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Annotation of sys/arch/vax/boot/common/romread.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: romread.S,v 1.1 2002/06/11 09:36:23 hugh Exp $ */
        !             2: /*     $NetBSD: romread.S,v 1.1 2002/02/24 01:04:25 matt Exp $ */
        !             3: /*
        !             4:  * Copyright (c) 1995 Ludd, University of Lule}, Sweden.
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * This code is derived from software contributed to Ludd by
        !             8:  * Bertram Barth.
        !             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 at Ludd, University of
        !            21:  *      Lule}, Sweden and its contributors.
        !            22:  * 4. The name of the author may not be used to endorse or promote products
        !            23:  *    derived from this software without specific prior written permission
        !            24:  *
        !            25:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            26:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            27:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            28:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            29:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            30:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            31:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            32:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            33:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            34:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            35:  */
        !            36:
        !            37:  /* All bugs are subject to removal without further notice */
        !            38:
        !            39:
        !            40:
        !            41: #include "../include/asm.h"
        !            42:
        !            43: /*
        !            44:  * read750 (int block, int *regs)
        !            45:  */
        !            46: ENTRY(read750, 0xFFE)
        !            47:        movl    8(ap), r8
        !            48:        movl    4(r8), r1
        !            49:        movl    8(r8), r2
        !            50:        movl    12(r8), r3
        !            51:        movl    24(r8), r6
        !            52:        clrl    r5
        !            53:        movl    4(ap), r8
        !            54:        pushl   $0
        !            55:        movl    $0, 4(sp)
        !            56:        movl    fp, 0xf0000     # ragge ???
        !            57:        jsb     (r6)
        !            58:        movl    0xf0000, fp
        !            59:        ret
        !            60:
        !            61: /*
        !            62:  * romread_uvax (int lbn, int size, void *buf, struct rpb *rpb)
        !            63:  */
        !            64: ENTRY(romread_uvax, 0xFFE)
        !            65:        movl    16(ap),r11      # restore boot-contents of %r11 (rpb)
        !            66:        movl    52(r11), r7     # load iovec/bqo into %r7
        !            67:        addl3   (r7), r7, r6    # load qio into %r6
        !            68:        pushl   r11             # base of rpb
        !            69:        pushl   $0              # virtual-flag
        !            70:        pushl   $33             # read-logical-block
        !            71:        pushl   4(ap)           # lbn to start reading
        !            72:        pushl   8(ap)           # number of bytes to read
        !            73:        pushl   12(ap)          # buffer-address
        !            74:        calls   $6, (r6)        # call the qio-routine
        !            75:        ret                     # %r0 holds the result
        !            76:
        !            77: /*
        !            78:  * romwrite_uvax (int lbn, int size, void *buf, struct rpb *rpb)
        !            79:  */
        !            80: ENTRY(romwrite_uvax, 0xFFE)
        !            81:        movl    16(ap), r11     # restore boot-contents of %r11 (rpb)
        !            82:        movl    52(r11), r7     # load iovec/bqo into %r7
        !            83:        addl3   (r7), r7, r6    # load qio into %r6
        !            84:        pushl   r11             # base of rpb
        !            85:        pushl   $0              # virtual-flag
        !            86:        pushl   $32             # write-logical-block
        !            87:        pushl   4(ap)           # lbn to start reading
        !            88:        pushl   8(ap)           # number of bytes to read
        !            89:        pushl   12(ap)          # buffer-address
        !            90:        calls   $6, (r6)        # call the qio-routine
        !            91:        ret                     # %r0 holds the result
        !            92: