= GIET-VM / TTY0 access functions =

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The [source:soft/giet_vm/giet_common/utils.c utils.c] and [source:soft/giet_vm/giet_common/utils.h util.h] files define the functions used to access the kernel terminal TTY[0]. The ''_put*'' functions do not take the lock protecting exclusive access. The ''_printf'' function takes the lock protecting exclusive access.

They are prefixed by "_" to remind that they can only be executed by a processor in kernel mode.

 === void _puts( char* string ) ===
Displays a ''string'' on kernel TTY0. This function does NOT take the TTY0 lock.

 === void _putx( unsigned int value ) ===
Displays a 32 bits word as an hexadecimal string on kernel TTY0. This function does NOT take the TTY0 lock.

=== void _putl( unsigned long long value ) ===
Displays a 64 bits word as an hexadecimal string on kernel TTY0. This function does NOT take the TTY0 lock.

 === void _putd( unsigned int value ) ===
Displays a 32 bits word as an decimal string on kernel TTY0. This function does NOT take the TTY0 lock.

 === void _getc( char* byte ) ===
This blocking function uses a polling strategy on the TTY0 status register to get a single character.