/*      $NetBSD: locore.S,v 1.52 2021/02/26 02:18:56 thorpej Exp $      */

/*
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * All rights reserved.
 *
 * 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 TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 */

#include "opt_ddb.h"
#include "opt_lockdebug.h"
#include "opt_modular.h"
#include "opt_multiprocessor.h"
#include "opt_ppcparam.h"
#include "assym.h"

#include <sys/syscall.h>

#include <machine/param.h>
#include <machine/psl.h>
#include <machine/trap.h>
#include <machine/asm.h>

#include <powerpc/spr.h>
#include <powerpc/oea/spr.h>

#include "ksyms.h"

/*
 * Some instructions gas doesn't understand (yet?)
 */
#define bdneq   bdnzf 2,

/*
 * Globals
 */
        .data
GLOBAL(esym)
        .long   0                       /* end of symbol table */

/*
 * This symbol is here for the benefit of kvm_mkdb, and is supposed to
 * mark the start of kernel text.
 */
        .text
        .globl  _C_LABEL(kernel_text)
_C_LABEL(kernel_text):

/*
 * Startup entry.  Note, this must be the first thing in the text
 * segment!
 *
 * Register state as transfer is passed from OpenFirmware / boot loader:
 *
 *      %r1     Stack provided by OpenFirmware / boot loader
 *      %r3     Reserved for platform binding (unused here)
 *      %r4     Reserved for platform binding (unused here)
 *      %r5     OpenFirmware client entry point
 *      %r6     Arguments
 *      %r7     Arguments length
 */
        .text
        .globl  __start
__start:
        /* Save off arguments that we need preserved. */
        mr      %r13,%r6
        mr      %r14,%r7

        bl      _C_LABEL(ofwinit)       /* init OF */

        li      %r0,0
        mtmsr   %r0                     /* Disable FPU/MMU/exceptions */

        bl      _C_LABEL(cpu_model_init)
        lis     %r12,oeacpufeat@ha
        lwz     %r12,oeacpufeat@l(%r12)
        andi.   %r12,%r12,OEACPU_64_BRIDGE      /* Compare against OEACPU_64_BRIDGE */
        beq     2f                      /* skip if this is a 32bit part */
        li      %r0,0
        sync
        slbia                           /* invalidate the slb table */
        sync
        clrldi  %r0,%r0,32              /* clear SF/ISF (high order bits) */
        mtmsrd  %r0
        mtspr   0x118,0         /* clear ASR[V] to enable segregs */
2:
        isync
        /* compute end of kernel memory */
        lis     %r4,_C_LABEL(end)@ha
        addi    %r4,%r4,_C_LABEL(end)@l
#if NKSYMS || defined(DDB) || defined(MODULAR)
        /* skip symbol table */
        mr      %r6,%r13
        mr      %r7,%r14
        cmpwi   %r6,0
        beq     1f
        add     %r9,%r6,%r7                     /* r9 = args + l */
        lwz     %r9,-8(%r9)                     /* esym */
        cmpwi   %r9,0
        beq     1f
        mr      %r4,%r9
1:
#endif


        /*
         * Initialize cpu_info[0]
         */
        INIT_CPUINFO(%r4,%r1,%r9,%r0)

        lis     %r3,__start@ha
        addi    %r3,%r3,__start@l
        mr      %r5,%r6                 /* args string */
        bl      _C_LABEL(initppc)
        bl      _C_LABEL(main)
        b       _C_LABEL(OF_exit)

/*
 * Pull in common OFW code.
 */
#include <powerpc/oea/ofw_subr.S>

/*
 * Pull in common switch / setfault code.
 */
#include <powerpc/powerpc/locore_subr.S>

/*
 * Pull in common trap vector code.
 */
#include <powerpc/powerpc/trap_subr.S>

/*
 * Pull in common pio / bus_space code.
 */
#include <powerpc/powerpc/pio_subr.S>