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[console] Add facility for rudimentary keyboard mapping

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Allow for remapping of ASCII characters returned by the BIOS, using a
map consisting of (from,to) pairs.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2011-03-16 03:17:34 +00:00
parent b9326c3655
commit f98cf7d70f
2 changed files with 49 additions and 2 deletions
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21
src/arch/i386/firmware/pcbios/bios_console.c
View File

@ -22,6 +22,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <realmode.h>
#include <ipxe/console.h>
#include <ipxe/ansiesc.h>
#include <ipxe/keymap.h>
#define ATTR_BOLD 0x08
@ -228,6 +229,22 @@ static const char * scancode_to_ansi_seq ( unsigned int scancode ) {
return NULL;
}
/**
* Map a key
*
* @v character Character read from console
* @ret character Mapped character
*/
static int bios_keymap ( unsigned int character ) {
struct key_mapping *mapping;
for_each_table_entry ( mapping, KEYMAP ) {
if ( mapping->from == character )
return mapping->to;
}
return character;
}
/**
* Get character from BIOS console
*
@ -251,9 +268,9 @@ static int bios_getchar ( void ) {
: "=a" ( keypress ) : "a" ( 0x1000 ) );
character = ( keypress & 0xff );
/* If it's a normal character, just return it */
/* If it's a normal character, just map and return it */
if ( character && ( character < 0x80 ) )
return character;
return bios_keymap ( character );
/* Otherwise, check for a special key that we know about */
if ( ( ansi_seq = scancode_to_ansi_seq ( keypress >> 8 ) ) ) {

30
src/include/ipxe/keymap.h Normal file
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@ -0,0 +1,30 @@
#ifndef _IPXE_KEYMAP_H
#define _IPXE_KEYMAP_H
/**
* @file
*
* Keyboard mappings
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <ipxe/tables.h>
/** A keyboard mapping */
struct key_mapping {
/** Character read from keyboard */
uint8_t from;
/** Character to be used instead */
uint8_t to;
} __attribute__ (( packed ));
/** Keyboard mapping table */
#define KEYMAP __table ( struct key_mapping, "keymap" )
/** Define a keyboard mapping */
#define __keymap __table_entry ( KEYMAP, 01 )
#endif /* _IPXE_KEYMAP_H */