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phunix/drivers/tty/tty.h
David van Moolenbroek 6b3f4dc157 Input infrastructure, INPUT server, PCKBD driver 
This commit separates the low-level keyboard driver from TTY, putting
it in a separate driver (PCKBD). The commit also separates management
of raw input devices from TTY, and puts it in a separate server
(INPUT). All keyboard and mouse input from hardware is sent by drivers
to the INPUT server, which either sends it to a process that has
opened a raw input device, or otherwise forwards it to TTY for
standard processing.

Design by Dirk Vogt. Prototype by Uli Kastlunger.

Additional changes made to the prototype:

- the event communication is now based on USB HID codes; all input
  drivers have to use USB codes to describe events;
- all TTY keymaps have been converted to USB format, with the effect
  that a single keymap covers all keys; there is no (static) escaped
  keymap anymore;
- further keymap tweaks now allow remapping of literally all keys;
- input device renumbering and protocol rewrite;
- INPUT server rewrite, with added support for cancel and select;
- PCKBD reimplementation, including PC/AT-to-USB translation;
- support for manipulating keyboard LEDs has been added;
- keyboard and mouse multiplexer devices have been added to INPUT,
  primarily so that an X server need only open two devices;
- a new "libinputdriver" library abstracts away protocol details from
  input drivers, and should be used by all future input drivers;
- both INPUT and PCKBD can be restarted;
- TTY is now scheduled by KERNEL, so that it won't be punished for
  running a lot; without this, simply running "yes" on the console
  kills the system;
- the KIOCBELL IOCTL has been moved to /dev/console;
- support for the SCANCODES termios setting has been removed;
- obsolete keymap compression has been removed;
- the obsolete Olivetti M24 keymap has been removed.

Change-Id: I3a672fb8c4fd566734e4b46d3994b4b7fc96d578
2014-03-01 09:04:55 +01:00

162 lines
6.4 KiB
C
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/* tty.h - Terminals */
#include <minix/chardriver.h>
#include <minix/timers.h>
/* First minor numbers for the various classes of TTY devices. */
#define CONS_MINOR 0
#define LOG_MINOR 15
#define RS232_MINOR 16
#define VIDEO_MINOR 125
#define TTYPX_MINOR 128
#define PTYPX_MINOR 192
#define CONS_ARG 30 /* console= boot param length (incl. nul) */
#define LINEWRAP 1 /* console.c - wrap lines at column 80 */
#define TTY_IN_BYTES 256 /* tty input queue size */
#define TAB_SIZE 8 /* distance between tab stops */
#define TAB_MASK 7 /* mask to compute a tab stop position */
#define ESC '\33' /* escape */
struct tty;
typedef int(*devfun_t) (struct tty *tp, int try_only);
typedef void(*devfunarg_t) (struct tty *tp, int c);
typedef struct tty {
int tty_events; /* set when TTY should inspect this line */
int tty_index; /* index into TTY table */
devminor_t tty_minor; /* device minor number */
/* Input queue. Typed characters are stored here until read by a program. */
u16_t *tty_inhead; /* pointer to place where next char goes */
u16_t *tty_intail; /* pointer to next char to be given to prog */
int tty_incount; /* # chars in the input queue */
int tty_eotct; /* number of "line breaks" in input queue */
devfun_t tty_devread; /* routine to read from low level buffers */
devfun_t tty_icancel; /* cancel any device input */
int tty_min; /* minimum requested #chars in input queue */
minix_timer_t tty_tmr; /* the timer for this tty */
/* Output section. */
devfun_t tty_devwrite; /* routine to start actual device output */
devfunarg_t tty_echo; /* routine to echo characters input */
devfun_t tty_ocancel; /* cancel any ongoing device output */
devfun_t tty_break; /* let the device send a break */
/* Terminal parameters and status. */
int tty_position; /* current position on the screen for echoing */
char tty_reprint; /* 1 when echoed input messed up, else 0 */
char tty_escaped; /* 1 when LNEXT (^V) just seen, else 0 */
char tty_inhibited; /* 1 when STOP (^S) just seen (stops output) */
endpoint_t tty_pgrp; /* endpoint of controlling process */
char tty_openct; /* count of number of opens of this tty */
/* Information about incomplete I/O requests is stored here. */
endpoint_t tty_incaller; /* process that made the call, or NONE */
cdev_id_t tty_inid; /* ID of suspended read request */
cp_grant_id_t tty_ingrant; /* grant where data is to go */
size_t tty_inleft; /* how many chars are still needed */
size_t tty_incum; /* # chars input so far */
endpoint_t tty_outcaller; /* process that made the call, or NONE */
cdev_id_t tty_outid; /* ID of suspended write request */
cp_grant_id_t tty_outgrant; /* grant where data comes from */
size_t tty_outleft; /* # chars yet to be output */
size_t tty_outcum; /* # chars output so far */
endpoint_t tty_iocaller; /* process that made the call, or NONE */
cdev_id_t tty_ioid; /* ID of suspended ioctl request */
unsigned int tty_ioreq; /* ioctl request code */
cp_grant_id_t tty_iogrant; /* virtual address of ioctl buffer or grant */
/* select() data */
unsigned int tty_select_ops; /* which operations are interesting */
endpoint_t tty_select_proc; /* which process wants notification */
devminor_t tty_select_minor; /* minor used to start select query */
/* Miscellaneous. */
devfun_t tty_ioctl; /* set line speed, etc. at the device level */
devfun_t tty_open; /* tell the device that the tty is opened */
devfun_t tty_close; /* tell the device that the tty is closed */
void *tty_priv; /* pointer to per device private data */
struct termios tty_termios; /* terminal attributes */
struct winsize tty_winsize; /* window size (#lines and #columns) */
u16_t tty_inbuf[TTY_IN_BYTES];/* tty input buffer */
} tty_t;
/* Memory allocated in tty.c, so extern here. */
extern tty_t tty_table[NR_CONS+NR_RS_LINES+NR_PTYS];
extern int ccurrent; /* currently visible console */
extern u32_t system_hz; /* system clock frequency */
extern unsigned long kbd_irq_set;
extern unsigned long rs_irq_set;
/* Values for the fields. */
#define NOT_ESCAPED 0 /* previous character is not LNEXT (^V) */
#define ESCAPED 1 /* previous character was LNEXT (^V) */
#define RUNNING 0 /* no STOP (^S) has been typed to stop output */
#define STOPPED 1 /* STOP (^S) has been typed to stop output */
/* Fields and flags on characters in the input queue. */
#define IN_CHAR 0x00FF /* low 8 bits are the character itself */
#define IN_LEN 0x0F00 /* length of char if it has been echoed */
#define IN_LSHIFT 8 /* length = (c & IN_LEN) >> IN_LSHIFT */
#define IN_EOT 0x1000 /* char is a line break (^D, LF) */
#define IN_EOF 0x2000 /* char is EOF (^D), do not return to user */
#define IN_ESC 0x4000 /* escaped by LNEXT (^V), no interpretation */
/* Times and timeouts. */
#define force_timeout() ((void) (0))
/* Number of elements and limit of a buffer. */
#define buflen(buf) (sizeof(buf) / sizeof((buf)[0]))
#define bufend(buf) ((buf) + buflen(buf))
/* Memory allocated in tty.c, so extern here. */
extern struct machine machine; /* machine information (a.o.: pc_at, ega) */
/* The tty outputs diagnostic messages in a circular buffer. */
extern struct kmessages kmess;
/* Function prototypes for TTY driver. */
/* tty.c */
void handle_events(struct tty *tp);
void sigchar(struct tty *tp, int sig, int mayflush);
void tty_task(void);
tty_t *line2tty(devminor_t minor);
int in_process(struct tty *tp, char *buf, int count);
void out_process(struct tty *tp, char *bstart, char *bpos, char *bend,
int *icount, int *ocount);
void tty_wakeup(clock_t now);
int select_try(struct tty *tp, int ops);
int select_retry(struct tty *tp);
/* rs232.c */
void rs_init(struct tty *tp);
void rs_interrupt(message *m);
/* console.c */
void kputc(int c);
void cons_stop(void);
void scr_init(struct tty *tp);
void toggle_scroll(void);
int con_loadfont(endpoint_t endpt, cp_grant_id_t grant);
void select_console(int cons_line);
void beep_x( unsigned freq, clock_t dur);
void do_video(message *m, int ipc_status);
/* keyboard.c */
void kb_init(struct tty *tp);
void kb_init_once(void);
int kbd_loadmap(endpoint_t endpt, cp_grant_id_t grant);
void do_fkey_ctl(message *m);
void do_input(message *m);
/* pty.c */
void do_pty(message *m_ptr, int ipc_status);
void pty_init(struct tty *tp);
void select_retry_pty(struct tty *tp);
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