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/* $OpenBSD: mmu.h,v 1.11 2007/11/21 21:45:47 miod Exp $ */
/*
* This file bears almost no resemblance to the original m68k file,
* so the following copyright notice is questionable, but we are
* nice people.
*/
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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. 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.
*
* from: Utah $Hdr: pte.h 1.13 92/01/20$
*
* @(#)pte.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _MACHINE_MMU_H_
#define _MACHINE_MMU_H_
/*
* Parameters which determine the 'geometry' of the m88K page tables in memory.
*/
#define SDT_BITS 10 /* M88K segment table size bits */
#define PDT_BITS 10 /* M88K page table size bits */
#define PG_BITS PAGE_SHIFT /* M88K hardware page size bits */
/*
* Common fields for APR, SDT and PTE
*/
/* address frame */
#define PG_FRAME 0xfffff000
#define PG_SHIFT PG_BITS
#define PG_PFNUM(x) (((x) & PG_FRAME) >> PG_SHIFT)
/* cache control bits */
#define CACHE_DFL 0x00000000
#define CACHE_INH 0x00000040 /* cache inhibit */
#define CACHE_GLOBAL 0x00000080 /* global scope */
#define CACHE_WT 0x00000200 /* write through */
#define CACHE_MASK (CACHE_INH | CACHE_GLOBAL | CACHE_WT)
/*
* Area descriptors
*/
typedef u_int32_t apr_t;
#define APR_V 0x00000001 /* valid bit */
/*
* 88200 PATC (TLB)
*/
#define PATC_ENTRIES 56
/*
* BATC entries
*/
#define BATC_V 0x00000001
#define BATC_PROT 0x00000002
#define BATC_INH 0x00000004
#define BATC_GLOBAL 0x00000008
#define BATC_WT 0x00000010
#define BATC_SO 0x00000020
/*
* Segment table entries
*/
typedef u_int32_t sdt_entry_t;
#define SG_V 0x00000001
#define SG_NV 0x00000000
#define SG_PROT 0x00000004
#define SG_RO 0x00000004
#define SG_RW 0x00000000
#define SG_SO 0x00000100
#define SDT_VALID(sdt) (*(sdt) & SG_V)
#define SDT_SUP(sdt) (*(sdt) & SG_SO)
#define SDT_WP(sdt) (*(sdt) & SG_PROT)
/*
* Page table entries
*/
typedef u_int32_t pt_entry_t;
#define PG_V 0x00000001
#define PG_NV 0x00000000
#define PG_PROT 0x00000004
#define PG_U 0x00000008
#define PG_M 0x00000010
#define PG_M_U 0x00000018
#define PG_RO 0x00000004
#define PG_RW 0x00000000
#define PG_SO 0x00000100
#define PG_W 0x00000020 /* XXX unused but reserved field */
#define PG_U0 0x00000400 /* U0 bit for M88110 */
#define PG_U1 0x00000800 /* U1 bit for M88110 */
#define PDT_VALID(pte) (*(pte) & PG_V)
#define PDT_SUP(pte) (*(pte) & PG_SO)
#define PDT_WP(pte) (*(pte) & PG_PROT)
/*
* Indirect descriptors (mc8110)
*/
typedef u_int32_t pt_ind_entry_t;
/* validity bits */
#define IND_V 0x00000001
#define IND_NV 0x00000000
#define IND_MASKED 0x00000002
#define IND_UNMASKED 0x00000003
#define IND_MASK 0x00000003
#define IND_FRAME 0xfffffffc
#define IND_SHIFT 2
#define IND_PDA(x) ((x) & IND_FRAME >> IND_SHIFT)
/*
* Number of entries in a page table.
*/
#define SDT_ENTRIES (1<<(SDT_BITS))
#define PDT_ENTRIES (1<<(PDT_BITS))
/*
* Size in bytes of a single page table.
*/
#define SDT_SIZE (sizeof(sdt_entry_t) * SDT_ENTRIES)
#define PDT_SIZE (sizeof(pt_entry_t) * PDT_ENTRIES)
/*
* Shifts and masks
*/
#define SDT_SHIFT (PDT_BITS + PG_BITS)
#define PDT_SHIFT (PG_BITS)
#define SDT_MASK (((1 << SDT_BITS) - 1) << SDT_SHIFT)
#define PDT_MASK (((1 << PDT_BITS) - 1) << PDT_SHIFT)
#define SDTIDX(va) (((va) & SDT_MASK) >> SDT_SHIFT)
#define PDTIDX(va) (((va) & PDT_MASK) >> PDT_SHIFT)
/*
* Parameters and macros for BATC
*/
/* number of bits to BATC shift (log2(BATC_BLKBYTES)) */
#define BATC_BLKSHIFT 19
/* 'block' size of a BATC entry mapping */
#define BATC_BLKBYTES (1 << BATC_BLKSHIFT)
/* BATC block mask */
#define BATC_BLKMASK (BATC_BLKBYTES-1)
/* number of BATC entries */
#define BATC_MAX 8
/* physical and logical block address */
#define BATC_PSHIFT 6
#define BATC_VSHIFT (BATC_PSHIFT + (32 - BATC_BLKSHIFT))
#define BATC_BLK_ALIGNED(x) ((x & BATC_BLKMASK) == 0)
#define M88K_BTOBLK(x) (x >> BATC_BLKSHIFT)
static pt_entry_t invalidate_pte(pt_entry_t *);
static __inline__ pt_entry_t
invalidate_pte(pt_entry_t *pte)
{
pt_entry_t oldpte;
oldpte = PG_NV;
__asm__ __volatile__
("xmem %0, %2, r0" : "+r"(oldpte), "+m"(*pte) : "r"(pte));
return oldpte;
}
#endif /* __MACHINE_MMU_H__ */
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