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KDGETLED Get state of LEDs. argp points to a long int. The lower three bits of *argp are set to the state of the LEDs, as follows:
LED_CAP     0x04     caps lock LED
LEC_NUM     0x02     num lock LED
LED_SCR     0x01     scroll lock LED
KDSETLED Set the LEDs. The LEDs are set to correspond to the lower three bits of argp. However, if a higher order bit is set, the LEDs revert to normal, displaying the state of the keyboard functions of caps lock, num lock, and scroll lock.

Before 1.1.54, the LEDs just reflected the state of the corresponding keyboard flags, and KDGETLED/KDSETLED would also change the keyboard flags. Since 1.1.54 the LEDs can be made to display arbitrary information, but by default they display the keyboard flags. The following two ioctls are used to access the keyboard flags.
KDGKBLED Get keyboard flags CapsLock, NumLock, ScrollLock (not lights). argp points to a char that is set to the flag state. The low order three bits (mask 0x7) get the current flag state, and the low order bits of the next nibble (mask 0x70) get the default flag state (since 1.1.54).
KDSKBLED Set keyboard flags CapsLock, NumLock, ScrollLock (not lights). argp has the desired flag state. The low order three bits (mask 0x7) have the flag state, and the low order bits of the next nibble (mask 0x70) have the default flag state (since 1.1.54).
KDGKBTYPE Get keyboard type. This returns the value KB 101, defined as 0x02.
KDADDIO Add I/O port as valid. Equivalent to ioperm(arg,1,1).
KDDELIO Delete I/O port as valid. Equivalent to ioperm(arg,1,0).
KDENABIO Enable I/O to video board. Equivalent to ioperm(0x3b4, 0x3df-0x3b4+1, 1).
KDDISABIO Disable I/O to video board. Equivalent to ioperm(0x3b4, 0x3df-0x3b4+ 1, 0).
KDSETMODE Set text/graphics mode. argp is one of these: 
     KD_TEXT     0x00
     KD_GRAPHICS     0x01
KDGETMODE Get text/graphics mode. argp points to a long which is set to one of the above values. KDMKTONE Generate tone of specified length. The lower 16 bits of argp specify the period in clock cycles, and the upper 16 bits give the duration in msec. If the duration is zero, the sound is turned off. Control returns immediately. For example, argp = (125<<16) + 0x637 would specify the beep normally associated with a ctrl-G.
KIOCSOUND Start or stop sound generation. The lower 16 bits of argp specify the period in clock cycles (that is, argp = 1193180/frequency). argp = 0 turns sound off. In either case, control returns immediately.
GIO_CMAP Get the current default color map from kernel. argp points to a 48-byte array.
(Since 1.3.3.)
PIO_CMAP Change the default text-mode color map. argp points to a 48-byte array that contains, in order, the red, green, and blue values for the 16 available screen colors: 0 is off, and 255 is full intensity. The default colors are, in order: black, dark red, dark green, brown, dark blue, dark purple, dark cyan, light grey, dark grey, bright red, bright green, yellow, bright blue, bright purple, bright cyan, and white. (Since 1.3.3.)
GIO_FONT Gets 256-character screen font in expanded form. argp points to an 8192-byte array. Fails with error code EINVAL if the currently loaded font is a 512-character font, or if the console is not in text mode.

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GIO_FONTX Gets screen font and associated information. argp points to a struct consolefontdesc (see PIO_FONTX). On call, the charcount field should be set to the maximum number of characters that would fit in the buffer pointed to by chardata. On return, the charcount and charheight are filled with the respective data for the currently loaded font, and the chardata array contains the font data if the initial value of charcount indicated enough space was available; otherwise the buffer is untouched and errno is set to ENOMEM. (Since 1.3.1.)
PIO_FONT Sets 256-character screen font. Load font into the EGA/VGA character generator. argp points to a 8192-byte map, with 32 bytes per character. Only first N of them are used for an 8xN font (0 < N <= 32). This call also invalidates the Unicode mapping.
PIO_FONTX Sets screen font and associated rendering information. argp points to a 
struct consolefontdesc {
u_short charcount; /* characters in font

                      (256 or 512) */
u_short charheight; /* scan lines per

                       character (1-32) */
char *chardata; /* font data in

                   expanded form */
};
If necessary, the screen will be appropriately resized, and SIGWINCH sent to the appropriate processes. This call also invalidates the Unicode mapping. (Since 1.3.1.)
PIO_FONTRESET Resets the screen font, size, and Unicode mapping to the bootup defaults. argp is unused, but should be set to NULL to ensure compatibility with future versions of Linux. (Since 1.3.28.)
GIO_SCRNMAP Get screen mapping from kernel. argp points to an area of size E_TABSZ, which is loaded with the font positions used to display each character. This call is likely to return useless information if the currently loaded font is more than 256 characters.
GIO_UNISCRNMAP Get full Unicode screen mapping from kernel. argp points to an area of size E_TABSZ*sizeof (unsigned short), which is loaded with the Unicodes each character represent. A special set of Unicodes, starting at U+F000, are used to represent "direct to font" mappings. (Since 1.3.1.)
PIO_SCRNMAP Loads the user-definable (fourth) table in the kernel that maps bytes into console screen symbols. argp points to an area of size E_TABSZ.
PIO_UNISCRNMAP Loads the user-definable (fourth) table in the kernel that maps bytes into Unicodes, which are then translated into screen symbols according to the currently loaded Unicode-to-font map. Special Unicodes starting at U+F000 can be used to map directly to the font symbols. (Since 1.3.1.)
GIO_UNIMAP Get Unicode-to-font mapping from kernel. argp points to a
struct unimapdesc {
u_short entry_ct;
struct unipair *entries;
};
where entries points to an array of
struct unipair {
u_short unicode;
u_short fontpos;
};
(Since 1.1.92.)
PIO_UNIMAP Put Unicode-to-font mapping in kernel. argp points to a struct unimapdesc. Since 1.1.92.)

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