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kernel/linux-rt-4.4.41/arch/frv/lib/insl_sw.S 1.11 KB
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  /* insl_sw.S: input array of 4b words from device port with byte swapping
   *
   * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version
   * 2 of the License, or (at your option) any later version.
   */
  
  
          .text
          .p2align	4
  
  ###############################################################################
  #
  # void __insl_sw(unsigned int port, void *buf, int n)
  #
  ###############################################################################
          .globl		__insl_sw
          .type		__insl_sw,@function
  __insl_sw:
  	subi.p		gr9,#1,gr9
  	setlos		#1,gr4
  0:
  	ldi.p		@(gr8,#0),gr5		; get 0xAABBCCDD
  	subicc		gr10,#1,gr10,icc0
  
  	stbu.p		gr5,@(gr9,gr4)		; write 0xDD
  	srli		gr5,#8,gr5
  	stbu.p		gr5,@(gr9,gr4)		; write 0xCC
  	srli		gr5,#8,gr5
  	stbu.p		gr5,@(gr9,gr4)		; write 0xBB
  	srli		gr5,#8,gr5
  	stbu.p		gr5,@(gr9,gr4)		; write 0xAA
  	bhi		icc0,#2,0b
  	bralr
  
  	.size		__insl_sw, .-__insl_sw