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[console] Allow console input and output to be disabled independently

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2013-11-28 05:41:45 +00:00
parent 7271b50890
commit b2251743d8
8 changed files with 64 additions and 65 deletions
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77
src/include/ipxe/console.h
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@@ -1,6 +1,7 @@
#ifndef _IPXE_CONSOLE_H
#define _IPXE_CONSOLE_H
#include <stddef.h>
#include <stdio.h>
#include <ipxe/tables.h>
@@ -17,6 +18,20 @@
FILE_LICENCE ( GPL2_OR_LATER );
struct pixel_buffer;
/** A console configuration */
struct console_configuration {
/** Width */
unsigned int width;
/** Height */
unsigned int height;
/** Colour depth */
unsigned int bpp;
/** Background picture, if any */
struct pixel_buffer *pixbuf;
};
/**
* A console driver
*
@@ -25,58 +40,45 @@ FILE_LICENCE ( GPL2_OR_LATER );
* #__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.
*
* function has completed should set #disabled 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(), getchar() and iskey() methods will
* not be called while #disabled==1. Typically the console's
* initialisation functions will set #disabled=0 upon
* completion.
/**
* Console disabled flags
*
* This is the bitwise OR of zero or more console disabled
* flags.
*/
int disabled;
/** Write a character to the console.
/**
* Write a character to the console
*
* @v character Character to be written
* @ret None -
* @err None -
*
*/
void ( *putchar ) ( int character );
/** Read a character from the console.
void ( * putchar ) ( int character );
/**
* 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.
int ( * getchar ) ( void );
/**
* Check for available input
*
* @v None -
* @ret True Input is available
* @ret False Input is not available
* @err None -
* @ret is_available Input is available
*
* This should return True if a subsequent call to getchar()
* This should return true if a subsequent call to getchar()
* will not block.
*
*/
int ( *iskey ) ( void );
/** Console usage bitmask
int ( * iskey ) ( void );
/**
* Console usage bitmask
*
* This is the bitwise OR of zero or more @c CONSOLE_USAGE_XXX
* values.
@@ -84,6 +86,15 @@ struct console_driver {
int usage;
};
/** Console is disabled for input */
#define CONSOLE_DISABLED_INPUT 0x0001
/** Console is disabled for output */
#define CONSOLE_DISABLED_OUTPUT 0x0002
/** Console is disabled for all uses */
#define CONSOLE_DISABLED ( CONSOLE_DISABLED_INPUT | CONSOLE_DISABLED_OUTPUT )
/** Console driver table */
#define CONSOLES __table ( struct console_driver, "consoles" )