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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989,1988 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: vm_param.h
* Author: Avadis Tevanian, Jr.
* Date: 1985
*
* I386 machine dependent virtual memory parameters.
* Most of the declarations are preceeded by I386_ (or i386_)
* which is OK because only I386 specific code will be using
* them.
*/
#ifndef _MACH_I386_VM_PARAM_H_
#define _MACH_I386_VM_PARAM_H_
#include <mach/machine/vm_types.h>
#define BYTE_SIZE 8 /* byte size in bits */
#define I386_PGBYTES 4096 /* bytes per 80386 page */
#define I386_PGSHIFT 12 /* number of bits to shift for pages */
/* Virtual page size is the same as real page size - 4K is big enough. */
#define PAGE_SHIFT I386_PGSHIFT
/*
* Convert bytes to pages and convert pages to bytes.
* No rounding is used.
*/
#define i386_btop(x) (((unsigned long)(x)) >> I386_PGSHIFT)
#define i386_ptob(x) (((unsigned long)(x)) << I386_PGSHIFT)
/*
* 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 i386_round_page(x) ((((unsigned long)(x)) + I386_PGBYTES - 1) & \
~(I386_PGBYTES-1))
#define i386_trunc_page(x) (((unsigned long)(x)) & ~(I386_PGBYTES-1))
/* User address spaces are 3GB each,
starting at virtual and linear address 0.
VM_MAX_ADDRESS can be reduced to leave more space for the kernel, but must
not be increased to more than 3GB as glibc and hurd servers would not cope
with that.
*/
#define VM_MIN_ADDRESS (0)
#define VM_MAX_ADDRESS (0xc0000000UL)
#endif /* _MACH_I386_VM_PARAM_H_ */
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