arch/powerpc/platforms/44x/misc_44x.S

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * This file contains miscellaneous low-level functions for PPC 44x.
   4  *    Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
   5  */
   6
   7 #include <asm/reg.h>
   8 #include <asm/ppc_asm.h>
   9
  10         .text
  11
  12 /*
  13  * Do an IO access in AS1
  14  */
  15 _GLOBAL(as1_readb)
  16         mfmsr   r7
  17         ori     r0,r7,MSR_DS
  18         sync
  19         mtmsr   r0
  20         sync
  21         isync
  22         lbz     r3,0(r3)
  23         sync
  24         mtmsr   r7
  25         sync
  26         isync
  27         blr
  28
  29 _GLOBAL(as1_writeb)
  30         mfmsr   r7
  31         ori     r0,r7,MSR_DS
  32         sync
  33         mtmsr   r0
  34         sync
  35         isync
  36         stb     r3,0(r4)
  37         sync
  38         mtmsr   r7
  39         sync
  40         isync
  41         blr