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Annotation of kernel/mach/i386/vm_param.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright (c) 1992 NeXT Computer, Inc.
        !            27:  *
        !            28:  * Intel386 Family:    Virtual memory constants.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 14 April 1992 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35: 
        !            36: #ifndef        _MACH_I386_VM_PARAM_H_
        !            37: #define _MACH_I386_VM_PARAM_H_
        !            38: 
        !            39: #import <sys/types.h>
        !            40: 
        !            41: #define BYTE_SIZE      8       /* byte size in bits */
        !            42: #define BYTE_MSF       0
        !            43: 
        !            44: #define I386_PGBYTES   4096    /* bytes per 80386 page */
        !            45: #define I386_PGSHIFT   12      /* number of bits to shift for pages */
        !            46: 
        !            47: /*
        !            48:  *     Convert bytes to pages and convert pages to bytes.
        !            49:  *     No rounding is used.
        !            50:  */
        !            51: 
        !            52: #define i386_btop(x)           (((unsigned)(x)) >> I386_PGSHIFT)
        !            53: #define i386_ptob(x)           (((unsigned)(x)) << I386_PGSHIFT)
        !            54: 
        !            55: /*
        !            56:  *     Round off or truncate to the nearest page.  These will work
        !            57:  *     for either addresses or counts.  (i.e. 1 byte rounds to 1 page
        !            58:  *     bytes.
        !            59:  */
        !            60: 
        !            61: #define i386_round_page(x)     ((((unsigned)(x)) + I386_PGBYTES - 1) & \
        !            62:                                        ~(I386_PGBYTES-1))
        !            63: #define i386_trunc_page(x)     (((unsigned)(x)) & ~(I386_PGBYTES-1))
        !            64: 
        !            65: #define VM_MIN_ADDRESS         ((vm_offset_t) 0)
        !            66: #define VM_MAX_ADDRESS         ((vm_offset_t) 0xc0000000)
        !            67: 
        !            68: #define VM_MIN_KERNEL_ADDRESS  ((vm_offset_t) 0x00000000)
        !            69: #define VM_MAX_KERNEL_ADDRESS  ((vm_offset_t) 0x40000000)
        !            70: 
        !            71: #define KERNSTACK_SIZE         (2*I386_PGBYTES)
        !            72: #define INTSTACK_SIZE          (1*I386_PGBYTES)
        !            73: 
        !            74: /*
        !            75:  *     Conversion between 80386 pages and VM pages
        !            76:  */
        !            77: 
        !            78: #define trunc_i386_to_vm(p)    (atop(trunc_page(i386_ptob(p))))
        !            79: #define round_i386_to_vm(p)    (atop(round_page(i386_ptob(p))))
        !            80: #define vm_to_i386(p)          (i386_btop(ptoa(p)))
        !            81: 
        !            82: /*
        !            83:  * Maximum alignment required by any data type for this architecture.
        !            84:  * (Use 4 bytes for performance reasons....)
        !            85:  */
        !            86: #define        MAX_DATA_ALIGNMENT      4               /* 4 bytes */
        !            87: 
        !            88: #endif /* _MACH_I386_VM_PARAM_H_ */
        !            89: 

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