60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
// io.h
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// Author: Josh Holtrop
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// Created: 02/26/04
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// Implements basic port input/output functions
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#ifndef __HOS_IO__
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#define __HOS_IO__ __HOS_IO__
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#include "hos_defines.h"
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//void outportb(unsigned int port, unsigned char value);
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//inline void outportw(unsigned int port, unsigned int value);
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//inline unsigned char inportb(unsigned short port);
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//Writes a byte out to a port
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static inline void outportb(unsigned int port, unsigned int value) // Output a byte to a port
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{
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asm volatile ("outb %%al,%%dx"::"d" (port), "a" (value));
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}
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//Writes a word out to a port
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static inline void outportw(unsigned int port, unsigned int value) // Output a word to a port
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{
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asm volatile ("outw %%ax,%%dx"::"d" (port), "a" (value));
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}
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//Writes a dword out to a port
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static inline void outportd(unsigned int port, unsigned int value) // Output a word to a port
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{
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asm volatile ("outl %%eax,%%dx"::"d" (port), "a" (value));
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}
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//Reads a byte from a port
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static inline unsigned char inportb(unsigned int port)
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{
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unsigned char ret_val;
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asm volatile("inb %w1,%b0" : "=a"(ret_val) : "d"(port));
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return ret_val;
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}
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//Reads a word from a port
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static inline unsigned short inportw(unsigned int port)
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{
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unsigned int ret_val;
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asm volatile("inw %w1,%w0" : "=a"(ret_val) : "d"(port));
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return ret_val;
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}
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//Reads a dword from a port
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static inline unsigned int inportd(unsigned int port)
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{
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unsigned int ret_val;
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asm volatile("inl %w1,%0" : "=a"(ret_val) : "d"(port));
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return ret_val;
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}
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#endif
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