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hw_x86_64: Provide inb and outb functions for port I/O

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The port_io.h file provides the inb and outb functions to perform port
I/O operations.
This commit is contained in:
Reto Buerki 2015-03-06 10:56:46 +01:00 committed by Christian Helmuth
parent 1b3871a3f0
commit b75b1902f2
1 changed files with 27 additions and 0 deletions
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27
repos/base-hw/src/core/include/spec/x86/port_io.h Normal file
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#ifndef _PORT_IO_H_
#define _PORT_IO_H_
#include <base/stdint.h>
namespace Genode
{
/**
* Read byte from I/O port
*/
inline uint8_t inb(uint16_t port)
{
uint8_t res;
asm volatile ("inb %w1, %0" : "=a"(res) : "Nd"(port));
return res;
}
/**
* Write byte to I/O port
*/
inline void outb(uint16_t port, uint8_t val)
{
asm volatile ("outb %0, %w1" : : "a"(val), "Nd"(port));
}
}
#endif /* _PORT_IO_H_ */