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Annotation of sys/arch/jornada/stand/boot/start.S, Revision 1.1.1.1

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