/*      $NetBSD: locore.S,v 1.26 2021/02/26 02:18:57 thorpej Exp $      */
/*      $OpenBSD: locore.S,v 1.4 1997/01/26 09:06:38 rahnds 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_modular.h"
#include "opt_multiprocessor.h"
#include "opt_openpic.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 <powerpc/oea/hid.h>

#include "ksyms.h"

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

/*
 * Globals
 */
GLOBAL(startsym)
        .long   0                       /* start symbol table */
GLOBAL(endsym)
        .long   0                       /* end 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!
 */
        .text
        .globl  __start
__start:
        li      0,0
        mtmsr   0                       /* Disable FPU/MMU/exceptions */
        isync

        /* Enable data and instruction caches */
        mfspr   8,1008
        ori     8, 8, (HID0_ICE | HID0_DCE)@l
        mtspr   1008,8

/* compute end of kernel memory */
#if NKSYMS || defined(DDB) || defined(MODULAR)
        lis     7,_C_LABEL(startsym)@ha
        addi    7,7,_C_LABEL(startsym)@l
        stw     3,0(7)
        lis     7,_C_LABEL(endsym)@ha
        addi    7,7,_C_LABEL(endsym)@l
        stw     4,0(7)
#else
        lis     4,_C_LABEL(end)@ha
        addi    4,4,_C_LABEL(end)@l
#endif

        /* Make sure that .bss is zeroed. */
        li      0,0
        lis     8,edata@ha
        addi    8,8,edata@l
        lis     9,end@ha
        addi    9,9,end@l
5:      cmpw    0,8,9                   /* edata & end are >= word aligned */
        bge     6f
        stw     0,0(8)
        addi    8,8,4
        b       5b
6:

        INIT_CPUINFO(4,1,9,0)
        
        lis     3,__start@ha
        addi    3,3,__start@l

        /* 3 and 4 were updated here, 5 and 6 are passed intact */

        bl      _C_LABEL(initppc)
        bl      _C_LABEL(main)

loop:   b       loop                    /* not reached */

        .globl  _C_LABEL(jump_to_ppc_reset_entry)
_C_LABEL(jump_to_ppc_reset_entry):
        mfmsr   3
        ori     3,3,PSL_IP@l
        mtmsr   3
        isync
        ba      0xFFF00100

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

/*
 * Include common trap / exception code
 */
#include <powerpc/powerpc/trap_subr.S>

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