arch/powerpc/cpu/mpc824x/drivers/epic/epicutil.S

   1 /**************************************
   2  *
   3  * copyright @ Motorola, 1999
   4  *
   5  *
   6  * This file contains two commonly used
   7  * lower level utility routines.
   8  *
   9  * The utility routines are also in other
  10  * Kahlua device driver libraries. The
  11  * need to be linked in only once.
  12  **************************************/
  13
  14 #include <ppc_asm.tmpl>
  15 #include <ppc_defs.h>
  16
  17 /**********************************************************
  18  * function: load_runtime_reg
  19  *
  20  * input:  r3 - value of eumbbar
  21  *         r4 - register offset in embedded utility space
  22  *
  23  * output: r3 - register content
  24  **********************************************************/
  25       .text
  26       .align 2
  27       .global load_runtime_reg
  28
  29 load_runtime_reg:
  30
  31                   xor r5,r5,r5
  32           or  r5,r5,r3       /* save eumbbar */
  33
  34               lwbrx     r3,r4,r5
  35               sync
  36
  37               bclr 20, 0
  38
  39 /****************************************************************
  40  * function: store_runtime_reg
  41  *
  42  * input: r3 - value of eumbbar
  43  *        r4 - register offset in embedded utility space
  44  *        r5 - new value to be stored
  45  *
  46  ****************************************************************/
  47            .text
  48            .align 2
  49            .global store_runtime_reg
  50 store_runtime_reg:
  51
  52                   xor r0,r0,r0
  53
  54               stwbrx r5,  r4, r3
  55               sync
  56
  57                   bclr   20,0