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| /* $id$
* Low level I/O functions taken from led-stat.txt
* Jan 22 95 copyright damianf@wpi.edu
*
* DOS part (tested only with DOS version of GCC, DJGPP)
* by M.Prinke <m.prinke@trashcan.mcnet.de> 3/97
*
* FreeBSD support by Guillaume Filion and Philip Pokorny, copyright 05/2001
*
* NetBSD & OpenBSD port by Guillaume Filion, copyright 12/2001
*
* (Better) FreeBSD port by Guillaume Filion, copyright 05/2002
*
* Improved support for old Linux (glibc1 and libc5) by Guillaume Filion, 12/2002
*/
/*
This file defines 4 static inline functions for port I/O:
// Read a byte from port
static inline int port_in (unsigned short int port);
// Returns the content of the byte.
// Write a char(byte) 'val' to port.
static inline void port_out (unsigned short int port, unsigned char val);
// Returns nothing.
// Get access to a specific port
static inline int port_access (unsigned short int port);
// Returns 0 if successful, -1 if failed
// Get access 3 to ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
static inline int port_access_full (unsigned short int port);
// Returns 0 if successful, -1 if failed
*/
#ifndef PORT_H
#define PORT_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
// -------------------------------------------------------------
// Use ioperm, inb and outb in <sys/io.h> (Linux)
#if defined HAVE_IOPERM
/* Glibc2 and Glibc1 */
# ifdef HAVE_SYS_IO_H
# include <sys/io.h>
# endif
/* Libc5 */
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
// Read a byte from port
static inline int port_in (unsigned short int port) {
return inb(port);
}
// Write a byte 'val' to port
static inline void port_out (unsigned short int port, unsigned char val) {
outb(val, port);
}
// Get access to a specific port
static inline int port_access (unsigned short int port) {
return ioperm(port, 1, 255);
}
// Get access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
static inline int port_access_full (unsigned short int port) {
return ioperm(port, 3, 255);
}
// -------------------------------------------------------------
// Use i386_get_ioperm, i386_set_ioperm, inb and outb from <machine/pio.h> (NetBSD&OpenBSD)
#elif defined HAVE_I386_IOPERM_NETBSD && defined HAVE_MACHINE_PIO_H && defined HAVE_MACHINE_SYSARCH_H && defined HAVE_SYS_TYPES_H
#include <sys/types.h>
#include <machine/pio.h>
#include <machine/sysarch.h>
// Read a byte from port
static inline int port_in (unsigned short int port) {
return inb(port);
}
// Write a byte 'val' to port
static inline void port_out (unsigned short int port, unsigned char val) {
outb(port, val);
}
static inline void setaccess(u_long * map, u_int bit, int allow) {
u_int word;
u_int shift;
u_long mask;
word = bit / 32;
shift = bit - (word * 32);
mask = 0x000000001 << shift;
if (allow)
map[word] &= ~mask;
else
map[word] |= mask;
}
// Get access to a specific port
static inline int port_access (unsigned short int port) {
u_long iomap[32];
if (i386_get_ioperm(iomap) == -1) return -1;
setaccess(iomap, port , 1);
if (i386_set_ioperm(iomap) == -1) return -1;
return 0;
}
// Get access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
static inline int port_access_full (unsigned short int port) {
u_long iomap[32];
if (i386_get_ioperm(iomap) == -1) return -1;
setaccess(iomap, port , 1);
setaccess(iomap, port+1, 1);
setaccess(iomap, port+2, 1);
if (i386_set_ioperm(iomap) == -1) return -1;
return 0;
}
//#endif // defined HAVE_I386_IOPERM_NETBSD && defined HAVE_MACHINE_PIO_H && defined HAVE_MACHINE_SYSARCH_H
// -------------------------------------------------------------
// Use i386_get_ioperm, i386_set_ioperm from <machine/sysarch.h> and inb and outb from <machine/cpufunc.h> (FreeBSD)
#elif defined HAVE_I386_IOPERM_FREEBSD && defined HAVE_MACHINE_CPUFUNC_H && defined HAVE_MACHINE_SYSARCH_H && defined HAVE_SYS_TYPES_H
#include <sys/types.h>
#include <machine/cpufunc.h>
#include <machine/sysarch.h>
// Read a byte from port
static inline int port_in (unsigned short int port) {
return inb(port);
}
// Write a byte 'val' to port
static inline void port_out (unsigned short int port, unsigned char val) {
outb(port,val);
}
// Get access to a specific port
static inline int port_access (unsigned short int port) {
return i386_set_ioperm(port, 1, 1);
}
// Get access 3 to ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
static inline int port_access_full (unsigned short int port) {
return i386_set_ioperm(port, 3, 1);
}
//#endif // defined HAVE_I386_IOPERM_FREEBSD && defined HAVE_MACHINE_SYSARCH_H
// -------------------------------------------------------------
// Last chance! Use /dev/io and i386 ASM code (BSD4.3 ?)
#else
// Read a byte from port
static inline int port_in (unsigned short int port) {
unsigned char value;
__asm__ volatile ("inb %1,%0":"=a" (value)
:"d" ((unsigned short) port));
return value;
}
// Write a byte 'val' to port
static inline void port_out (unsigned short int port, unsigned char val) {
__asm__ volatile ("outb %0,%1\n"::"a" (val), "d" (port)
);
}
// Get access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
static inline int port_access_full (unsigned short int port) {
static FILE * port_access_handle = NULL ;
if( port_access_handle
|| (port_access_handle = fopen("/dev/io", "rw")) != NULL ) {
return( 0 ); // Success
} else {
return( -1 ); // Failure
};
return -1;
}
// Get access to a specific port
static inline int port_access (unsigned short int port) {
return port_access_full(port); // /dev/io gives you access to all ports.
}
#endif
/*
#else
#include <pc.h>
static inline int
port_in (int port)
{
unsigned char value;
value = inportb ((unsigned short) port);
return (int) value;
}
static inline void
port_out (unsigned int port, unsigned char val)
{
outportb ((unsigned short) port, val);
}
#endif
*/
#endif // PORT_H |
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