1997-04-17 02:43:46 +04:00
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/* $NetBSD: ofwreal.S.old,v 1.2 1997/04/16 22:43:46 thorpej Exp $ */
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1996-09-30 20:34:14 +04:00
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/*
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* Copyright (C) 1996 Wolfgang Solfrank.
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* Copyright (C) 1996 TooLs GmbH.
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* All rights reserved.
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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 TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This file provides a real-mode client interface on machines, that
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* (incorrectly) only implement virtual mode client interface.
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*
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* It assumes though, that any actual memory in the machine is
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* mapped 1:1 even by the virtual mode OpenFirmware.
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* Furthermore it assumes that addresses returned by OpenFirmware are not
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* accessed by the client.
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*
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* TODO: handle set-callback specially
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*/
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#include <machine/psl.h>
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#include <machine/trap.h>
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1997-04-17 02:43:46 +04:00
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#include <machine/asm.h>
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1996-09-30 20:34:14 +04:00
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1997-04-17 02:43:46 +04:00
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#define CACHELINE 32 /* Note that this value is really
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hardwired */
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1996-09-30 20:34:14 +04:00
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.data
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1997-04-17 02:43:46 +04:00
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ofentry:
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.long 0 /* actual entry to firmware in
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virtual mode */
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1996-09-30 20:34:14 +04:00
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#define BATSIZE (8*8)
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#define SRSIZE (16*4)
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#define SPRGSIZE (4*4)
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#define SDR1SIZE 4
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#define SI1SIZE (2*256)
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#define SI2SIZE (3*256)
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#define SVSIZE (BATSIZE+SRSIZE+SPRGSIZE+SDR1SIZE+SI1SIZE+SI2SIZE)
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1997-04-17 02:43:46 +04:00
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.local fwsave
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.comm fwsave,SVSIZE,8
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1996-09-30 20:34:14 +04:00
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1997-04-17 02:43:46 +04:00
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.local clsave
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.comm clsave,SVSIZE,8
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ENTRY(ofwr_init)
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1996-09-30 20:34:14 +04:00
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mflr 31 /* save return address */
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mr 13,6 /* save args (only pointer used) */
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lis 8,ofentry@ha
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stw 5,ofentry@l(8) /* save virtual mode firmware entry */
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1997-04-17 02:43:46 +04:00
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lis 3,fwsave@ha /* save the mmu values of the
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firmware */
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1996-09-30 20:34:14 +04:00
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addi 3,3,fwsave@l
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bl savemmu
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lis 5,fwentry@ha /* get new firmware entry */
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addi 5,5,fwentry@l
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mr 6,13 /* restore args pointer */
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mtlr 31 /* restore return address */
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blr
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/*
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* Emulated firmware entry.
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*/
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fwentry:
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mflr 0 /* save return address */
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stw 0,4(1)
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stwu 1,-16(1) /* setup stack frame */
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stw 3,8(1) /* save arg */
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lis 3,clsave@ha /* save mmu values of client */
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addi 3,3,clsave@l
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bl savemmu
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lis 3,fwsave@ha /* restore mmu values of firmware */
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addi 3,3,fwsave@l
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bl restoremmu
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lis 3,ofentry@ha
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lwz 3,ofentry@l(3) /* get actual firmware entry */
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mtlr 3
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mfmsr 4
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ori 4,4,PSL_IR|PSL_DR /* turn on MMU */
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mtmsr 4
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isync
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lwz 3,8(1) /* restore arg */
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blrl /* do actual firmware call */
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stw 3,8(1) /* save return value */
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mfmsr 4
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1997-04-17 02:43:46 +04:00
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lis 3,(PSL_IR|PSL_DR)@h /* turn off MMU */
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ori 3,3,(PSL_IR|PSL_DR)@l
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andc 4,4,3
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1996-09-30 20:34:14 +04:00
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mtmsr 4
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isync
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lis 3,fwsave@ha /* save mmu values of firmare */
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addi 3,3,fwsave@l /* (might not be necessary, but... */
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bl savemmu
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lis 3,clsave@ha /* restore mmu values of client */
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addi 3,3,clsave@l
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bl restoremmu
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lwz 3,8(1) /* restore return value */
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lwz 1,0(1) /* and return */
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lwz 0,4(1)
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mtlr 0
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blr
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/*
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* Save everyting related to the mmu to the saveare pointed to by r3.
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*/
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savemmu:
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mfibatl 4,0 /* save BATs */
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stw 4,0(3)
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mfibatu 4,0
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stw 4,4(3)
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mfibatl 4,1
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stw 4,8(3)
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mfibatu 4,1
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stw 4,12(3)
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mfibatl 4,2
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stw 4,16(3)
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mfibatu 4,2
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stw 4,20(3)
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mfibatl 4,3
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stw 4,24(3)
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mfibatu 4,3
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stw 4,28(3)
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mfdbatl 4,0
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stw 4,32(3)
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mfdbatu 4,0
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stw 4,36(3)
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mfdbatl 4,1
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stw 4,40(3)
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mfdbatu 4,1
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stw 4,44(3)
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mfdbatl 4,2
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stw 4,48(3)
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mfdbatu 4,2
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stw 4,52(3)
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mfdbatl 4,3
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stw 4,56(3)
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mfdbatu 4,3
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stwu 4,60(3)
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li 4,0 /* save SRs */
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1:
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addis 4,4,-0x10000000@ha
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or. 4,4,4
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mfsrin 5,4
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stwu 5,4(3)
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bne 1b
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mfsprg 4,0 /* save SPRGs */
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stw 4,4(3)
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mfsprg 4,1
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stw 4,8(3)
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mfsprg 4,2
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stw 4,12(3)
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mfsprg 4,3
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stw 4,16(3)
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mfsdr1 4 /* save SDR1 */
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stw 4,20(3)
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addi 4,3,24
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mflr 11
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li 3,EXC_DSI /* save DSI/ISI trap vectors */
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li 5,SI1SIZE
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bl copy
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mtlr 11
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li 3,EXC_IMISS /* save MISS trap vectors */
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li 5,SI2SIZE
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copy:
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li 6,CACHELINE
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1:
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lwz 7,0(3)
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lwz 8,4(3)
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lwz 9,8(3)
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lwz 10,12(3)
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stw 7,0(4)
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stw 8,4(4)
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stw 9,8(4)
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stw 10,12(4)
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lwz 7,16(3)
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lwz 8,20(3)
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lwz 9,24(3)
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lwz 10,28(3)
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stw 7,16(4)
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stw 8,20(4)
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stw 9,24(4)
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stw 10,28(4)
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dcbst 0,4
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icbi 0,4
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add 3,3,6
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add 4,4,6
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subf. 5,6,5
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bgt 1b
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dcbst 0,4
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icbi 0,4
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sync
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isync
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blr
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/*
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* Restore everyting related to the mmu from the saveare pointed to by r3.
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*/
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restoremmu:
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li 4,0 /* first, invalidate BATs */
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mtibatu 0,4
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mtibatu 1,4
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mtibatu 2,4
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mtibatu 3,4
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mtdbatu 0,4
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mtdbatu 1,4
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mtdbatu 2,4
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mtdbatu 3,4
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lwz 4,0(3)
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mtibatl 0,4 /* restore BATs */
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lwz 4,4(3)
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mtibatu 0,4
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lwz 4,8(3)
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mtibatl 1,4
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lwz 4,12(3)
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mtibatu 1,4
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lwz 4,16(3)
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mtibatl 2,4
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lwz 4,20(3)
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mtibatu 2,4
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lwz 4,24(3)
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mtibatl 3,4
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lwz 4,28(3)
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mtibatu 3,4
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lwz 4,32(3)
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mtdbatl 0,4
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lwz 4,36(3)
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mtdbatu 0,4
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lwz 4,40(3)
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mtdbatl 1,4
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lwz 4,44(3)
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mtdbatu 1,4
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lwz 4,48(3)
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mtdbatl 2,4
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lwz 4,52(3)
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mtdbatu 2,4
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lwz 4,56(3)
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mtdbatl 3,4
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lwzu 4,60(3)
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mtdbatu 3,4
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li 4,0 /* restore SRs */
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1:
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lwzu 5,4(3)
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addis 4,4,-0x10000000@ha
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or. 4,4,4
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mtsrin 5,4
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bne 1b
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lwz 4,4(3)
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mtsprg 0,4 /* restore SPRGs */
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lwz 4,8(3)
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mtsprg 1,4
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lwz 4,12(3)
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mtsprg 2,4
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lwz 4,16(3)
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mtsprg 3,4
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sync /* remove everything from tlb */
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lis 4,0x40000@ha
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li 5,0x1000
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1:
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subf. 4,5,4
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tlbie 4
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bne 1b
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sync
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tlbsync
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sync
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lwz 4,20(3)
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sync
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mtsdr1 4 /* restore SDR1 */
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addi 3,3,24
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mflr 11
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li 4,EXC_DSI /* restore DSI/ISI trap vectors */
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li 5,SI1SIZE
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bl copy
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li 4,EXC_IMISS /* restore MISS trap vectors */
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li 5,SI2SIZE
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bl copy
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/* tlbia */
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sync
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li 3,0x40
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mtctr 3
|
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li 4,0
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1:
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tlbie 4
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addi 4,4,0x1000
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bdnz 1b
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sync
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tlbsync
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sync
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mtlr 11
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blr
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