include/ddk/ioaccess.h

   1 /*
   2  * ioaccess.h
   3  *
   4  * Windows Device Driver Kit
   5  *
   6  * This file is part of the w32api package.
   7  *
   8  * THIS SOFTWARE IS NOT COPYRIGHTED
   9  *
  10  * This source code is offered for use in the public domain. You may
  11  * use, modify or distribute it freely.
  12  *
  13  * This code is distributed in the hope that it will be useful but
  14  * WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
  15  * DISCLAIMED. This includes but is not limited to warranties of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  17  *
  18  */
  19 #ifndef __IOACCESS_H
  20 #define __IOACCESS_H
  21
  22 #ifdef __cplusplus
  23 extern "C" {
  24 #endif
  25
  26 #define H2I(p) PtrToUshort(p)
  27
  28 #ifndef NO_PORT_MACROS
  29
  30 #if defined(_X86_) || defined(_M_AMD64)
  31 #define READ_REGISTER_UCHAR(r) (*(volatile UCHAR *)(r))
  32 #define READ_REGISTER_USHORT(r) (*(volatile USHORT *)(r))
  33 #define READ_REGISTER_ULONG(r) (*(volatile ULONG *)(r))
  34 #define WRITE_REGISTER_UCHAR(r, v) (*(volatile UCHAR *)(r) = (v))
  35 #define WRITE_REGISTER_USHORT(r, v) (*(volatile USHORT *)(r) = (v))
  36 #define WRITE_REGISTER_ULONG(r, v) (*(volatile ULONG *)(r) = (v))
  37 #define READ_PORT_UCHAR(p) (UCHAR)(__inbyte (H2I(p)))
  38 #define READ_PORT_USHORT(p) (USHORT)(__inword (H2I(p)))
  39 #define READ_PORT_ULONG(p) (ULONG)(__indword (H2I(p)))
  40 #define WRITE_PORT_UCHAR(p, v) __outbyte (H2I(p), (v))
  41 #define WRITE_PORT_USHORT(p, v) __outword (H2I(p), (v))
  42 #define WRITE_PORT_ULONG(p, v) __outdword (H2I(p), (v))
  43
  44 #define MEMORY_BARRIER()
  45
  46 #elif defined(_PPC_) || defined(_MIPS_) || defined(_ARM_)
  47
  48 #define READ_REGISTER_UCHAR(r)      (*(volatile UCHAR * const)(r))
  49 #define READ_REGISTER_USHORT(r)     (*(volatile USHORT * const)(r))
  50 #define READ_REGISTER_ULONG(r)      (*(volatile ULONG * const)(r))
  51 #define WRITE_REGISTER_UCHAR(r, v)  (*(volatile UCHAR * const)(r) = (v))
  52 #define WRITE_REGISTER_USHORT(r, v) (*(volatile USHORT * const)(r) = (v))
  53 #define WRITE_REGISTER_ULONG(r, v)  (*(volatile ULONG * const)(r) = (v))
  54 #define READ_PORT_UCHAR(r)          READ_REGISTER_UCHAR(r)
  55 #define READ_PORT_USHORT(r)         READ_REGISTER_USHORT(r)
  56 #define READ_PORT_ULONG(r)          READ_REGISTER_ULONG(r)
  57 #define WRITE_PORT_UCHAR(p, v)      WRITE_REGISTER_UCHAR(p, (UCHAR) (v))
  58 #define WRITE_PORT_USHORT(p, v)     WRITE_REGISTER_USHORT(p, (USHORT) (v))
  59 #define WRITE_PORT_ULONG(p, v)      WRITE_REGISTER_ULONG(p, (ULONG) (v))
  60
  61 #else
  62
  63 #error Unsupported architecture
  64
  65 #endif
  66
  67 #endif /* NO_PORT_MACROS */
  68 #endif /* __IOACCESS_H */