define	PTPSHIFT	2
    116 #define	PTPLENGTH	(PGSHIFT - PTPSHIFT)
    117 #define	NPTEPG		(1 << PTPLENGTH)
    118 
    119 #define	SEGSHIFT	(PGSHIFT + PTPLENGTH)	/* LOG2(NBSEG) */
    120 #define	NBSEG		(1 << SEGSHIFT)	/* bytes/segment */
    121 #define	SEGOFSET	(NBSEG - 1)	/* byte offset into segment */
    122 
    123 #ifdef _LP64
    124 #define	SEGLENGTH	(PGSHIFT - 3)
    125 #define	XSEGSHIFT	(SEGSHIFT + SEGLENGTH)	/* LOG2(NBXSEG) */
    126 #define	NBXSEG		(1UL << XSEGSHIFT)	/* bytes/xsegment */
    127 #define	XSEGOFSET	(NBXSEG - 1)	/* byte offset into xsegment */
    128 #define	XSEGLENGTH	(PGSHIFT - 3)
    129 #define	NXSEGPG		(1 << XSEGLENGTH)
    130 #else
    131 #define	SEGLENGTH	(31 - SEGSHIFT)
    132 #endif
    133 #define	NSEGPG		(1 << SEGLENGTH)
    134 
    135 #ifdef _LP64
    136 #define	__MIN_USPACE	16384		/* LP64 needs a 16kB stack */
    137 #else
    138 /*
    139  * Note for the non-LP64 case, cpu_switch_resume has the assumption
    140  * that UPAGES == 2.  For MIPS-I we wire USPACE in TLB #0 and #1.
    141  * For MIPS3+ we wire USPACE in the the TLB #0 pair.
    142  */
    143 #define	__MIN_USPACE	8192		/* otherwise use an 8kB stack */
    144 #endif
    145 #define	USPACE		MAX(__MIN_USPACE, PAGE_SIZE)
    146 #define	UPAGES		(USPACE / PAGE_SIZE) /* number of pages for u-area */
    147 #define	USPACE_ALIGN	USPACE		/* make sure it starts on a even VA */
    148 #define	UPAGES_MAX	8		/* a (constant) max for userland use */
    149 
    150 /*
    151  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
    152  * logical pages.
    153  */
    154 #define	NKMEMPAGES_MIN_DEFAULT	((8 * 1024 * 1024) >> PAGE_SHIFT)
    155 #define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
    156 
    157 /*
    158  * Mach derived conversion macros
    159  */
    160 #define	mips_round_page(x)	((((uintptr_t)(x)) + NBPG - 1) & ~(NBPG-1))
    161 #define	mips_trunc_page(x)	((uintptr_t)(x) & ~(NBPG-1))
    162 #define	mips_btop(x)		((paddr_t)(x) >> PGSHIFT)
    163 #define	mips_ptob(x)		((paddr_t)(x) << PGSHIFT)
    164 
    165 #ifdef __MIPSEL__
    166 #define	MID_MACHINE	MID_PMAX	/* MID_PMAX (little-endian) */
    167 #endif
    168 #ifdef __MIPSEB__
    169 #define	MID_MACHINE	MID_MIPS	/* MID_MIPS (big-endian) */
    170 #endif
    171 
    172 /*
    173  * Constants related to network buffer management.
    174  * MCLBYTES must be no larger than NBPG (the software page size), and,
    175  * on machines that exchange pages of input or output buffers with mbuf
    176  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
    177  * of the hardware page size.
    178  */
    179 #ifndef MSIZE
    180 #ifdef _LP64
    181 #define	MSIZE		512		/* size of an mbuf */
    182 #else
    183 #define	MSIZE		256		/* size of an mbuf */
    184 #endif
    185 
    186 #ifndef MCLSHIFT
    187 # define MCLSHIFT	11		/* convert bytes to m_buf clusters */
    188 #endif	/* MCLSHIFT */
    189 
    190 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    191 
    192 #endif
    193