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Annotation of kernel/mach/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:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: /*
        !            51:  *     File:   mach/vm_param.h
        !            52:  *     Author: Avadis Tevanian, Jr., Michael Wayne Young
        !            53:  *     Date:   1985
        !            54:  *
        !            55:  *     Machine independent virtual memory parameters.
        !            56:  *
        !            57:  */
        !            58: 
        !            59: #ifndef        _MACH_VM_PARAM_H_
        !            60: #define _MACH_VM_PARAM_H_
        !            61: 
        !            62: #import <mach/machine/vm_param.h>
        !            63: #import <mach/machine/vm_types.h>
        !            64: 
        !            65: #ifdef KERNEL
        !            66: /*
        !            67:  *     The machine independent pages are refered to as PAGES.  A page
        !            68:  *     is some number of hardware pages, depending on the target machine.
        !            69:  */
        !            70: 
        !            71: /*
        !            72:  *     All references to the size of a page should be done with PAGE_SIZE
        !            73:  *     or PAGE_SHIFT.  The fact they are variables is hidden here so that
        !            74:  *     we can easily make them constant if we so desire.
        !            75:  */
        !            76: 
        !            77: /*
        !            78:  *     Regardless whether it is implemented with a constant or a variable,
        !            79:  *     the PAGE_SIZE is assumed to be a power of two throughout the
        !            80:  *     virtual memory system implementation.
        !            81:  */
        !            82: 
        !            83: #ifndef        PAGE_SIZE_FIXED
        !            84: #define PAGE_SIZE      page_size       /* size of page in addressible units */
        !            85: #define PAGE_SHIFT     page_shift      /* number of bits to shift for pages */
        !            86: #endif /* PAGE_SIZE_FIXED */
        !            87: 
        !            88: #ifndef        __ASSEMBLER__
        !            89: /*
        !            90:  *     Convert addresses to pages and vice versa.
        !            91:  *     No rounding is used.
        !            92:  */
        !            93: 
        !            94: #define atop(x)                (((vm_size_t)(x)) >> page_shift)
        !            95: #define ptoa(x)                ((vm_offset_t)((x) << page_shift))
        !            96: 
        !            97: /*
        !            98:  *     Round off or truncate to the nearest page.  These will work
        !            99:  *     for either addresses or counts.  (i.e. 1 byte rounds to 1 page
        !           100:  *     bytes.
        !           101:  */
        !           102: 
        !           103: #define round_page(x)  ((vm_offset_t)((((vm_offset_t)(x)) + page_mask) & ~page_mask))
        !           104: #define trunc_page(x)  ((vm_offset_t)(((vm_offset_t)(x)) & ~page_mask))
        !           105: 
        !           106: /*
        !           107:  *     Determine whether an address is page-aligned, or a count is
        !           108:  *     an exact page multiple.
        !           109:  */
        !           110: 
        !           111: #define        page_aligned(x) ((((vm_offset_t) (x)) & page_mask) == 0)
        !           112: 
        !           113: #ifndef        PAGE_SIZE_FIXED
        !           114: extern vm_size_t       page_size;      /* machine independent page size */
        !           115: extern vm_size_t       page_mask;      /* page_size - 1; mask for
        !           116:                                                   offset within page */
        !           117: extern int             page_shift;     /* shift to use for page size */
        !           118: #else  /* PAGE_SIZE_FIXED */
        !           119: #define        page_mask       (PAGE_SIZE-1)
        !           120: #endif /* PAGE_SIZE_FIXED */
        !           121: 
        !           122: extern vm_size_t       mem_size;       /* size of physical memory (bytes) */
        !           123: extern vm_offset_t     first_addr;     /* first physical page */
        !           124: extern vm_offset_t     last_addr;      /* last physical page */
        !           125: 
        !           126: #endif /* __ASSEMBLER__ */
        !           127: 
        !           128: #else
        !           129: #define        round_page(x)   ((((vm_offset_t)(x) + (vm_page_size - 1)) \
        !           130:                                                / vm_page_size) * vm_page_size)
        !           131: #define        trunc_page(x)   ((((vm_offset_t)(x)) / vm_page_size) * vm_page_size)
        !           132: #endif
        !           133: 
        !           134: #endif /* _MACH_VM_PARAM_H_ */

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