64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/*
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* ports.c
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*
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* Created on: Aug 18, 2019
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* Author: rick
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*/
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#include "ports.h"
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/**
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* Read a byte from the specified port
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*/
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unsigned char port_byte_in(unsigned short port) {
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unsigned char result;
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__asm__("in %%dx, %%al" : "=a" (result) : "d" (port));
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return result;
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}
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void port_byte_out(unsigned short port, unsigned char data) {
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__asm__("out %%al, %%dx" : : "a" (data), "d" (port));
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}
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unsigned short port_word_in(unsigned short port) {
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unsigned short result;
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__asm__("in %%dx, %%ax" : "=a" (result) : "d" (port));
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return result;
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}
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void port_word_out(unsigned short port, unsigned short data) {
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__asm__("out %%ax, %%dx" : : "a" (data), "d" (port));
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}
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unsigned int port_double_word_in(unsigned int port) {
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unsigned int result;
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__asm__("in %%dx, %%eax" : "=a" (result) : "d" (port));
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return result;
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}
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void port_double_word_out(unsigned short port, unsigned int data) {
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__asm__("out %%eax, %%dx" : : "a" (data), "d" (port));
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}
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void port_word_out_repeat(unsigned short port, unsigned short *data, int buffer_size) {
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asm("rep outsw"
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: "+S"(data), "+c"(buffer_size)
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: "d"(port)
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: "memory");
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}
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void port_word_in_repeat(unsigned short port, unsigned short *data, int buffer_size) {
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asm("rep insw"
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: "+D"(data), "+c"(buffer_size)
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: "d"(port)
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: "memory");
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}
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void port_double_word_in_repeat(unsigned short port, unsigned int *data, int buffer_size) {
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asm("rep insl"
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: "+D"(data), "+c"(buffer_size)
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: "d"(port)
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: "memory");
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} |