Annotation of sys/arch/m88k/include/mmu.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mmu.h,v 1.8 2006/05/21 20:55:43 miod Exp $ */
! 2:
! 3: /*
! 4: * This file bears almost no resemblance to the original m68k file,
! 5: * so the following copyright notice is questionable, but we are
! 6: * nice people.
! 7: */
! 8:
! 9: /*
! 10: * Copyright (c) 1988 University of Utah.
! 11: * Copyright (c) 1982, 1986, 1990, 1993
! 12: * The Regents of the University of California. All rights reserved.
! 13: *
! 14: * This code is derived from software contributed to Berkeley by
! 15: * the Systems Programming Group of the University of Utah Computer
! 16: * Science Department.
! 17: *
! 18: * Redistribution and use in source and binary forms, with or without
! 19: * modification, are permitted provided that the following conditions
! 20: * are met:
! 21: * 1. Redistributions of source code must retain the above copyright
! 22: * notice, this list of conditions and the following disclaimer.
! 23: * 2. Redistributions in binary form must reproduce the above copyright
! 24: * notice, this list of conditions and the following disclaimer in the
! 25: * documentation and/or other materials provided with the distribution.
! 26: * 3. Neither the name of the University nor the names of its contributors
! 27: * may be used to endorse or promote products derived from this software
! 28: * without specific prior written permission.
! 29: *
! 30: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 31: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 32: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 33: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 34: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 35: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 36: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 37: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 38: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 39: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 40: * SUCH DAMAGE.
! 41: *
! 42: * from: Utah $Hdr: pte.h 1.13 92/01/20$
! 43: *
! 44: * @(#)pte.h 8.1 (Berkeley) 6/10/93
! 45: */
! 46:
! 47: #ifndef _MACHINE_MMU_H_
! 48: #define _MACHINE_MMU_H_
! 49:
! 50: /*
! 51: * Parameters which determine the 'geometry' of the m88K page tables in memory.
! 52: */
! 53:
! 54: #define SDT_BITS 10 /* M88K segment table size bits */
! 55: #define PDT_BITS 10 /* M88K page table size bits */
! 56: #define PG_BITS PAGE_SHIFT /* M88K hardware page size bits */
! 57:
! 58: /*
! 59: * Common fields for APR, SDT and PTE
! 60: */
! 61:
! 62: /* address frame */
! 63: #define PG_FRAME 0xfffff000
! 64: #define PG_SHIFT PG_BITS
! 65: #define PG_PFNUM(x) (((x) & PG_FRAME) >> PG_SHIFT)
! 66:
! 67: /* cache control bits */
! 68: #define CACHE_DFL 0x00000000
! 69: #define CACHE_INH 0x00000040 /* cache inhibit */
! 70: #define CACHE_GLOBAL 0x00000080 /* global scope */
! 71: #define CACHE_WT 0x00000200 /* write through */
! 72:
! 73: #define CACHE_MASK (CACHE_INH | CACHE_GLOBAL | CACHE_WT)
! 74:
! 75: /*
! 76: * Area descriptors
! 77: */
! 78:
! 79: typedef u_int32_t apr_t;
! 80:
! 81: #define APR_V 0x00000001 /* valid bit */
! 82:
! 83: /*
! 84: * 88200 PATC (TLB)
! 85: */
! 86:
! 87: #define PATC_ENTRIES 56
! 88:
! 89: /*
! 90: * BATC entries
! 91: */
! 92:
! 93: #define BATC_V 0x00000001
! 94: #define BATC_PROT 0x00000002
! 95: #define BATC_INH 0x00000004
! 96: #define BATC_GLOBAL 0x00000008
! 97: #define BATC_WT 0x00000010
! 98: #define BATC_SO 0x00000020
! 99:
! 100:
! 101: /*
! 102: * Segment table entries
! 103: */
! 104:
! 105: typedef u_int32_t sdt_entry_t;
! 106:
! 107: #define SG_V 0x00000001
! 108: #define SG_NV 0x00000000
! 109: #define SG_PROT 0x00000004
! 110: #define SG_RO 0x00000004
! 111: #define SG_RW 0x00000000
! 112: #define SG_SO 0x00000100
! 113:
! 114: #define SDT_VALID(sdt) (*(sdt) & SG_V)
! 115: #define SDT_SUP(sdt) (*(sdt) & SG_SO)
! 116: #define SDT_WP(sdt) (*(sdt) & SG_PROT)
! 117:
! 118: /*
! 119: * Page table entries
! 120: */
! 121:
! 122: typedef u_int32_t pt_entry_t;
! 123:
! 124: #define PG_V 0x00000001
! 125: #define PG_NV 0x00000000
! 126: #define PG_PROT 0x00000004
! 127: #define PG_U 0x00000008
! 128: #define PG_M 0x00000010
! 129: #define PG_M_U 0x00000018
! 130: #define PG_RO 0x00000004
! 131: #define PG_RW 0x00000000
! 132: #define PG_SO 0x00000100
! 133: #define PG_W 0x00000020 /* XXX unused but reserved field */
! 134: #define PG_U0 0x00000400 /* U0 bit for M88110 */
! 135: #define PG_U1 0x00000800 /* U1 bit for M88110 */
! 136:
! 137: #define PDT_VALID(pte) (*(pte) & PG_V)
! 138: #define PDT_SUP(pte) (*(pte) & PG_SO)
! 139: #define PDT_WP(pte) (*(pte) & PG_PROT)
! 140:
! 141: /*
! 142: * Indirect descriptors (mc81110)
! 143: */
! 144:
! 145: typedef u_int32_t pt_ind_entry_t;
! 146:
! 147: /* validity bits */
! 148: #define IND_V 0x00000001
! 149: #define IND_NV 0x00000000
! 150: #define IND_MASKED 0x00000002
! 151: #define IND_UNMASKED 0x00000003
! 152: #define IND_MASK 0x00000003
! 153:
! 154: #define IND_FRAME 0xfffffffc
! 155: #define IND_SHIFT 2
! 156:
! 157: #define IND_PDA(x) ((x) & IND_FRAME >> IND_SHIFT)
! 158:
! 159: /*
! 160: * Number of entries in a page table.
! 161: */
! 162:
! 163: #define SDT_ENTRIES (1<<(SDT_BITS))
! 164: #define PDT_ENTRIES (1<<(PDT_BITS))
! 165:
! 166: /*
! 167: * Size in bytes of a single page table.
! 168: */
! 169:
! 170: #define SDT_SIZE (sizeof(sdt_entry_t) * SDT_ENTRIES)
! 171: #define PDT_SIZE (sizeof(pt_entry_t) * PDT_ENTRIES)
! 172:
! 173: /*
! 174: * Shifts and masks
! 175: */
! 176:
! 177: #define SDT_SHIFT (PDT_BITS + PG_BITS)
! 178: #define PDT_SHIFT (PG_BITS)
! 179:
! 180: #define SDT_MASK (((1 << SDT_BITS) - 1) << SDT_SHIFT)
! 181: #define PDT_MASK (((1 << PDT_BITS) - 1) << PDT_SHIFT)
! 182:
! 183: #define SDTIDX(va) (((va) & SDT_MASK) >> SDT_SHIFT)
! 184: #define PDTIDX(va) (((va) & PDT_MASK) >> PDT_SHIFT)
! 185:
! 186: /*
! 187: * Parameters and macros for BATC
! 188: */
! 189:
! 190: /* number of bits to BATC shift (log2(BATC_BLKBYTES)) */
! 191: #define BATC_BLKSHIFT 19
! 192: /* 'block' size of a BATC entry mapping */
! 193: #define BATC_BLKBYTES (1 << BATC_BLKSHIFT)
! 194: /* BATC block mask */
! 195: #define BATC_BLKMASK (BATC_BLKBYTES-1)
! 196: /* number of BATC entries */
! 197: #define BATC_MAX 8
! 198:
! 199: /* physical and logical block address */
! 200: #define BATC_PSHIFT 6
! 201: #define BATC_VSHIFT (BATC_PSHIFT + (32 - BATC_BLKSHIFT))
! 202:
! 203: #define BATC_BLK_ALIGNED(x) ((x & BATC_BLKMASK) == 0)
! 204:
! 205: #define M88K_BTOBLK(x) (x >> BATC_BLKSHIFT)
! 206:
! 207: static pt_entry_t invalidate_pte(pt_entry_t *);
! 208: static __inline__ pt_entry_t
! 209: invalidate_pte(pt_entry_t *pte)
! 210: {
! 211: pt_entry_t oldpte;
! 212:
! 213: oldpte = PG_NV;
! 214: __asm__ __volatile__
! 215: ("xmem %0, %2, r0" : "=r"(oldpte) : "0"(oldpte), "r"(pte));
! 216: __asm__ __volatile__ ("tb1 0, r0, 0");
! 217: return oldpte;
! 218: }
! 219:
! 220: #endif /* __MACHINE_MMU_H__ */
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