57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/hl/i686/cpufunc.c
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* DESCRIPTION: Routines to provide access to special i686 CPU instructions
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include "xtkmapi.h"
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/**
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* Reads the data from the specified I/O port.
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*
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* @param Port
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* Specifies the port number in the range of 0-0xFFFF.
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*
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* @return The value read from the port.
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*
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* @since XT 1.0
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*/
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UCHAR
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XTAPI
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HlIoPortInByte(IN USHORT Port)
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{
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UCHAR Value;
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asm volatile("inb %1, %0"
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: "=a"(Value)
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: "Nd"(Port));
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return Value;
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}
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/**
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* Writes the data to the specified I/O port.
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*
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* @param Port
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* Specifies the port number in the range of 0-0xFFFF.
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*
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* @param Value
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* Supplies the value to write.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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VOID
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XTAPI
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HlIoPortOutByte(IN USHORT Port,
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IN UCHAR Value)
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{
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asm volatile("outb %0, %1"
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:
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:
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"a"(Value),
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"Nd"(Port));
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}
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