91 lines
3.7 KiB
C
91 lines
3.7 KiB
C
/* $NetBSD: dvma3.h,v 1.7 1997/10/17 03:20:13 gwr Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1996 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Gordon W. Ross.
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation 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 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.
|
|
*/
|
|
|
|
/*
|
|
* DVMA (Direct Virtual Memory Access - like DMA)
|
|
*
|
|
* The Sun3 MMU is presented to secondary masters using DVMA.
|
|
* Before such devices can access kernel memory, that memory
|
|
* must be mapped into the kernel DVMA space. All DVMA space
|
|
* is presented as slave-accessible memory for VME and OBIO
|
|
* devices, though not at the same address seen by the CPU.
|
|
*
|
|
* Relevant parts of virtual memory map are:
|
|
*
|
|
* 0FE0.0000 monitor map (devices)
|
|
* 0FF0.0000 DVMA space
|
|
* 0FFE.0000 monitor RAM seg.
|
|
* 0FFF.E000 monitor RAM page
|
|
*
|
|
* Note that while the DVMA harware makes the last 1MB visible
|
|
* for secondary masters, the PROM "owns" the last page of it.
|
|
* Also note that OBIO devices can actually see the last 16MB
|
|
* of kernel virtual space. That can be mostly ignored, except
|
|
* when calculating the alias address for slave access.
|
|
*/
|
|
|
|
/*
|
|
* To convert an address in DVMA space to a slave address,
|
|
* just use a logical AND with one of the following masks.
|
|
* To convert back, just logical OR with the base address.
|
|
*/
|
|
#define DVMA_OBIO_SLAVE_BASE 0x0F000000
|
|
#define DVMA_OBIO_SLAVE_MASK 0x00FFffff /* 16MB */
|
|
|
|
#define DVMA_VME_SLAVE_BASE 0x0FF00000 /* 1MB */
|
|
#define DVMA_VME_SLAVE_MASK 0x000Fffff /* 1MB */
|
|
|
|
|
|
/* DVMA is the last 1MB, but the PROM gets the last page. */
|
|
#define DVMA_SPACE_START 0x0FF00000
|
|
#define DVMA_SPACE_END 0x0FFFE000
|
|
|
|
void dvma_init __P((void));
|
|
|
|
/* Allocate/free actual pages of DVMA space. */
|
|
void * dvma_malloc __P((size_t bytes));
|
|
void dvma_free(void *addr, size_t bytes);
|
|
|
|
/* Remap/unmap kernel memory in DVMA space. */
|
|
void * dvma_mapin __P((void *kva, int len, int canwait));
|
|
void dvma_mapout __P((void *dvma_addr, int len));
|
|
|
|
/* Convert a kernel DVMA pointer to a slave address. */
|
|
u_long dvma_kvtopa __P((void *kva, int bus));
|
|
|