src/mesa/drivers/dri/common/mmio.h

   1 /*
   2  * (C) Copyright IBM Corporation 2004
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file mmio.h
  27  * Functions for properly handling memory mapped IO on various platforms.
  28  *
  29  * \author Ian Romanick <idr@us.ibm.com>
  30  */
  31
  32
  33 #ifndef MMIO_H
  34 #define MMIO_H
  35
  36 #if defined( __powerpc__ )
  37
  38 static __inline__ u_int32_t
  39 read_MMIO_LE32( volatile void * base, unsigned long offset )
  40 {
  41    volatile void * p = ((volatile char *) base) + offset;
  42    u_int32_t val;
  43
  44    __asm__ __volatile__( "lwbrx %0, %1, %2 ; eieio"
  45                          : "=r" (val)
  46                          : "b" (base), "r" (offset), "m" (p) );
  47    return val;
  48 }
  49
  50 #else
  51
  52 static __inline__ u_int32_t
  53 read_MMIO_LE32( volatile void * base, unsigned long offset )
  54 {
  55    volatile u_int32_t * p = (volatile u_int32_t *) (((volatile char *) base) + offset);
  56    return LE32_TO_CPU( p[0] );
  57 }
  58
  59 #endif
  60
  61 #endif /* MMIO_H */