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loader: bring back old text-only video console

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Bring back vidconsole.c as textvidc.c from 2a0e2c88db. This console
does no graphics stuff at all, supports no fancy logos, has known bugs
in the terminal emulation, etc. However, it is small. It will be a
build-time option to select between the two. The BIOS loader is running
out of space when too many options are selected, so this allows people
to select the smaller one to spend the space elsewhere. This is only the
verbatim copy of the old vidconsole.c. It's not yet connected to the
build.

Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D43911
This commit is contained in:
Warner Losh 2024-02-17 23:14:44 -07:00
parent 6255c67c3d
commit 1954e5c1dc
1 changed files with 645 additions and 0 deletions
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645
stand/i386/libi386/textvidc.c Normal file
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@ -0,0 +1,645 @@
/*-
* Copyright (c) 1998 Michael Smith (msmith@freebsd.org)
* Copyright (c) 1997 Kazutaka YOKOTA (yokota@zodiac.mech.utsunomiya-u.ac.jp)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Id: probe_keyboard.c,v 1.13 1997/06/09 05:10:55 bde Exp
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stand.h>
#include <bootstrap.h>
#include <btxv86.h>
#include <machine/psl.h>
#include "libi386.h"
#if KEYBOARD_PROBE
#include <machine/cpufunc.h>
static int probe_keyboard(void);
#endif
static void vidc_probe(struct console *cp);
static int vidc_init(int arg);
static void vidc_putchar(int c);
static int vidc_getchar(void);
static int vidc_ischar(void);
static int vidc_started;
void get_pos(int *x, int *y);
#ifdef TERM_EMU
#define MAXARGS 8
#define DEFAULT_FGCOLOR 7
#define DEFAULT_BGCOLOR 0
void end_term(void);
void bail_out(int c);
void vidc_term_emu(int c);
void curs_move(int *_x, int *_y, int x, int y);
void write_char(int c, int fg, int bg);
void scroll_up(int rows, int fg, int bg);
void CD(void);
void CM(void);
void HO(void);
static int args[MAXARGS], argc;
static int fg_c, bg_c, curx, cury;
static int esc;
#endif
struct console textvidc = {
"vidconsole",
"internal video/keyboard",
0,
vidc_probe,
vidc_init,
vidc_putchar,
vidc_getchar,
vidc_ischar
};
static void
vidc_probe(struct console *cp)
{
/* look for a keyboard */
#if KEYBOARD_PROBE
if (probe_keyboard())
#endif
{
cp->c_flags |= C_PRESENTIN;
}
/* XXX for now, always assume we can do BIOS screen output */
cp->c_flags |= C_PRESENTOUT;
}
static int
vidc_init(int arg)
{
int i;
if (vidc_started && arg == 0)
return (0);
vidc_started = 1;
#ifdef TERM_EMU
/* Init terminal emulator */
end_term();
get_pos(&curx, &cury);
curs_move(&curx, &cury, curx, cury);
fg_c = DEFAULT_FGCOLOR;
bg_c = DEFAULT_BGCOLOR;
#endif
for (i = 0; i < 10 && vidc_ischar(); i++)
(void)vidc_getchar();
return (0); /* XXX reinit? */
}
static void
vidc_biosputchar(int c)
{
v86.ctl = 0;
v86.addr = 0x10;
v86.eax = 0xe00 | (c & 0xff);
v86.ebx = 0x7;
v86int();
}
static void
vidc_rawputchar(int c)
{
int i;
if (c == '\t') {
int n;
#ifndef TERM_EMU
int curx, cury;
get_pos(&curx, &cury);
#endif
n = 8 - ((curx + 8) % 8);
for (i = 0; i < n; i++)
vidc_rawputchar(' ');
} else {
#ifndef TERM_EMU
vidc_biosputchar(c);
#else
/* Emulate AH=0eh (teletype output) */
switch(c) {
case '\a':
vidc_biosputchar(c);
return;
case '\r':
curx = 0;
curs_move(&curx, &cury, curx, cury);
return;
case '\n':
cury++;
if (cury > 24) {
scroll_up(1, fg_c, bg_c);
cury--;
} else {
curs_move(&curx, &cury, curx, cury);
}
return;
case '\b':
if (curx > 0) {
curx--;
curs_move(&curx, &cury, curx, cury);
/* write_char(' ', fg_c, bg_c); XXX destructive(!) */
return;
}
return;
default:
write_char(c, fg_c, bg_c);
curx++;
if (curx > 79) {
curx = 0;
cury++;
}
if (cury > 24) {
curx = 0;
scroll_up(1, fg_c, bg_c);
cury--;
}
}
curs_move(&curx, &cury, curx, cury);
#endif
}
}
/* Get cursor position on the screen. Result is in edx. Sets
* curx and cury appropriately.
*/
void
get_pos(int *x, int *y)
{
v86.ctl = 0;
v86.addr = 0x10;
v86.eax = 0x0300;
v86.ebx = 0x0;
v86int();
*x = v86.edx & 0x00ff;
*y = (v86.edx & 0xff00) >> 8;
}
#ifdef TERM_EMU
/* Move cursor to x rows and y cols (0-based). */
void
curs_move(int *_x, int *_y, int x, int y)
{
v86.ctl = 0;
v86.addr = 0x10;
v86.eax = 0x0200;
v86.ebx = 0x0;
v86.edx = ((0x00ff & y) << 8) + (0x00ff & x);
v86int();
*_x = x;
*_y = y;
/* If there is ctrl char at this position, cursor would be invisible.
* Make it a space instead.
*/
v86.ctl = 0;
v86.addr = 0x10;
v86.eax = 0x0800;
v86.ebx = 0x0;
v86int();
#define isvisible(c) (((c) >= 32) && ((c) < 255))
if (!isvisible(v86.eax & 0x00ff)) {
write_char(' ', fg_c, bg_c);
}
}
/* Scroll up the whole window by a number of rows. If rows==0,
* clear the window. fg and bg are attributes for the new lines
* inserted in the window.
*/
void
scroll_up(int rows, int fgcol, int bgcol)
{
if (rows == 0)
rows = 25;
v86.ctl = 0;
v86.addr = 0x10;
v86.eax = 0x0600 + (0x00ff & rows);
v86.ebx = (bgcol << 12) + (fgcol << 8);
v86.ecx = 0x0;
v86.edx = 0x184f;
v86int();
}
/* Write character and attribute at cursor position. */
void
write_char(int c, int fgcol, int bgcol)
{
v86.ctl = 0;
v86.addr = 0x10;
v86.eax = 0x0900 + (0x00ff & c);
v86.ebx = (bgcol << 4) + fgcol;
v86.ecx = 0x1;
v86int();
}
/**************************************************************/
/*
* Screen manipulation functions. They use accumulated data in
* args[] and argc variables.
*
*/
/* Clear display from current position to end of screen */
void
CD(void)
{
get_pos(&curx, &cury);
if (curx > 0) {
v86.ctl = 0;
v86.addr = 0x10;
v86.eax = 0x0600;
v86.ebx = (bg_c << 4) + fg_c;
v86.ecx = (cury << 8) + curx;
v86.edx = (cury << 8) + 79;
v86int();
if (++cury > 24) {
end_term();
return;
}
}
v86.ctl = 0;
v86.addr = 0x10;
v86.eax = 0x0600;
v86.ebx = (bg_c << 4) + fg_c;
v86.ecx = (cury << 8) + 0;
v86.edx = (24 << 8) + 79;
v86int();
end_term();
}
/* Absolute cursor move to args[0] rows and args[1] columns
* (the coordinates are 1-based).
*/
void
CM(void)
{
if (args[0] > 0)
args[0]--;
if (args[1] > 0)
args[1]--;
curs_move(&curx, &cury, args[1], args[0]);
end_term();
}
/* Home cursor (left top corner) */
void
HO(void)
{
argc = 1;
args[0] = args[1] = 1;
CM();
}
/* Clear internal state of the terminal emulation code */
void
end_term(void)
{
esc = 0;
argc = -1;
}
/* Gracefully exit ESC-sequence processing in case of misunderstanding */
void
bail_out(int c)
{
char buf[16], *ch;
int i;
if (esc) {
vidc_rawputchar('\033');
if (esc != '\033')
vidc_rawputchar(esc);
for (i = 0; i <= argc; ++i) {
sprintf(buf, "%d", args[i]);
ch = buf;
while (*ch)
vidc_rawputchar(*ch++);
}
}
vidc_rawputchar(c);
end_term();
}
static void
get_arg(int c)
{
if (argc < 0)
argc = 0;
args[argc] *= 10;
args[argc] += c - '0';
}
/* Emulate basic capabilities of cons25 terminal */
void
vidc_term_emu(int c)
{
static int ansi_col[] = {
0, 4, 2, 6, 1, 5, 3, 7,
};
int t;
int i;
switch (esc) {
case 0:
switch (c) {
case '\033':
esc = c;
break;
default:
vidc_rawputchar(c);
break;
}
break;
case '\033':
switch (c) {
case '[':
esc = c;
args[0] = 0;
argc = -1;
break;
default:
bail_out(c);
break;
}
break;
case '[':
switch (c) {
case ';':
if (argc < 0) /* XXX */
argc = 0;
else if (argc + 1 >= MAXARGS)
bail_out(c);
else
args[++argc] = 0;
break;
case 'H':
if (argc < 0)
HO();
else if (argc == 1)
CM();
else
bail_out(c);
break;
case 'J':
if (argc < 0)
CD();
else
bail_out(c);
break;
case 'm':
if (argc < 0) {
fg_c = DEFAULT_FGCOLOR;
bg_c = DEFAULT_BGCOLOR;
}
for (i = 0; i <= argc; ++i) {
switch (args[i]) {
case 0: /* back to normal */
fg_c = DEFAULT_FGCOLOR;
bg_c = DEFAULT_BGCOLOR;
break;
case 1: /* bold */
fg_c |= 0x8;
break;
case 4: /* underline */
case 5: /* blink */
bg_c |= 0x8;
break;
case 7: /* reverse */
t = fg_c;
fg_c = bg_c;
bg_c = t;
break;
case 22: /* normal intensity */
fg_c &= ~0x8;
break;
case 24: /* not underline */
case 25: /* not blinking */
bg_c &= ~0x8;
break;
case 30: case 31: case 32: case 33:
case 34: case 35: case 36: case 37:
fg_c = ansi_col[args[i] - 30];
break;
case 39: /* normal */
fg_c = DEFAULT_FGCOLOR;
break;
case 40: case 41: case 42: case 43:
case 44: case 45: case 46: case 47:
bg_c = ansi_col[args[i] - 40];
break;
case 49: /* normal */
bg_c = DEFAULT_BGCOLOR;
break;
}
}
end_term();
break;
default:
if (isdigit(c))
get_arg(c);
else
bail_out(c);
break;
}
break;
default:
bail_out(c);
break;
}
}
#endif
static void
vidc_putchar(int c)
{
#ifdef TERM_EMU
vidc_term_emu(c);
#else
vidc_rawputchar(c);
#endif
}
static int
vidc_getchar(void)
{
if (vidc_ischar()) {
v86.ctl = 0;
v86.addr = 0x16;
v86.eax = 0x0;
v86int();
return (v86.eax & 0xff);
} else {
return (-1);
}
}
static int
vidc_ischar(void)
{
v86.ctl = V86_FLAGS;
v86.addr = 0x16;
v86.eax = 0x100;
v86int();
return (!V86_ZR(v86.efl));
}
#if KEYBOARD_PROBE
#define PROBE_MAXRETRY 5
#define PROBE_MAXWAIT 400
#define IO_DUMMY 0x84
#define IO_KBD 0x060 /* 8042 Keyboard */
/* selected defines from kbdio.h */
#define KBD_STATUS_PORT 4 /* status port, read */
#define KBD_DATA_PORT 0 /* data port, read/write
* also used as keyboard command
* and mouse command port
*/
#define KBDC_ECHO 0x00ee
#define KBDS_ANY_BUFFER_FULL 0x0001
#define KBDS_INPUT_BUFFER_FULL 0x0002
#define KBD_ECHO 0x00ee
/* 7 microsec delay necessary for some keyboard controllers */
static void
delay7(void)
{
/*
* I know this is broken, but no timer is available yet at this stage...
* See also comments in `delay1ms()'.
*/
inb(IO_DUMMY); inb(IO_DUMMY);
inb(IO_DUMMY); inb(IO_DUMMY);
inb(IO_DUMMY); inb(IO_DUMMY);
}
/*
* This routine uses an inb to an unused port, the time to execute that
* inb is approximately 1.25uS. This value is pretty constant across
* all CPU's and all buses, with the exception of some PCI implentations
* that do not forward this I/O address to the ISA bus as they know it
* is not a valid ISA bus address, those machines execute this inb in
* 60 nS :-(.
*
*/
static void
delay1ms(void)
{
int i = 800;
while (--i >= 0)
(void)inb(0x84);
}
/*
* We use the presence/absence of a keyboard to determine whether the internal
* console can be used for input.
*
* Perform a simple test on the keyboard; issue the ECHO command and see
* if the right answer is returned. We don't do anything as drastic as
* full keyboard reset; it will be too troublesome and take too much time.
*/
static int
probe_keyboard(void)
{
int retry = PROBE_MAXRETRY;
int wait;
int i;
while (--retry >= 0) {
/* flush any noise */
while (inb(IO_KBD + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL) {
delay7();
inb(IO_KBD + KBD_DATA_PORT);
delay1ms();
}
/* wait until the controller can accept a command */
for (wait = PROBE_MAXWAIT; wait > 0; --wait) {
if (((i = inb(IO_KBD + KBD_STATUS_PORT))
& (KBDS_INPUT_BUFFER_FULL | KBDS_ANY_BUFFER_FULL)) == 0)
break;
if (i & KBDS_ANY_BUFFER_FULL) {
delay7();
inb(IO_KBD + KBD_DATA_PORT);
}
delay1ms();
}
if (wait <= 0)
continue;
/* send the ECHO command */
outb(IO_KBD + KBD_DATA_PORT, KBDC_ECHO);
/* wait for a response */
for (wait = PROBE_MAXWAIT; wait > 0; --wait) {
if (inb(IO_KBD + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL)
break;
delay1ms();
}
if (wait <= 0)
continue;
delay7();
i = inb(IO_KBD + KBD_DATA_PORT);
#ifdef PROBE_KBD_BEBUG
printf("probe_keyboard: got 0x%x.\n", i);
#endif
if (i == KBD_ECHO) {
/* got the right answer */
return (1);
}
}
return (0);
}
#endif /* KEYBOARD_PROBE */