105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
#ifndef CONSOLE_H
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#define CONSOLE_H
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#include "stdint.h"
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#include "vsprintf.h"
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#include <gpxe/tables.h>
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/** @file
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*
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* User interaction.
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*
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* Various console devices can be selected via the build options
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* CONSOLE_FIRMWARE, CONSOLE_SERIAL etc. The console functions
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* putchar(), getchar() and iskey() delegate to the individual console
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* drivers.
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*
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*/
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/**
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* A console driver
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*
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* Defines the functions that implement a particular console type.
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* Must be made part of the console drivers table by using
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* #__console_driver.
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*
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* @note Consoles that cannot be used before their INIT_FN() has
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* completed should set #disabled=1 initially. This allows other
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* console devices to still be used to print out early debugging
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* messages.
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*
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*/
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struct console_driver {
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/** Console is disabled.
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*
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* The console's putchar(), getchar() and iskey() methods will
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* not be called while #disabled==1. Typically the
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* console's initialisation functions (called via INIT_FN())
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* will set #disabled=0 upon completion.
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*
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*/
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int disabled;
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/** Write a character to the console.
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*
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* @v character Character to be written
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* @ret None -
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* @err None -
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*
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*/
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void ( *putchar ) ( int character );
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/** Read a character from the console.
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*
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* @v None -
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* @ret character Character read
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* @err None -
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*
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* If no character is available to be read, this method will
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* block. The character read should not be echoed back to the
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* console.
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*
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*/
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int ( *getchar ) ( void );
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/** Check for available input.
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*
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* @v None -
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* @ret True Input is available
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* @ret False Input is not available
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* @err None -
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*
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* This should return True if a subsequent call to getchar()
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* will not block.
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*
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*/
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int ( *iskey ) ( void );
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};
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/**
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* Mark a <tt> struct console_driver </tt> as being part of the
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* console drivers table.
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*
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* Use as e.g.
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*
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* @code
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*
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* struct console_driver my_console __console_driver = {
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* .putchar = my_putchar,
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* .getchar = my_getchar,
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* .iskey = my_iskey,
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* };
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*
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* @endcode
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*
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*/
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#define __console_driver __table ( console, 01 )
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/* Function prototypes */
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extern void putchar ( int character );
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extern int getchar ( void );
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extern int iskey ( void );
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#endif /* CONSOLE_H */
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