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Annotation of sys/arch/i386/include/param.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: param.h,v 1.40 2007/05/28 21:02:49 thib Exp $ */
                      2: /*     $NetBSD: param.h,v 1.29 1996/03/04 05:04:26 cgd Exp $   */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1990 The Regents of the University of California.
                      6:  * All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to Berkeley by
                      9:  * William Jolitz.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  *
                     35:  *     @(#)param.h     5.8 (Berkeley) 6/28/91
                     36:  */
                     37:
                     38: /*
                     39:  * Machine dependent constants for Intel 386.
                     40:  */
                     41:
                     42: #ifdef _KERNEL
                     43: #ifdef _LOCORE
                     44: #include <machine/psl.h>
                     45: #else
                     46: #include <machine/cpu.h>
                     47: #endif
                     48: #endif
                     49:
                     50: #define        _MACHINE        i386
                     51: #define        MACHINE         "i386"
                     52: #define        _MACHINE_ARCH   i386
                     53: #define        MACHINE_ARCH    "i386"
                     54: #define        MID_MACHINE     MID_I386
                     55:
                     56: /*
                     57:  * Round p (pointer or byte index) up to a correctly-aligned value
                     58:  * for all data types (int, long, ...).   The result is u_int and
                     59:  * must be cast to any desired pointer type.
                     60:  *
                     61:  * ALIGNED_POINTER is a boolean macro that checks whether an address
                     62:  * is valid to fetch data elements of type t from on this architecture.
                     63:  * This does not reflect the optimal alignment, just the possibility
                     64:  * (within reasonable limits).
                     65:  */
                     66: #define ALIGNBYTES     (sizeof(int) - 1)
                     67: #define ALIGN(p)       (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
                     68: #define ALIGNED_POINTER(p,t)   1
                     69:
                     70: #define        PGSHIFT         12              /* LOG2(NBPG) */
                     71: #define        NBPG            (1 << PGSHIFT)  /* bytes/page */
                     72: #define        PGOFSET         (NBPG-1)        /* byte offset into page */
                     73:
                     74: #define PAGE_SHIFT     12
                     75: #define PAGE_SIZE      (1 << PAGE_SHIFT)
                     76: #define PAGE_MASK      (PAGE_SIZE - 1)
                     77:
                     78: #define        NPTEPG          (NBPG/(sizeof (pt_entry_t)))
                     79:
                     80: /*
                     81:  * Start of kernel virtual space.  Remember to alter the memory and
                     82:  * page table layout description in pmap.h when changing this.
                     83:  */
                     84: #define        KERNBASE        0xd0000000
                     85:
                     86: #define        KERNTEXTOFF     (KERNBASE+0x200000)     /* start of kernel text */
                     87:
                     88: #define        DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
                     89: #define        DEV_BSIZE       (1 << DEV_BSHIFT)
                     90: #define        BLKDEV_IOSIZE   2048
                     91: #ifndef        MAXPHYS
                     92: #define        MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
                     93: #endif
                     94:
                     95: #define        UPAGES          2               /* pages of u-area */
                     96: #define        USPACE          (UPAGES * NBPG) /* total size of u-area */
                     97: #define        USPACE_ALIGN    (0)             /* u-area alignment 0-none */
                     98:
                     99: #ifndef MSGBUFSIZE
                    100: #define MSGBUFSIZE     4*NBPG          /* default message buffer size */
                    101: #endif
                    102:
                    103: /*
                    104:  * Constants related to network buffer management.
                    105:  */
                    106: #define        NMBCLUSTERS     6144            /* map size, max cluster allocation */
                    107:
                    108: /*
                    109:  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
                    110:  * logical pages.
                    111:  */
                    112: #define        NKMEMPAGES_MIN_DEFAULT  ((8 * 1024 * 1024) >> PAGE_SHIFT)
                    113: #define        NKMEMPAGES_MAX_DEFAULT  ((64 * 1024 * 1024) >> PAGE_SHIFT)
                    114:
                    115: /* pages ("clicks") to disk blocks */
                    116: #define        ctod(x)         ((x) << (PGSHIFT - DEV_BSHIFT))
                    117: #define        dtoc(x)         ((x) >> (PGSHIFT - DEV_BSHIFT))
                    118:
                    119: /* bytes to pages */
                    120: #define        ctob(x)         ((x) << PGSHIFT)
                    121: #define        btoc(x)         (((x) + PGOFSET) >> PGSHIFT)
                    122:
                    123: /* bytes to disk blocks */
                    124: #define        dbtob(x)        ((x) << DEV_BSHIFT)
                    125: #define        btodb(x)        ((x) >> DEV_BSHIFT)
                    126:
                    127: /*
                    128:  * Mach derived conversion macros
                    129:  */
                    130: #define        i386_round_pdr(x)       ((((unsigned)(x)) + PDOFSET) & ~PDOFSET)
                    131: #define        i386_trunc_pdr(x)       ((unsigned)(x) & ~PDOFSET)