usr/src/sys.386bsd/vm/vm_param.h

/*
 * Copyright (c) 1991 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * The Mach Operating System project at Carnegie-Mellon University.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)vm_param.h  7.2 (Berkeley) 4/21/91
 *
 *
 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
 *
 * 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 the
 * rights to redistribute these changes.
 */

/*
 *      Machine independent virtual memory parameters.
 */

#ifndef _VM_PARAM_
#define _VM_PARAM_

#ifdef KERNEL
#include "machine/vmparam.h"
#else
#include <machine/vmparam.h>
#endif

/*
 * This belongs in types.h, but breaks too many existing programs.
 */
typedef int     boolean_t;
#define TRUE    1
#define FALSE   0

/*
 *      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.
 */

#define PAGE_SIZE       page_size       /* size of page in addressible units */
#define PAGE_SHIFT      page_shift      /* number of bits to shift for pages */

/*
 *      Return values from the VM routines.
 */
#define KERN_SUCCESS            0
#define KERN_INVALID_ADDRESS    1
#define KERN_PROTECTION_FAILURE 2
#define KERN_NO_SPACE           3
#define KERN_INVALID_ARGUMENT   4
#define KERN_FAILURE            5
#define KERN_RESOURCE_SHORTAGE  6
#define KERN_NOT_RECEIVER       7
#define KERN_NO_ACCESS          8

#ifdef  ASSEMBLER
#else   ASSEMBLER
/*
 *      Convert addresses to pages and vice versa.
 *      No rounding is used.
 */

#ifdef  KERNEL
#define atop(x)         (((unsigned)(x)) >> page_shift)
#define ptoa(x)         ((vm_offset_t)((x) << page_shift))
#endif  KERNEL

/*
 *      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.
 */

#ifdef  KERNEL
#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))
#else   KERNEL
#define round_page(x)   ((((vm_offset_t)(x) + (vm_page_size - 1)) / vm_page_size) * vm_page_size)
#define trunc_page(x)   ((((vm_offset_t)(x)) / vm_page_size) * vm_page_size)
#endif  KERNEL

#ifdef  KERNEL
extern vm_size_t        page_size;      /* machine independent page size */
extern vm_size_t        page_mask;      /* page_size - 1; mask for
                                                   offset within page */
extern int              page_shift;     /* shift to use for page size */

extern vm_size_t        mem_size;       /* size of physical memory (bytes) */
extern vm_offset_t      first_addr;     /* first physical page */
extern vm_offset_t      last_addr;      /* last physical page */
#endif  KERNEL

#endif  ASSEMBLER

#endif  _VM_PARAM_