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Return ANSI sequences for special keys

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This commit is contained in:
Michael Brown 2006-12-20 23:42:28 +00:00
parent f33a03c1e5
commit dbb7b30cca
1 changed files with 80 additions and 6 deletions
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86
src/arch/i386/firmware/pcbios/bios_console.c
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@ -176,20 +176,90 @@ static void bios_putchar ( int character ) {
: "ebp" );
}
/**
* Pointer to current ANSI output sequence
*
* While we are in the middle of returning an ANSI sequence for a
* special key, this will point to the next character to return. When
* not in the middle of such a sequence, this will point to a NUL
* (note: not "will be NULL").
*/
static const char *ansi_input = "";
/**
* Lowest BIOS scancode of interest
*
* Most of the BIOS key scancodes that we are interested in are in a
* dense range, so subtracting a constant and treating them as offsets
* into an array works efficiently.
*/
#define BIOS_KEY_MIN 0x47
/** Offset into list of interesting BIOS scancodes */
#define BIOS_KEY(scancode) ( (scancode) - BIOS_KEY_MIN )
/** Mapping from BIOS scan codes to ANSI escape sequences */
static const char *ansi_sequences[] = {
[ BIOS_KEY ( 0x47 ) ] = "[H", /* Home */
[ BIOS_KEY ( 0x48 ) ] = "[A", /* Up arrow */
[ BIOS_KEY ( 0x4b ) ] = "[D", /* Left arrow */
[ BIOS_KEY ( 0x4d ) ] = "[C", /* Right arrow */
[ BIOS_KEY ( 0x4f ) ] = "[F", /* End */
[ BIOS_KEY ( 0x50 ) ] = "[B", /* Down arrow */
[ BIOS_KEY ( 0x53 ) ] = "[3~", /* Delete */
};
/**
* Get ANSI escape sequence corresponding to BIOS scancode
*
* @v scancode BIOS scancode
* @ret ansi_seq ANSI escape sequence, if any, otherwise NULL
*/
static const char * scancode_to_ansi_seq ( unsigned int scancode ) {
unsigned int bios_key = BIOS_KEY ( scancode );
if ( bios_key < ( sizeof ( ansi_sequences ) /
sizeof ( ansi_sequences[0] ) ) ) {
return ansi_sequences[bios_key];
}
return NULL;
}
/**
* Get character from BIOS console
*
* @ret character Character read from console
*/
static int bios_getchar ( void ) {
uint8_t character;
uint16_t keypress;
unsigned int character;
char *ansi_seq;
/* If we are mid-sequence, pass out the next byte */
if ( ( character = *ansi_input ) ) {
ansi_input++;
return character;
}
/* Read character from real BIOS console */
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"int $0x16\n\t"
"cli\n\t" )
: "=a" ( character ) : "a" ( 0x0000 ) );
: "=a" ( keypress ) : "a" ( 0x1000 ) );
character = ( keypress & 0xff );
return character;
/* If it's a normal character, just return it */
if ( character )
return character;
/* Otherwise, check for a special key that we know about */
if ( ( ansi_seq = scancode_to_ansi_seq ( keypress >> 8 ) ) ) {
/* Start of escape sequence: return ESC (0x1b) */
ansi_input = ansi_seq;
return 0x1b;
}
return 0;
}
/**
@ -201,7 +271,12 @@ static int bios_getchar ( void ) {
static int bios_iskey ( void ) {
unsigned int discard_a;
unsigned int flags;
/* If we are mid-sequence, we are always ready */
if ( *ansi_input )
return 1;
/* Otherwise check the real BIOS console */
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"int $0x16\n\t"
"pushfw\n\t"
@ -209,7 +284,6 @@ static int bios_iskey ( void ) {
"cli\n\t" )
: "=r" ( flags ), "=a" ( discard_a )
: "a" ( 0x0100 ) );
return ( ! ( flags & ZF ) );
}