/*
   * "Indirect" DCR access
   *
   * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
   *
   * 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.
   */
  
  #include <asm/ppc_asm.h>
  #include <asm/processor.h>
  #include <asm/bug.h>
  
  #define DCR_ACCESS_PROLOG(table) \
  	cmpli	cr0,r3,1024;	 \
  	rlwinm  r3,r3,4,18,27;   \
  	lis     r5,table@h;      \
  	ori     r5,r5,table@l;   \
  	add     r3,r3,r5;        \
  	bge-	1f;		 \
  	mtctr   r3;              \
  	bctr;			 \
  1:	trap;			 \
  	EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;	\
  	blr
  
  _GLOBAL(__mfdcr)
  	DCR_ACCESS_PROLOG(__mfdcr_table)
  
  _GLOBAL(__mtdcr)
  	DCR_ACCESS_PROLOG(__mtdcr_table)
  
  __mfdcr_table:
  	mfdcr  r3,0; blr
  __mtdcr_table:
  	mtdcr  0,r4; blr
  
  dcr     = 1
          .rept   1023
  	mfdcr   r3,dcr; blr
  	mtdcr   dcr,r4; blr
  	dcr     = dcr + 1
  	.endr