ref: 05d9123a707dec0eaa0ab079b94e69cdb750c6db
dir: /os/boot/pc/kbd.c/
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
enum {
Data= 0x60, /* data port */
Status= 0x64, /* status port */
Inready= 0x01, /* input character ready */
Outbusy= 0x02, /* output busy */
Sysflag= 0x04, /* system flag */
Cmddata= 0x08, /* cmd==0, data==1 */
Inhibit= 0x10, /* keyboard/mouse inhibited */
Minready= 0x20, /* mouse character ready */
Rtimeout= 0x40, /* general timeout */
Parity= 0x80,
Cmd= 0x64, /* command port (write only) */
Spec= 0x80,
PF= Spec|0x20, /* num pad function key */
View= Spec|0x00, /* view (shift window up) */
KF= Spec|0x40, /* function key */
Shift= Spec|0x60,
Break= Spec|0x61,
Ctrl= Spec|0x62,
Latin= Spec|0x63,
Caps= Spec|0x64,
Num= Spec|0x65,
No= Spec|0x7F, /* no mapping */
Home= KF|13,
Up= KF|14,
Pgup= KF|15,
Print= KF|16,
Left= View,
Right= View,
End= '\r',
Down= View,
Pgdown= View,
Ins= KF|20,
Del= 0x7F,
};
uchar kbtab[] =
{
[0x00] No, 0x1b, '1', '2', '3', '4', '5', '6',
[0x08] '7', '8', '9', '0', '-', '=', '\b', '\t',
[0x10] 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i',
[0x18] 'o', 'p', '[', ']', '\n', Ctrl, 'a', 's',
[0x20] 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',
[0x28] '\'', '`', Shift, '\\', 'z', 'x', 'c', 'v',
[0x30] 'b', 'n', 'm', ',', '.', '/', Shift, No,
[0x38] Latin, ' ', Caps, KF|1, KF|2, KF|3, KF|4, KF|5,
[0x40] KF|6, KF|7, KF|8, KF|9, KF|10, Num, KF|12, Home,
[0x48] No, No, No, No, No, No, No, No,
[0x50] No, No, No, No, No, No, No, KF|11,
[0x58] KF|12, No, No, No, No, No, No, No,
};
uchar kbtabshift[] =
{
[0x00] No, 0x1b, '!', '@', '#', '$', '%', '^',
[0x08] '&', '*', '(', ')', '_', '+', '\b', '\t',
[0x10] 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I',
[0x18] 'O', 'P', '{', '}', '\n', Ctrl, 'A', 'S',
[0x20] 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':',
[0x28] '"', '~', Shift, '|', 'Z', 'X', 'C', 'V',
[0x30] 'B', 'N', 'M', '<', '>', '?', Shift, No,
[0x38] Latin, ' ', Caps, KF|1, KF|2, KF|3, KF|4, KF|5,
[0x40] KF|6, KF|7, KF|8, KF|9, KF|10, Num, KF|12, Home,
[0x48] No, No, No, No, No, No, No, No,
[0x50] No, No, No, No, No, No, No, KF|11,
[0x58] KF|12, No, No, No, No, No, No, No,
};
uchar kbtabesc1[] =
{
[0x00] No, No, No, No, No, No, No, No,
[0x08] No, No, No, No, No, No, No, No,
[0x10] No, No, No, No, No, No, No, No,
[0x18] No, No, No, No, No, Ctrl, No, No,
[0x20] No, No, No, No, No, No, No, No,
[0x28] No, No, No, No, No, No, No, No,
[0x30] No, No, No, No, No, No, No, Print,
[0x38] Latin, No, No, No, No, No, No, No,
[0x40] No, No, No, No, No, No, Break, Home,
[0x48] Up, Pgup, No, Down, No, Right, No, End,
[0x50] Left, Pgdown, Ins, Del, No, No, No, No,
[0x58] No, No, No, No, No, No, No, No,
};
struct latin
{
uchar l;
char c[2];
}latintab[] = {
L'¡', "!!", /* spanish initial ! */
L'¢', "c|", /* cent */
L'¢', "c$", /* cent */
L'£', "l$", /* pound sterling */
L'¤', "g$", /* general currency */
L'¥', "y$", /* yen */
L'¥', "j$", /* yen */
L'¦', "||", /* broken vertical bar */
L'§', "SS", /* section symbol */
L'¨', "\"\"", /* dieresis */
L'©', "cr", /* copyright */
L'©', "cO", /* copyright */
L'ª', "sa", /* super a, feminine ordinal */
L'«', "<<", /* left angle quotation */
L'¬', "no", /* not sign, hooked overbar */
L'', "--", /* soft hyphen */
L'®', "rg", /* registered trademark */
L'¯', "__", /* macron */
L'°', "s0", /* degree (sup o) */
L'±', "+-", /* plus-minus */
L'²', "s2", /* sup 2 */
L'³', "s3", /* sup 3 */
L'´', "''", /* grave accent */
L'µ', "mu", /* mu */
L'¶', "pg", /* paragraph (pilcrow) */
L'·', "..", /* centered . */
L'¸', ",,", /* cedilla */
L'¹', "s1", /* sup 1 */
L'º', "so", /* sup o */
L'»', ">>", /* right angle quotation */
L'¼', "14", /* 1/4 */
L'½', "12", /* 1/2 */
L'¾', "34", /* 3/4 */
L'¿', "??", /* spanish initial ? */
L'À', "A`", /* A grave */
L'Á', "A'", /* A acute */
L'Â', "A^", /* A circumflex */
L'Ã', "A~", /* A tilde */
L'Ä', "A\"", /* A dieresis */
L'Ä', "A:", /* A dieresis */
L'Å', "Ao", /* A circle */
L'Å', "AO", /* A circle */
L'Æ', "Ae", /* AE ligature */
L'Æ', "AE", /* AE ligature */
L'Ç', "C,", /* C cedilla */
L'È', "E`", /* E grave */
L'É', "E'", /* E acute */
L'Ê', "E^", /* E circumflex */
L'Ë', "E\"", /* E dieresis */
L'Ë', "E:", /* E dieresis */
L'Ì', "I`", /* I grave */
L'Í', "I'", /* I acute */
L'Î', "I^", /* I circumflex */
L'Ï', "I\"", /* I dieresis */
L'Ï', "I:", /* I dieresis */
L'Ð', "D-", /* Eth */
L'Ñ', "N~", /* N tilde */
L'Ò', "O`", /* O grave */
L'Ó', "O'", /* O acute */
L'Ô', "O^", /* O circumflex */
L'Õ', "O~", /* O tilde */
L'Ö', "O\"", /* O dieresis */
L'Ö', "O:", /* O dieresis */
L'Ö', "OE", /* O dieresis */
L'Ö', "Oe", /* O dieresis */
L'×', "xx", /* times sign */
L'Ø', "O/", /* O slash */
L'Ù', "U`", /* U grave */
L'Ú', "U'", /* U acute */
L'Û', "U^", /* U circumflex */
L'Ü', "U\"", /* U dieresis */
L'Ü', "U:", /* U dieresis */
L'Ü', "UE", /* U dieresis */
L'Ü', "Ue", /* U dieresis */
L'Ý', "Y'", /* Y acute */
L'Þ', "P|", /* Thorn */
L'Þ', "Th", /* Thorn */
L'Þ', "TH", /* Thorn */
L'ß', "ss", /* sharp s */
L'à', "a`", /* a grave */
L'á', "a'", /* a acute */
L'â', "a^", /* a circumflex */
L'ã', "a~", /* a tilde */
L'ä', "a\"", /* a dieresis */
L'ä', "a:", /* a dieresis */
L'å', "ao", /* a circle */
L'æ', "ae", /* ae ligature */
L'ç', "c,", /* c cedilla */
L'è', "e`", /* e grave */
L'é', "e'", /* e acute */
L'ê', "e^", /* e circumflex */
L'ë', "e\"", /* e dieresis */
L'ë', "e:", /* e dieresis */
L'ì', "i`", /* i grave */
L'í', "i'", /* i acute */
L'î', "i^", /* i circumflex */
L'ï', "i\"", /* i dieresis */
L'ï', "i:", /* i dieresis */
L'ð', "d-", /* eth */
L'ñ', "n~", /* n tilde */
L'ò', "o`", /* o grave */
L'ó', "o'", /* o acute */
L'ô', "o^", /* o circumflex */
L'õ', "o~", /* o tilde */
L'ö', "o\"", /* o dieresis */
L'ö', "o:", /* o dieresis */
L'ö', "oe", /* o dieresis */
L'÷', "-:", /* divide sign */
L'ø', "o/", /* o slash */
L'ù', "u`", /* u grave */
L'ú', "u'", /* u acute */
L'û', "u^", /* u circumflex */
L'ü', "u\"", /* u dieresis */
L'ü', "u:", /* u dieresis */
L'ü', "ue", /* u dieresis */
L'ý', "y'", /* y acute */
L'þ', "th", /* thorn */
L'þ', "p|", /* thorn */
L'ÿ', "y\"", /* y dieresis */
L'ÿ', "y:", /* y dieresis */
0, 0,
};
enum
{
/* controller command byte */
Cscs1= (1<<6), /* scan code set 1 */
Cmousedis= (1<<5), /* mouse disable */
Ckbddis= (1<<4), /* kbd disable */
Csf= (1<<2), /* system flag */
Cmouseint= (1<<1), /* mouse interrupt enable */
Ckbdint= (1<<0), /* kbd interrupt enable */
};
static uchar ccc;
int
latin1(int k1, int k2)
{
struct latin *l;
for(l=latintab; l->l; l++)
if(k1==l->c[0] && k2==l->c[1])
return l->l;
return 0;
}
/*
* wait for output no longer busy
*/
static int
outready(void)
{
int tries;
for(tries = 0; (inb(Status) & Outbusy); tries++){
if(tries > 500)
return -1;
delay(2);
}
return 0;
}
/*
* wait for input
*/
static int
inready(void)
{
int tries;
for(tries = 0; !(inb(Status) & Inready); tries++){
if(tries > 500)
return -1;
delay(2);
}
return 0;
}
/*
* ask 8042 to enable the use of address bit 20
*/
void
i8042a20(void)
{
outready();
outb(Cmd, 0xD1);
outready();
outb(Data, 0xDF);
outready();
}
/*
* ask 8042 to reset the machine
*/
void
i8042reset(void)
{
int i, x;
#ifdef notdef
ushort *s = (ushort*)(KZERO|0x472);
*s = 0x1234; /* BIOS warm-boot flag */
#endif /* notdef */
outready();
outb(Cmd, 0xFE); /* pulse reset line (means resend on AT&T machines) */
outready();
/*
* Pulse it by hand (old somewhat reliable)
*/
x = 0xDF;
for(i = 0; i < 5; i++){
x ^= 1;
outready();
outb(Cmd, 0xD1);
outready();
outb(Data, x); /* toggle reset */
delay(100);
}
}
/*
* keyboard interrupt
*/
static void
i8042intr(Ureg*, void*)
{
int s, c;
static int esc1, esc2;
static int alt, caps, ctl, num, shift;
static int lstate, k1, k2;
int keyup;
/*
* get status
*/
s = inb(Status);
if(!(s&Inready))
return;
/*
* get the character
*/
c = inb(Data);
/*
* if it's the aux port...
*/
if(s & Minready)
return;
/*
* e0's is the first of a 2 character sequence
*/
if(c == 0xe0){
esc1 = 1;
return;
} else if(c == 0xe1){
esc2 = 2;
return;
}
keyup = c&0x80;
c &= 0x7f;
if(c > sizeof kbtab){
c |= keyup;
if(c != 0xFF) /* these come fairly often: CAPSLOCK U Y */
print("unknown key %ux\n", c);
return;
}
if(esc1){
c = kbtabesc1[c];
esc1 = 0;
} else if(esc2){
esc2--;
return;
} else if(shift)
c = kbtabshift[c];
else
c = kbtab[c];
if(caps && c<='z' && c>='a')
c += 'A' - 'a';
/*
* keyup only important for shifts
*/
if(keyup){
switch(c){
case Latin:
alt = 0;
break;
case Shift:
shift = 0;
break;
case Ctrl:
ctl = 0;
break;
}
return;
}
/*
* normal character
*/
if(!(c & Spec)){
if(ctl){
if(alt && c == Del)
warp86("\nCtrl-Alt-Del\n", 0);
c &= 0x1f;
}
switch(lstate){
case 1:
k1 = c;
lstate = 2;
return;
case 2:
k2 = c;
lstate = 0;
c = latin1(k1, k2);
if(c == 0){
kbdchar(k1);
c = k2;
}
/* fall through */
default:
break;
}
} else {
switch(c){
case Caps:
caps ^= 1;
return;
case Num:
num ^= 1;
return;
case Shift:
shift = 1;
return;
case Latin:
alt = 1;
lstate = 1;
return;
case Ctrl:
ctl = 1;
return;
}
}
kbdchar(c);
}
static char *initfailed = "kbd init failed\n";
void
i8042init(void)
{
int c;
/* wait for a quiescent controller */
while((c = inb(Status)) & (Outbusy | Inready))
if(c & Inready)
inb(Data);
/* get current controller command byte */
outb(Cmd, 0x20);
if(inready() < 0){
print("kbdinit: can't read ccc\n");
ccc = 0;
} else
ccc = inb(Data);
/* enable kbd xfers and interrupts */
ccc &= ~Ckbddis;
ccc |= Csf | Ckbdint | Cscs1;
if(outready() < 0)
print(initfailed);
outb(Cmd, 0x60);
if(outready() < 0)
print(initfailed);
outb(Data, ccc);
if(outready() < 0)
print(initfailed);
setvec(VectorKBD, i8042intr, 0);
}