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Annotation of sys/arch/arm/mainbus/mainbus_io_asm.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: mainbus_io_asm.S,v 1.1 2004/02/01 05:09:49 drahn Exp $        */
        !             2: /*     $NetBSD: mainbus_io_asm.S,v 1.1 2001/02/24 19:38:02 reinoud Exp $       */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1997 Mark Brinicombe.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by Mark Brinicombe.
        !            19:  * 4. The name of the company nor the name of the author may be used to
        !            20:  *    endorse or promote products derived from this software without specific
        !            21:  *    prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
        !            24:  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
        !            25:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            26:  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
        !            27:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        !            28:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            29:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            33:  * SUCH DAMAGE.
        !            34:  */
        !            35:
        !            36: #include <machine/asm.h>
        !            37:
        !            38: /*
        !            39:  * bus_space I/O functions for mainbus
        !            40:  */
        !            41:
        !            42:
        !            43: /*
        !            44:  * read single
        !            45:  */
        !            46:
        !            47: ENTRY(mainbus_bs_r_1)
        !            48:        ldrb    r0, [r1, r2, lsl #2]
        !            49:        mov     pc, lr
        !            50:
        !            51: ENTRY(mainbus_bs_r_2)
        !            52:        ldr     r0, [r1, r2, lsl #2]
        !            53:        bic     r0, r0, #0xff000000
        !            54:        bic     r0, r0, #0x00ff0000
        !            55:        mov     pc, lr
        !            56:
        !            57: ENTRY(mainbus_bs_r_4)
        !            58:        ldr     r0, [r1, r2, lsl #2]
        !            59:        mov     pc, lr
        !            60:
        !            61: /*
        !            62:  * write single
        !            63:  */
        !            64:
        !            65: ENTRY(mainbus_bs_w_1)
        !            66:        strb    r3, [r1, r2, lsl #2]
        !            67:        mov     pc, lr
        !            68:
        !            69: ENTRY(mainbus_bs_w_2)
        !            70:        mov     r3, r3, lsl #16
        !            71:        orr     r3, r3, r3, lsr #16
        !            72:        str     r3, [r1, r2, lsl #2]
        !            73:        mov     pc, lr
        !            74:
        !            75: ENTRY(mainbus_bs_w_4)
        !            76:        str     r3, [r1, r2, lsl #2]
        !            77:        mov     pc, lr
        !            78:
        !            79: /*
        !            80:  * read multiple
        !            81:  */
        !            82:
        !            83: ENTRY(mainbus_bs_rm_2)
        !            84:        add     r0, r1, r2, lsl #2
        !            85:        mov     r1, r3
        !            86:        ldr     r2, [sp, #0]
        !            87:        b       _C_LABEL(insw16)
        !            88:
        !            89: /*
        !            90:  * write multiple
        !            91:  */
        !            92:
        !            93: ENTRY(mainbus_bs_wm_1)
        !            94:        add     r0, r1, r2, lsl #2
        !            95:        ldr     r2, [sp, #0]
        !            96:
        !            97:        /* Make sure that we have a positive length */
        !            98:        cmp     r2, #0x00000000
        !            99:        movle   pc, lr
        !           100:
        !           101: mainbus_wm_1_loop:
        !           102:        ldrb    r1, [r3], #0x0001
        !           103:        str     r1, [r0]
        !           104:        subs    r2, r2, #0x00000001
        !           105:        bgt     mainbus_wm_1_loop
        !           106:
        !           107:        mov     pc, lr
        !           108:
        !           109: ENTRY(mainbus_bs_wm_2)
        !           110:        add     r0, r1, r2, lsl #2
        !           111:        mov     r1, r3
        !           112:        ldr     r2, [sp, #0]
        !           113:        b       _C_LABEL(outsw16)