arch/powerpc/kernel/misc.S

   1 /*
   2  * This file contains miscellaneous low-level functions.
   3  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   4  *
   5  * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
   6  * and Paul Mackerras.
   7  *
   8  * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
   9  * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version
  14  * 2 of the License, or (at your option) any later version.
  15  */
  16 #include <asm/ppc_asm.h>
  17
  18         .text
  19
  20 #ifdef CONFIG_PPC64
  21 #define IN_SYNC         twi     0,r5,0; isync
  22 #define EIEIO_32
  23 #define SYNC_64         sync
  24 #else /* CONFIG_PPC32 */
  25 #define IN_SYNC
  26 #define EIEIO_32        eieio
  27 #define SYNC_64
  28 #endif
  29 /*
  30  * Returns (address we are running at) - (address we were linked at)
  31  * for use before the text and data are mapped to KERNELBASE.
  32  */
  33
  34 _GLOBAL(reloc_offset)
  35         mflr    r0
  36         bl      1f
  37 1:      mflr    r3
  38         LOAD_REG_IMMEDIATE(r4,1b)
  39         subf    r3,r4,r3
  40         mtlr    r0
  41         blr
  42
  43 /*
  44  * add_reloc_offset(x) returns x + reloc_offset().
  45  */
  46 _GLOBAL(add_reloc_offset)
  47         mflr    r0
  48         bl      1f
  49 1:      mflr    r5
  50         LOAD_REG_IMMEDIATE(r4,1b)
  51         subf    r5,r4,r5
  52         add     r3,r3,r5
  53         mtlr    r0
  54         blr
  55
  56 /*
  57  * I/O string operations
  58  *
  59  * insb(port, buf, len)
  60  * outsb(port, buf, len)
  61  * insw(port, buf, len)
  62  * outsw(port, buf, len)
  63  * insl(port, buf, len)
  64  * outsl(port, buf, len)
  65  * insw_ns(port, buf, len)
  66  * outsw_ns(port, buf, len)
  67  * insl_ns(port, buf, len)
  68  * outsl_ns(port, buf, len)
  69  *
  70  * The *_ns versions don't do byte-swapping.
  71  */
  72 _GLOBAL(_insb)
  73         cmpwi   0,r5,0
  74         mtctr   r5
  75         subi    r4,r4,1
  76         blelr-
  77 00:     lbz     r5,0(r3)
  78         eieio
  79         stbu    r5,1(r4)
  80         bdnz    00b
  81         IN_SYNC
  82         blr
  83
  84 _GLOBAL(_outsb)
  85         cmpwi   0,r5,0
  86         mtctr   r5
  87         subi    r4,r4,1
  88         blelr-
  89 00:     lbzu    r5,1(r4)
  90         stb     r5,0(r3)
  91         EIEIO_32
  92         bdnz    00b
  93         SYNC_64
  94         blr
  95
  96 _GLOBAL(_insw)
  97         cmpwi   0,r5,0
  98         mtctr   r5
  99         subi    r4,r4,2
 100         blelr-
 101 00:     lhbrx   r5,0,r3
 102         eieio
 103         sthu    r5,2(r4)
 104         bdnz    00b
 105         IN_SYNC
 106         blr
 107
 108 _GLOBAL(_outsw)
 109         cmpwi   0,r5,0
 110         mtctr   r5
 111         subi    r4,r4,2
 112         blelr-
 113 00:     lhzu    r5,2(r4)
 114         EIEIO_32
 115         sthbrx  r5,0,r3
 116         bdnz    00b
 117         SYNC_64
 118         blr
 119
 120 _GLOBAL(_insl)
 121         cmpwi   0,r5,0
 122         mtctr   r5
 123         subi    r4,r4,4
 124         blelr-
 125 00:     lwbrx   r5,0,r3
 126         eieio
 127         stwu    r5,4(r4)
 128         bdnz    00b
 129         IN_SYNC
 130         blr
 131
 132 _GLOBAL(_outsl)
 133         cmpwi   0,r5,0
 134         mtctr   r5
 135         subi    r4,r4,4
 136         blelr-
 137 00:     lwzu    r5,4(r4)
 138         stwbrx  r5,0,r3
 139         EIEIO_32
 140         bdnz    00b
 141         SYNC_64
 142         blr
 143
 144 #ifdef CONFIG_PPC32
 145 _GLOBAL(__ide_mm_insw)
 146 #endif
 147 _GLOBAL(_insw_ns)
 148         cmpwi   0,r5,0
 149         mtctr   r5
 150         subi    r4,r4,2
 151         blelr-
 152 00:     lhz     r5,0(r3)
 153         eieio
 154         sthu    r5,2(r4)
 155         bdnz    00b
 156         IN_SYNC
 157         blr
 158
 159 #ifdef CONFIG_PPC32
 160 _GLOBAL(__ide_mm_outsw)
 161 #endif
 162 _GLOBAL(_outsw_ns)
 163         cmpwi   0,r5,0
 164         mtctr   r5
 165         subi    r4,r4,2
 166         blelr-
 167 00:     lhzu    r5,2(r4)
 168         sth     r5,0(r3)
 169         EIEIO_32
 170         bdnz    00b
 171         SYNC_64
 172         blr
 173
 174 #ifdef CONFIG_PPC32
 175 _GLOBAL(__ide_mm_insl)
 176 #endif
 177 _GLOBAL(_insl_ns)
 178         cmpwi   0,r5,0
 179         mtctr   r5
 180         subi    r4,r4,4
 181         blelr-
 182 00:     lwz     r5,0(r3)
 183         eieio
 184         stwu    r5,4(r4)
 185         bdnz    00b
 186         IN_SYNC
 187         blr
 188
 189 #ifdef CONFIG_PPC32
 190 _GLOBAL(__ide_mm_outsl)
 191 #endif
 192 _GLOBAL(_outsl_ns)
 193         cmpwi   0,r5,0
 194         mtctr   r5
 195         subi    r4,r4,4
 196         blelr-
 197 00:     lwzu    r5,4(r4)
 198         stw     r5,0(r3)
 199         EIEIO_32
 200         bdnz    00b
 201         SYNC_64
 202         blr
 203