111 lines
3.8 KiB
C
111 lines
3.8 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)param.h 5.8 (Berkeley) 6/28/91
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* $FreeBSD$
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*/
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#include <machine/_align.h>
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#ifndef _I386_INCLUDE_PARAM_H_
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#define _I386_INCLUDE_PARAM_H_
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/*
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* Machine dependent constants for Intel 386.
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*/
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/*
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* Round p (pointer or byte index) up to a correctly-aligned value
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* for all data types (int, long, ...). The result is unsigned int
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* and must be cast to any desired pointer type.
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*/
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#ifndef _ALIGNBYTES
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#define _ALIGNBYTES (sizeof(int) - 1)
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#endif
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#ifndef _ALIGN
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#define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
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#endif
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#define ALIGNBYTES _ALIGNBYTES
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#define ALIGN(p) _ALIGN(p)
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/*
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* ALIGNED_POINTER is a boolean macro that checks whether an address
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* is valid to fetch data elements of type t from on this architecture.
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* This does not reflect the optimal alignment, just the possibility
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* (within reasonable limits).
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*/
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#define ALIGNED_POINTER(p, t) 1
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#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
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#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
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#define PAGE_MASK (PAGE_SIZE-1)
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#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
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#ifdef PAE
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#define NPGPTD 4
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#define PDRSHIFT 21 /* LOG2(NBPDR) */
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#define NPGPTD_SHIFT 9
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#else
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#define NPGPTD 1
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#define PDRSHIFT 22 /* LOG2(NBPDR) */
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#define NPGPTD_SHIFT 10
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#endif
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#define NBPTD (NPGPTD<<PAGE_SHIFT)
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#define NPDEPTD (NBPTD/(sizeof (pd_entry_t)))
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#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
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#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
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#define PDRMASK (NBPDR-1)
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#define MAXPAGESIZES 2 /* maximum number of supported page sizes */
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/*
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* Mach derived conversion macros
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*/
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#define trunc_page(x) ((x) & ~PAGE_MASK)
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#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
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#define trunc_4mpage(x) ((x) & ~PDRMASK)
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#define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK)
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#define atop(x) ((x) >> PAGE_SHIFT)
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#define ptoa(x) ((x) << PAGE_SHIFT)
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#define i386_btop(x) ((x) >> PAGE_SHIFT)
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#define i386_ptob(x) ((x) << PAGE_SHIFT)
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#define pgtok(x) ((x) * (PAGE_SIZE / 1024))
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#define trunc_page_ps(va, ps) ((va) & ~(ps - 1))
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#define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1))
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#define _minix_aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
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#endif /* !_I386_INCLUDE_PARAM_H_ */
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