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[console] Avoid overlap between special keys and Unicode characters

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The special key range (from KEY_MIN upwards) currently overlaps with
the valid range for Unicode characters, and therefore prohibits the
use of Unicode key values outside the ASCII range.

Create space for Unicode key values by moving the special keys to the
range immediately above the maximum valid Unicode character.  This
allows the existing encoding of special keys as an efficiently packed
representation of the equivalent ANSI escape sequence to be maintained
almost as-is.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2023-07-04 14:31:07 +01:00
parent cc07ed7c7e
commit 3ef4f7e2ef
3 changed files with 77 additions and 31 deletions
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59
src/arch/x86/interface/pcbios/bios_console.c
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@@ -290,29 +290,38 @@ static const char *bios_ansi_input = "";
struct bios_key {
/** Scancode */
uint8_t scancode;
/** Key code */
uint16_t key;
/** Relative key value */
uint16_t rkey;
} __attribute__ (( packed ));
/**
* Define a BIOS key mapping
*
* @v scancode Scancode
* @v key iPXE key code
* @v bioskey BIOS key mapping
*/
#define BIOS_KEY( scancode, key ) { scancode, KEY_REL ( key ) }
/** Mapping from BIOS scan codes to iPXE key codes */
static const struct bios_key bios_keys[] = {
{ 0x53, KEY_DC },
{ 0x48, KEY_UP },
{ 0x50, KEY_DOWN },
{ 0x4b, KEY_LEFT },
{ 0x4d, KEY_RIGHT },
{ 0x47, KEY_HOME },
{ 0x4f, KEY_END },
{ 0x49, KEY_PPAGE },
{ 0x51, KEY_NPAGE },
{ 0x3f, KEY_F5 },
{ 0x40, KEY_F6 },
{ 0x41, KEY_F7 },
{ 0x42, KEY_F8 },
{ 0x43, KEY_F9 },
{ 0x44, KEY_F10 },
{ 0x85, KEY_F11 },
{ 0x86, KEY_F12 },
BIOS_KEY ( 0x53, KEY_DC ),
BIOS_KEY ( 0x48, KEY_UP ),
BIOS_KEY ( 0x50, KEY_DOWN ),
BIOS_KEY ( 0x4b, KEY_LEFT ),
BIOS_KEY ( 0x4d, KEY_RIGHT ),
BIOS_KEY ( 0x47, KEY_HOME ),
BIOS_KEY ( 0x4f, KEY_END ),
BIOS_KEY ( 0x49, KEY_PPAGE ),
BIOS_KEY ( 0x51, KEY_NPAGE ),
BIOS_KEY ( 0x3f, KEY_F5 ),
BIOS_KEY ( 0x40, KEY_F6 ),
BIOS_KEY ( 0x41, KEY_F7 ),
BIOS_KEY ( 0x42, KEY_F8 ),
BIOS_KEY ( 0x43, KEY_F9 ),
BIOS_KEY ( 0x44, KEY_F10 ),
BIOS_KEY ( 0x85, KEY_F11 ),
BIOS_KEY ( 0x86, KEY_F12 ),
};
/**
@@ -323,7 +332,7 @@ static const struct bios_key bios_keys[] = {
*/
static const char * bios_ansi_seq ( unsigned int scancode ) {
static char buf[ 5 /* "[" + two digits + terminator + NUL */ ];
unsigned int key;
unsigned int rkey;
unsigned int terminator;
unsigned int n;
unsigned int i;
@@ -338,9 +347,9 @@ static const char * bios_ansi_seq ( unsigned int scancode ) {
continue;
/* Construct escape sequence */
key = bios_keys[i].key;
n = KEY_ANSI_N ( key );
terminator = KEY_ANSI_TERMINATOR ( key );
rkey = bios_keys[i].rkey;
n = KEY_ANSI_N ( rkey );
terminator = KEY_ANSI_TERMINATOR ( rkey );
*(tmp++) = '[';
if ( n )
tmp += sprintf ( tmp, "%d", n );
@@ -479,6 +488,7 @@ struct console_driver bios_console __console_driver = {
static __asmcall __used void bios_inject ( struct i386_all_regs *ix86 ) {
unsigned int discard_a;
unsigned int scancode;
unsigned int rkey;
unsigned int i;
uint16_t keypress;
int key;
@@ -521,9 +531,10 @@ static __asmcall __used void bios_inject ( struct i386_all_regs *ix86 ) {
/* Handle special keys */
if ( key >= KEY_MIN ) {
rkey = KEY_REL ( key );
for ( i = 0 ; i < ( sizeof ( bios_keys ) /
sizeof ( bios_keys[0] ) ) ; i++ ) {
if ( bios_keys[i].key == key ) {
if ( bios_keys[i].rkey == rkey ) {
scancode = bios_keys[i].scancode;
keypress = ( scancode << 8 );
break;