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      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 
     69 #ifdef __cplusplus
     70 }
     71 #endif
     72 
     73 #endif /* __IOACCESS_H */
     74