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minix/drivers/tty/keyboard.c
David van Moolenbroek b4d909d415 Split block/character protocols and libdriver 
This patch separates the character and block driver communication
protocols. The old character protocol remains the same, but a new
block protocol is introduced. The libdriver library is replaced by
two new libraries: libchardriver and libblockdriver. Their exposed
API, and drivers that use them, have been updated accordingly.
Together, libbdev and libblockdriver now completely abstract away
the message format used by the block protocol. As the memory driver
is both a character and a block device driver, it now implements its
own message loop.

The most important semantic change made to the block protocol is that
it is no longer possible to return both partial results and an error
for a single transfer. This simplifies the interaction between the
caller and the driver, as the I/O vector no longer needs to be copied
back. Also, drivers are now no longer supposed to decide based on the
layout of the I/O vector when a transfer should be cut short. Put
simply, transfers are now supposed to either succeed completely, or
result in an error.

After this patch, the state of the various pieces is as follows:
- block protocol: stable
- libbdev API: stable for synchronous communication
- libblockdriver API: needs slight revision (the drvlib/partition API
  in particular; the threading API will also change shortly)
- character protocol: needs cleanup
- libchardriver API: needs cleanup accordingly
- driver restarts: largely unsupported until endpoint changes are
  reintroduced

As a side effect, this patch eliminates several bugs, hacks, and gcc
-Wall and -W warnings all over the place. It probably introduces a
few new ones, too.

Update warning: this patch changes the protocol between MFS and disk
drivers, so in order to use old/new images, the MFS from the ramdisk
must be used to mount all file systems.
2011-11-23 14:06:37 +01:00

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/* Keyboard driver for PC's and AT's.
*
* Changes:
* Jul 13, 2004 processes can observe function keys (Jorrit N. Herder)
* Jun 15, 2004 removed wreboot(), except panic dumps (Jorrit N. Herder)
* Feb 04, 1994 loadable keymaps (Marcus Hampel)
*/
#include <minix/drivers.h>
#include <sys/ioctl.h>
#include <sys/kbdio.h>
#include <sys/time.h>
#include <sys/select.h>
#include <termios.h>
#include <signal.h>
#include <unistd.h>
#include <machine/archtypes.h>
#include <minix/callnr.h>
#include <minix/com.h>
#include <minix/input.h>
#include <minix/keymap.h>
#include "tty.h"
#include "kernel/const.h"
#include "kernel/config.h"
#include "kernel/type.h"
#include "kernel/proc.h"
PRIVATE u16_t keymap[NR_SCAN_CODES * MAP_COLS] = {
#include "keymaps/us-std.src"
};
PRIVATE u16_t keymap_escaped[NR_SCAN_CODES * MAP_COLS] = {
#include "keymaps/us-std-esc.src"
};
PRIVATE int irq_hook_id = -1;
PRIVATE int aux_irq_hook_id = -1;
/* Standard and AT keyboard. (PS/2 MCA implies AT throughout.) */
#define KEYBD 0x60 /* I/O port for keyboard data */
/* AT keyboard. */
#define KB_COMMAND 0x64 /* I/O port for commands on AT */
#define KB_STATUS 0x64 /* I/O port for status on AT */
#define KB_ACK 0xFA /* keyboard ack response */
#define KB_AUX_BYTE 0x20 /* Auxiliary Device Output Buffer Full */
#define KB_OUT_FULL 0x01 /* status bit set when keypress char pending */
#define KB_IN_FULL 0x02 /* status bit set when not ready to receive */
#define KBC_RD_RAM_CCB 0x20 /* Read controller command byte */
#define KBC_WR_RAM_CCB 0x60 /* Write controller command byte */
#define KBC_DI_AUX 0xA7 /* Disable Auxiliary Device */
#define KBC_EN_AUX 0xA8 /* Enable Auxiliary Device */
#define KBC_DI_KBD 0xAD /* Disable Keybard Interface */
#define KBC_EN_KBD 0xAE /* Enable Keybard Interface */
#define KBC_WRITE_AUX 0xD4 /* Write to Auxiliary Device */
#define LED_CODE 0xED /* command to keyboard to set LEDs */
#define MAX_KB_ACK_RETRIES 0x1000 /* max #times to wait for kb ack */
#define MAX_KB_BUSY_RETRIES 0x1000 /* max #times to loop while kb busy */
#define KBIT 0x80 /* bit used to ack characters to keyboard */
#define KBC_IN_DELAY 7 /* wait 7 microseconds when polling */
/* Miscellaneous. */
#define ESC_SCAN 0x01 /* reboot key when panicking */
#define SLASH_SCAN 0x35 /* to recognize numeric slash */
#define RSHIFT_SCAN 0x36 /* to distinguish left and right shift */
#define HOME_SCAN 0x47 /* first key on the numeric keypad */
#define INS_SCAN 0x52 /* INS for use in CTRL-ALT-INS reboot */
#define DEL_SCAN 0x53 /* DEL for use in CTRL-ALT-DEL reboot */
#define KBD_BUFSZ 1024 /* Buffer size for raw scan codes */
#define KBD_OUT_BUFSZ 16 /* Output buffer to sending data to the
* keyboard.
*/
#define CONSOLE 0 /* line number for console */
#define KB_IN_BYTES 32 /* size of keyboard input buffer */
PRIVATE char injbuf[KB_IN_BYTES];
PRIVATE char *injhead = injbuf;
PRIVATE char *injtail = injbuf;
PRIVATE int injcount;
PRIVATE char ibuf[KB_IN_BYTES]; /* input buffer */
PRIVATE char *ihead = ibuf; /* next free spot in input buffer */
PRIVATE char *itail = ibuf; /* scan code to return to TTY */
PRIVATE int icount; /* # codes in buffer */
PRIVATE int esc; /* escape scan code detected? */
PRIVATE int alt_l; /* left alt key state */
PRIVATE int alt_r; /* right alt key state */
PRIVATE int alt; /* either alt key */
PRIVATE int ctrl_l; /* left control key state */
PRIVATE int ctrl_r; /* right control key state */
PRIVATE int ctrl; /* either control key */
PRIVATE int shift_l; /* left shift key state */
PRIVATE int shift_r; /* right shift key state */
PRIVATE int shift; /* either shift key */
PRIVATE int num_down; /* num lock key depressed */
PRIVATE int caps_down; /* caps lock key depressed */
PRIVATE int scroll_down; /* scroll lock key depressed */
PRIVATE int alt_down; /* alt key depressed */
PRIVATE int locks[NR_CONS]; /* per console lock keys state */
/* Lock key active bits. Chosen to be equal to the keyboard LED bits. */
#define SCROLL_LOCK 0x01
#define NUM_LOCK 0x02
#define CAPS_LOCK 0x04
#define ALT_LOCK 0x08
PRIVATE char numpad_map[12] =
{'H', 'Y', 'A', 'B', 'D', 'C', 'V', 'U', 'G', 'S', 'T', '@'};
PRIVATE char *fkey_map[12] =
{"11", "12", "13", "14", "15", "17", /* F1-F6 */
"18", "19", "20", "21", "23", "24"}; /* F7-F12 */
/* Variables and definition for observed function keys. */
typedef struct observer { int proc_nr; int events; } obs_t;
PRIVATE obs_t fkey_obs[12]; /* observers for F1-F12 */
PRIVATE obs_t sfkey_obs[12]; /* observers for SHIFT F1-F12 */
PRIVATE struct kbd
{
int minor;
int nr_open;
char buf[KBD_BUFSZ];
int offset;
int avail;
int req_size;
int req_proc;
cp_grant_id_t req_grant;
vir_bytes req_addr_offset;
int incaller;
int select_ops;
int select_proc;
} kbd, kbdaux;
/* Data that is to be sent to the keyboard. Each byte is ACKed by the
* keyboard.
*/
PRIVATE struct kbd_outack
{
unsigned char buf[KBD_OUT_BUFSZ];
int offset;
int avail;
int expect_ack;
} kbdout;
PRIVATE int kbd_watchdog_set= 0;
PRIVATE int kbd_alive= 1;
PRIVATE long sticky_alt_mode = 0;
PRIVATE long debug_fkeys = 1;
PRIVATE timer_t tmr_kbd_wd;
FORWARD _PROTOTYPE( void handle_req, (struct kbd *kbdp, message *m) );
FORWARD _PROTOTYPE( int handle_status, (struct kbd *kbdp, message *m) );
FORWARD _PROTOTYPE( void kbc_cmd0, (int cmd) );
FORWARD _PROTOTYPE( void kbc_cmd1, (int cmd, int data) );
FORWARD _PROTOTYPE( int kbc_read, (void) );
FORWARD _PROTOTYPE( void kbd_send, (void) );
FORWARD _PROTOTYPE( int kb_ack, (void) );
FORWARD _PROTOTYPE( int kb_wait, (void) );
FORWARD _PROTOTYPE( int func_key, (int scode) );
FORWARD _PROTOTYPE( int scan_keyboard, (unsigned char *bp, int *isauxp) );
FORWARD _PROTOTYPE( unsigned make_break, (int scode) );
FORWARD _PROTOTYPE( void set_leds, (void) );
FORWARD _PROTOTYPE( void show_key_mappings, (void) );
FORWARD _PROTOTYPE( int kb_read, (struct tty *tp, int try) );
FORWARD _PROTOTYPE( unsigned map_key, (int scode) );
FORWARD _PROTOTYPE( void kbd_watchdog, (timer_t *tmrp) );
int micro_delay(u32_t usecs)
{
/* TTY can't use the library micro_delay() as that calls PM. */
tickdelay(micros_to_ticks(usecs));
return OK;
}
/*===========================================================================*
* do_kbd *
*===========================================================================*/
PUBLIC void do_kbd(message *m)
{
handle_req(&kbd, m);
}
/*===========================================================================*
* kbd_status *
*===========================================================================*/
PUBLIC int kbd_status(message *m)
{
int r;
r= handle_status(&kbd, m);
if (r)
return r;
return handle_status(&kbdaux, m);
}
/*===========================================================================*
* do_kbdaux *
*===========================================================================*/
PUBLIC void do_kbdaux(message *m)
{
handle_req(&kbdaux, m);
}
/*===========================================================================*
* handle_req *
*===========================================================================*/
PRIVATE void handle_req(kbdp, m)
struct kbd *kbdp;
message *m;
{
int i, n, r, ops, watch;
unsigned char c;
/* Execute the requested device driver function. */
r= EINVAL; /* just in case */
switch (m->m_type) {
case DEV_OPEN:
kbdp->nr_open++;
r= OK;
break;
case DEV_CLOSE:
kbdp->nr_open--;
if (kbdp->nr_open < 0)
{
printf("TTY(kbd): open count is negative\n");
kbdp->nr_open= 0;
}
if (kbdp->nr_open == 0)
kbdp->avail= 0;
r= OK;
break;
case DEV_READ_S:
if (kbdp->req_size)
{
/* We handle only request at a time */
r= EIO;
break;
}
if (kbdp->avail == 0)
{
/* Should record proc */
kbdp->req_size= m->COUNT;
kbdp->req_proc= m->USER_ENDPT;
kbdp->req_grant= (cp_grant_id_t) m->IO_GRANT;
kbdp->req_addr_offset= 0;
kbdp->incaller= m->m_source;
r= SUSPEND;
break;
}
/* Handle read request */
n= kbdp->avail;
if (n > m->COUNT)
n= m->COUNT;
if (kbdp->offset + n > KBD_BUFSZ)
n= KBD_BUFSZ-kbdp->offset;
if (n <= 0)
panic("do_kbd(READ): bad n: %d", n);
r= sys_safecopyto(m->m_source, (cp_grant_id_t) m->IO_GRANT, 0,
(vir_bytes) &kbdp->buf[kbdp->offset], n, D);
if (r == OK)
{
kbdp->offset= (kbdp->offset+n) % KBD_BUFSZ;
kbdp->avail -= n;
r= n;
} else {
printf("copy in read kbd failed: %d\n", r);
}
break;
case DEV_WRITE_S:
if (kbdp != &kbdaux)
{
printf("write to keyboard not implemented\n");
r= EINVAL;
break;
}
/* Assume that output to AUX only happens during
* initialization and we can afford to lose input. This should
* be fixed at a later time.
*/
for (i= 0; i<m->COUNT; i++)
{
r= sys_safecopyfrom(m->m_source, (cp_grant_id_t)
m->IO_GRANT, i, (vir_bytes) &c, 1, D);
if (r != OK)
break;
kbc_cmd1(KBC_WRITE_AUX, c);
}
r= i;
break;
case CANCEL:
kbdp->req_size= 0;
r= OK;
break;
case DEV_SELECT:
ops = m->USER_ENDPT & (SEL_RD|SEL_WR|SEL_ERR);
watch = (m->USER_ENDPT & SEL_NOTIFY) ? 1 : 0;
r= 0;
if (kbdp->avail && (ops & SEL_RD))
{
r |= SEL_RD;
break;
}
if (ops && watch)
{
kbdp->select_ops |= ops;
kbdp->select_proc= m->m_source;
}
break;
case DEV_IOCTL_S:
if (kbdp == &kbd && m->TTY_REQUEST == KIOCSLEDS)
{
kio_leds_t leds;
unsigned char b;
r= sys_safecopyfrom(m->m_source, (cp_grant_id_t)
m->IO_GRANT, 0, (vir_bytes) &leds,
sizeof(leds), D);
if (r != OK)
break;
b= 0;
if (leds.kl_bits & KBD_LEDS_NUM) b |= NUM_LOCK;
if (leds.kl_bits & KBD_LEDS_CAPS) b |= CAPS_LOCK;
if (leds.kl_bits & KBD_LEDS_SCROLL) b |= SCROLL_LOCK;
if (kbdout.avail == 0)
kbdout.offset= 0;
if (kbdout.offset + kbdout.avail + 2 > KBD_OUT_BUFSZ)
{
/* Output buffer is full. Ignore this command.
* Reset ACK flag.
*/
kbdout.expect_ack= 0;
}
else
{
kbdout.buf[kbdout.offset+kbdout.avail]=
LED_CODE;
kbdout.buf[kbdout.offset+kbdout.avail+1]= b;
kbdout.avail += 2;
}
if (!kbdout.expect_ack)
kbd_send();
r= OK;
break;
}
if (kbdp == &kbd && m->TTY_REQUEST == KIOCBELL)
{
kio_bell_t bell;
clock_t ticks;
r = sys_safecopyfrom(m->m_source, (cp_grant_id_t)
m->IO_GRANT, 0, (vir_bytes) &bell,
sizeof(bell), D);
if (r != OK)
break;
ticks= bell.kb_duration.tv_usec * system_hz / 1000000;
ticks += bell.kb_duration.tv_sec * system_hz;
if (!ticks)
ticks++;
beep_x(bell.kb_pitch, ticks);
r= OK;
break;
}
r= ENOTTY;
break;
default:
printf("Warning, TTY(kbd) got unexpected request %d from %d\n",
m->m_type, m->m_source);
r= EINVAL;
}
tty_reply(TASK_REPLY, m->m_source, m->USER_ENDPT, r);
}
/*===========================================================================*
* handle_status *
*===========================================================================*/
PRIVATE int handle_status(kbdp, m)
struct kbd *kbdp;
message *m;
{
int n, r;
if (kbdp->avail && kbdp->req_size && m->m_source == kbdp->incaller)
{
/* Handle read request */
n= kbdp->avail;
if (n > kbdp->req_size)
n= kbdp->req_size;
if (kbdp->offset + n > KBD_BUFSZ)
n= KBD_BUFSZ-kbdp->offset;
if (n <= 0)
panic("kbd_status: bad n: %d", n);
kbdp->req_size= 0;
r= sys_safecopyto(kbdp->incaller, kbdp->req_grant, 0,
(vir_bytes)&kbdp->buf[kbdp->offset], n, D);
if (r == OK)
{
kbdp->offset= (kbdp->offset+n) % KBD_BUFSZ;
kbdp->avail -= n;
r= n;
} else printf("copy in revive kbd failed: %d\n", r);
m->m_type = DEV_REVIVE;
m->REP_ENDPT= kbdp->req_proc;
m->REP_IO_GRANT= kbdp->req_grant;
m->REP_STATUS= r;
return 1;
}
if (kbdp->avail && (kbdp->select_ops & SEL_RD) &&
m->m_source == kbdp->select_proc)
{
m->m_type = DEV_IO_READY;
m->DEV_MINOR = kbdp->minor;
m->DEV_SEL_OPS = SEL_RD;
kbdp->select_ops &= ~SEL_RD;
return 1;
}
return 0;
}
/*===========================================================================*
* map_key *
*===========================================================================*/
PRIVATE unsigned map_key(scode)
int scode;
{
/* Map a scan code to an ASCII code. */
int caps, column, lk;
u16_t *keyrow;
if(esc)
keyrow = &keymap_escaped[scode * MAP_COLS];
else
keyrow = &keymap[scode * MAP_COLS];
caps = shift;
lk = locks[ccurrent];
if ((lk & NUM_LOCK) && HOME_SCAN <= scode && scode <= DEL_SCAN) caps = !caps;
if ((lk & CAPS_LOCK) && (keyrow[0] & HASCAPS)) caps = !caps;
if (alt) {
column = 2;
if (ctrl || alt_r) column = 3; /* Ctrl + Alt == AltGr */
if (caps) column = 4;
} else {
if (sticky_alt_mode && (lk & ALT_LOCK)) {
column = 2;
if (caps) column = 4;
} else {
column = 0;
if (caps) column = 1;
if (ctrl) column = 5;
}
}
return keyrow[column] & ~HASCAPS;
}
/*===========================================================================*
* kbd_interrupt *
*===========================================================================*/
PUBLIC void kbd_interrupt(message *UNUSED(m_ptr))
{
/* A keyboard interrupt has occurred. Process it. */
int o, isaux;
unsigned char scode;
struct kbd *kbdp;
/* Fetch the character from the keyboard hardware and acknowledge it. */
if (!scan_keyboard(&scode, &isaux))
return;
if (isaux)
kbdp= &kbdaux;
else if (kbd.nr_open)
kbdp= &kbd;
else
kbdp= NULL;
if (kbdp)
{
/* raw scan codes or aux data */
if (kbdp->avail >= KBD_BUFSZ)
{
#if 0
printf("kbd_interrupt: %s buffer is full\n",
isaux ? "kbdaux" : "keyboard");
#endif
return; /* Buffer is full */
}
o= (kbdp->offset + kbdp->avail) % KBD_BUFSZ;
kbdp->buf[o]= scode;
kbdp->avail++;
if (kbdp->req_size) {
notify(kbdp->incaller);
}
if (kbdp->select_ops & SEL_RD)
notify(kbdp->select_proc);
return;
}
/* Store the scancode in memory so the task can get at it later. */
if (icount < KB_IN_BYTES) {
*ihead++ = scode;
if (ihead == ibuf + KB_IN_BYTES) ihead = ibuf;
icount++;
tty_table[ccurrent].tty_events = 1;
if (tty_table[ccurrent].tty_select_ops & SEL_RD) {
select_retry(&tty_table[ccurrent]);
}
}
}
PUBLIC void do_kb_inject(message *msg)
{
unsigned char scode;
/* only handle keyboard events */
if (msg->INPUT_TYPE == INPUT_EV_KEY) {
scode = msg->INPUT_CODE;
/* is it a KEY RELEASE? */
if (msg->INPUT_VALUE == 0) {
scode |= KEY_RELEASE;
}
if (injcount < KB_IN_BYTES) {
*injhead++ = scode;
if (injhead == injbuf + KB_IN_BYTES) injhead = injbuf;
injcount++;
tty_table[ccurrent].tty_events = 1;
if (tty_table[ccurrent].tty_select_ops & SEL_RD) {
select_retry(&tty_table[ccurrent]);
}
}
}
}
/*===========================================================================*
* kb_read *
*===========================================================================*/
PRIVATE int kb_read(tp, try)
tty_t *tp;
int try;
{
/* Process characters from the circular keyboard buffer. */
char buf[7], *p, suffix;
int scode;
unsigned ch;
/* always use the current console */
tp = &tty_table[ccurrent];
if (try) {
if (icount > 0) return 1;
return 0;
}
while (icount > 0 || injcount > 0) {
if (injcount > 0) {
/* take one key scan code */
scode = *injtail++;
if (injtail == injbuf + KB_IN_BYTES) injtail = injbuf;
injcount--;
} else {
/* take one key scan code */
scode = *itail++;
if (itail == ibuf + KB_IN_BYTES) itail = ibuf;
icount--;
}
/* Function keys are being used for debug dumps (if enabled). */
if (debug_fkeys && func_key(scode)) continue;
/* Perform make/break processing. */
ch = make_break(scode);
if (ch <= 0xFF) {
/* A normal character. */
buf[0] = ch;
(void) in_process(tp, buf, 1, scode);
} else
if (HOME <= ch && ch <= INSRT) {
/* An ASCII escape sequence generated by the numeric pad. */
buf[0] = ESC;
buf[1] = '[';
buf[2] = numpad_map[ch - HOME];
(void) in_process(tp, buf, 3, scode);
} else
if ((F1 <= ch && ch <= F12) || (SF1 <= ch && ch <= SF12) ||
(CF1 <= ch && ch <= CF12 && !debug_fkeys)) {
/* An escape sequence generated by function keys. */
if (F1 <= ch && ch <= F12) {
ch -= F1;
suffix = 0;
} else
if (SF1 <= ch && ch <= SF12) {
ch -= SF1;
suffix = '2';
} else
/* (CF1 <= ch && ch <= CF12) */ {
ch -= CF1;
suffix = shift ? '6' : '5';
}
/* ^[[11~ for F1, ^[[24;5~ for CF12 etc */
buf[0] = ESC;
buf[1] = '[';
buf[2] = fkey_map[ch][0];
buf[3] = fkey_map[ch][1];
p = &buf[4];
if (suffix) {
*p++ = ';';
*p++ = suffix;
}
*p++ = '~';
(void) in_process(tp, buf, p - buf, scode);
} else
if (ch == ALEFT) {
/* Choose lower numbered console as current console. */
select_console(ccurrent - 1);
set_leds();
} else
if (ch == ARIGHT) {
/* Choose higher numbered console as current console. */
select_console(ccurrent + 1);
set_leds();
} else
if (AF1 <= ch && ch <= AF12) {
/* Alt-F1 is console, Alt-F2 is ttyc1, etc. */
select_console(ch - AF1);
set_leds();
} else
if (CF1 <= ch && ch <= CF12) {
switch(ch) {
case CF1: show_key_mappings(); break;
case CF3: toggle_scroll(); break; /* hardware <-> software */
case CF7: sigchar(&tty_table[CONSOLE], SIGQUIT, 1); break;
case CF8: sigchar(&tty_table[CONSOLE], SIGINT, 1); break;
case CF9: sigchar(&tty_table[CONSOLE], SIGKILL, 1); break;
}
} else {
/* pass on scancode even though there is no character code */
(void) in_process(tp, NULL, 0, scode);
}
}
return 1;
}
/*===========================================================================*
* kbd_send *
*===========================================================================*/
PRIVATE void kbd_send()
{
unsigned long sb;
int r;
if (!kbdout.avail)
return;
if (kbdout.expect_ack)
return;
if((r=sys_inb(KB_STATUS, &sb)) != OK) {
printf("kbd_send: 1 sys_inb() failed: %d\n", r);
}
if (sb & (KB_OUT_FULL|KB_IN_FULL))
{
printf("not sending 1: sb = 0x%lx\n", sb);
return;
}
micro_delay(KBC_IN_DELAY);
if((r=sys_inb(KB_STATUS, &sb)) != OK) {
printf("kbd_send: 2 sys_inb() failed: %d\n", r);
}
if (sb & (KB_OUT_FULL|KB_IN_FULL))
{
printf("not sending 2: sb = 0x%lx\n", sb);
return;
}
/* Okay, buffer is really empty */
#if 0
printf("sending byte 0x%x to keyboard\n", kbdout.buf[kbdout.offset]);
#endif
if((r=sys_outb(KEYBD, kbdout.buf[kbdout.offset])) != OK) {
printf("kbd_send: 3 sys_inb() failed: %d\n", r);
}
kbdout.offset++;
kbdout.avail--;
kbdout.expect_ack= 1;
kbd_alive= 1;
if (kbd_watchdog_set)
{
/* Set a watchdog timer for one second. */
set_timer(&tmr_kbd_wd, system_hz, kbd_watchdog, 0);
kbd_watchdog_set= 1;
}
}
/*===========================================================================*
* make_break *
*===========================================================================*/
PRIVATE unsigned make_break(scode)
int scode; /* scan code of key just struck or released */
{
/* This routine can handle keyboards that interrupt only on key depression,
* as well as keyboards that interrupt on key depression and key release.
* For efficiency, the interrupt routine filters out most key releases.
*/
int ch, make, escape;
static int CAD_count = 0;
static int rebooting = 0;
/* Check for CTRL-ALT-DEL, and if found, halt the computer. This would
* be better done in keyboard() in case TTY is hung, except control and
* alt are set in the high level code.
*/
if (ctrl && alt && (scode == DEL_SCAN || scode == INS_SCAN))
{
if (++CAD_count == 3) {
cons_stop();
sys_abort(RBT_DEFAULT);
}
sys_kill(INIT_PROC_NR, SIGABRT);
rebooting = 1;
}
if(rebooting)
return -1;
/* High-order bit set on key release. */
make = (scode & KEY_RELEASE) == 0; /* true if pressed */
ch = map_key(scode &= ASCII_MASK); /* map to ASCII */
escape = esc; /* Key is escaped? (true if added since the XT) */
esc = 0;
switch (ch) {
case CTRL: /* Left or right control key */
*(escape ? &ctrl_r : &ctrl_l) = make;
ctrl = ctrl_l | ctrl_r;
break;
case SHIFT: /* Left or right shift key */
*(scode == RSHIFT_SCAN ? &shift_r : &shift_l) = make;
shift = shift_l | shift_r;
break;
case ALT: /* Left or right alt key */
*(escape ? &alt_r : &alt_l) = make;
alt = alt_l | alt_r;
if (sticky_alt_mode && (alt_r && (alt_down < make))) {
locks[ccurrent] ^= ALT_LOCK;
}
alt_down = make;
break;
case CALOCK: /* Caps lock - toggle on 0 -> 1 transition */
if (caps_down < make) {
locks[ccurrent] ^= CAPS_LOCK;
set_leds();
}
caps_down = make;
break;
case NLOCK: /* Num lock */
if (num_down < make) {
locks[ccurrent] ^= NUM_LOCK;
set_leds();
}
num_down = make;
break;
case SLOCK: /* Scroll lock */
if (scroll_down < make) {
locks[ccurrent] ^= SCROLL_LOCK;
set_leds();
}
scroll_down = make;
break;
case EXTKEY: /* Escape keycode */
esc = 1; /* Next key is escaped */
return(-1);
default: /* A normal key */
if(!make)
return -1;
if(ch)
return ch;
{
static char seen[2][NR_SCAN_CODES];
int notseen = 0, ei;
ei = escape ? 1 : 0;
if(scode >= 0 && scode < NR_SCAN_CODES) {
notseen = !seen[ei][scode];
seen[ei][scode] = 1;
} else {
printf("tty: scode %d makes no sense\n", scode);
}
if(notseen) {
printf("tty: ignoring unrecognized %s "
"scancode 0x%x\n",
escape ? "escaped" : "straight", scode);
}
}
return -1;
}
/* Key release, or a shift type key. */
return(-1);
}
/*===========================================================================*
* set_leds *
*===========================================================================*/
PRIVATE void set_leds()
{
/* Set the LEDs on the caps, num, and scroll lock keys */
int s;
kb_wait(); /* wait for buffer empty */
if ((s=sys_outb(KEYBD, LED_CODE)) != OK)
printf("Warning, sys_outb couldn't prepare for LED values: %d\n", s);
/* prepare keyboard to accept LED values */
kb_ack(); /* wait for ack response */
kb_wait(); /* wait for buffer empty */
if ((s=sys_outb(KEYBD, locks[ccurrent])) != OK)
printf("Warning, sys_outb couldn't give LED values: %d\n", s);
/* give keyboard LED values */
kb_ack(); /* wait for ack response */
}
/*===========================================================================*
* kbc_cmd0 *
*===========================================================================*/
PRIVATE void kbc_cmd0(cmd)
int cmd;
{
kb_wait();
if(sys_outb(KB_COMMAND, cmd) != OK)
printf("kbc_cmd0: sys_outb failed\n");
}
/*===========================================================================*
* kbc_cmd1 *
*===========================================================================*/
PRIVATE void kbc_cmd1(cmd, data)
int cmd;
int data;
{
kb_wait();
if(sys_outb(KB_COMMAND, cmd) != OK)
printf("kbc_cmd1: 1 sys_outb failed\n");
kb_wait();
if(sys_outb(KEYBD, data) != OK)
printf("kbc_cmd1: 2 sys_outb failed\n");
}
/*===========================================================================*
* kbc_read *
*===========================================================================*/
PRIVATE int kbc_read()
{
int i;
unsigned long byte, st;
#if 0
struct micro_state ms;
#endif
#if DEBUG
printf("in kbc_read\n");
#endif
/* Wait at most 1 second for a byte from the keyboard or
* the kbd controller, return -1 on a timeout.
*/
for (i= 0; i<1000000; i++)
#if 0
micro_start(&ms);
do
#endif
{
if(sys_inb(KB_STATUS, &st) != OK)
printf("kbc_read: 1 sys_inb failed\n");
if (st & KB_OUT_FULL)
{
micro_delay(KBC_IN_DELAY);
if(sys_inb(KEYBD, &byte) != OK)
printf("kbc_read: 2 sys_inb failed\n");
if (st & KB_AUX_BYTE)
printf("kbc_read: aux byte 0x%lx\n", byte);
#if DEBUG
printf("keyboard`kbc_read: returning byte 0x%lx\n",
byte);
#endif
return byte;
}
}
#if 0
while (micro_elapsed(&ms) < 1000000);
#endif
panic("kbc_read failed to complete");
return EINVAL;
}
/*===========================================================================*
* kb_wait *
*===========================================================================*/
PRIVATE int kb_wait()
{
/* Wait until the controller is ready; return zero if this times out. */
int retries;
unsigned long status;
int s, isaux;
unsigned char byte;
retries = MAX_KB_BUSY_RETRIES + 1; /* wait until not busy */
do {
s = sys_inb(KB_STATUS, &status);
if(s != OK)
printf("kb_wait: sys_inb failed: %d\n", s);
if (status & KB_OUT_FULL) {
if (scan_keyboard(&byte, &isaux))
{
#if 0
printf("ignoring %sbyte in kb_wait\n", isaux ? "AUX " : "");
#endif
}
}
if (! (status & (KB_IN_FULL|KB_OUT_FULL)) )
break; /* wait until ready */
} while (--retries != 0); /* continue unless timeout */
return(retries); /* zero on timeout, positive if ready */
}
/*===========================================================================*
* kb_ack *
*===========================================================================*/
PRIVATE int kb_ack()
{
/* Wait until kbd acknowledges last command; return zero if this times out. */
int retries, s;
unsigned long u8val;
retries = MAX_KB_ACK_RETRIES + 1;
do {
s = sys_inb(KEYBD, &u8val);
if(s != OK)
printf("kb_ack: sys_inb failed: %d\n", s);
if (u8val == KB_ACK)
break; /* wait for ack */
} while(--retries != 0); /* continue unless timeout */
return(retries); /* nonzero if ack received */
}
/*===========================================================================*
* kb_init *
*===========================================================================*/
PUBLIC void kb_init(tp)
tty_t *tp;
{
/* Initialize the keyboard driver. */
tp->tty_devread = kb_read; /* input function */
}
/*===========================================================================*
* kb_init_once *
*===========================================================================*/
PUBLIC void kb_init_once(void)
{
int i;
u8_t ccb;
env_parse("sticky_alt", "d", 0, &sticky_alt_mode, 0, 1);
env_parse("debug_fkeys", "d", 0, &debug_fkeys, 0, 1);
set_leds(); /* turn off numlock led */
scan_keyboard(NULL, NULL); /* discard leftover keystroke */
/* Clear the function key observers array. Also see func_key(). */
for (i=0; i<12; i++) {
fkey_obs[i].proc_nr = NONE; /* F1-F12 observers */
fkey_obs[i].events = 0; /* F1-F12 observers */
sfkey_obs[i].proc_nr = NONE; /* Shift F1-F12 observers */
sfkey_obs[i].events = 0; /* Shift F1-F12 observers */
}
kbd.minor= KBD_MINOR;
kbdaux.minor= KBDAUX_MINOR;
/* Set interrupt handler and enable keyboard IRQ. */
irq_hook_id = KEYBOARD_IRQ; /* id to be returned on interrupt */
if ((i=sys_irqsetpolicy(KEYBOARD_IRQ, IRQ_REENABLE, &irq_hook_id)) != OK)
panic("Couldn't set keyboard IRQ policy: %d", i);
if ((i=sys_irqenable(&irq_hook_id)) != OK)
panic("Couldn't enable keyboard IRQs: %d", i);
kbd_irq_set |= (1 << KEYBOARD_IRQ);
/* Set AUX interrupt handler and enable AUX IRQ. */
aux_irq_hook_id = KBD_AUX_IRQ; /* id to be returned on interrupt */
if ((i=sys_irqsetpolicy(KBD_AUX_IRQ, IRQ_REENABLE,
&aux_irq_hook_id)) != OK)
panic("Couldn't set AUX IRQ policy: %d", i);
if ((i=sys_irqenable(&aux_irq_hook_id)) != OK)
panic("Couldn't enable AUX IRQs: %d", i);
kbd_irq_set |= (1 << KBD_AUX_IRQ);
/* Disable the keyboard and aux */
kbc_cmd0(KBC_DI_KBD);
kbc_cmd0(KBC_DI_AUX);
/* Get the current configuration byte */
kbc_cmd0(KBC_RD_RAM_CCB);
ccb= kbc_read();
/* Enable both interrupts. */
kbc_cmd1(KBC_WR_RAM_CCB, ccb | 3);
/* Re-enable the keyboard device. */
kbc_cmd0(KBC_EN_KBD);
/* Enable the aux device. */
kbc_cmd0(KBC_EN_AUX);
}
/*===========================================================================*
* kbd_loadmap *
*===========================================================================*/
PUBLIC int kbd_loadmap(m)
message *m;
{
/* Load a new keymap. */
return sys_safecopyfrom(m->m_source, (cp_grant_id_t) m->IO_GRANT,
0, (vir_bytes) keymap, (vir_bytes) sizeof(keymap), D);
}
/*===========================================================================*
* do_fkey_ctl *
*===========================================================================*/
PUBLIC void do_fkey_ctl(m_ptr)
message *m_ptr; /* pointer to the request message */
{
/* This procedure allows processes to register a function key to receive
* notifications if it is pressed. At most one binding per key can exist.
*/
int i;
int result = EINVAL;
switch (m_ptr->FKEY_REQUEST) { /* see what we must do */
case FKEY_MAP: /* request for new mapping */
result = OK; /* assume everything will be ok*/
for (i=0; i < 12; i++) { /* check F1-F12 keys */
if (bit_isset(m_ptr->FKEY_FKEYS, i+1) ) {
#if DEAD_CODE
/* Currently, we don't check if the slot is in use, so that IS
* can recover after a crash by overtaking its existing mappings.
* In future, a better solution will be implemented.
*/
if (fkey_obs[i].proc_nr == NONE) {
#endif
fkey_obs[i].proc_nr = m_ptr->m_source;
fkey_obs[i].events = 0;
bit_unset(m_ptr->FKEY_FKEYS, i+1);
#if DEAD_CODE
} else {
printf("WARNING, fkey_map failed F%d\n", i+1);
result = EBUSY; /* report failure, but try rest */
}
#endif
}
}
for (i=0; i < 12; i++) { /* check Shift+F1-F12 keys */
if (bit_isset(m_ptr->FKEY_SFKEYS, i+1) ) {
#if DEAD_CODE
if (sfkey_obs[i].proc_nr == NONE) {
#endif
sfkey_obs[i].proc_nr = m_ptr->m_source;
sfkey_obs[i].events = 0;
bit_unset(m_ptr->FKEY_SFKEYS, i+1);
#if DEAD_CODE
} else {
printf("WARNING, fkey_map failed Shift F%d\n", i+1);
result = EBUSY; /* report failure but try rest */
}
#endif
}
}
break;
case FKEY_UNMAP:
result = OK; /* assume everything will be ok*/
for (i=0; i < 12; i++) { /* check F1-F12 keys */
if (bit_isset(m_ptr->FKEY_FKEYS, i+1) ) {
if (fkey_obs[i].proc_nr == m_ptr->m_source) {
fkey_obs[i].proc_nr = NONE;
fkey_obs[i].events = 0;
bit_unset(m_ptr->FKEY_FKEYS, i+1);
} else {
result = EPERM; /* report failure, but try rest */
}
}
}
for (i=0; i < 12; i++) { /* check Shift+F1-F12 keys */
if (bit_isset(m_ptr->FKEY_SFKEYS, i+1) ) {
if (sfkey_obs[i].proc_nr == m_ptr->m_source) {
sfkey_obs[i].proc_nr = NONE;
sfkey_obs[i].events = 0;
bit_unset(m_ptr->FKEY_SFKEYS, i+1);
} else {
result = EPERM; /* report failure, but try rest */
}
}
}
break;
case FKEY_EVENTS:
m_ptr->FKEY_FKEYS = m_ptr->FKEY_SFKEYS = 0;
for (i=0; i < 12; i++) { /* check (Shift+) F1-F12 keys */
if (fkey_obs[i].proc_nr == m_ptr->m_source) {
if (fkey_obs[i].events) {
bit_set(m_ptr->FKEY_FKEYS, i+1);
fkey_obs[i].events = 0;
}
}
if (sfkey_obs[i].proc_nr == m_ptr->m_source) {
if (sfkey_obs[i].events) {
bit_set(m_ptr->FKEY_SFKEYS, i+1);
sfkey_obs[i].events = 0;
}
}
}
break;
}
/* Almost done, return result to caller. */
m_ptr->m_type = result;
send(m_ptr->m_source, m_ptr);
}
/*===========================================================================*
* func_key *
*===========================================================================*/
PRIVATE int func_key(scode)
int scode; /* scan code for a function key */
{
/* This procedure traps function keys for debugging purposes. Observers of
* function keys are kept in a global array. If a subject (a key) is pressed
* the observer is notified of the event. Initialization of the arrays is done
* in kb_init, where NONE is set to indicate there is no interest in the key.
* Returns FALSE on a key release or if the key is not observable.
*/
int key;
int proc_nr;
/* Ignore key releases. If this is a key press, get full key code. */
if (scode & KEY_RELEASE) return(FALSE); /* key release */
key = map_key(scode); /* include modifiers */
/* Key pressed, now see if there is an observer for the pressed key.
* F1-F12 observers are in fkey_obs array.
* SHIFT F1-F12 observers are in sfkey_req array.
* CTRL F1-F12 reserved (see kb_read)
* ALT F1-F12 reserved (see kb_read)
* Other combinations are not in use. Note that Alt+Shift+F1-F12 is yet
* defined in <minix/keymap.h>, and thus is easy for future extensions.
*/
if (F1 <= key && key <= F12) { /* F1-F12 */
proc_nr = fkey_obs[key - F1].proc_nr;
fkey_obs[key - F1].events ++ ;
} else if (SF1 <= key && key <= SF12) { /* Shift F2-F12 */
proc_nr = sfkey_obs[key - SF1].proc_nr;
sfkey_obs[key - SF1].events ++;
}
else {
return(FALSE); /* not observable */
}
/* See if an observer is registered and send it a message. */
if (proc_nr != NONE) {
notify(proc_nr);
}
return(TRUE);
}
/*===========================================================================*
* show_key_mappings *
*===========================================================================*/
PRIVATE void show_key_mappings()
{
int i,s;
struct proc proc;
printf("\n");
printf("System information. Known function key mappings to request debug dumps:\n");
printf("-------------------------------------------------------------------------\n");
for (i=0; i<12; i++) {
printf(" %sF%d: ", i+1<10? " ":"", i+1);
if (fkey_obs[i].proc_nr != NONE) {
if ((s = sys_getproc(&proc, fkey_obs[i].proc_nr))!=OK)
printf("%-14.14s", "<unknown>");
else
printf("%-14.14s", proc.p_name);
} else {
printf("%-14.14s", "<none>");
}
printf(" %sShift-F%d: ", i+1<10? " ":"", i+1);
if (sfkey_obs[i].proc_nr != NONE) {
if ((s = sys_getproc(&proc, sfkey_obs[i].proc_nr))!=OK)
printf("%-14.14s", "<unknown>");
else
printf("%-14.14s", proc.p_name);
} else {
printf("%-14.14s", "<none>");
}
printf("\n");
}
printf("\n");
printf("Press one of the registered function keys to trigger a debug dump.\n");
printf("\n");
}
/*===========================================================================*
* scan_keyboard *
*===========================================================================*/
PRIVATE int scan_keyboard(bp, isauxp)
unsigned char *bp;
int *isauxp;
{
unsigned long b, sb;
if(sys_inb(KB_STATUS, &sb) != OK)
printf("scan_keyboard: sys_inb failed\n");
if (!(sb & KB_OUT_FULL))
{
if (kbdout.avail && !kbdout.expect_ack)
kbd_send();
return 0;
}
if(sys_inb(KEYBD, &b) != OK)
printf("scan_keyboard: 2 sys_inb failed\n");
#if 0
printf("got byte 0x%x from %s\n", b, (sb & KB_AUX_BYTE) ? "AUX" : "keyboard");
#endif
if (!(sb & KB_AUX_BYTE) && b == KB_ACK && kbdout.expect_ack)
{
#if 0
printf("got ACK from keyboard\n");
#endif
kbdout.expect_ack= 0;
micro_delay(KBC_IN_DELAY);
kbd_send();
return 0;
}
if (bp)
*bp= b;
if (isauxp)
*isauxp= !!(sb & KB_AUX_BYTE);
if (kbdout.avail && !kbdout.expect_ack)
{
micro_delay(KBC_IN_DELAY);
kbd_send();
}
return 1;
}
/*===========================================================================*
* kbd_watchdog *
*===========================================================================*/
PRIVATE void kbd_watchdog(timer_t *UNUSED(tmrp))
{
kbd_watchdog_set= 0;
if (!kbdout.avail)
return; /* Watchdog is no longer needed */
if (!kbd_alive)
{
printf("kbd_watchdog: should reset keyboard\n");
}
kbd_alive= 0;
set_timer(&tmr_kbd_wd, system_hz, kbd_watchdog, 0);
kbd_watchdog_set= 1;
}
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