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Annotation of Net2/arch/amiga/include/vmparam.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 University of Utah.
        !             3:  * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * the Systems Programming Group of the University of Utah Computer
        !             8:  * Science Department.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  * from: Utah $Hdr: vmparam.h 1.16 91/01/18$
        !            39:  *
        !            40:  *     @(#)vmparam.h   7.3 (Berkeley) 5/7/91
        !            41:  */
        !            42: 
        !            43: /*
        !            44:  * Machine dependent constants for HP300
        !            45:  */
        !            46: /*
        !            47:  * USRTEXT is the start of the user text/data space, while USRSTACK
        !            48:  * is the top (end) of the user stack.  LOWPAGES and HIGHPAGES are
        !            49:  * the number of pages from the beginning of the P0 region to the
        !            50:  * beginning of the text and from the beginning of the P1 region to the
        !            51:  * beginning of the stack respectively.
        !            52:  *
        !            53:  * These are a mixture of i386, sun3 and hp settings.. 
        !            54:  */
        !            55: 
        !            56: /* Sun settings. Still hope, that I might get sun3 binaries to work... */
        !            57: #define        USRTEXT         0x2000
        !            58: #define        USRSTACK        0x0F000000
        !            59: #define        LOWPAGES        btoc(USRTEXT)
        !            60: #define        HIGHPAGES       0
        !            61: 
        !            62: /*
        !            63:  * Virtual memory related constants, all in bytes
        !            64:  */
        !            65: 
        !            66: #if 0
        !            67: /* these are the sun3 parameters, but they obviously confuse our memory
        !            68:    allocator (because data and stack segments overlap). So for now,
        !            69:    limit both data and stack to 32M each, this should be fairly enough
        !            70:    for the start, and if not, we'll take another look at how to tell
        !            71:    the vm-system that it's ok if stack and data potentially overlap,
        !            72:    as long as they don't in reality.. */
        !            73: 
        !            74: #ifndef MAXTSIZ
        !            75: #define        MAXTSIZ         (6*1024*1024)           /* max text size */
        !            76: #endif
        !            77: #ifndef DFLDSIZ
        !            78: #define        DFLDSIZ         USRSTACK                /* initial data size limit */
        !            79: #endif
        !            80: #ifndef MAXDSIZ
        !            81: #define        MAXDSIZ         USRSTACK                /* max data size */
        !            82: #endif
        !            83: #ifndef        DFLSSIZ
        !            84: #define        DFLSSIZ         (2*1024*1024)           /* initial stack size limit */
        !            85: #endif
        !            86: #ifndef        MAXSSIZ
        !            87: #define        MAXSSIZ         MAXDSIZ                 /* max stack size */
        !            88: #endif
        !            89: 
        !            90: #else
        !            91: 
        !            92: #ifndef MAXTSIZ
        !            93: #define        MAXTSIZ         (6*1024*1024)           /* max text size */
        !            94: #endif
        !            95: #ifndef DFLDSIZ
        !            96: #define        DFLDSIZ         (32*1024*1024)          /* initial data size limit */
        !            97: #endif
        !            98: #ifndef MAXDSIZ
        !            99: #define        MAXDSIZ         (32*1024*1024)          /* max data size */
        !           100: #endif
        !           101: #ifndef        DFLSSIZ
        !           102: #define        DFLSSIZ         (2*1024*1024)           /* initial stack size limit */
        !           103: #endif
        !           104: #ifndef        MAXSSIZ
        !           105: #define        MAXSSIZ         MAXDSIZ                 /* max stack size */
        !           106: #endif
        !           107: 
        !           108: #endif
        !           109: 
        !           110: /*
        !           111:  * Default sizes of swap allocation chunks (see dmap.h).
        !           112:  * The actual values may be changed in vminit() based on MAXDSIZ.
        !           113:  * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
        !           114:  * DMMIN should be at least ctod(1) so that vtod() works.
        !           115:  * vminit() insures this.
        !           116:  */
        !           117: #define        DMMIN   32                      /* smallest swap allocation */
        !           118: #define        DMMAX   NBPG                    /* largest potential swap allocation */
        !           119: 
        !           120: /*
        !           121:  * Sizes of the system and user portions of the system page table.
        !           122:  */
        !           123: /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
        !           124: #define        SYSPTSIZE       (1 * NPTEPG)    /* 16mb */
        !           125: #define        USRPTSIZE       (1 * NPTEPG)    /* 16mb */
        !           126: 
        !           127: /*
        !           128:  * PTEs for mapping user space into the kernel for phyio operations.
        !           129:  * One page is enough to handle 16Mb of simultaneous raw IO operations.
        !           130:  */
        !           131: #ifndef USRIOSIZE
        !           132: #define USRIOSIZE      (1 * NPTEPG)    /* 16mb */
        !           133: #endif
        !           134: 
        !           135: /*
        !           136:  * PTEs for system V style shared memory.
        !           137:  * This is basically slop for kmempt which we actually allocate (malloc) from.
        !           138:  */
        !           139: #ifndef SHMMAXPGS
        !           140: #define SHMMAXPGS      (1 * NPTEPG)    /* 16mb */
        !           141: #endif
        !           142: 
        !           143: /*
        !           144:  * Boundary at which to place first MAPMEM segment if not explicitly
        !           145:  * specified.  Should be a power of two.  This allows some slop for
        !           146:  * the data segment to grow underneath the first mapped segment.
        !           147:  */
        !           148: /* XXXX probably too low !?!? */
        !           149: #define MMSEG          0x200000
        !           150: 
        !           151: /*
        !           152:  * The size of the clock loop.
        !           153:  */
        !           154: #define        LOOPPAGES       (maxfree - firstfree)
        !           155: 
        !           156: /*
        !           157:  * The time for a process to be blocked before being very swappable.
        !           158:  * This is a number of seconds which the system takes as being a non-trivial
        !           159:  * amount of real time.  You probably shouldn't change this;
        !           160:  * it is used in subtle ways (fractions and multiples of it are, that is, like
        !           161:  * half of a ``long time'', almost a long time, etc.)
        !           162:  * It is related to human patience and other factors which don't really
        !           163:  * change over time.
        !           164:  */
        !           165: #define        MAXSLP          20
        !           166: 
        !           167: /*
        !           168:  * A swapped in process is given a small amount of core without being bothered
        !           169:  * by the page replacement algorithm.  Basically this says that if you are
        !           170:  * swapped in you deserve some resources.  We protect the last SAFERSS
        !           171:  * pages against paging and will just swap you out rather than paging you.
        !           172:  * Note that each process has at least UPAGES+CLSIZE pages which are not
        !           173:  * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
        !           174:  * number just means a swapped in process is given around 25k bytes.
        !           175:  * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
        !           176:  * so we loan each swapped in process memory worth 100$, or just admit
        !           177:  * that we don't consider it worthwhile and swap it out to disk which costs
        !           178:  * $30/mb or about $0.75.
        !           179:  */
        !           180: #define        SAFERSS         4               /* nominal ``small'' resident set size
        !           181:                                           protected against replacement */
        !           182: 
        !           183: /*
        !           184:  * DISKRPM is used to estimate the number of paging i/o operations
        !           185:  * which one can expect from a single disk controller.
        !           186:  */
        !           187: #define        DISKRPM         60
        !           188: 
        !           189: /*
        !           190:  * Klustering constants.  Klustering is the gathering
        !           191:  * of pages together for pagein/pageout, while clustering
        !           192:  * is the treatment of hardware page size as though it were
        !           193:  * larger than it really is.
        !           194:  *
        !           195:  * KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
        !           196:  * units.  Note that ctod(KLMAX*CLSIZE) must be <= DMMIN in dmap.h.
        !           197:  * ctob(KLMAX) should also be less than MAXPHYS (in vm_swp.c)
        !           198:  * unless you like "big push" panics.
        !           199:  */
        !           200: 
        !           201: #define        KLMAX   (4/CLSIZE)
        !           202: #define        KLSEQL  (2/CLSIZE)              /* in klust if vadvise(VA_SEQL) */
        !           203: #define        KLIN    (4/CLSIZE)              /* default data/stack in klust */
        !           204: #define        KLTXT   (4/CLSIZE)              /* default text in klust */
        !           205: #define        KLOUT   (4/CLSIZE)
        !           206: 
        !           207: /*
        !           208:  * KLSDIST is the advance or retard of the fifo reclaim for sequential
        !           209:  * processes data space.
        !           210:  */
        !           211: #define        KLSDIST 3               /* klusters advance/retard for seq. fifo */
        !           212: 
        !           213: /*
        !           214:  * Paging thresholds (see vm_sched.c).
        !           215:  * Strategy of 1/19/85:
        !           216:  *     lotsfree is 512k bytes, but at most 1/4 of memory
        !           217:  *     desfree is 200k bytes, but at most 1/8 of memory
        !           218:  *     minfree is 64k bytes, but at most 1/2 of desfree
        !           219:  */
        !           220: #define        LOTSFREE        (512 * 1024)
        !           221: #define        LOTSFREEFRACT   4
        !           222: #define        DESFREE         (200 * 1024)
        !           223: #define        DESFREEFRACT    8
        !           224: #define        MINFREE         (64 * 1024)
        !           225: #define        MINFREEFRACT    2
        !           226: 
        !           227: /*
        !           228:  * There are two clock hands, initially separated by HANDSPREAD bytes
        !           229:  * (but at most all of user memory).  The amount of time to reclaim
        !           230:  * a page once the pageout process examines it increases with this
        !           231:  * distance and decreases as the scan rate rises.
        !           232:  */
        !           233: #define        HANDSPREAD      (2 * 1024 * 1024)
        !           234: 
        !           235: /*
        !           236:  * The number of times per second to recompute the desired paging rate
        !           237:  * and poke the pagedaemon.
        !           238:  */
        !           239: #define        RATETOSCHEDPAGING       4
        !           240: 
        !           241: /*
        !           242:  * Believed threshold (in megabytes) for which interleaved
        !           243:  * swapping area is desirable.
        !           244:  */
        !           245: #define        LOTSOFMEM       2
        !           246: 
        !           247: #define        mapin(pte, v, pfnum, prot) \
        !           248:        (*(u_int *)(pte) = ((pfnum) << PGSHIFT) | (prot), TBIS((caddr_t)(v)))
        !           249: 
        !           250: /*
        !           251:  * Mach derived constants
        !           252:  */
        !           253: 
        !           254: /* user/kernel map constants */
        !           255: #define VM_MIN_ADDRESS         ((vm_offset_t)0)
        !           256: #define VM_MAXUSER_ADDRESS     ((vm_offset_t)(0-(UPAGES*NBPG)))
        !           257: #define VM_MAX_ADDRESS         ((vm_offset_t)(0-(UPAGES*NBPG)))
        !           258: #define VM_MIN_KERNEL_ADDRESS  ((vm_offset_t)0)
        !           259: #define VM_MAX_KERNEL_ADDRESS  ((vm_offset_t)(0-NBPG))
        !           260: 
        !           261: /* virtual sizes (bytes) for various kernel submaps */
        !           262: #define VM_MBUF_SIZE           (NMBCLUSTERS*MCLBYTES)
        !           263: #define VM_KMEM_SIZE           (NKMEMCLUSTERS*CLBYTES)
        !           264: #define VM_PHYS_SIZE           (USRIOSIZE*CLBYTES)
        !           265: 
        !           266: /* # of kernel PT pages (initial only, can grow dynamically) */
        !           267: #define VM_KERNEL_PT_PAGES     ((vm_size_t)1)          /* XXX: SYSPTSIZE */
        !           268: 
        !           269: /* pcb base */
        !           270: #define        pcbb(p)         ((u_int)(p)->p_addr)

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