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# io.c

Go to the documentation of this file.

    00001 /*****************************************************************************************
    00002  Copyright (c) 2002-2005 The UbixOS Project
    00003  All rights reserved.
    00004
    00005  Redistribution and use in source and binary forms, with or without modification, are
    00006  permitted provided that the following conditions are met:
    00007
    00008  Redistributions of source code must retain the above copyright notice, this list of
    00009  conditions, the following disclaimer and the list of authors.  Redistributions in binary
    00010  form must reproduce the above copyright notice, this list of conditions, the following
    00011  disclaimer and the list of authors in the documentation and/or other materials provided
    00012  with the distribution. Neither the name of the UbixOS Project nor the names of its
    00013  contributors may be used to endorse or promote products derived from this software
    00014  without specific prior written permission.
    00015
    00016  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
    00017  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
    00018  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
    00019  THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    00020  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
    00021  OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    00022  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    00023  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    00024  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    00025
    00026  $Id: io_8c-source.html 88 2016-01-12 00:11:29Z reddawg $
    00027
    00028 *****************************************************************************************/
    00029
    00030 #include <sys/io.h>
    00031
    00039 unsigned char inportByte(unsigned int port) {
    00040   unsigned char retVal;
    00041   asm volatile(
    00042     "inb %%dx,%%al"
    00043     : "=a" (retVal)
    00044     : "d" (port)
    00045     );
    00046   return(retVal);
    00047   }
    00048
    00056 unsigned short inportWord(unsigned int port) {
    00057   unsigned short retVal;
    00058   asm volatile(
    00059     "inw %%dx,%%ax"
    00060     : "=a" (retVal)
    00061     : "d" (port)
    00062     );
    00063   return(retVal);
    00064   }
    00065
    00073 void outportByte(unsigned int port,unsigned char value) {
    00074   asm volatile(
    00075     "outb %%al,%%dx"
    00076     :
    00077     : "d" (port), "a" (value)
    00078     );
    00079   }
    00080
    00088 void outportByteP(unsigned int port,unsigned char value) {
    00089   asm volatile(
    00090     "outb %%al,%%dx\n"
    00091     "outb %%al,$0x80\n"
    00092     :
    00093     : "d" (port), "a" (value)
    00094     );
    00095   }
    00096
    00104 void outportWord(unsigned int port,unsigned short value) {
    00105   asm volatile(
    00106     "outw %%ax,%%dx"
    00107     :
    00108     : "d" (port), "a" (value)
    00109     );
    00110   }
    00111
    00119 void outportDWord(unsigned int port,unsigned long value) {
    00120   asm volatile(
    00121     "outl %%eax,%%dx"
    00122     :
    00123     : "d" (port), "a" (value)
    00124     );
    00125   }
    00126
    00134 unsigned long inportDWord(unsigned int port) {
    00135   unsigned long retVal;
    00136   asm volatile(
    00137     "inl %%dx,%%eax"
    00138     : "=a" (retVal)
    00139     : "d" (port)
    00140     );
    00141   return(retVal);
    00142   }
    00143
    00144 /***
    00145  END
    00146  ***/