The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/nexus_io_asm.S

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    1 /*      $NetBSD: mainbus_io_asm.S,v 1.1 2001/02/24 19:38:02 reinoud Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 1997 Mark Brinicombe.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by Mark Brinicombe.
   18  * 4. The name of the company nor the name of the author may be used to
   19  *    endorse or promote products derived from this software without specific
   20  *    prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   25  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   26  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   27  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   28  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  */
   35 
   36 #include <machine/asm.h>
   37 __FBSDID("$FreeBSD: releng/6.0/sys/arm/arm/nexus_io_asm.S 139735 2005-01-05 21:58:49Z imp $");
   38 
   39 /*
   40  * bus_space I/O functions for nexus
   41  */
   42 
   43 
   44 /*
   45  * read single
   46  */
   47 
   48 ENTRY(nexus_bs_r_1)
   49         ldrb    r0, [r1, r2, lsl #2]
   50         RET
   51 
   52 ENTRY(nexus_bs_r_2)
   53         ldr     r0, [r1, r2, lsl #2]
   54         bic     r0, r0, #0xff000000
   55         bic     r0, r0, #0x00ff0000
   56         RET
   57 
   58 ENTRY(nexus_bs_r_4)
   59         ldr     r0, [r1, r2, lsl #2]
   60         RET
   61 
   62 /*
   63  * write single
   64  */
   65 
   66 ENTRY(nexus_bs_w_1)
   67         strb    r3, [r1, r2, lsl #2]
   68         RET
   69 
   70 ENTRY(nexus_bs_w_2)
   71         mov     r3, r3, lsl #16
   72         orr     r3, r3, r3, lsr #16
   73         str     r3, [r1, r2, lsl #2]
   74         RET
   75 
   76 ENTRY(nexus_bs_w_4)
   77         str     r3, [r1, r2, lsl #2]
   78         RET
   79 
   80 /*
   81  * read multiple
   82  */
   83 
   84 ENTRY(nexus_bs_rm_2)
   85         add     r0, r1, r2, lsl #2
   86         mov     r1, r3
   87         ldr     r2, [sp, #0]
   88         b       _C_LABEL(insw16)
   89 
   90 /*
   91  * write multiple
   92  */
   93 
   94 ENTRY(nexus_bs_wm_1)
   95         add     r0, r1, r2, lsl #2
   96         ldr     r2, [sp, #0]
   97 
   98         /* Make sure that we have a positive length */
   99         cmp     r2, #0x00000000
  100         movle   pc, lr
  101 
  102 nexus_wm_1_loop:
  103         ldrb    r1, [r3], #0x0001
  104         str     r1, [r0]
  105         subs    r2, r2, #0x00000001
  106         bgt     nexus_wm_1_loop
  107 
  108         RET
  109 
  110 ENTRY(nexus_bs_wm_2)
  111         add     r0, r1, r2, lsl #2
  112         mov     r1, r3
  113         ldr     r2, [sp, #0]
  114         b       _C_LABEL(outsw16)

Cache object: 426786d6eedd2e1558a3f46fc6a5aa8e


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