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#ifndef CONSOLE_H
#define CONSOLE_H
#include <gpxe/tables.h>
/** @file
*
* User interaction.
*
* Various console devices can be selected via the build options
* CONSOLE_FIRMWARE, CONSOLE_SERIAL etc. The console functions
* putchar(), getchar() and iskey() delegate to the individual console
* drivers.
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
/**
* A console driver
*
* Defines the functions that implement a particular console type.
* Must be made part of the console drivers table by using
* #__console_driver.
*
* @note Consoles that cannot be used before their initialisation
* function has completed should set #disabled=1 initially. This
* allows other console devices to still be used to print out early
* debugging messages.
*
*/
struct console_driver {
/** Console is disabled.
*
* The console's putchar(), putline(), getchar() and iskey()
* methods will not be called while #disabled==1. Typically
* the console's initialisation functions will set #disabled=0
* upon completion.
*
*/
int disabled;
/** Write a character to the console.
*
* @v character Character to be written
* @ret None -
* @err None -
*
*/
void ( *putchar ) ( int character );
/** Write an entire line to the console.
* This is intended to be used by line-oriented output media,
* like system logging facilities or line printers.
* Line output will not contain non-printable characters.
*
* @v linebuffer Pointer to the \0-terminated line
* @ret None -
* @err None -
*/
void ( * putline ) ( unsigned char * linebuffer );
/** Read a character from the console.
*
* @v None -
* @ret character Character read
* @err None -
*
* If no character is available to be read, this method will
* block. The character read should not be echoed back to the
* console.
*
*/
int ( *getchar ) ( void );
/** Check for available input.
*
* @v None -
* @ret True Input is available
* @ret False Input is not available
* @err None -
*
* This should return True if a subsequent call to getchar()
* will not block.
*
*/
int ( *iskey ) ( void );
};
/** Console driver table */
#define CONSOLES __table ( struct console_driver, "consoles" )
/**
* Mark a <tt> struct console_driver </tt> as being part of the
* console drivers table.
*
* Use as e.g.
*
* @code
*
* struct console_driver my_console __console_driver = {
* .putchar = my_putchar,
* .getchar = my_getchar,
* .iskey = my_iskey,
* };
*
* @endcode
*
*/
#define __console_driver __table_entry ( CONSOLES, 01 )
/* Function prototypes */
extern void putchar ( int character );
extern int getchar ( void );
extern int iskey ( void );
extern int getkey ( void );
#endif /* CONSOLE_H */
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