473 lines
13 KiB
C
473 lines
13 KiB
C
/* $NetBSD: sun2.c,v 1.5 2002/09/27 15:36:58 provos Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Gordon W. Ross and Matthew Fredette.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Standalone functions specific to the Sun2.
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*/
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/* Need to avoid conflicts on these: */
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#define get_pte sun2_get_pte
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#define set_pte sun2_set_pte
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#define get_segmap sun2_get_segmap
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#define set_segmap sun2_set_segmap
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/*
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* We need to get the sun2 NBSG definition, even if we're
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* building this with a different sun68k target.
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*/
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#include <arch/sun2/include/param.h>
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#include <sys/param.h>
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#include <machine/idprom.h>
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#include <machine/mon.h>
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#include <arch/sun2/include/pte.h>
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#include <arch/sun2/sun2/control.h>
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#ifdef notyet
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#include <arch/sun3/sun3/vme.h>
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#else
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#define VME16_BASE MBIO_BASE
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#define VME16_MASK MBIO_MASK
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#endif
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#include <arch/sun2/sun2/mbmem.h>
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#include <arch/sun2/sun2/mbio.h>
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#include <stand.h>
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#include "libsa.h"
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#include "dvma.h"
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#include "saio.h" /* enum MAPTYPES */
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#define OBIO_MASK 0xFFFFFF
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u_int get_pte __P((vaddr_t va));
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void set_pte __P((vaddr_t va, u_int pte));
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char * dvma2_alloc __P((int len));
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void dvma2_free __P((char *dvma, int len));
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char * dvma2_mapin __P((char *pkt, int len));
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void dvma2_mapout __P((char *dmabuf, int len));
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char * dev2_mapin __P((int type, u_long addr, int len));
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struct mapinfo {
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int maptype;
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int pgtype;
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u_int base;
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u_int mask;
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};
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#ifdef notyet
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struct mapinfo
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sun2_mapinfo[MAP__NTYPES] = {
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/* On-board memory, I/O */
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{ MAP_MAINMEM, PGT_OBMEM, 0, ~0 },
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{ MAP_OBIO, PGT_OBIO, 0, OBIO_MASK },
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/* Multibus memory, I/O */
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{ MAP_MBMEM, PGT_MBMEM, MBMEM_BASE, MBMEM_MASK },
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{ MAP_MBIO, PGT_MBIO, MBIO_BASE, MBIO_MASK },
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/* VME A16 */
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{ MAP_VME16A16D, PGT_VME_D16, VME16_BASE, VME16_MASK },
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{ MAP_VME16A32D, 0, 0, 0 },
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/* VME A24 */
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{ MAP_VME24A16D, 0, 0, 0 },
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{ MAP_VME24A32D, 0, 0, 0 },
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/* VME A32 */
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{ MAP_VME32A16D, 0, 0, 0 },
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{ MAP_VME32A32D, 0, 0, 0 },
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};
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#endif
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/* The virtual address we will use for PROM device mappings. */
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int sun2_devmap = SUN3_MONSHORTSEG;
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char *
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dev2_mapin(maptype, physaddr, length)
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int maptype;
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u_long physaddr;
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int length;
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{
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#ifdef notyet
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u_int i, pa, pte, pgva, va;
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if ((sun2_devmap + length) > SUN3_MONSHORTPAGE)
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panic("dev2_mapin: length=%d", length);
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for (i = 0; i < MAP__NTYPES; i++)
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if (sun2_mapinfo[i].maptype == maptype)
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goto found;
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panic("dev2_mapin: bad maptype");
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found:
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if (physaddr & ~(sun2_mapinfo[i].mask))
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panic("dev2_mapin: bad address");
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pa = sun2_mapinfo[i].base += physaddr;
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pte = PA_PGNUM(pa) | PG_PERM |
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sun2_mapinfo[i].pgtype;
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va = pgva = sun2_devmap;
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do {
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set_pte(pgva, pte);
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pgva += NBPG;
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pte += 1;
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length -= NBPG;
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} while (length > 0);
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sun2_devmap = pgva;
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va += (physaddr & PGOFSET);
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#ifdef DEBUG_PROM
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if (debug)
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printf("dev2_mapin: va=0x%x pte=0x%x\n",
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va, get_pte(va));
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#endif
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return ((char*)va);
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#else
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panic("dev2_mapin");
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return(NULL);
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#endif
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}
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/*****************************************************************
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* DVMA support
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*/
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/*
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* The easiest way to deal with the need for DVMA mappings is to
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* create a DVMA alias mapping of the entire address range used by
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* the boot program. That way, dvma_mapin can just compute the
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* DVMA alias address, and dvma_mapout does nothing.
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*
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* Note that this assumes that standalone programs will do I/O
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* operations only within range (SA_MIN_VA .. SA_MAX_VA) checked.
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*/
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#define DVMA_BASE 0x00f00000
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#define DVMA_MAPLEN 0x38000 /* 256K - 32K (save MONSHORTSEG) */
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#define SA_MIN_VA 0x220000
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#define SA_MAX_VA (SA_MIN_VA + DVMA_MAPLEN)
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/* This points to the end of the free DVMA space. */
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u_int dvma2_end = DVMA_BASE + DVMA_MAPLEN;
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void
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dvma2_init()
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{
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int segva, dmava, sme;
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segva = SA_MIN_VA;
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dmava = DVMA_BASE;
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while (segva < SA_MAX_VA) {
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sme = get_segmap(segva);
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set_segmap(dmava, sme);
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segva += NBSG;
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dmava += NBSG;
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}
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}
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/* Convert a local address to a DVMA address. */
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char *
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dvma2_mapin(char *addr, int len)
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{
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int va = (int)addr;
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/* Make sure the address is in the DVMA map. */
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if ((va < SA_MIN_VA) || (va >= SA_MAX_VA))
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panic("dvma2_mapin: 0x%x outside 0x%x..0x%x",
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va, SA_MIN_VA, SA_MAX_VA);
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va -= SA_MIN_VA;
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va += DVMA_BASE;
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return ((char *) va);
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}
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/* Destroy a DVMA address alias. */
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void
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dvma2_mapout(char *addr, int len)
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{
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int va = (int)addr;
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/* Make sure the address is in the DVMA map. */
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if ((va < DVMA_BASE) || (va >= (DVMA_BASE + DVMA_MAPLEN)))
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panic("dvma2_mapout");
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}
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char *
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dvma2_alloc(int len)
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{
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len = m68k_round_page(len);
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dvma2_end -= len;
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return((char*)dvma2_end);
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}
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void
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dvma2_free(char *dvma, int len)
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{
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/* not worth the trouble */
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}
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/*****************************************************************
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* Control space stuff...
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*/
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u_int
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get_pte(va)
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vaddr_t va;
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{
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u_int pte;
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pte = get_control_word(CONTROL_ADDR_BUILD(PGMAP_BASE, va));
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if (pte & PG_VALID) {
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/*
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* This clears bit 30 (the kernel readable bit, which
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* should always be set), bit 28 (which should always
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* be set) and bit 26 (the user writable bit, which we
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* always have tracking the kernel writable bit). In
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* the protection, this leaves bit 29 (the kernel
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* writable bit) and bit 27 (the user readable bit).
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* See pte2.h for more about this hack.
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*/
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pte &= ~(0x54000000);
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/*
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* Flip bit 27 (the user readable bit) to become bit
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* 27 (the PG_SYSTEM bit).
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*/
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pte ^= (PG_SYSTEM);
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}
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return (pte);
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}
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void
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set_pte(va, pte)
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vaddr_t va;
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u_int pte;
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{
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if (pte & PG_VALID) {
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/* Clear bit 26 (the user writable bit). */
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pte &= (~0x04000000);
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/*
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* Flip bit 27 (the PG_SYSTEM bit) to become bit 27
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* (the user readable bit).
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*/
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pte ^= (PG_SYSTEM);
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/*
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* Always set bits 30 (the kernel readable bit) and
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* bit 28, and set bit 26 (the user writable bit) iff
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* bit 29 (the kernel writable bit) is set *and* bit
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* 27 (the user readable bit) is set. This latter bit
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* of logic is expressed in the bizarre second term
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* below, chosen because it needs no branches.
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*/
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#if (PG_WRITE >> 2) != PG_SYSTEM
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#error "PG_WRITE and PG_SYSTEM definitions don't match!"
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#endif
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pte |= 0x50000000
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| ((((pte & PG_WRITE) >> 2) & pte) >> 1);
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}
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set_control_word(CONTROL_ADDR_BUILD(PGMAP_BASE, va), pte);
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}
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int
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get_segmap(va)
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vaddr_t va;
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{
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va = CONTROL_ADDR_BUILD(SEGMAP_BASE, va);
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return (get_control_byte(va));
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}
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void
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set_segmap(va, sme)
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vaddr_t va;
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int sme;
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{
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va = CONTROL_ADDR_BUILD(SEGMAP_BASE, va);
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set_control_byte(va, sme);
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}
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/*
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* Copy the IDPROM contents into the passed buffer.
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* The caller (idprom.c) will do the checksum.
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*/
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void
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sun2_getidprom(u_char *dst)
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{
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vaddr_t src; /* control space address */
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int len, x;
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src = IDPROM_BASE;
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len = sizeof(struct idprom);
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do {
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x = get_control_byte(src);
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src += NBPG;
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*dst++ = x;
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} while (--len > 0);
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}
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/*****************************************************************
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* Init our function pointers, etc.
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*/
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/*
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* For booting, the PROM in fredette's Sun 2/120 doesn't map
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* much main memory, and what is mapped is mapped strangely.
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* Low virtual memory is mapped like:
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*
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* 0x000000 - 0x0bffff virtual -> 0x000000 - 0x0bffff physical
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* 0x0c0000 - 0x0fffff virtual -> invalid
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* 0x100000 - 0x13ffff virtual -> 0x0c0000 - 0x0fffff physical
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* 0x200800 - 0x3fffff virtual -> 0x200800 - 0x3fffff physical
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*
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* I think the SunOS authors wanted to load kernels starting at
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* physical zero, and assumed that kernels would be less
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* than 768K (0x0c0000) long. Also, the PROM maps physical
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* 0x0c0000 - 0x0fffff into DVMA space, so we can't take the
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* easy road and just add more mappings to use that physical
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* memory while loading (the PROM might do DMA there).
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*
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* What we do, then, is assume a 4MB machine (you'll really
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* need that to run NetBSD at all anyways), and we map two
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* chunks of physical and virtual space:
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*
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* 0x400000 - 0x4bffff virtual -> 0x000000 - 0x0bffff physical
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* 0x4c0000 - 0x600000 virtual -> 0x2c0000 - 0x3fffff physical
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*
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* And then we load starting at virtual 0x400000. We will do
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* all of this mapping just by copying PMEGs.
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*
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* After the load is done, but before we enter the kernel, we're
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* done with the PROM, so we copy the part of the kernel that
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* got loaded at physical 0x2c0000 down to physical 0x0c0000.
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* This can't just be a PMEG copy; we've actually got to move
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* bytes in physical memory.
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*
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* These two chunks of physical and virtual space are defined
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* in macros below. Some of the macros are only for completeness:
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*/
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#define MEM_CHUNK0_SIZE (0x0c0000)
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#define MEM_CHUNK0_LOAD_PHYS (0x000000)
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#define MEM_CHUNK0_LOAD_VIRT (0x400000)
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#define MEM_CHUNK0_LOAD_VIRT_PROM MEM_CHUNK0_LOAD_PHYS
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#define MEM_CHUNK0_COPY_PHYS MEM_CHUNK0_LOAD_PHYS
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#define MEM_CHUNK0_COPY_VIRT MEM_CHUNK0_COPY_PHYS
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#define MEM_CHUNK1_SIZE (0x140000)
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#define MEM_CHUNK1_LOAD_PHYS (0x2c0000)
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#define MEM_CHUNK1_LOAD_VIRT (MEM_CHUNK0_LOAD_VIRT + MEM_CHUNK0_SIZE)
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#define MEM_CHUNK1_LOAD_VIRT_PROM MEM_CHUNK1_LOAD_PHYS
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#define MEM_CHUNK1_COPY_PHYS (MEM_CHUNK0_LOAD_PHYS + MEM_CHUNK0_SIZE)
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#define MEM_CHUNK1_COPY_VIRT MEM_CHUNK1_COPY_PHYS
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/* Maps memory for loading. */
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u_long
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sun2_map_mem_load()
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{
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vaddr_t off;
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/* Map chunk zero for loading. */
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for(off = 0; off < MEM_CHUNK0_SIZE; off += NBSG)
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set_segmap(MEM_CHUNK0_LOAD_VIRT + off,
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get_segmap(MEM_CHUNK0_LOAD_VIRT_PROM + off));
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/* Map chunk one for loading. */
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for(off = 0; off < MEM_CHUNK1_SIZE; off += NBSG)
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set_segmap(MEM_CHUNK1_LOAD_VIRT + off,
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get_segmap(MEM_CHUNK1_LOAD_VIRT_PROM + off));
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/* Tell our caller where in virtual space to load. */
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return MEM_CHUNK0_LOAD_VIRT;
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}
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/* Remaps memory for running. */
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void *
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sun2_map_mem_run(entry)
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void *entry;
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{
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vaddr_t off, off_end;
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int sme;
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u_int pte;
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/* Chunk zero is already mapped and copied. */
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/* Chunk one needs to be mapped and copied. */
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pte = (get_pte(0) & ~PG_FRAME);
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for(off = 0; off < MEM_CHUNK1_SIZE; ) {
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/*
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* We use the PMEG immediately before the
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* segment we're copying in the PROM virtual
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* mapping of the chunk. If this is the first
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* segment, this is the PMEG the PROM used to
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* map 0x2b8000 virtual to 0x2b8000 physical,
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* which I'll assume is unused. For the second
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* and subsequent segments, this will be the
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* PMEG used to map the previous segment, which
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* is now (since we already copied it) unused.
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*/
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sme = get_segmap((MEM_CHUNK1_LOAD_VIRT_PROM + off) - NBSG);
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set_segmap(MEM_CHUNK1_COPY_VIRT + off, sme);
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/* Set the PTEs in this new PMEG. */
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for(off_end = off + NBSG; off < off_end; off += NBPG)
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set_pte(MEM_CHUNK1_COPY_VIRT + off,
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pte | PA_PGNUM(MEM_CHUNK1_COPY_PHYS + off));
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/* Copy this segment. */
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bcopy((caddr_t)(MEM_CHUNK1_LOAD_VIRT + (off - NBSG)),
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(caddr_t)(MEM_CHUNK1_COPY_VIRT + (off - NBSG)),
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NBSG);
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}
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/* Tell our caller where in virtual space to enter. */
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return ((caddr_t)entry) - MEM_CHUNK0_LOAD_VIRT;
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}
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void
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sun2_init()
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{
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/* Set the function pointers. */
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dev_mapin_p = dev2_mapin;
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dvma_alloc_p = dvma2_alloc;
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dvma_free_p = dvma2_free;
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dvma_mapin_p = dvma2_mapin;
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dvma_mapout_p = dvma2_mapout;
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/* Prepare DVMA segment. */
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dvma2_init();
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}
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