/*      $NetBSD: locore_machdep.S,v 1.16 2011/02/20 07:56:31 matt Exp $ */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Digital Equipment Corporation, Ralph Campbell, Sony Corp and
 * Kazumasa Utashiro of Software Research Associates, Inc.
 *
 * 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. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 * Copyright (C) 1989 Digital Equipment Corporation.
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appears in all copies.
 * Digital Equipment Corporation makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/loMem.s,
 *      v 1.1 89/07/11 17:55:04 nelson Exp  SPRITE (DECWRL)
 * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/machAsm.s,
 *      v 9.2 90/01/29 18:00:39 shirriff Exp  SPRITE (DECWRL)
 * from: Header: /sprite/src/kernel/vm/ds3100.md/vmPmaxAsm.s,
 *      v 1.1 89/07/10 14:27:41 nelson Exp  SPRITE (DECWRL)
 *
 *      @(#)locore.s    8.5 (Berkeley) 1/4/94
 */


/*
 * NEWS-specific mips locore code.
 */

#include <mips/asm.h>
#include <mips/cpuregs.h>
#include <machine/machConst.h>
#include <machine/param.h>

#include "assym.h"

        .set    noreorder

LEAF(to_monitor)
        li      v0, MIPS_SR_BEV                 # no interrupt and
        mtc0    v0, MIPS_COP_0_STATUS           # boot strap exception vector
        nop
        nop
        nop
        nop
        li      a1, MACH_MONARG_ADDR|MIPS_KSEG1_START
        sw      a0, (a1)                        # pass argument(howto)
        move    a0, zero                        # syscall(#0)
        syscall
        nop
END(to_monitor)

#ifdef MIPS3
        .set    mips3
        .set    noat
        .globl  checkromwork
checkromwork:
        dmfc0   k0, MIPS_COP_0_BAD_VADDR

        li      k1, 0xfff00000                  # NEWS5000 ROM Work: 0xFFF00000~0xFFFFFFFF (1Mbyte)
        sltu    k1, k0, k1
        bne     k1, zero, outofworld
        nop

        li      k1, 0x000fe000                  # XXX (depend on 4k page)
        and     k1, k0, k1                      # k1 = (VADDR - 0xFFF00000) & 0xffffe000

        la      k0, _C_LABEL(physmem)
        lw      k0, 0(k0)                       # k0 = page of physmem (tail of maxmemory - 0x00100000)
        sll     k0, k0, PGSHIFT                 # k0 = memory tail
        add     k0, k0, k1                      # 0xfff00000+? -> memory tail + ?

        srl     k0, k0, 6                       # MIPS3_PG_SHIFT
        li      k1, 0x02|0x18|0x01              # MIPS3_PG_V|MIPS3_PG_CACHED|MIPS3_PG_G
        or      k0, k0, k1

        li      k1, 64                          # set ODD page
        add     k1, k0, k1

        dsll    k0, k0, 34                      # get rid of "wired" bit
        dsrl    k0, k0, 34
        dmtc0   k0, MIPS_COP_0_TLB_LO0          # load PTE entry
        dsll    k1, k1, 34
        dsrl    k1, k1, 34
        dmtc0   k1, MIPS_COP_0_TLB_LO1          # load PTE entry
        nop
        nop                                     # required for QED5230
        tlbwr                                   # write TLB
        nop
        nop
        nop
        nop
        nop
        eret

outofworld:
        /* Ensure we have a valid sp so panic has a chance */
        move    a1, sp
        la      sp, start                       # set sp to a valid place
        PANIC("TLB out of universe: ksp was %p")

        .set    at
#endif /* MIPS3 */

/*
 * Interrupt counters for vmstat.
 */
        .rdata
        .globl _C_LABEL(intrnames)
        .globl _C_LABEL(eintrnames)
_C_LABEL(intrnames):
        .asciiz "serial0"
        .asciiz "serial1"
        .asciiz "serial2"
        .asciiz "ether"
        .asciiz "scsi"
        .asciiz "memory"
        .asciiz "clock"
        .asciiz "fpu"
        .asciiz "slot1"
        .asciiz "slot2"
        .asciiz "slot3"
        .asciiz "floppy"
        .asciiz "stray"
        .asciiz "nmi"
        .asciiz "lostclock"
_C_LABEL(eintrnames):

        .data
        .globl _C_LABEL(intrcnt)
        .globl _C_LABEL(eintrcnt)
        .p2align 2
_C_LABEL(intrcnt):
        .word   0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0
_C_LABEL(eintrcnt):
        .word   0       # This shouldn't be needed but with 4.4bsd's as, the eintrcnt
                        #  label ends end up in a different section otherwise.