kbd.c File Reference

#include "devices/kbd.h"
#include <ctype.h>
#include <debug.h>
#include <stdio.h>
#include <string.h>
#include "devices/input.h"
#include "devices/shutdown.h"
#include "threads/interrupt.h"
#include "threads/io.h"

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Data Structures
struct	keymap
	Maps a set of contiguous scancodes into characters. More...

Macros
#define	DATA_REG   0x60
	Keyboard data register port. More...

Functions
void	kbd_init (void)
	Initializes the keyboard. More...
void	kbd_print_stats (void)
	Prints keyboard statistics. More...
static bool	map_key (const struct keymap k[], unsigned scancode, uint8_t *c)
	Scans the array of keymaps K for SCANCODE. More...
static void	keyboard_interrupt (struct intr_frame *args UNUSED)

Variables
static bool	left_shift
	Current state of shift keys. More...
static bool	right_shift
	Left and right Shift keys. More...
static bool	left_alt
static bool	right_alt
	Left and right Alt keys. More...
static bool	left_ctrl
static bool	right_ctrl
	Left and right Ctl keys. More...
static bool	caps_lock
	Status of Caps Lock. More...
static int64_t	key_cnt
	Number of keys pressed. More...
static intr_handler_func	keyboard_interrupt
static const struct keymap	invariant_keymap []
	Keys that produce the same characters regardless of whether the Shift keys are down. More...
static const struct keymap	unshifted_keymap []
	Characters for keys pressed without Shift, for those keys where it matters. More...
static const struct keymap	shifted_keymap []
	Characters for keys pressed with Shift, for those keys where it matters. More...

Macro Definition Documentation

DATA_REG

#define DATA_REG   0x60

Keyboard data register port.

Definition at line 12 of file kbd.c.

Function Documentation

kbd_init()

void kbd_init

(

void

)

Initializes the keyboard.

Definition at line 31 of file kbd.c.

References intr_register_ext(), and keyboard_interrupt.

Referenced by pintos_init().

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kbd_print_stats()

void kbd_print_stats

(

void

)

Prints keyboard statistics.

devices/kbd.h

Definition at line 38 of file kbd.c.

References key_cnt, and printf().

Referenced by print_stats().

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keyboard_interrupt()

static void keyboard_interrupt ( struct intr_frame *args  UNUSED )

static

Definition at line 96 of file kbd.c.

References caps_lock, DATA_REG, inb(), input_full(), input_putc(), invariant_keymap, key_cnt, left_alt, left_ctrl, left_shift, map_key(), NULL, right_alt, right_ctrl, right_shift, shifted_keymap, shutdown_reboot(), tolower(), and unshifted_keymap.

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map_key()

static bool map_key ( const struct keymap  k[], unsigned  scancode, uint8_t *  c  )

static

Scans the array of keymaps K for SCANCODE.

If found, sets *C to the corresponding character and returns true. If not found, returns false and C is ignored.

Definition at line 202 of file kbd.c.

References keymap::chars, keymap::first_scancode, and strlen().

Referenced by keyboard_interrupt().

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Variable Documentation

caps_lock

bool caps_lock

static

Status of Caps Lock.

True when on, false when off.

Definition at line 22 of file kbd.c.

Referenced by keyboard_interrupt().

invariant_keymap

const struct keymap invariant_keymap[]

static

Initial value:

= 
  {
    {0x01, "\033"},             
    {0x0e, "\b"},
    {0x0f, "\tQWERTYUIOP"},
    {0x1c, "\r"},
    {0x1e, "ASDFGHJKL"},
    {0x2c, "ZXCVBNM"},
    {0x37, "*"},
    {0x39, " "},
    {0x53, "\177"},             
    {0, NULL},
  }

Keys that produce the same characters regardless of whether the Shift keys are down.

Case of letters is an exception that we handle elsewhere.

Definition at line 55 of file kbd.c.

Referenced by keyboard_interrupt().

key_cnt

int64_t key_cnt

static

Number of keys pressed.

Definition at line 25 of file kbd.c.

Referenced by kbd_print_stats(), and keyboard_interrupt().

keyboard_interrupt

intr_handler_func keyboard_interrupt

static

Definition at line 27 of file kbd.c.

Referenced by kbd_init().

left_alt

bool left_alt

static

Definition at line 17 of file kbd.c.

Referenced by keyboard_interrupt().

left_ctrl

bool left_ctrl

static

Definition at line 18 of file kbd.c.

Referenced by keyboard_interrupt().

left_shift

bool left_shift

static

Current state of shift keys.

True if depressed, false otherwise.

Definition at line 16 of file kbd.c.

Referenced by keyboard_interrupt().

right_alt

bool right_alt

static

Left and right Alt keys.

Definition at line 17 of file kbd.c.

Referenced by keyboard_interrupt().

right_ctrl

bool right_ctrl

static

Left and right Ctl keys.

Definition at line 18 of file kbd.c.

Referenced by keyboard_interrupt().

right_shift

bool right_shift

static

Left and right Shift keys.

Definition at line 16 of file kbd.c.

Referenced by keyboard_interrupt().

shifted_keymap

const struct keymap shifted_keymap[]

static

Initial value:

= 
  {
    {0x02, "!@#$%^&*()_+"},
    {0x1a, "{}"},
    {0x27, ":\"~"},
    {0x2b, "|"},
    {0x33, "<>?"},
    {0, NULL},
  }

Characters for keys pressed with Shift, for those keys where it matters.

Definition at line 83 of file kbd.c.

Referenced by keyboard_interrupt().

unshifted_keymap

const struct keymap unshifted_keymap[]

static

Initial value:

= 
  {
    {0x02, "1234567890-="},
    {0x1a, "[]"},
    {0x27, ";'`"},
    {0x2b, "\\"},
    {0x33, ",./"},
    {0, NULL},
  }

Characters for keys pressed without Shift, for those keys where it matters.

Definition at line 71 of file kbd.c.

Referenced by keyboard_interrupt().