arch/ia64/sn/kernel/pio_phys.S

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
   7  *
   8  * This file contains macros used to access MMR registers via
   9  * uncached physical addresses.
  10  *      pio_phys_read_mmr  - read an MMR
  11  *      pio_phys_write_mmr - write an MMR
  12  *      pio_atomic_phys_write_mmrs - atomically write 1 or 2 MMRs with psr.ic=0
  13  *              Second MMR will be skipped if address is NULL
  14  *
  15  * Addresses passed to these routines should be uncached physical addresses
  16  *      ie., 0x80000....
  17  */
  18
  19
  20
  21 #include <asm/asmmacro.h>
  22 #include <asm/page.h>
  23
  24 GLOBAL_ENTRY(pio_phys_read_mmr)
  25         .prologue
  26         .regstk 1,0,0,0
  27         .body
  28         mov r2=psr
  29         rsm psr.i | psr.dt
  30         ;;
  31         srlz.d
  32         ld8.acq r8=[r32]
  33         ;;
  34         mov psr.l=r2;;
  35         srlz.d
  36         br.ret.sptk.many rp
  37 END(pio_phys_read_mmr)
  38
  39 GLOBAL_ENTRY(pio_phys_write_mmr)
  40         .prologue
  41         .regstk 2,0,0,0
  42         .body
  43         mov r2=psr
  44         rsm psr.i | psr.dt
  45         ;;
  46         srlz.d
  47         st8.rel [r32]=r33
  48         ;;
  49         mov psr.l=r2;;
  50         srlz.d
  51         br.ret.sptk.many rp
  52 END(pio_phys_write_mmr)
  53
  54 GLOBAL_ENTRY(pio_atomic_phys_write_mmrs)
  55         .prologue
  56         .regstk 4,0,0,0
  57         .body
  58         mov r2=psr
  59         cmp.ne p9,p0=r34,r0;
  60         rsm psr.i | psr.dt | psr.ic
  61         ;;
  62         srlz.d
  63         st8.rel [r32]=r33
  64 (p9)    st8.rel [r34]=r35
  65         ;;
  66         mov psr.l=r2;;
  67         srlz.d
  68         br.ret.sptk.many rp
  69 END(pio_atomic_phys_write_mmrs)
  70
  71