/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jeremy Cooper.
*
* 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.
*/
/*
* This file should contain the machine-dependent details about
* Page Table Entries (PTEs) and related things. For example,
* things that depend on the MMU configuration (number of levels
* in the translation structure) should go here.
*/
#ifndef _MACHINE_PTE3X_H
#define _MACHINE_PTE3X_H
#include <machine/mc68851.h>
/*************************************************************************
* Translation Control Register Settings *
*************************************************************************
* The following settings are set by the ROM monitor and used by the
* kernel. If they are changed, appropriate code must be written into
* the kernel startup to set them.
*
* A virtual address is translated into a physical address by dividing its
* bits into four fields. The first three fields are used as indexes into
* descriptor tables and the last field (the 13 lowest significant
* bits) is an offset to be added to the base address found at the final
* table. The first three fields are named TIA, TIB and TIC respectively.
* 31 12 0
* +-.-.-.-.-.-.-+-.-.-.-.-.-+-.-.-.-.-.-+-.-.-.-.-.-.-.-.-.-.-.-.-+
* | TIA | TIB | TIC | OFFSET |
* +-.-.-.-.-.-.-+-.-.-.-.-.-+-.-.-.-.-.-+-.-.-.-.-.-.-.-.-.-.-.-.-+
*/
#define MMU_TIA_SHIFT (13+6+6)
#define MMU_TIA_MASK (0xfe000000)
#define MMU_TIA_RANGE (0x02000000)
#define MMU_TIB_SHIFT (13+6)
#define MMU_TIB_MASK (0x01f80000)
#define MMU_TIB_RANGE (0x00080000)
#define MMU_TIC_SHIFT (13)
#define MMU_TIC_MASK (0x0007e000)
#define MMU_TIC_RANGE (0x00002000)
#define MMU_PAGE_SHIFT (13)
#define MMU_PAGE_MASK (0xffffe000)
#define MMU_PAGE_SIZE (0x00002000)
/*
* Macros which extract each of these fields out of a given
* VA.
*/
#define MMU_TIA(va) \
((unsigned long) ((va) & MMU_TIA_MASK) >> MMU_TIA_SHIFT)
#define MMU_TIB(va) \
((unsigned long) ((va) & MMU_TIB_MASK) >> MMU_TIB_SHIFT)
#define MMU_TIC(va) \
((unsigned long) ((va) & MMU_TIC_MASK) >> MMU_TIC_SHIFT)
/*
* The widths of the TIA, TIB, and TIC fields determine the size (in
* elements) of the tables they index.
*/
#define MMU_A_TBL_SIZE (128)
#define MMU_B_TBL_SIZE (64)
#define MMU_C_TBL_SIZE (64)
/*
* Rounding macros.
* The MMU_ROUND macros are named misleadingly. MMU_ROUND_A actually
* rounds an address to the nearest B table boundary, and so on.
* MMU_ROUND_C() is synonmous with m68k_round_page().
*/
#define MMU_ROUND_A(pa)\
((unsigned long) (pa) & MMU_TIA_MASK)
#define MMU_ROUND_UP_A(pa)\
((unsigned long) (pa + MMU_TIA_RANGE - 1) & MMU_TIA_MASK)
#define MMU_ROUND_B(pa)\
((unsigned long) (pa) & (MMU_TIA_MASK|MMU_TIB_MASK))
#define MMU_ROUND_UP_B(pa)\
((unsigned long) (pa + MMU_TIB_RANGE - 1) & (MMU_TIA_MASK|MMU_TIB_MASK))
#define MMU_ROUND_C(pa)\
((unsigned long) (pa) & MMU_PAGE_MASK)
#define MMU_ROUND_UP_C(pa)\
((unsigned long) (pa + MMU_PAGE_SIZE - 1) & MMU_PAGE_MASK)
