/* $OpenBSD: mmu.h,v 1.18 2025/11/24 20:57:53 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 _M88K_MMU_H_ #define _M88K_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 uint32_t apr_t; #define APR_V 0x00000001 /* valid bit */ /* * 88200 PATC (TLB) */ #define PATC_ENTRIES 56 /* * Segment table entries */ typedef uint32_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) /* * Page table entries */ typedef uint32_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) /* * 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) /* * 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 typedef uint32_t batc_t; /* 8820x fixed size BATC */ #define BATC_BLKSHIFT 19 #define BATC_BLKBYTES (1 << BATC_BLKSHIFT) #define BATC_BLKMASK (BATC_BLKBYTES-1) /* number of programmable BATC entries */ #define BATC_MAX 8 /* physical and logical block address */ #define BATC_PSHIFT 6 #define BATC_VSHIFT 19 #define trunc_batc(a) ((a) & ~BATC_BLKMASK) #define round_batc(a) trunc_batc((a) + BATC_BLKBYTES - 1) #endif /* __M88K_MMU_H__ */
