1 /* $NetBSD: mmu_30.h,v 1.2 2025/02/01 22:54:02 andvar Exp $ */ 2 3 /*- 4 * Copyright (c) 2023 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _M68K_MMU_30_H_ 33 #define _M68K_MMU_30_H_ 34 35 #include <machine/fcode.h> 36 37 /* 38 * The built-in MMU in the 68030 is a subset of the 68851. Section 9.6 39 * of the 68030 User's Manual describes the differences: 40 * 41 * The following 68851 functions are not present on the 68030: 42 * - Access levels 43 * - Breakpoint registers 44 * - DMA Root Pointer 45 * - Task aliases 46 * - Lockable ATC entries 47 * - ATC entries defined as Shared Globally 48 * 49 * Furthermore, the 68030 has some functional differences: 50 * - Only 22 ATC entries 51 * - Reduced instruction set for MMU operations 52 * - Reduced addressing modes for MMU instructions. 53 * 54 * Instructions removed: PVALID, PFLUSHR, PFLUSHS, PBcc, PDBcc, PScc, 55 * PTRAPcc, PSAVE, PRESTORE. 56 * 57 * Registers removed: CAL, VAL, BAD, BACx, DRP, AC. 58 * 59 * The 68030 does, however, add a pair of Transparent Translation 60 * registers 61 */ 62 63 /* 64 * 9.7.3 -- Transparent Translation registers 65 * 66 * These registers define blocks of logical address space that are 67 * transparently translated VA==PA. The minimum block size is 16MB, 68 * and the blocks may overlap. The mode in which the transparent 69 * translation is applied is specified by the Function Code base and 70 * mask fields. 71 * 72 * The Logical Address Base specifies the address of the block and 73 * the Logical Address Mask field specifies the address bits to *ignore*. 74 * 75 */ 76 #define TT30_LAB __BITS(31,24) /* Logical Address Base */ 77 #define TT30_LAM __BITS(16,23) /* Logical Address Mask */ 78 #define TT30_E __BIT(15) /* Enable transparent translation */ 79 #define TT30_CI __BIT(10) /* Cache Inhibit */ 80 #define TT30_RW __BIT(9) /* Read(1) or Write(0) translated */ 81 #define TT30_RWM __BIT(8) /* RW field used(0) or ignored(1) */ 82 #define TT30_FCBASE __BITS(4,6) /* Function Code base */ 83 #define TT30_FCMASK __BITS(0,2) /* Function Code bits to ignore */ 84 85 /* Convenience definitions for address space selection. */ 86 #define TT30_USERD __SHIFTIN(FC_USERD,TT30_FCBASE) 87 #define TT30_USERP __SHIFTIN(FC_USERP,TT30_FCBASE) 88 #define TT30_SUPERD __SHIFTIN(FC_SUPERD,TT30_FCBASE) 89 #define TT30_SUPERP __SHIFTIN(FC_SUPERP,TT30_FCBASE) 90 91 #endif /* _M68K_MMU_30_H_ */ 92