441 lines
9.5 KiB
C
441 lines
9.5 KiB
C
/* $NetBSD: vga.c,v 1.2 2001/07/22 14:57:51 wiz Exp $ */
|
|
|
|
/*-
|
|
* Copyright (C) 1995-1997 Gary Thomas (gdt@linuxppc.org)
|
|
* All rights reserved.
|
|
*
|
|
* VGA 'glass TTY' emulator
|
|
*
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Gary Thomas.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
|
|
*/
|
|
|
|
#ifdef CONS_VGA
|
|
#include <lib/libsa/stand.h>
|
|
#include "boot.h"
|
|
|
|
#define COL 80
|
|
#define ROW 25
|
|
#define CHR 2
|
|
#define MONO_BASE 0x3B4
|
|
#define MONO_BUF 0xB0000
|
|
#define CGA_BASE 0x3D4
|
|
#define CGA_BUF 0xB8000
|
|
|
|
u_char background = 0; /* Black */
|
|
u_char foreground = 7; /* White */
|
|
|
|
u_int addr_6845;
|
|
u_short *Crtat;
|
|
int lastpos;
|
|
int scroll;
|
|
|
|
/*
|
|
* The current state of virtual displays
|
|
*/
|
|
struct screen {
|
|
u_short *cp; /* the current character address */
|
|
enum state {
|
|
NORMAL, /* no pending escape */
|
|
ESC, /* saw ESC */
|
|
EBRAC, /* saw ESC[ */
|
|
EBRACEQ /* saw ESC[= */
|
|
} state; /* command parser state */
|
|
int cx; /* the first escape seq argument */
|
|
int cy; /* the second escap seq argument */
|
|
int *accp; /* pointer to the current processed argument */
|
|
int row; /* current column */
|
|
int so; /* standout mode */
|
|
u_short color; /* normal character color */
|
|
u_short color_so; /* standout color */
|
|
u_short save_color; /* saved normal color */
|
|
u_short save_color_so; /* saved standout color */
|
|
} screen;
|
|
|
|
/*
|
|
* Color and attributes for normal, standout and kernel output
|
|
* are stored in the least-significant byte of a u_short
|
|
* so they don't have to be shifted for use.
|
|
* This is all byte-order dependent.
|
|
*/
|
|
#define CATTR(x) (x) /* store color/attributes un-shifted */
|
|
#define ATTR_ADDR(which) (((u_char *)&(which))+1) /* address of attributes */
|
|
|
|
u_short pccolor; /* color/attributes for tty output */
|
|
u_short pccolor_so; /* color/attributes, standout mode */
|
|
|
|
static void cursor __P((void));
|
|
static void initscreen __P((void));
|
|
void fillw __P((u_short, u_short *, int));
|
|
void video_on __P((void));
|
|
void video_off __P((void));
|
|
|
|
/*
|
|
* cursor() sets an offset (0-1999) into the 80x25 text area
|
|
*/
|
|
static void
|
|
cursor()
|
|
{
|
|
int pos = screen.cp - Crtat;
|
|
|
|
if (lastpos != pos) {
|
|
outb(addr_6845, 14);
|
|
outb(addr_6845+1, pos >> 8);
|
|
outb(addr_6845, 15);
|
|
outb(addr_6845+1, pos);
|
|
lastpos = pos;
|
|
}
|
|
}
|
|
|
|
static void
|
|
initscreen()
|
|
{
|
|
struct screen *d = &screen;
|
|
|
|
pccolor = CATTR((background<<4)|foreground);
|
|
pccolor_so = CATTR((foreground<<4)|background);
|
|
d->color = pccolor;
|
|
d->save_color = pccolor;
|
|
d->color_so = pccolor_so;
|
|
d->save_color_so = pccolor_so;
|
|
}
|
|
|
|
|
|
#define wrtchar(c, d) { \
|
|
*(d->cp) = c; \
|
|
d->cp++; \
|
|
d->row++; \
|
|
}
|
|
|
|
void
|
|
fillw(val, buf, num)
|
|
u_short val;
|
|
u_short *buf;
|
|
int num;
|
|
{
|
|
/* Need to byte swap value */
|
|
u_short tmp;
|
|
|
|
tmp = val;
|
|
while (num-- > 0)
|
|
*buf++ = tmp;
|
|
}
|
|
|
|
/*
|
|
* vga_putc (nee sput) has support for emulation of the 'ibmpc' termcap entry.
|
|
* This is a bare-bones implementation of a bare-bones entry
|
|
* One modification: Change li#24 to li#25 to reflect 25 lines
|
|
* "ca" is the color/attributes value (left-shifted by 8)
|
|
* or 0 if the current regular color for that screen is to be used.
|
|
*/
|
|
void
|
|
vga_putc(int c)
|
|
{
|
|
struct screen *d = &screen;
|
|
u_short *base;
|
|
int i, j;
|
|
u_short *pp;
|
|
|
|
base = Crtat;
|
|
|
|
switch (d->state) {
|
|
case NORMAL:
|
|
switch (c) {
|
|
case 0x0: /* Ignore pad characters */
|
|
return;
|
|
|
|
case 0x1B:
|
|
d->state = ESC;
|
|
break;
|
|
|
|
case '\t':
|
|
do {
|
|
wrtchar(d->color | ' ', d);
|
|
} while (d->row % 8);
|
|
break;
|
|
|
|
case '\b': /* non-destructive backspace */
|
|
if (d->cp > base) {
|
|
d->cp--;
|
|
d->row--;
|
|
if (d->row < 0)
|
|
d->row += COL; /* prev column */
|
|
}
|
|
break;
|
|
|
|
case '\n':
|
|
d->cp += COL;
|
|
case '\r':
|
|
d->cp -= d->row;
|
|
d->row = 0;
|
|
break;
|
|
|
|
case '\007':
|
|
break;
|
|
|
|
default:
|
|
if (d->so) {
|
|
wrtchar(d->color_so|(c<<8), d);
|
|
} else {
|
|
wrtchar(d->color | (c<<8), d);
|
|
}
|
|
if (d->row >= COL)
|
|
d->row = 0;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case EBRAC:
|
|
/*
|
|
* In this state, the action at the end of the switch
|
|
* on the character type is to go to NORMAL state,
|
|
* and intermediate states do a return rather than break.
|
|
*/
|
|
switch (c) {
|
|
case 'm':
|
|
d->so = d->cx;
|
|
break;
|
|
|
|
case 'A': /* back one row */
|
|
if (d->cp >= base + COL)
|
|
d->cp -= COL;
|
|
break;
|
|
|
|
case 'B': /* down one row */
|
|
d->cp += COL;
|
|
break;
|
|
|
|
case 'C': /* right cursor */
|
|
d->cp++;
|
|
d->row++;
|
|
break;
|
|
|
|
case 'D': /* left cursor */
|
|
if (d->cp > base) {
|
|
d->cp--;
|
|
d->row--;
|
|
if (d->row < 0)
|
|
d->row += COL; /* prev column ??? */
|
|
}
|
|
break;
|
|
|
|
case 'J': /* Clear to end of display */
|
|
fillw(d->color|(' '<<8), d->cp, base + COL * ROW - d->cp);
|
|
break;
|
|
|
|
case 'K': /* Clear to EOL */
|
|
fillw(d->color|(' '<<8), d->cp, COL - (d->cp - base) % COL);
|
|
break;
|
|
|
|
case 'H': /* Cursor move */
|
|
if (d->cx > ROW)
|
|
d->cx = ROW;
|
|
if (d->cy > COL)
|
|
d->cy = COL;
|
|
if (d->cx == 0 || d->cy == 0) {
|
|
d->cp = base;
|
|
d->row = 0;
|
|
} else {
|
|
d->cp = base + (d->cx - 1) * COL + d->cy - 1;
|
|
d->row = d->cy - 1;
|
|
}
|
|
break;
|
|
|
|
case '_': /* set cursor */
|
|
if (d->cx)
|
|
d->cx = 1; /* block */
|
|
else
|
|
d->cx = 12; /* underline */
|
|
outb(addr_6845, 10);
|
|
outb(addr_6845+1, d->cx);
|
|
outb(addr_6845, 11);
|
|
outb(addr_6845+1, 13);
|
|
break;
|
|
|
|
case ';': /* Switch params in cursor def */
|
|
d->accp = &d->cy;
|
|
return;
|
|
|
|
case '=': /* ESC[= color change */
|
|
d->state = EBRACEQ;
|
|
return;
|
|
|
|
case 'L': /* Insert line */
|
|
i = (d->cp - base) / COL;
|
|
/* avoid deficiency of bcopy implementation */
|
|
/* XXX: comment and hack relevant? */
|
|
pp = base + COL * (ROW-2);
|
|
for (j = ROW - 1 - i; j--; pp -= COL)
|
|
memmove(pp + COL, pp, COL * CHR);
|
|
fillw(d->color|(' '<<8), base + i * COL, COL);
|
|
break;
|
|
|
|
case 'M': /* Delete line */
|
|
i = (d->cp - base) / COL;
|
|
pp = base + i * COL;
|
|
memmove(pp, pp + COL, (ROW-1 - i)*COL*CHR);
|
|
fillw(d->color|(' '<<8), base + COL * (ROW - 1), COL);
|
|
break;
|
|
|
|
default: /* Only numbers valid here */
|
|
if ((c >= '0') && (c <= '9')) {
|
|
*(d->accp) *= 10;
|
|
*(d->accp) += c - '0';
|
|
return;
|
|
} else
|
|
break;
|
|
}
|
|
d->state = NORMAL;
|
|
break;
|
|
|
|
case EBRACEQ: {
|
|
/*
|
|
* In this state, the action at the end of the switch
|
|
* on the character type is to go to NORMAL state,
|
|
* and intermediate states do a return rather than break.
|
|
*/
|
|
u_char *colp;
|
|
|
|
/*
|
|
* Set foreground/background color
|
|
* for normal mode, standout mode
|
|
* or kernel output.
|
|
* Based on code from kentp@svmp03.
|
|
*/
|
|
switch (c) {
|
|
case 'F':
|
|
colp = ATTR_ADDR(d->color);
|
|
do_fg:
|
|
*colp = (*colp & 0xf0) | (d->cx);
|
|
break;
|
|
|
|
case 'G':
|
|
colp = ATTR_ADDR(d->color);
|
|
do_bg:
|
|
*colp = (*colp & 0xf) | (d->cx << 4);
|
|
break;
|
|
|
|
case 'H':
|
|
colp = ATTR_ADDR(d->color_so);
|
|
goto do_fg;
|
|
|
|
case 'I':
|
|
colp = ATTR_ADDR(d->color_so);
|
|
goto do_bg;
|
|
|
|
case 'S':
|
|
d->save_color = d->color;
|
|
d->save_color_so = d->color_so;
|
|
break;
|
|
|
|
case 'R':
|
|
d->color = d->save_color;
|
|
d->color_so = d->save_color_so;
|
|
break;
|
|
|
|
default: /* Only numbers valid here */
|
|
if ((c >= '0') && (c <= '9')) {
|
|
d->cx *= 10;
|
|
d->cx += c - '0';
|
|
return;
|
|
} else
|
|
break;
|
|
}
|
|
d->state = NORMAL;
|
|
}
|
|
break;
|
|
|
|
case ESC:
|
|
switch (c) {
|
|
case 'c': /* Clear screen & home */
|
|
fillw(d->color|(' '<<8), base, COL * ROW);
|
|
d->cp = base;
|
|
d->row = 0;
|
|
d->state = NORMAL;
|
|
break;
|
|
case '[': /* Start ESC [ sequence */
|
|
d->state = EBRAC;
|
|
d->cx = 0;
|
|
d->cy = 0;
|
|
d->accp = &d->cx;
|
|
break;
|
|
default: /* Invalid, clear state */
|
|
d->state = NORMAL;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
if (d->cp >= base + (COL * ROW)) { /* scroll check */
|
|
memmove(base, base + COL, COL * (ROW - 1) * CHR);
|
|
fillw(d->color|(' '<<8), base + COL * (ROW - 1), COL);
|
|
d->cp -= COL;
|
|
}
|
|
cursor();
|
|
}
|
|
|
|
void
|
|
vga_puts(s)
|
|
char *s;
|
|
{
|
|
char c;
|
|
while ((c = *s++)) {
|
|
vga_putc(c);
|
|
}
|
|
}
|
|
|
|
void
|
|
video_on()
|
|
{
|
|
|
|
/* Enable video */
|
|
outb(0x3C4, 0x01);
|
|
outb(0x3C5, inb(0x3C5) & ~0x20);
|
|
}
|
|
|
|
void
|
|
video_off()
|
|
{
|
|
|
|
/* Disable video */
|
|
outb(0x3C4, 0x01);
|
|
outb(0x3C5, inb(0x3C5) | 0x20);
|
|
}
|
|
|
|
void
|
|
vga_init(ISA_mem)
|
|
u_char *ISA_mem;
|
|
{
|
|
struct screen *d = &screen;
|
|
|
|
memset(d, 0, sizeof (screen));
|
|
video_on();
|
|
|
|
d->cp = Crtat = (u_short *)&ISA_mem[0x0B8000];
|
|
addr_6845 = CGA_BASE;
|
|
initscreen();
|
|
fillw(pccolor|(' '<<8), d->cp, COL * ROW);
|
|
}
|
|
#endif /* CONS_VGA */
|