minix3/lib/libsys/arch/i386/sys_in.c

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2020-02-21 00:59:27 +05:30
#include "syslib.h"
/*===========================================================================*
* sys_in *
*===========================================================================*/
int sys_in(port, value, type)
int port; /* port address to read from */
u32_t *value; /* pointer where to store value */
int type; /* byte, word, long */
{
message m_io;
int result;
m_io.m_lsys_krn_sys_devio.request = _DIO_INPUT | type;
m_io.m_lsys_krn_sys_devio.port = port;
result = _kernel_call(SYS_DEVIO, &m_io);
*value = m_io.m_krn_lsys_sys_devio.value;
return(result);
}