arch/frv/lib/insl_sw.S

   1 /* insl_sw.S: input array of 4b words from device port with byte swapping
   2  *
   3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12
  13         .text
  14         .p2align        4
  15
  16 ###############################################################################
  17 #
  18 # void __insl_sw(unsigned int port, void *buf, int n)
  19 #
  20 ###############################################################################
  21         .globl          __insl_sw
  22         .type           __insl_sw,@function
  23 __insl_sw:
  24         subi.p          gr9,#1,gr9
  25         setlos          #1,gr4
  26 0:
  27         ldi.p           @(gr8,#0),gr5           ; get 0xAABBCCDD
  28         subicc          gr10,#1,gr10,icc0
  29
  30         stbu.p          gr5,@(gr9,gr4)          ; write 0xDD
  31         srli            gr5,#8,gr5
  32         stbu.p          gr5,@(gr9,gr4)          ; write 0xCC
  33         srli            gr5,#8,gr5
  34         stbu.p          gr5,@(gr9,gr4)          ; write 0xBB
  35         srli            gr5,#8,gr5
  36         stbu.p          gr5,@(gr9,gr4)          ; write 0xAA
  37         bhi             icc0,#2,0b
  38         bralr
  39
  40         .size           __insl_sw, .-__insl_sw