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minix/drivers/tty/console.c
Jorrit Herder 74711a3b14 Check if kernel calls is allowed (from process' call mask) added. Not yet 
enforced. If a call is denied, this will be kprinted. Please report any such
errors, so that I can adjust the mask before returning errors instead of
warnings.

Wrote CMOS driver. All CMOS code from FS has been removed. Currently the
driver only supports get time calls. Set time is left out as an exercise
for the book readers ... startup scripts were updated because the CMOS driver
is needed early on. (IS got same treatment.) Don't forget to run MAKEDEV cmos
in /dev/, otherwise the driver cannot be loaded.
2005-08-04 19:23:03 +00:00

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/* Code and data for the IBM console driver.
*
* The 6845 video controller used by the IBM PC shares its video memory with
* the CPU somewhere in the 0xB0000 memory bank. To the 6845 this memory
* consists of 16-bit words. Each word has a character code in the low byte
* and a so-called attribute byte in the high byte. The CPU directly modifies
* video memory to display characters, and sets two registers on the 6845 that
* specify the video origin and the cursor position. The video origin is the
* place in video memory where the first character (upper left corner) can
* be found. Moving the origin is a fast way to scroll the screen. Some
* video adapters wrap around the top of video memory, so the origin can
* move without bounds. For other adapters screen memory must sometimes be
* moved to reset the origin. All computations on video memory use character
* (word) addresses for simplicity and assume there is no wrapping. The
* assembly support functions translate the word addresses to byte addresses
* and the scrolling function worries about wrapping.
*/
#include "../drivers.h"
#include <termios.h>
#include <minix/callnr.h>
#include <minix/com.h>
#include "tty.h"
#include "../../kernel/const.h"
#include "../../kernel/config.h"
#include "../../kernel/type.h"
/* Definitions used by the console driver. */
#define MONO_BASE 0xB0000L /* base of mono video memory */
#define COLOR_BASE 0xB8000L /* base of color video memory */
#define MONO_SIZE 0x1000 /* 4K mono video memory */
#define COLOR_SIZE 0x4000 /* 16K color video memory */
#define EGA_SIZE 0x8000 /* EGA & VGA have at least 32K */
#define BLANK_COLOR 0x0700 /* determines cursor color on blank screen */
#define SCROLL_UP 0 /* scroll forward */
#define SCROLL_DOWN 1 /* scroll backward */
#define BLANK_MEM ((u16_t *) 0) /* tells mem_vid_copy() to blank the screen */
#define CONS_RAM_WORDS 80 /* video ram buffer size */
#define MAX_ESC_PARMS 4 /* number of escape sequence params allowed */
/* Constants relating to the controller chips. */
#define M_6845 0x3B4 /* port for 6845 mono */
#define C_6845 0x3D4 /* port for 6845 color */
#define INDEX 0 /* 6845's index register */
#define DATA 1 /* 6845's data register */
#define STATUS 6 /* 6845's status register */
#define VID_ORG 12 /* 6845's origin register */
#define CURSOR 14 /* 6845's cursor register */
/* Beeper. */
#define BEEP_FREQ 0x0533 /* value to put into timer to set beep freq */
#define B_TIME 3 /* length of CTRL-G beep is ticks */
/* definitions used for font management */
#define GA_SEQUENCER_INDEX 0x3C4
#define GA_SEQUENCER_DATA 0x3C5
#define GA_GRAPHICS_INDEX 0x3CE
#define GA_GRAPHICS_DATA 0x3CF
#define GA_VIDEO_ADDRESS 0xA0000L
#define GA_FONT_SIZE 8192
/* Global variables used by the console driver and assembly support. */
PUBLIC int vid_index; /* index of video segment in remote mem map */
PUBLIC u16_t vid_seg;
PUBLIC vir_bytes vid_off; /* video ram is found at vid_seg:vid_off */
PUBLIC unsigned vid_size; /* 0x2000 for color or 0x0800 for mono */
PUBLIC unsigned vid_mask; /* 0x1FFF for color or 0x07FF for mono */
PUBLIC unsigned blank_color = BLANK_COLOR; /* display code for blank */
/* Private variables used by the console driver. */
PRIVATE int vid_port; /* I/O port for accessing 6845 */
PRIVATE int wrap; /* hardware can wrap? */
PRIVATE int softscroll; /* 1 = software scrolling, 0 = hardware */
PRIVATE int beeping; /* speaker is beeping? */
PRIVATE unsigned font_lines; /* font lines per character */
PRIVATE unsigned scr_width; /* # characters on a line */
PRIVATE unsigned scr_lines; /* # lines on the screen */
PRIVATE unsigned scr_size; /* # characters on the screen */
/* Per console data. */
typedef struct console {
tty_t *c_tty; /* associated TTY struct */
int c_column; /* current column number (0-origin) */
int c_row; /* current row (0 at top of screen) */
int c_rwords; /* number of WORDS (not bytes) in outqueue */
unsigned c_start; /* start of video memory of this console */
unsigned c_limit; /* limit of this console's video memory */
unsigned c_org; /* location in RAM where 6845 base points */
unsigned c_cur; /* current position of cursor in video RAM */
unsigned c_attr; /* character attribute */
unsigned c_blank; /* blank attribute */
char c_reverse; /* reverse video */
char c_esc_state; /* 0=normal, 1=ESC, 2=ESC[ */
char c_esc_intro; /* Distinguishing character following ESC */
int *c_esc_parmp; /* pointer to current escape parameter */
int c_esc_parmv[MAX_ESC_PARMS]; /* list of escape parameters */
u16_t c_ramqueue[CONS_RAM_WORDS]; /* buffer for video RAM */
} console_t;
PRIVATE int nr_cons= 1; /* actual number of consoles */
PRIVATE console_t cons_table[NR_CONS];
PRIVATE console_t *curcons; /* currently visible */
/* Color if using a color controller. */
#define color (vid_port == C_6845)
/* Map from ANSI colors to the attributes used by the PC */
PRIVATE int ansi_colors[8] = {0, 4, 2, 6, 1, 5, 3, 7};
/* Structure used for font management */
struct sequence {
unsigned short index;
unsigned char port;
unsigned char value;
};
FORWARD _PROTOTYPE( int cons_write, (struct tty *tp, int try) );
FORWARD _PROTOTYPE( void cons_echo, (tty_t *tp, int c) );
FORWARD _PROTOTYPE( void out_char, (console_t *cons, int c) );
FORWARD _PROTOTYPE( void putk, (int c) );
FORWARD _PROTOTYPE( void beep, (void) );
FORWARD _PROTOTYPE( void do_escape, (console_t *cons, int c) );
FORWARD _PROTOTYPE( void flush, (console_t *cons) );
FORWARD _PROTOTYPE( void parse_escape, (console_t *cons, int c) );
FORWARD _PROTOTYPE( void scroll_screen, (console_t *cons, int dir) );
FORWARD _PROTOTYPE( void set_6845, (int reg, unsigned val) );
FORWARD _PROTOTYPE( void get_6845, (int reg, unsigned *val) );
FORWARD _PROTOTYPE( void stop_beep, (timer_t *tmrp) );
FORWARD _PROTOTYPE( void cons_org0, (void) );
FORWARD _PROTOTYPE( int ga_program, (struct sequence *seq) );
FORWARD _PROTOTYPE( int cons_ioctl, (tty_t *tp, int) );
/*===========================================================================*
* cons_write *
*===========================================================================*/
PRIVATE int cons_write(tp, try)
register struct tty *tp; /* tells which terminal is to be used */
int try;
{
/* Copy as much data as possible to the output queue, then start I/O. On
* memory-mapped terminals, such as the IBM console, the I/O will also be
* finished, and the counts updated. Keep repeating until all I/O done.
*/
int count;
int result;
register char *tbuf;
char buf[64];
console_t *cons = tp->tty_priv;
if(try) return 1; /* we can always write to console */
/* Check quickly for nothing to do, so this can be called often without
* unmodular tests elsewhere.
*/
if ((count = tp->tty_outleft) == 0 || tp->tty_inhibited) return;
/* Copy the user bytes to buf[] for decent addressing. Loop over the
* copies, since the user buffer may be much larger than buf[].
*/
do {
if (count > sizeof(buf)) count = sizeof(buf);
if ((result = sys_vircopy(tp->tty_outproc, D, tp->tty_out_vir,
SELF, D, (vir_bytes) buf, (vir_bytes) count)) != OK)
break;
tbuf = buf;
/* Update terminal data structure. */
tp->tty_out_vir += count;
tp->tty_outcum += count;
tp->tty_outleft -= count;
/* Output each byte of the copy to the screen. Avoid calling
* out_char() for the "easy" characters, put them into the buffer
* directly.
*/
do {
if ((unsigned) *tbuf < ' ' || cons->c_esc_state > 0
|| cons->c_column >= scr_width
|| cons->c_rwords >= buflen(cons->c_ramqueue))
{
out_char(cons, *tbuf++);
} else {
cons->c_ramqueue[cons->c_rwords++] =
cons->c_attr | (*tbuf++ & BYTE);
cons->c_column++;
}
} while (--count != 0);
} while ((count = tp->tty_outleft) != 0 && !tp->tty_inhibited);
flush(cons); /* transfer anything buffered to the screen */
/* Reply to the writer if all output is finished or if an error occured. */
if (tp->tty_outleft == 0 || result != OK) {
/* REVIVE is not possible. I/O on memory mapped consoles finishes. */
tty_reply(tp->tty_outrepcode, tp->tty_outcaller, tp->tty_outproc,
tp->tty_outcum);
tp->tty_outcum = 0;
}
}
/*===========================================================================*
* cons_echo *
*===========================================================================*/
PRIVATE void cons_echo(tp, c)
register tty_t *tp; /* pointer to tty struct */
int c; /* character to be echoed */
{
/* Echo keyboard input (print & flush). */
console_t *cons = tp->tty_priv;
out_char(cons, c);
flush(cons);
}
/*===========================================================================*
* out_char *
*===========================================================================*/
PRIVATE void out_char(cons, c)
register console_t *cons; /* pointer to console struct */
int c; /* character to be output */
{
/* Output a character on the console. Check for escape sequences first. */
if (cons->c_esc_state > 0) {
parse_escape(cons, c);
return;
}
switch(c) {
case 000: /* null is typically used for padding */
return; /* better not do anything */
case 007: /* ring the bell */
flush(cons); /* print any chars queued for output */
beep();
return;
case '\b': /* backspace */
if (--cons->c_column < 0) {
if (--cons->c_row >= 0) cons->c_column += scr_width;
}
flush(cons);
return;
case '\n': /* line feed */
if ((cons->c_tty->tty_termios.c_oflag & (OPOST|ONLCR))
== (OPOST|ONLCR)) {
cons->c_column = 0;
}
/*FALL THROUGH*/
case 013: /* CTRL-K */
case 014: /* CTRL-L */
if (cons->c_row == scr_lines-1) {
scroll_screen(cons, SCROLL_UP);
} else {
cons->c_row++;
}
flush(cons);
return;
case '\r': /* carriage return */
cons->c_column = 0;
flush(cons);
return;
case '\t': /* tab */
cons->c_column = (cons->c_column + TAB_SIZE) & ~TAB_MASK;
if (cons->c_column > scr_width) {
cons->c_column -= scr_width;
if (cons->c_row == scr_lines-1) {
scroll_screen(cons, SCROLL_UP);
} else {
cons->c_row++;
}
}
flush(cons);
return;
case 033: /* ESC - start of an escape sequence */
flush(cons); /* print any chars queued for output */
cons->c_esc_state = 1; /* mark ESC as seen */
return;
default: /* printable chars are stored in ramqueue */
if (cons->c_column >= scr_width) {
if (!LINEWRAP) return;
if (cons->c_row == scr_lines-1) {
scroll_screen(cons, SCROLL_UP);
} else {
cons->c_row++;
}
cons->c_column = 0;
flush(cons);
}
if (cons->c_rwords == buflen(cons->c_ramqueue)) flush(cons);
cons->c_ramqueue[cons->c_rwords++] = cons->c_attr | (c & BYTE);
cons->c_column++; /* next column */
return;
}
}
/*===========================================================================*
* scroll_screen *
*===========================================================================*/
PRIVATE void scroll_screen(cons, dir)
register console_t *cons; /* pointer to console struct */
int dir; /* SCROLL_UP or SCROLL_DOWN */
{
unsigned new_line, new_org, chars;
flush(cons);
chars = scr_size - scr_width; /* one screen minus one line */
/* Scrolling the screen is a real nuisance due to the various incompatible
* video cards. This driver supports software scrolling (Hercules?),
* hardware scrolling (mono and CGA cards) and hardware scrolling without
* wrapping (EGA cards). In the latter case we must make sure that
* c_start <= c_org && c_org + scr_size <= c_limit
* holds, because EGA doesn't wrap around the end of video memory.
*/
if (dir == SCROLL_UP) {
/* Scroll one line up in 3 ways: soft, avoid wrap, use origin. */
if (softscroll) {
vid_vid_copy(cons->c_start + scr_width, cons->c_start, chars);
} else
if (!wrap && cons->c_org + scr_size + scr_width >= cons->c_limit) {
vid_vid_copy(cons->c_org + scr_width, cons->c_start, chars);
cons->c_org = cons->c_start;
} else {
cons->c_org = (cons->c_org + scr_width) & vid_mask;
}
new_line = (cons->c_org + chars) & vid_mask;
} else {
/* Scroll one line down in 3 ways: soft, avoid wrap, use origin. */
if (softscroll) {
vid_vid_copy(cons->c_start, cons->c_start + scr_width, chars);
} else
if (!wrap && cons->c_org < cons->c_start + scr_width) {
new_org = cons->c_limit - scr_size;
vid_vid_copy(cons->c_org, new_org + scr_width, chars);
cons->c_org = new_org;
} else {
cons->c_org = (cons->c_org - scr_width) & vid_mask;
}
new_line = cons->c_org;
}
/* Blank the new line at top or bottom. */
blank_color = cons->c_blank;
mem_vid_copy(BLANK_MEM, new_line, scr_width);
/* Set the new video origin. */
if (cons == curcons) set_6845(VID_ORG, cons->c_org);
flush(cons);
}
/*===========================================================================*
* flush *
*===========================================================================*/
PRIVATE void flush(cons)
register console_t *cons; /* pointer to console struct */
{
/* Send characters buffered in 'ramqueue' to screen memory, check the new
* cursor position, compute the new hardware cursor position and set it.
*/
unsigned cur;
tty_t *tp = cons->c_tty;
/* Have the characters in 'ramqueue' transferred to the screen. */
if (cons->c_rwords > 0) {
mem_vid_copy(cons->c_ramqueue, cons->c_cur, cons->c_rwords);
cons->c_rwords = 0;
/* TTY likes to know the current column and if echoing messed up. */
tp->tty_position = cons->c_column;
tp->tty_reprint = TRUE;
}
/* Check and update the cursor position. */
if (cons->c_column < 0) cons->c_column = 0;
if (cons->c_column > scr_width) cons->c_column = scr_width;
if (cons->c_row < 0) cons->c_row = 0;
if (cons->c_row >= scr_lines) cons->c_row = scr_lines - 1;
cur = cons->c_org + cons->c_row * scr_width + cons->c_column;
if (cur != cons->c_cur) {
if (cons == curcons) set_6845(CURSOR, cur);
cons->c_cur = cur;
}
}
/*===========================================================================*
* parse_escape *
*===========================================================================*/
PRIVATE void parse_escape(cons, c)
register console_t *cons; /* pointer to console struct */
char c; /* next character in escape sequence */
{
/* The following ANSI escape sequences are currently supported.
* If n and/or m are omitted, they default to 1.
* ESC [nA moves up n lines
* ESC [nB moves down n lines
* ESC [nC moves right n spaces
* ESC [nD moves left n spaces
* ESC [m;nH" moves cursor to (m,n)
* ESC [J clears screen from cursor
* ESC [K clears line from cursor
* ESC [nL inserts n lines ar cursor
* ESC [nM deletes n lines at cursor
* ESC [nP deletes n chars at cursor
* ESC [n@ inserts n chars at cursor
* ESC [nm enables rendition n (0=normal, 4=bold, 5=blinking, 7=reverse)
* ESC M scrolls the screen backwards if the cursor is on the top line
*/
switch (cons->c_esc_state) {
case 1: /* ESC seen */
cons->c_esc_intro = '\0';
cons->c_esc_parmp = bufend(cons->c_esc_parmv);
do {
*--cons->c_esc_parmp = 0;
} while (cons->c_esc_parmp > cons->c_esc_parmv);
switch (c) {
case '[': /* Control Sequence Introducer */
cons->c_esc_intro = c;
cons->c_esc_state = 2;
break;
case 'M': /* Reverse Index */
do_escape(cons, c);
break;
default:
cons->c_esc_state = 0;
}
break;
case 2: /* ESC [ seen */
if (c >= '0' && c <= '9') {
if (cons->c_esc_parmp < bufend(cons->c_esc_parmv))
*cons->c_esc_parmp = *cons->c_esc_parmp * 10 + (c-'0');
} else
if (c == ';') {
if (cons->c_esc_parmp < bufend(cons->c_esc_parmv))
cons->c_esc_parmp++;
} else {
do_escape(cons, c);
}
break;
}
}
/*===========================================================================*
* do_escape *
*===========================================================================*/
PRIVATE void do_escape(cons, c)
register console_t *cons; /* pointer to console struct */
char c; /* next character in escape sequence */
{
int value, n;
unsigned src, dst, count;
int *parmp;
/* Some of these things hack on screen RAM, so it had better be up to date */
flush(cons);
if (cons->c_esc_intro == '\0') {
/* Handle a sequence beginning with just ESC */
switch (c) {
case 'M': /* Reverse Index */
if (cons->c_row == 0) {
scroll_screen(cons, SCROLL_DOWN);
} else {
cons->c_row--;
}
flush(cons);
break;
default: break;
}
} else
if (cons->c_esc_intro == '[') {
/* Handle a sequence beginning with ESC [ and parameters */
value = cons->c_esc_parmv[0];
switch (c) {
case 'A': /* ESC [nA moves up n lines */
n = (value == 0 ? 1 : value);
cons->c_row -= n;
flush(cons);
break;
case 'B': /* ESC [nB moves down n lines */
n = (value == 0 ? 1 : value);
cons->c_row += n;
flush(cons);
break;
case 'C': /* ESC [nC moves right n spaces */
n = (value == 0 ? 1 : value);
cons->c_column += n;
flush(cons);
break;
case 'D': /* ESC [nD moves left n spaces */
n = (value == 0 ? 1 : value);
cons->c_column -= n;
flush(cons);
break;
case 'H': /* ESC [m;nH" moves cursor to (m,n) */
cons->c_row = cons->c_esc_parmv[0] - 1;
cons->c_column = cons->c_esc_parmv[1] - 1;
flush(cons);
break;
case 'J': /* ESC [sJ clears in display */
switch (value) {
case 0: /* Clear from cursor to end of screen */
count = scr_size - (cons->c_cur - cons->c_org);
dst = cons->c_cur;
break;
case 1: /* Clear from start of screen to cursor */
count = cons->c_cur - cons->c_org;
dst = cons->c_org;
break;
case 2: /* Clear entire screen */
count = scr_size;
dst = cons->c_org;
break;
default: /* Do nothing */
count = 0;
dst = cons->c_org;
}
blank_color = cons->c_blank;
mem_vid_copy(BLANK_MEM, dst, count);
break;
case 'K': /* ESC [sK clears line from cursor */
switch (value) {
case 0: /* Clear from cursor to end of line */
count = scr_width - cons->c_column;
dst = cons->c_cur;
break;
case 1: /* Clear from beginning of line to cursor */
count = cons->c_column;
dst = cons->c_cur - cons->c_column;
break;
case 2: /* Clear entire line */
count = scr_width;
dst = cons->c_cur - cons->c_column;
break;
default: /* Do nothing */
count = 0;
dst = cons->c_cur;
}
blank_color = cons->c_blank;
mem_vid_copy(BLANK_MEM, dst, count);
break;
case 'L': /* ESC [nL inserts n lines at cursor */
n = value;
if (n < 1) n = 1;
if (n > (scr_lines - cons->c_row))
n = scr_lines - cons->c_row;
src = cons->c_org + cons->c_row * scr_width;
dst = src + n * scr_width;
count = (scr_lines - cons->c_row - n) * scr_width;
vid_vid_copy(src, dst, count);
blank_color = cons->c_blank;
mem_vid_copy(BLANK_MEM, src, n * scr_width);
break;
case 'M': /* ESC [nM deletes n lines at cursor */
n = value;
if (n < 1) n = 1;
if (n > (scr_lines - cons->c_row))
n = scr_lines - cons->c_row;
dst = cons->c_org + cons->c_row * scr_width;
src = dst + n * scr_width;
count = (scr_lines - cons->c_row - n) * scr_width;
vid_vid_copy(src, dst, count);
blank_color = cons->c_blank;
mem_vid_copy(BLANK_MEM, dst + count, n * scr_width);
break;
case '@': /* ESC [n@ inserts n chars at cursor */
n = value;
if (n < 1) n = 1;
if (n > (scr_width - cons->c_column))
n = scr_width - cons->c_column;
src = cons->c_cur;
dst = src + n;
count = scr_width - cons->c_column - n;
vid_vid_copy(src, dst, count);
blank_color = cons->c_blank;
mem_vid_copy(BLANK_MEM, src, n);
break;
case 'P': /* ESC [nP deletes n chars at cursor */
n = value;
if (n < 1) n = 1;
if (n > (scr_width - cons->c_column))
n = scr_width - cons->c_column;
dst = cons->c_cur;
src = dst + n;
count = scr_width - cons->c_column - n;
vid_vid_copy(src, dst, count);
blank_color = cons->c_blank;
mem_vid_copy(BLANK_MEM, dst + count, n);
break;
case 'm': /* ESC [nm enables rendition n */
for (parmp = cons->c_esc_parmv; parmp <= cons->c_esc_parmp
&& parmp < bufend(cons->c_esc_parmv); parmp++) {
if (cons->c_reverse) {
/* Unswap fg and bg colors */
cons->c_attr = ((cons->c_attr & 0x7000) >> 4) |
((cons->c_attr & 0x0700) << 4) |
((cons->c_attr & 0x8800));
}
switch (n = *parmp) {
case 0: /* NORMAL */
cons->c_attr = cons->c_blank = BLANK_COLOR;
cons->c_reverse = FALSE;
break;
case 1: /* BOLD */
/* Set intensity bit */
cons->c_attr |= 0x0800;
break;
case 4: /* UNDERLINE */
if (color) {
/* Change white to cyan, i.e. lose red
*/
cons->c_attr = (cons->c_attr & 0xBBFF);
} else {
/* Set underline attribute */
cons->c_attr = (cons->c_attr & 0x99FF);
}
break;
case 5: /* BLINKING */
/* Set the blink bit */
cons->c_attr |= 0x8000;
break;
case 7: /* REVERSE */
cons->c_reverse = TRUE;
break;
default: /* COLOR */
if (n == 39) n = 37; /* set default color */
if (n == 49) n = 40;
if (!color) {
/* Don't mess up a monochrome screen */
} else
if (30 <= n && n <= 37) {
/* Foreground color */
cons->c_attr =
(cons->c_attr & 0xF8FF) |
(ansi_colors[(n - 30)] << 8);
cons->c_blank =
(cons->c_blank & 0xF8FF) |
(ansi_colors[(n - 30)] << 8);
} else
if (40 <= n && n <= 47) {
/* Background color */
cons->c_attr =
(cons->c_attr & 0x8FFF) |
(ansi_colors[(n - 40)] << 12);
cons->c_blank =
(cons->c_blank & 0x8FFF) |
(ansi_colors[(n - 40)] << 12);
}
}
if (cons->c_reverse) {
/* Swap fg and bg colors */
cons->c_attr = ((cons->c_attr & 0x7000) >> 4) |
((cons->c_attr & 0x0700) << 4) |
((cons->c_attr & 0x8800));
}
}
break;
}
}
cons->c_esc_state = 0;
}
/*===========================================================================*
* set_6845 *
*===========================================================================*/
PRIVATE void set_6845(reg, val)
int reg; /* which register pair to set */
unsigned val; /* 16-bit value to set it to */
{
/* Set a register pair inside the 6845.
* Registers 12-13 tell the 6845 where in video ram to start
* Registers 14-15 tell the 6845 where to put the cursor
*/
pvb_pair_t char_out[4];
pv_set(char_out[0], vid_port + INDEX, reg); /* set index register */
pv_set(char_out[1], vid_port + DATA, (val>>8) & BYTE); /* high byte */
pv_set(char_out[2], vid_port + INDEX, reg + 1); /* again */
pv_set(char_out[3], vid_port + DATA, val&BYTE); /* low byte */
sys_voutb(char_out, 4); /* do actual output */
}
/*===========================================================================*
* get_6845 *
*===========================================================================*/
PRIVATE void get_6845(reg, val)
int reg; /* which register pair to set */
unsigned *val; /* 16-bit value to set it to */
{
char v1, v2;
/* Get a register pair inside the 6845. */
sys_outb(vid_port + INDEX, reg);
sys_inb(vid_port + DATA, &v1);
sys_outb(vid_port + INDEX, reg+1);
sys_inb(vid_port + DATA, &v2);
*val = (v1 << 8) | v2;
}
/*===========================================================================*
* beep *
*===========================================================================*/
PRIVATE void beep()
{
/* Making a beeping sound on the speaker (output for CRTL-G).
* This routine works by turning on the bits 0 and 1 in port B of the 8255
* chip that drive the speaker.
*/
static timer_t tmr_stop_beep;
pvb_pair_t char_out[3];
clock_t now;
int port_b_val, s;
/* Fetch current time in advance to prevent beeping delay. */
if ((s=getuptime(&now)) != OK)
panic("TTY","Console couldn't get clock's uptime.", s);
if (!beeping) {
/* Set timer channel 2, square wave, with given frequency. */
pv_set(char_out[0], TIMER_MODE, 0xB6);
pv_set(char_out[1], TIMER2, (BEEP_FREQ >> 0) & BYTE);
pv_set(char_out[2], TIMER2, (BEEP_FREQ >> 8) & BYTE);
if (sys_voutb(char_out, 3)==OK) {
if (sys_inb(PORT_B, &port_b_val)==OK &&
sys_outb(PORT_B, (port_b_val|3))==OK)
beeping = TRUE;
}
}
/* Add a timer to the timers list. Possibly reschedule the alarm. */
tmrs_settimer(&tty_timers, &tmr_stop_beep, now+B_TIME, stop_beep, NULL);
if (tty_timers->tmr_exp_time != tty_next_timeout) {
tty_next_timeout = tty_timers->tmr_exp_time;
if ((s=sys_setalarm(tty_next_timeout, 1)) != OK)
panic("TTY","Console couldn't set alarm.", s);
}
}
/*===========================================================================*
* stop_beep *
*===========================================================================*/
PRIVATE void stop_beep(tmrp)
timer_t *tmrp;
{
/* Turn off the beeper by turning off bits 0 and 1 in PORT_B. */
int port_b_val;
if (sys_inb(PORT_B, &port_b_val)==OK &&
sys_outb(PORT_B, (port_b_val & ~3))==OK)
beeping = FALSE;
}
/*===========================================================================*
* scr_init *
*===========================================================================*/
PUBLIC void scr_init(tp)
tty_t *tp;
{
/* Initialize the screen driver. */
console_t *cons;
phys_bytes vid_base;
u16_t bios_columns, bios_crtbase, bios_fontlines;
u8_t bios_rows;
int line;
int s;
static int vdu_initialized = 0;
unsigned page_size;
/* Associate console and TTY. */
line = tp - &tty_table[0];
if (line >= nr_cons) return;
cons = &cons_table[line];
cons->c_tty = tp;
tp->tty_priv = cons;
/* Initialize the keyboard driver. */
kb_init(tp);
/* Fill in TTY function hooks. */
tp->tty_devwrite = cons_write;
tp->tty_echo = cons_echo;
tp->tty_ioctl = cons_ioctl;
/* Get the BIOS parameters that describe the VDU. */
if (! vdu_initialized++) {
/* How about error checking? What to do on failure??? */
s=sys_vircopy(SELF, BIOS_SEG, (vir_bytes) VDU_SCREEN_COLS_ADDR,
SELF, D, (vir_bytes) &bios_columns, VDU_SCREEN_COLS_SIZE);
s=sys_vircopy(SELF, BIOS_SEG, (vir_bytes) VDU_CRT_BASE_ADDR,
SELF, D, (vir_bytes) &bios_crtbase, VDU_CRT_BASE_SIZE);
s=sys_vircopy(SELF, BIOS_SEG, (vir_bytes) VDU_SCREEN_ROWS_ADDR,
SELF, D, (vir_bytes) &bios_rows, VDU_SCREEN_ROWS_SIZE);
s=sys_vircopy(SELF, BIOS_SEG, (vir_bytes) VDU_FONTLINES_ADDR,
SELF, D, (vir_bytes) &bios_fontlines, VDU_FONTLINES_SIZE);
vid_port = bios_crtbase;
scr_width = bios_columns;
font_lines = bios_fontlines;
scr_lines = machine.vdu_ega ? bios_rows+1 : 25;
if (color) {
vid_base = COLOR_BASE;
vid_size = COLOR_SIZE;
} else {
vid_base = MONO_BASE;
vid_size = MONO_SIZE;
}
if (machine.vdu_ega) vid_size = EGA_SIZE;
wrap = ! machine.vdu_ega;
s = sys_segctl(&vid_index, &vid_seg, &vid_off, vid_base, vid_size);
vid_size >>= 1; /* word count */
vid_mask = vid_size - 1;
/* Size of the screen (number of displayed characters.) */
scr_size = scr_lines * scr_width;
/* There can be as many consoles as video memory allows. */
nr_cons = vid_size / scr_size;
if (nr_cons > NR_CONS) nr_cons = NR_CONS;
if (nr_cons > 1) wrap = 0;
page_size = vid_size / nr_cons;
}
cons->c_start = line * page_size;
cons->c_limit = cons->c_start + page_size;
cons->c_cur = cons->c_org = cons->c_start;
cons->c_attr = cons->c_blank = BLANK_COLOR;
if(line != 0) {
/* Clear the non-console vtys. */
blank_color = BLANK_COLOR;
mem_vid_copy(BLANK_MEM, cons->c_start, scr_size);
} else {
int i, n;
/* Set the cursor of the console vty at the bottom. c_cur
* is updated automatically later.
*/
scroll_screen(cons, SCROLL_UP);
cons->c_row = scr_lines - 1;
cons->c_column = 0;
}
select_console(0);
cons_ioctl(tp, 0);
}
/*==========================================================================*
* kputc *
*==========================================================================*/
PUBLIC void kputc(c)
int c;
{
putk(c);
}
/*==========================================================================*
* do_new_kmess *
*==========================================================================*/
PUBLIC void do_new_kmess(m)
message *m;
{
/* Notification for a new kernel message. */
struct kmessages kmess; /* kmessages structure */
static int prev_next = 0; /* previous next seen */
int size, next;
int bytes;
int r;
/* Try to get a fresh copy of the buffer with kernel messages. */
#if DEAD_CODE
/* During shutdown, the reply is garbled because new notifications arrive
* while the system task makes a copy of the kernel messages buffer.
* Hence, don't check the return value.
*/
if ((r=sys_getkmessages(&kmess)) != OK) {
printf("TTY: couldn't get copy of kmessages: %d, 0x%x\n", r,r);
return;
}
#endif
sys_getkmessages(&kmess);
/* Print only the new part. Determine how many new bytes there are with
* help of the current and previous 'next' index. Note that the kernel
* buffer is circular. This works fine if less then KMESS_BUF_SIZE bytes
* is new data; else we miss % KMESS_BUF_SIZE here.
* Check for size being positive, the buffer might as well be emptied!
*/
if (kmess.km_size > 0) {
bytes = ((kmess.km_next + KMESS_BUF_SIZE) - prev_next) % KMESS_BUF_SIZE;
r=prev_next; /* start at previous old */
while (bytes > 0) {
putk( kmess.km_buf[(r%KMESS_BUF_SIZE)] );
bytes --;
r ++;
}
putk(0); /* terminate to flush output */
}
/* Almost done, store 'next' so that we can determine what part of the
* kernel messages buffer to print next time a notification arrives.
*/
prev_next = kmess.km_next;
}
/*==========================================================================*
* do_diagnostics *
*==========================================================================*/
PUBLIC void do_diagnostics(m_ptr)
message *m_ptr; /* pointer to request message */
{
/* Print a string for a server. */
char c;
vir_bytes src;
int count;
int result = OK;
int proc_nr = m_ptr->DIAG_PROC_NR;
if (proc_nr == SELF) proc_nr = m_ptr->m_source;
src = (vir_bytes) m_ptr->DIAG_PRINT_BUF;
for (count = m_ptr->DIAG_BUF_COUNT; count > 0; count--) {
if (sys_vircopy(proc_nr, D, src++, SELF, D, (vir_bytes) &c, 1) != OK) {
result = EFAULT;
break;
}
putk(c);
}
putk(0); /* always terminate, even with EFAULT */
m_ptr->m_type = result;
send(m_ptr->m_source, m_ptr);
}
/*===========================================================================*
* putk *
*===========================================================================*/
PRIVATE void putk(c)
int c; /* character to print */
{
/* This procedure is used by the version of printf() that is linked with
* the TTY driver. The one in the library sends a message to FS, which is
* not what is needed for printing within the TTY. This version just queues
* the character and starts the output.
*/
if (c != 0) {
if (c == '\n') putk('\r');
out_char(&cons_table[0], (int) c);
} else {
flush(&cons_table[0]);
}
}
/*===========================================================================*
* toggle_scroll *
*===========================================================================*/
PUBLIC void toggle_scroll()
{
/* Toggle between hardware and software scroll. */
cons_org0();
softscroll = !softscroll;
printf("%sware scrolling enabled.\n", softscroll ? "Soft" : "Hard");
}
/*===========================================================================*
* cons_stop *
*===========================================================================*/
PUBLIC void cons_stop()
{
/* Prepare for halt or reboot. */
cons_org0();
softscroll = 1;
select_console(0);
cons_table[0].c_attr = cons_table[0].c_blank = BLANK_COLOR;
}
/*===========================================================================*
* cons_org0 *
*===========================================================================*/
PRIVATE void cons_org0()
{
/* Scroll video memory back to put the origin at 0. */
int cons_line;
console_t *cons;
unsigned n;
for (cons_line = 0; cons_line < nr_cons; cons_line++) {
cons = &cons_table[cons_line];
while (cons->c_org > cons->c_start) {
n = vid_size - scr_size; /* amount of unused memory */
if (n > cons->c_org - cons->c_start)
n = cons->c_org - cons->c_start;
vid_vid_copy(cons->c_org, cons->c_org - n, scr_size);
cons->c_org -= n;
}
flush(cons);
}
select_console(ccurrent);
}
/*===========================================================================*
* select_console *
*===========================================================================*/
PUBLIC void select_console(int cons_line)
{
/* Set the current console to console number 'cons_line'. */
if (cons_line < 0 || cons_line >= nr_cons) return;
ccurrent = cons_line;
curcons = &cons_table[cons_line];
set_6845(VID_ORG, curcons->c_org);
set_6845(CURSOR, curcons->c_cur);
}
/*===========================================================================*
* con_loadfont *
*===========================================================================*/
PUBLIC int con_loadfont(m)
message *m;
{
/* Load a font into the EGA or VGA adapter. */
int result;
static struct sequence seq1[7] = {
{ GA_SEQUENCER_INDEX, 0x00, 0x01 },
{ GA_SEQUENCER_INDEX, 0x02, 0x04 },
{ GA_SEQUENCER_INDEX, 0x04, 0x07 },
{ GA_SEQUENCER_INDEX, 0x00, 0x03 },
{ GA_GRAPHICS_INDEX, 0x04, 0x02 },
{ GA_GRAPHICS_INDEX, 0x05, 0x00 },
{ GA_GRAPHICS_INDEX, 0x06, 0x00 },
};
static struct sequence seq2[7] = {
{ GA_SEQUENCER_INDEX, 0x00, 0x01 },
{ GA_SEQUENCER_INDEX, 0x02, 0x03 },
{ GA_SEQUENCER_INDEX, 0x04, 0x03 },
{ GA_SEQUENCER_INDEX, 0x00, 0x03 },
{ GA_GRAPHICS_INDEX, 0x04, 0x00 },
{ GA_GRAPHICS_INDEX, 0x05, 0x10 },
{ GA_GRAPHICS_INDEX, 0x06, 0 },
};
seq2[6].value= color ? 0x0E : 0x0A;
if (!machine.vdu_ega) return(ENOTTY);
result = ga_program(seq1); /* bring font memory into view */
result = sys_physcopy(m->PROC_NR, D, (vir_bytes) m->ADDRESS,
NONE, PHYS_SEG, (phys_bytes) GA_VIDEO_ADDRESS, (phys_bytes)GA_FONT_SIZE);
result = ga_program(seq2); /* restore */
return(result);
}
/*===========================================================================*
* ga_program *
*===========================================================================*/
PRIVATE int ga_program(seq)
struct sequence *seq;
{
pvb_pair_t char_out[14];
int i;
for (i=0; i<7; i++) {
pv_set(char_out[2*i], seq->index, seq->port);
pv_set(char_out[2*i+1], seq->index+1, seq->value);
seq++;
}
return sys_voutb(char_out, 14);
}
/*===========================================================================*
* cons_ioctl *
*===========================================================================*/
PRIVATE int cons_ioctl(tp, try)
tty_t *tp;
int try;
{
/* Set the screen dimensions. */
tp->tty_winsize.ws_row= scr_lines;
tp->tty_winsize.ws_col= scr_width;
tp->tty_winsize.ws_xpixel= scr_width * 8;
tp->tty_winsize.ws_ypixel= scr_lines * font_lines;
}
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