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[console] Handle remapping of scancode 86

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The key with scancode 86 appears in the position between left shift
and Z on a US keyboard, where it typically fails to exist entirely.
Most US keyboard maps define this nonexistent key as generating "\|",
with the notable exception of "loadkeys" which instead reports it as
generating "<>".  Both of these mapping choices duplicate keys that
exist elsewhere in the map, which causes problems for our ASCII-based
remapping mechanism.

Work around these quirks by treating the key as generating "\|" with
the high bit set, and making it subject to remapping.  Where the BIOS
generates "\|" as expected, this allows us to remap to the correct
ASCII value.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2022-02-09 15:43:42 +00:00
parent 3f05a82fec
commit 0bbd896783
28 changed files with 93 additions and 6 deletions
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9
src/arch/x86/interface/pcbios/bios_console.c
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@@ -68,6 +68,13 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
*/
#define SCANCODE_RSHIFT 0x36
/** Scancode for the "non-US \ and |" key
*
* This is the key that appears between Left Shift and Z on non-US
* keyboards.
*/
#define SCANCODE_NON_US 0x56
/* Set default console usage if applicable */
#if ! ( defined ( CONSOLE_PCBIOS ) && CONSOLE_EXPLICIT ( CONSOLE_PCBIOS ) )
#undef CONSOLE_PCBIOS
@@ -383,6 +390,8 @@ static int bios_getchar ( void ) {
if ( character && ( character < 0x80 ) ) {
if ( scancode < SCANCODE_RSHIFT ) {
return key_remap ( character );
} else if ( scancode == SCANCODE_NON_US ) {
return key_remap ( character | KEYMAP_PSEUDO );
} else {
return character;
}