/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ /* * Mach Operating System * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ /* */ /* * File: mach/vm_param.h * Author: Avadis Tevanian, Jr., Michael Wayne Young * Date: 1985 * * Machine independent virtual memory parameters. * */ #ifndef _MACH_VM_PARAM_H_ #define _MACH_VM_PARAM_H_ #ifndef KERNEL_PRIVATE #error YOU HAVE MADE A MISTAKE BY INCLUDING THIS FILE; #error #error THIS FILE SHOULD NOT BE VISIBLE TO USER PROGRAMS. #error #error USE <mach/machine/vm_param.h> TO GET MACHINE-DEPENDENT ADDRESS #error SPACE AND PAGE SIZE ITEMS. #error #error USE <mach/machine/vm_types.h> TO GET TYPE DECLARATIONS USED IN #error THE MACH KERNEL INTERFACE. #error #error IN ALL PROBABILITY, YOU SHOULD GET ALL OF THE TYPES USED IN THE #error INTERFACE FROM <mach/mach_types.h> #endif /* KERNEL_PRIVATE */ #include <mach/machine/vm_param.h> #include <mach/machine/vm_types.h> /* * The machine independent pages are refered to as PAGES. A page * is some number of hardware pages, depending on the target machine. */ /* * All references to the size of a page should be done with PAGE_SIZE * or PAGE_SHIFT. The fact they are variables is hidden here so that * we can easily make them constant if we so desire. */ /* * Regardless whether it is implemented with a constant or a variable, * the PAGE_SIZE is assumed to be a power of two throughout the * virtual memory system implementation. */ #ifndef PAGE_SIZE_FIXED extern vm_size_t page_size; extern vm_size_t page_mask; extern int page_shift; #define PAGE_SIZE page_size /* pagesize in addr units */ #define PAGE_SHIFT page_shift /* number of bits to shift for pages */ #define PAGE_MASK page_mask /* mask for off in page */ #define PAGE_SIZE_64 (unsigned long long)page_size /* pagesize in addr units */ #define PAGE_MASK_64 (unsigned long long)page_mask /* mask for off in page */ #else /* PAGE_SIZE_FIXED */ #define PAGE_SIZE 4096 #define PAGE_SHIFT 12 #define PAGE_MASK (PAGE_SIZE-1) #define PAGE_SIZE_64 (unsigned long long)4096 #define PAGE_MASK_64 (PAGE_SIZE_64-1) #endif /* PAGE_SIZE_FIXED */ #ifndef ASSEMBLER /* * Convert addresses to pages and vice versa. * No rounding is used. */ #define atop(x) (((natural_t)(x)) >> PAGE_SHIFT) #define ptoa(x) ((vm_offset_t)((x) << PAGE_SHIFT)) /* * Round off or truncate to the nearest page. These will work * for either addresses or counts. (i.e. 1 byte rounds to 1 page * bytes. */ #define round_page(x) ((vm_offset_t)((((vm_offset_t)(x)) + PAGE_MASK) & ~PAGE_MASK)) #define trunc_page(x) ((vm_offset_t)(((vm_offset_t)(x)) & ~PAGE_MASK)) #define round_page_64(x) ((unsigned long long)((((unsigned long long)(x)) + PAGE_MASK_64) & ~PAGE_MASK_64)) #define trunc_page_64(x) ((unsigned long long)(((unsigned long long)(x)) & ~PAGE_MASK_64)) /* * Determine whether an address is page-aligned, or a count is * an exact page multiple. */ #define page_aligned(x) ((((vm_object_offset_t) (x)) & PAGE_MASK) == 0) extern vm_size_t mem_size; /* size of physical memory (bytes) */ #endif /* ASSEMBLER */ #endif /* _MACH_VM_PARAM_H_ */