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  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. #include "main/glheader.h"
  37.  
  38. #if defined( __powerpc__ )
  39.  
  40. static INLINE uint32_t
  41. read_MMIO_LE32( volatile void * base, unsigned long offset )
  42. {
  43.    uint32_t val;
  44.  
  45.    __asm__ __volatile__( "lwbrx %0, %1, %2 ; eieio"
  46.                          : "=r" (val)
  47.                          : "b" (base), "r" (offset) );
  48.    return val;
  49. }
  50.  
  51. #else
  52.  
  53. static INLINE uint32_t
  54. read_MMIO_LE32( volatile void * base, unsigned long offset )
  55. {
  56.    volatile uint32_t * p = (volatile uint32_t *) (((volatile char *) base) + offset);
  57.    return LE32_TO_CPU( p[0] );
  58. }
  59.  
  60. #endif
  61.  
  62. #endif /* MMIO_H */
  63.