arch/powerpc/sysdev/dcr-low.S

   1 /*
   2  * "Indirect" DCR access
   3  *
   4  * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under  the terms of  the GNU General Public License as published by the
   8  * Free Software Foundation;  either version 2 of the License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #include <asm/ppc_asm.h>
  13 #include <asm/processor.h>
  14
  15 #define DCR_ACCESS_PROLOG(table) \
  16         rlwinm  r3,r3,4,18,27;   \
  17         lis     r5,table@h;      \
  18         ori     r5,r5,table@l;   \
  19         add     r3,r3,r5;        \
  20         mtctr   r3;              \
  21         bctr
  22
  23 _GLOBAL(__mfdcr)
  24         DCR_ACCESS_PROLOG(__mfdcr_table)
  25
  26 _GLOBAL(__mtdcr)
  27         DCR_ACCESS_PROLOG(__mtdcr_table)
  28
  29 __mfdcr_table:
  30         mfdcr  r3,0; blr
  31 __mtdcr_table:
  32         mtdcr  0,r4; blr
  33
  34 dcr     = 1
  35         .rept   1023
  36         mfdcr   r3,dcr; blr
  37         mtdcr   dcr,r4; blr
  38         dcr     = dcr + 1
  39         .endr