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Annotation of sys/arch/armish/stand/boot/start.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: start.S,v 1.1 2006/07/28 17:12:06 kettenis Exp $      */
        !             2: /*     $NetBSD: srtbegin.S,v 1.7 2005/12/11 12:17:10 christos Exp $    */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 2002 Wasabi Systems, Inc.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed for the NetBSD Project by
        !            21:  *     Wasabi Systems, Inc.
        !            22:  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
        !            23:  *    or promote products derived from this software without specific prior
        !            24:  *    written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        !            28:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            29:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
        !            30:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            31:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        !            32:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            33:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        !            34:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        !            35:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            36:  * POSSIBILITY OF SUCH DAMAGE.
        !            37:  */
        !            38:
        !            39: #include <machine/asm.h>
        !            40: #include <arm/armreg.h>
        !            41:
        !            42: #define        STACKSIZE       8192
        !            43:
        !            44: ENTRY(start)
        !            45:        /*
        !            46:         * We assume we've been loaded VA==PA, or that the MMU
        !            47:         * is disabled.  Make sure the MMU is disabled so that
        !            48:         * we don't have to care about the caches.
        !            49:         */
        !            50:        /* Clear the BSS. */
        !            51:        adr     r1, Lbss
        !            52:        ldmia   r1, {r1, r2}
        !            53:        sub     r2, r2, r1
        !            54:        mov     r3, #0
        !            55:
        !            56: 1:     strb    r3, [r1], #0x01
        !            57:        subs    r2, r2, #0x01
        !            58:        bgt     1b
        !            59:
        !            60:        /* Set the stack pointer */
        !            61:        adr     r1, Lstack
        !            62:        ldr     r1, [r1]
        !            63:        add     sp, r1, #STACKSIZE
        !            64:
        !            65:        b       _C_LABEL(main)
        !            66:
        !            67: Ltext:
        !            68:        .word   _C_LABEL(__text_store)
        !            69:        .word   _C_LABEL(start)
        !            70:        .word   _C_LABEL(_etext)
        !            71:
        !            72: Ldata:
        !            73:        .word   _C_LABEL(__data_store)
        !            74:        .word   _C_LABEL(__data_start)
        !            75:
        !            76: Lbss:
        !            77:        .word   _C_LABEL(_edata)
        !            78:        .word   _C_LABEL(_end)
        !            79:
        !            80: Lstack:
        !            81:        .word   Lstackspace
        !            82:
        !            83:        .comm   Lstackspace, STACKSIZE