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Annotation of sys/arch/amd64/include/param.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: param.h,v 1.14 2007/05/28 21:02:49 thib Exp $ */
                      2:
                      3: /*-
                      4:  * Copyright (c) 1990 The Regents of the University of California.
                      5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to Berkeley by
                      8:  * William Jolitz.
                      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. Neither the name of the University nor the names of its contributors
                     19:  *    may be used to endorse or promote products derived from this software
                     20:  *    without specific prior written permission.
                     21:  *
                     22:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     23:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     24:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     25:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     26:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     27:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     28:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     29:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     30:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     31:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     32:  * SUCH DAMAGE.
                     33:  *
                     34:  *     @(#)param.h     5.8 (Berkeley) 6/28/91
                     35:  */
                     36:
                     37: #ifdef _KERNEL
                     38: #ifdef _LOCORE
                     39: #include <machine/psl.h>
                     40: #else
                     41: #include <machine/cpu.h>
                     42: #endif
                     43: #endif
                     44:
                     45: #define        _MACHINE        amd64
                     46: #define        MACHINE         "amd64"
                     47: #define        _MACHINE_ARCH   amd64
                     48: #define        MACHINE_ARCH    "amd64"
                     49: #define MID_MACHINE    MID_AMD64
                     50:
                     51: /*
                     52:  * Round p (pointer or byte index) up to a correctly-aligned value
                     53:  * for all data types (int, long, ...).   The result is u_long and
                     54:  * must be cast to any desired pointer type.
                     55:  *
                     56:  * ALIGNED_POINTER is a boolean macro that checks whether an address
                     57:  * is valid to fetch data elements of type t from on this architecture.
                     58:  * This does not reflect the optimal alignment, just the possibility
                     59:  * (within reasonable limits).
                     60:  *
                     61:  */
                     62: #define ALIGNBYTES             (sizeof(long) - 1)
                     63: #define ALIGN(p)               (((u_long)(p) + ALIGNBYTES) &~ALIGNBYTES)
                     64: #define ALIGNED_POINTER(p,t)   1
                     65:
                     66: #define        PGSHIFT         12              /* LOG2(NBPG) */
                     67: #define        NBPG            (1 << PGSHIFT)  /* bytes/page */
                     68: #define        PGOFSET         (NBPG-1)        /* byte offset into page */
                     69:
                     70: #define PAGE_SHIFT     12
                     71: #define PAGE_SIZE      (1 << PAGE_SHIFT)
                     72: #define PAGE_MASK      (PAGE_SIZE - 1)
                     73:
                     74: #define        NPTEPG          (NBPG/(sizeof (pt_entry_t)))
                     75:
                     76: #define        KERNBASE        0xffffffff80000000 /* start of kernel virtual space */
                     77: #define KERNTEXTOFF    (KERNBASE+0x100000)     /* start of kernel text */
                     78:
                     79: #define KERNTEXTOFF_HI 0xffffffff
                     80: #define KERNTEXTOFF_LO 0x80100000
                     81:
                     82: #define KERNBASE_HI    0xffffffff
                     83: #define KERNBASE_LO    0x80000000
                     84:
                     85: #define        DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
                     86: #define        DEV_BSIZE       (1 << DEV_BSHIFT)
                     87: #define        BLKDEV_IOSIZE   2048
                     88: #ifndef        MAXPHYS
                     89: #define        MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
                     90: #endif
                     91:
                     92: #define        UPAGES          5               /* pages of u-area */
                     93: #define        USPACE          (UPAGES * NBPG) /* total size of u-area */
                     94: #define        USPACE_ALIGN    (0)             /* u-area alignment 0-none */
                     95:
                     96: #ifndef MSGBUFSIZE
                     97: #define MSGBUFSIZE     4*NBPG          /* default message buffer size */
                     98: #endif
                     99:
                    100: /*
                    101:  * Constants related to network buffer management.
                    102:  */
                    103: #define        NMBCLUSTERS     6144            /* map size, max cluster allocation */
                    104:
                    105: /*
                    106:  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
                    107:  * logical pages.
                    108:  */
                    109: #define        NKMEMPAGES_MIN_DEFAULT  ((8 * 1024 * 1024) >> PAGE_SHIFT)
                    110: #define        NKMEMPAGES_MAX_DEFAULT  ((128 * 1024 * 1024) >> PAGE_SHIFT)
                    111:
                    112: /* pages ("clicks") to disk blocks */
                    113: #define        ctod(x)         ((x) << (PGSHIFT - DEV_BSHIFT))
                    114: #define        dtoc(x)         ((x) >> (PGSHIFT - DEV_BSHIFT))
                    115:
                    116: /* bytes to pages */
                    117: #define        ctob(x)         ((x) << PGSHIFT)
                    118: #define        btoc(x)         (((x) + PGOFSET) >> PGSHIFT)
                    119:
                    120: /* bytes to disk blocks */
                    121: #define        dbtob(x)        ((x) << DEV_BSHIFT)
                    122: #define        btodb(x)        ((x) >> DEV_BSHIFT)
                    123:
                    124: /*
                    125:  * Mach derived conversion macros
                    126:  */
                    127: #define        x86_round_pdr(x) \
                    128:        ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
                    129: #define        x86_trunc_pdr(x)        ((unsigned long)(x) & ~(NBPD_L2 - 1))