/*-
* Copyright (c) 2023 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#ifndef _M68K_MMU_30_H_
#define _M68K_MMU_30_H_
#include <machine/fcode.h>
/*
* The built-in MMU in the 68030 is a subset of the 68851. Section 9.6
* of the 68030 User's Manual describes the differences:
*
* The following 68851 functions are not present on the 68030:
* - Access levels
* - Breakpoint registers
* - DMA Root Pointer
* - Task aliases
* - Lockable ATC entries
* - ATC entries defined as Shared Globally
*
* Furthermore, the 68030 has some functional differences:
* - Only 22 ATC entries
* - Reduced instruction set for MMU operations
* - Reduced addressing modes for MMU instructions.
*
* Instructions removed: PVALID, PFLUSHR, PFLUSHS, PBcc, PDBcc, PScc,
* PTRAPcc, PSAVE, PRESTORE.
*
* Registers removed: CAL, VAL, BAD, BACx, DRP, AC.
*
* The 68030 does, however, add a pair of Transparent Translation
* registers
*/
/*
* 9.7.3 -- Transparent Translation registers
*
* These registers define blocks of logical address space that are
* transparently translated VA==PA. The minimum block size is 16MB,
* and the blocks may overlap. The mode in which the transparent
* translation is applied is specified by the Function Code base and
* mask fields.
*
* The Logical Address Base specifies the address of the block and
* the Logical Address Mask field specifies the address bits to *ignore*.
*
*/
#define TT30_LAB __BITS(31,24) /* Logical Address Base */
#define TT30_LAM __BITS(16,23) /* Logical Address Mask */
#define TT30_E __BIT(15) /* Enable transparent translation */
#define TT30_CI __BIT(10) /* Cache Inhibit */
#define TT30_RW __BIT(9) /* Read(1) or Write(0) translated */
#define TT30_RWM __BIT(8) /* RW field used(0) or ignored(1) */
#define TT30_FCBASE __BITS(4,6) /* Function Code base */
#define TT30_FCMASK __BITS(0,2) /* Function Code bits to ignore */
/* Convenience definitions for address space selection. */
#define TT30_USERD __SHIFTIN(FC_USERD,TT30_FCBASE)
#define TT30_USERP __SHIFTIN(FC_USERP,TT30_FCBASE)
#define TT30_SUPERD __SHIFTIN(FC_SUPERD,TT30_FCBASE)
#define TT30_SUPERP __SHIFTIN(FC_SUPERP,TT30_FCBASE)
