in32(), inbe32(), inle32()

Read a 32-bit value from a port

Synopsis:

#include <hw/inout.h>

uint32_t in32( uintptr_t port );

#define inbe32 ( port ) ...

#define inle32 ( port ) ...

Library:

libc

Description:

The in32() function reads a 32-bit value from the specified port.

The inbe32() and inle32() macros read a 32-bit value that's in big-endian or little-endian format, respectively, from the specified port, and returns the value as native-endian.

Returns:

A 32-bit value in native-endian.

Classification:

QNX 6

Safety:
Cancellation point	No
Interrupt handler	Yes
Signal handler	Yes
Thread	Yes

Caveats:

The calling thread must have I/O privileges; see ThreadCtl()'s _NTO_TCTL_IO command for details.

The calling process must also use mmap_device_io() to access the device's I/O registers.

inbe32() and inle32() are implemented as macros.