The second phase of syscons reorganization.

- Split syscons source code into manageable chunks and reorganize
  some of complicated functions.

- Many static variables are moved to the softc structure.

- Added a new key function, PREV.  When this key is pressed, the vty
  immediately before the current vty will become foreground.  Analogue
  to PREV, which is usually assigned to the PrntScrn key.
  PR: kern/10113
  Submitted by: Christian Weisgerber <naddy@mips.rhein-neckar.de>

- Modified the kernel console input function sccngetc() so that it
  handles function keys properly.

- Reorganized the screen update routine.

- VT switching code is reorganized.  It now should be slightly more
  robust than before.

- Added the DEVICE_RESUME function so that syscons no longer hooks the
  APM resume event directly.

- New kernel configuration options: SC_NO_CUTPASTE, SC_NO_FONT_LOADING,
  SC_NO_HISTORY and SC_NO_SYSMOUSE.
  Various parts of syscons can be omitted so that the kernel size is
  reduced.

  SC_PIXEL_MODE
  Made the VESA 800x600 mode an option, rather than a standard part of
  syscons.

  SC_DISABLE_DDBKEY
  Disables the `debug' key combination.

  SC_ALT_MOUSE_IMAGE
  Inverse the character cell at the mouse cursor position in the text
  console, rather than drawing an arrow on the screen.
  Submitted by: Nick Hibma (n_hibma@FreeBSD.ORG)

  SC_DFLT_FONT
  makeoptions "SC_DFLT_FONT=_font_name_"
  Include the named font as the default font of syscons.  16-line,
  14-line and 8-line font data will be compiled in.  This option replaces
  the existing STD8X16FONT option, which loads 16-line font data only.

- The VGA driver is split into /sys/dev/fb/vga.c and /sys/isa/vga_isa.c.

- The video driver provides a set of ioctl commands to manipulate the
  frame buffer.

- New kernel configuration option: VGA_WIDTH90
  Enables 90 column modes: 90x25, 90x30, 90x43, 90x50, 90x60.  These
  modes are mot always supported by the video card.
  PR: i386/7510
  Submitted by: kbyanc@freedomnet.com and alexv@sui.gda.itesm.mx.

- The header file machine/console.h is reorganized; its contents is now
  split into sys/fbio.h, sys/kbio.h (a new file) and sys/consio.h
  (another new file).  machine/console.h is still maintained for
  compatibility reasons.

- Kernel console selection/installation routines are fixed and
  slightly rebumped so that it should now be possible to switch between
  the interanl kernel console (sc or vt) and a remote kernel console
  (sio) again, as it was in 2.x, 3.0 and 3.1.

- Screen savers and splash screen decoders
  Because of the header file reorganization described above, screen
  savers and splash screen decoders are slightly modified.  After this
  update, /sys/modules/syscons/saver.h is no longer necessary and is
  removed.

1 files changed, 829 insertions, 0 deletions

diff --git a/sys/dev/syscons/scgfbrndr.c b/sys/dev/syscons/scgfbrndr.c
new file mode 100644
index 0000000..16c40e2
--- /dev/null
+++ b/sys/dev/syscons/scgfbrndr.c
@@ -0,0 +1,829 @@
+/*-
+ * Copyright (c) 1999 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 as
+ *    the first lines of this file unmodified.
+ * 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 AUTHORS ``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 AUTHORS 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.
+ *
+ * $Id:$
+ */
+
+#include "sc.h"
+#include "vga.h"
+#include "opt_syscons.h"
+#include "opt_vga.h"
+
+#if NSC > 0 && NVGA > 0
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+
+#include <machine/console.h>
+#include <machine/md_var.h>
+
+#include <dev/fb/fbreg.h>
+#include <dev/fb/vgareg.h>
+#include <dev/syscons/syscons.h>
+
+#include <isa/isareg.h>
+
+#ifndef SC_MOUSE_CHAR
+#define SC_MOUSE_CHAR		(0xd0)
+#endif
+
+#ifndef SC_RENDER_DEBUG
+#define SC_RENDER_DEBUG		0
+#endif
+
+static vr_clear_t		vga_txtclear;
+static vr_draw_border_t		vga_txtborder;
+static vr_draw_t		vga_txtdraw;
+static vr_set_cursor_t		vga_txtcursor_shape;
+static vr_draw_cursor_t		vga_txtcursor;
+static vr_blink_cursor_t	vga_txtblink;
+#ifndef SC_NO_CUTPASTE
+static vr_draw_mouse_t		vga_txtmouse;
+#else
+#define vga_txtmouse		(vr_draw_mouse_t *)vga_nop
+#endif
+
+#ifdef SC_PIXEL_MODE
+static vr_clear_t		vga_pxlclear;
+static vr_draw_border_t		vga_pxlborder;
+static vr_draw_t		vga_egadraw;
+static vr_draw_t		vga_vgadraw;
+static vr_set_cursor_t		vga_pxlcursor_shape;
+static vr_draw_cursor_t		vga_pxlcursor;
+static vr_blink_cursor_t	vga_pxlblink;
+#ifndef SC_NO_CUTPASTE
+static vr_draw_mouse_t		vga_pxlmouse;
+#else
+#define vga_pxlmouse		(vr_draw_mouse_t *)vga_nop
+#endif
+#endif /* SC_PIXEL_MODE */
+
+#ifndef SC_NO_MODE_CHANGE
+static vr_draw_border_t		vga_grborder;
+#endif
+
+static void			vga_nop(scr_stat *scp, ...);
+
+static sc_rndr_sw_t txtrndrsw = {
+	vga_txtclear,
+	vga_txtborder,
+	vga_txtdraw,	
+	vga_txtcursor_shape,
+	vga_txtcursor,
+	vga_txtblink,
+	(vr_set_mouse_t *)vga_nop,
+	vga_txtmouse,
+};
+RENDERER(mda, 0, txtrndrsw);
+RENDERER(cga, 0, txtrndrsw);
+RENDERER(ega, 0, txtrndrsw);
+RENDERER(vga, 0, txtrndrsw);
+
+#ifdef SC_PIXEL_MODE
+static sc_rndr_sw_t egarndrsw = {
+	vga_pxlclear,
+	vga_pxlborder,
+	vga_egadraw,
+	vga_pxlcursor_shape,
+	vga_pxlcursor,
+	vga_pxlblink,
+	(vr_set_mouse_t *)vga_nop,
+	vga_pxlmouse,
+};
+RENDERER(ega, PIXEL_MODE, egarndrsw);
+
+static sc_rndr_sw_t vgarndrsw = {
+	vga_pxlclear,
+	vga_pxlborder,
+	vga_vgadraw,
+	vga_pxlcursor_shape,
+	vga_pxlcursor,
+	vga_pxlblink,
+	(vr_set_mouse_t *)vga_nop,
+	vga_pxlmouse,
+};
+RENDERER(vga, PIXEL_MODE, vgarndrsw);
+#endif /* SC_PIXEL_MODE */
+
+#ifndef SC_NO_MODE_CHANGE
+static sc_rndr_sw_t grrndrsw = {
+	(vr_clear_t *)vga_nop,
+	vga_grborder,
+	(vr_draw_t *)vga_nop,
+	(vr_set_cursor_t *)vga_nop,
+	(vr_draw_cursor_t *)vga_nop,
+	(vr_blink_cursor_t *)vga_nop,
+	(vr_set_mouse_t *)vga_nop,
+	(vr_draw_mouse_t *)vga_nop,
+};
+RENDERER(cga, GRAPHICS_MODE, grrndrsw);
+RENDERER(ega, GRAPHICS_MODE, grrndrsw);
+RENDERER(vga, GRAPHICS_MODE, grrndrsw);
+#endif /* SC_NO_MODE_CHANGE */
+
+#ifndef SC_NO_CUTPASTE
+static u_short mouse_and_mask[16] = {
+	0xc000, 0xe000, 0xf000, 0xf800, 0xfc00, 0xfe00, 0xff00, 0xff80,
+	0xfe00, 0x1e00, 0x1f00, 0x0f00, 0x0f00, 0x0000, 0x0000, 0x0000
+};
+static u_short mouse_or_mask[16] = {
+	0x0000, 0x4000, 0x6000, 0x7000, 0x7800, 0x7c00, 0x7e00, 0x6800,
+	0x0c00, 0x0c00, 0x0600, 0x0600, 0x0000, 0x0000, 0x0000, 0x0000
+};
+#endif
+
+static void
+vga_nop(scr_stat *scp, ...)
+{
+}
+
+/* text mode renderer */
+
+static void
+vga_txtclear(scr_stat *scp, int c, int attr)
+{
+	sc_vtb_clear(&scp->scr, c, attr);
+}
+
+static void
+vga_txtborder(scr_stat *scp, int color)
+{
+	(*vidsw[scp->sc->adapter]->set_border)(scp->sc->adp, color);
+}
+
+static void
+vga_txtdraw(scr_stat *scp, int from, int count, int flip)
+{
+	vm_offset_t p;
+	int c;
+	int a;
+
+	if (from + count > scp->xsize*scp->ysize)
+		count = scp->xsize*scp->ysize - from;
+
+	if (flip) {
+		for (p = sc_vtb_pointer(&scp->scr, from); count-- > 0; ++from) {
+			c = sc_vtb_getc(&scp->vtb, from);
+			a = sc_vtb_geta(&scp->vtb, from);
+			a = (a & 0x8800) | ((a & 0x7000) >> 4) 
+				| ((a & 0x0700) << 4);
+			p = sc_vtb_putchar(&scp->scr, p, c, a);
+		}
+	} else {
+		sc_vtb_copy(&scp->vtb, from, &scp->scr, from, count);
+	}
+}
+
+static void 
+vga_txtcursor_shape(scr_stat *scp, int base, int height, int blink)
+{
+	if (base < 0 || base >= scp->font_size)
+		return;
+	/* the caller may set height <= 0 in order to disable the cursor */
+#if 0
+	scp->cursor_base = base;
+	scp->cursor_height = height;
+#endif
+	(*vidsw[scp->sc->adapter]->set_hw_cursor_shape)(scp->sc->adp,
+							base, height,
+							scp->font_size, blink);
+}
+
+static void
+vga_txtcursor(scr_stat *scp, int at, int blink, int on, int flip)
+{
+	video_adapter_t *adp;
+	int cursor_attr;
+
+	if (scp->cursor_height <= 0)	/* the text cursor is disabled */
+		return;
+
+	adp = scp->sc->adp;
+	if (blink) {
+		scp->status |= VR_CURSOR_BLINK;
+		if (on) {
+			scp->status |= VR_CURSOR_ON;
+			(*vidsw[adp->va_index]->set_hw_cursor)(adp,
+							       at%scp->xsize,
+							       at/scp->xsize); 
+		} else {
+			if (scp->status & VR_CURSOR_ON)
+				(*vidsw[adp->va_index]->set_hw_cursor)(adp,
+								       -1, -1);
+			scp->status &= ~VR_CURSOR_ON;
+		}
+	} else {
+		scp->status &= ~VR_CURSOR_BLINK;
+		if (on) {
+			scp->status |= VR_CURSOR_ON;
+			cursor_attr = sc_vtb_geta(&scp->vtb, at);
+			scp->cursor_saveunder_char = sc_vtb_getc(&scp->scr, at);
+			scp->cursor_saveunder_attr = cursor_attr;
+			if ((cursor_attr & 0x7000) == 0x7000) {
+				cursor_attr &= 0x8f00;
+				if ((cursor_attr & 0x0700) == 0)
+					cursor_attr |= 0x0700;
+			} else {
+				cursor_attr |= 0x7000;
+				if ((cursor_attr & 0x0700) == 0x0700)
+					cursor_attr &= 0xf000;
+			}
+			if (flip)
+				cursor_attr = (cursor_attr & 0x8800)
+					| ((cursor_attr & 0x7000) >> 4)
+					| ((cursor_attr & 0x0700) << 4);
+			sc_vtb_putc(&scp->scr, at,
+				    sc_vtb_getc(&scp->scr, at),
+				    cursor_attr);
+		} else {
+			cursor_attr = scp->cursor_saveunder_attr;
+			if (flip)
+				cursor_attr = (cursor_attr & 0x8800)
+					| ((cursor_attr & 0x7000) >> 4)
+					| ((cursor_attr & 0x0700) << 4);
+			if (scp->status & VR_CURSOR_ON)
+				sc_vtb_putc(&scp->scr, at,
+					    scp->cursor_saveunder_char,
+					    cursor_attr);
+			scp->status &= ~VR_CURSOR_ON;
+		}
+	}
+}
+
+static void
+vga_txtblink(scr_stat *scp, int at, int flip)
+{
+}
+
+#ifndef SC_NO_CUTPASTE
+
+static void
+draw_txtmouse(scr_stat *scp, int x, int y)
+{
+#ifndef SC_ALT_MOUSE_IMAGE
+	u_char font_buf[128];
+	u_short cursor[32];
+	int pos;
+	int xoffset, yoffset;
+	int crtc_addr;
+	int i;
+
+	/* prepare mousepointer char's bitmaps */
+	pos = (y/scp->font_size - scp->yoff)*scp->xsize + x/8 - scp->xoff;
+	bcopy(scp->font + sc_vtb_getc(&scp->vtb, pos)*scp->font_size,
+	      &font_buf[0], scp->font_size);
+	bcopy(scp->font + sc_vtb_getc(&scp->vtb, pos + 1)*scp->font_size,
+	      &font_buf[32], scp->font_size);
+	bcopy(scp->font 
+		 + sc_vtb_getc(&scp->vtb, pos + scp->xsize)*scp->font_size,
+	      &font_buf[64], scp->font_size);
+	bcopy(scp->font
+		 + sc_vtb_getc(&scp->vtb, pos + scp->xsize + 1)*scp->font_size,
+	      &font_buf[96], scp->font_size);
+	for (i = 0; i < scp->font_size; ++i) {
+		cursor[i] = font_buf[i]<<8 | font_buf[i+32];
+		cursor[i + scp->font_size] = font_buf[i+64]<<8 | font_buf[i+96];
+	}
+
+	/* now and-or in the mousepointer image */
+	xoffset = x%8;
+	yoffset = y%scp->font_size;
+	for (i = 0; i < 16; ++i) {
+		cursor[i + yoffset] =
+	    		(cursor[i + yoffset] & ~(mouse_and_mask[i] >> xoffset))
+	    		| (mouse_or_mask[i] >> xoffset);
+	}
+	for (i = 0; i < scp->font_size; ++i) {
+		font_buf[i] = (cursor[i] & 0xff00) >> 8;
+		font_buf[i + 32] = cursor[i] & 0xff;
+		font_buf[i + 64] = (cursor[i + scp->font_size] & 0xff00) >> 8;
+		font_buf[i + 96] = cursor[i + scp->font_size] & 0xff;
+	}
+
+#if 1
+	/* wait for vertical retrace to avoid jitter on some videocards */
+	crtc_addr = scp->sc->adp->va_crtc_addr;
+	while (!(inb(crtc_addr + 6) & 0x08)) /* idle */ ;
+#endif
+	(*vidsw[scp->sc->adapter]->load_font)(scp->sc->adp, 0, 32, font_buf,
+					      SC_MOUSE_CHAR, 4); 
+
+	sc_vtb_putc(&scp->scr, pos, SC_MOUSE_CHAR, sc_vtb_geta(&scp->scr, pos));
+	/* FIXME: may be out of range! */
+	sc_vtb_putc(&scp->scr, pos + scp->xsize, SC_MOUSE_CHAR + 2,
+		    sc_vtb_geta(&scp->scr, pos + scp->xsize));
+	if (x < (scp->xsize - 1)*8) {
+		sc_vtb_putc(&scp->scr, pos + 1, SC_MOUSE_CHAR + 1,
+			    sc_vtb_geta(&scp->scr, pos + 1));
+		sc_vtb_putc(&scp->scr, pos + scp->xsize + 1, SC_MOUSE_CHAR + 3,
+			    sc_vtb_geta(&scp->scr, pos + scp->xsize + 1));
+	}
+#else /* SC_ALT_MOUSE_IMAGE */
+	/* Red, magenta and brown are mapped to green to to keep it readable */
+	static const int col_conv[16] = {
+		6, 6, 6, 6, 2, 2, 2, 6, 14, 14, 14, 14, 10, 10, 10, 14
+	};
+	int pos;
+	int color;
+	int a;
+
+	pos = (y/scp->font_size - scp->yoff)*scp->xsize + x/8 - scp->xoff;
+	a = sc_vtb_geta(&scp->scr, pos);
+	if (scp->sc->adp->va_flags & V_ADP_COLOR)
+		color = (col_conv[(a & 0xf000) >> 12] << 12)
+			| ((a & 0x0f00) | 0x0800);
+	else
+		color = ((a & 0xf000) >> 4) | ((a & 0x0f00) << 4);
+	sc_vtb_putc(&scp->scr, pos, sc_vtb_getc(&scp->scr, pos), color);
+#endif /* SC_ALT_MOUSE_IMAGE */
+}
+
+static void
+remove_txtmouse(scr_stat *scp, int x, int y)
+{
+}
+
+static void 
+vga_txtmouse(scr_stat *scp, int x, int y, int on)
+{
+	if (on)
+		draw_txtmouse(scp, x, y);
+	else
+		remove_txtmouse(scp, x, y);
+}
+
+#endif /* SC_NO_CUTPASTE */
+
+#ifdef SC_PIXEL_MODE
+
+/* pixel (raster text) mode renderer */
+
+static void
+vga_pxlclear(scr_stat *scp, int c, int attr)
+{
+	vm_offset_t p;
+	int line_width;
+	int lines;
+	int i;
+
+	/* XXX: we are just filling the screen with the background color... */
+	outw(GDCIDX, 0x0005);		/* read mode 0, write mode 0 */
+	outw(GDCIDX, 0x0003);		/* data rotate/function select */
+	outw(GDCIDX, 0x0f01);		/* set/reset enable */
+	outw(GDCIDX, 0xff08);		/* bit mask */
+	outw(GDCIDX, ((attr & 0xf000) >> 4) | 0x00); /* set/reset */
+	line_width = scp->sc->adp->va_line_width;
+	lines = scp->ysize*scp->font_size; 
+	p = scp->sc->adp->va_window + line_width*scp->yoff*scp->font_size
+		+ scp->xoff;
+	for (i = 0; i < lines; ++i) {
+		bzero_io((void *)p, scp->xsize);
+		p += line_width;
+	}
+	outw(GDCIDX, 0x0000);		/* set/reset */
+	outw(GDCIDX, 0x0001);		/* set/reset enable */
+}
+
+static void
+vga_pxlborder(scr_stat *scp, int color)
+{
+	vm_offset_t p;
+	int line_width;
+	int i;
+
+	(*vidsw[scp->sc->adapter]->set_border)(scp->sc->adp, color);
+
+	outw(GDCIDX, 0x0005);		/* read mode 0, write mode 0 */
+	outw(GDCIDX, 0x0003);		/* data rotate/function select */
+	outw(GDCIDX, 0x0f01);		/* set/reset enable */
+	outw(GDCIDX, 0xff08);		/* bit mask */
+	outw(GDCIDX, (color << 8) | 0x00);	/* set/reset */
+	line_width = scp->sc->adp->va_line_width;
+	p = scp->sc->adp->va_window;
+	if (scp->yoff > 0) {
+		bzero_io((void *)p, line_width*scp->yoff*scp->font_size);
+		bzero_io((void *)(p + line_width*(scp->yoff + scp->ysize)
+					  *scp->font_size),
+			 line_width*(scp->ypixel
+				     - (scp->yoff + scp->ysize)*scp->font_size));
+	}
+	if (scp->xoff > 0) {
+		for (i = 0; i < scp->ysize*scp->font_size; ++i) {
+			bzero_io((void *)(p + line_width
+					          *(scp->yoff*scp->font_size + i)),
+				 scp->xoff);
+			bzero_io((void *)(p + line_width
+						  *(scp->yoff*scp->font_size + i)
+				     + scp->xoff + scp->xsize), 
+				 scp->xpixel/8 - scp->xoff - scp->xsize);
+		}
+	}
+	outw(GDCIDX, 0x0000);		/* set/reset */
+	outw(GDCIDX, 0x0001);		/* set/reset enable */
+}
+
+static void 
+vga_egadraw(scr_stat *scp, int from, int count, int flip)
+{
+	vm_offset_t d;
+	vm_offset_t e;
+	u_char *f;
+	u_short bg;
+	u_short col1, col2;
+	int line_width;
+	int i, j;
+	int a;
+	u_char c;
+
+	line_width = scp->sc->adp->va_line_width;
+	d = scp->sc->adp->va_window
+		+ scp->xoff 
+		+ scp->yoff*scp->font_size*line_width 
+		+ (from%scp->xsize) 
+		+ scp->font_size*line_width*(from/scp->xsize);
+
+	outw(GDCIDX, 0x0005);		/* read mode 0, write mode 0 */
+	outw(GDCIDX, 0x0003);		/* data rotate/function select */
+	outw(GDCIDX, 0x0f01);		/* set/reset enable */
+	bg = -1;
+	if (from + count > scp->xsize*scp->ysize)
+		count = scp->xsize*scp->ysize - from;
+	for (i = from; count-- > 0; ++i) {
+		a = sc_vtb_geta(&scp->vtb, i);
+		if (flip) {
+			col1 = ((a & 0x7000) >> 4) | (a & 0x0800);
+			col2 = ((a & 0x8000) >> 4) | (a & 0x0700);
+		} else {
+			col1 = (a & 0x0f00);
+			col2 = (a & 0xf000) >> 4;
+		}
+		/* set background color in EGA/VGA latch */
+		if (bg != col2) {
+			bg = col2;
+			outw(GDCIDX, bg | 0x00);	/* set/reset */
+			outw(GDCIDX, 0xff08);		/* bit mask */
+			writeb(d, 0);
+			c = readb(d);	/* set bg color in the latch */
+		}
+		/* foreground color */
+		outw(GDCIDX, col1 | 0x00);		/* set/reset */
+		e = d;
+		f = &(scp->font[sc_vtb_getc(&scp->vtb, i)*scp->font_size]);
+		for (j = 0; j < scp->font_size; ++j, ++f) {
+			outw(GDCIDX, (*f << 8) | 0x08);	/* bit mask */
+	        	writeb(e, 0);
+			e += line_width;
+		}
+		++d;
+		if ((i % scp->xsize) == scp->xsize - 1)
+			d += scp->xoff*2 
+				 + (scp->font_size - 1)*line_width;
+	}
+	outw(GDCIDX, 0x0000);		/* set/reset */
+	outw(GDCIDX, 0x0001);		/* set/reset enable */
+	outw(GDCIDX, 0xff08);		/* bit mask */
+}
+
+static void 
+vga_vgadraw(scr_stat *scp, int from, int count, int flip)
+{
+	vm_offset_t d;
+	vm_offset_t e;
+	u_char *f;
+	u_short bg;
+	u_short col1, col2;
+	int line_width;
+	int i, j;
+	int a;
+	u_char c;
+
+	line_width = scp->sc->adp->va_line_width;
+	d = scp->sc->adp->va_window
+		+ scp->xoff 
+		+ scp->yoff*scp->font_size*line_width 
+		+ (from%scp->xsize) 
+		+ scp->font_size*line_width*(from/scp->xsize);
+
+	outw(GDCIDX, 0x0305);		/* read mode 0, write mode 3 */
+	outw(GDCIDX, 0x0003);		/* data rotate/function select */
+	outw(GDCIDX, 0x0f01);		/* set/reset enable */
+	outw(GDCIDX, 0xff08);		/* bit mask */
+	bg = -1;
+	if (from + count > scp->xsize*scp->ysize)
+		count = scp->xsize*scp->ysize - from;
+	for (i = from; count-- > 0; ++i) {
+		a = sc_vtb_geta(&scp->vtb, i);
+		if (flip) {
+			col1 = ((a & 0x7000) >> 4) | (a & 0x0800);
+			col2 = ((a & 0x8000) >> 4) | (a & 0x0700);
+		} else {
+			col1 = (a & 0x0f00);
+			col2 = (a & 0xf000) >> 4;
+		}
+		/* set background color in EGA/VGA latch */
+		if (bg != col2) {
+			bg = col2;
+			outw(GDCIDX, 0x0005);	/* read mode 0, write mode 0 */
+			outw(GDCIDX, bg | 0x00); /* set/reset */
+			writeb(d, 0);
+			c = readb(d);		/* set bg color in the latch */
+			outw(GDCIDX, 0x0305);	/* read mode 0, write mode 3 */
+		}
+		/* foreground color */
+		outw(GDCIDX, col1 | 0x00);	/* set/reset */
+		e = d;
+		f = &(scp->font[sc_vtb_getc(&scp->vtb, i)*scp->font_size]);
+		for (j = 0; j < scp->font_size; ++j, ++f) {
+	        	writeb(e, *f);
+			e += line_width;
+		}
+		++d;
+		if ((i % scp->xsize) == scp->xsize - 1)
+			d += scp->xoff*2 
+				 + (scp->font_size - 1)*line_width;
+	}
+	outw(GDCIDX, 0x0005);		/* read mode 0, write mode 0 */
+	outw(GDCIDX, 0x0000);		/* set/reset */
+	outw(GDCIDX, 0x0001);		/* set/reset enable */
+}
+
+static void 
+vga_pxlcursor_shape(scr_stat *scp, int base, int height, int blink)
+{
+	if (base < 0 || base >= scp->font_size)
+		return;
+	/* the caller may set height <= 0 in order to disable the cursor */
+#if 0
+	scp->cursor_base = base;
+	scp->cursor_height = height;
+#endif
+}
+
+static void 
+draw_pxlcursor(scr_stat *scp, int at, int on, int flip)
+{
+	vm_offset_t d;
+	u_char *f;
+	int line_width;
+	int height;
+	int col;
+	int a;
+	int i;
+	u_char c;
+
+	line_width = scp->sc->adp->va_line_width;
+	d = scp->sc->adp->va_window
+		+ scp->xoff 
+		+ scp->yoff*scp->font_size*line_width 
+		+ (at%scp->xsize) 
+		+ scp->font_size*line_width*(at/scp->xsize)
+		+ (scp->font_size - scp->cursor_base - 1)*line_width;
+
+	outw(GDCIDX, 0x0005);		/* read mode 0, write mode 0 */
+	outw(GDCIDX, 0x0003);		/* data rotate/function select */
+	outw(GDCIDX, 0x0f01);		/* set/reset enable */
+	/* set background color in EGA/VGA latch */
+	a = sc_vtb_geta(&scp->vtb, at);
+	if (flip)
+		col = (on) ? ((a & 0xf000) >> 4) : (a & 0x0f00);
+	else
+		col = (on) ? (a & 0x0f00) : ((a & 0xf000) >> 4);
+	outw(GDCIDX, col | 0x00);	/* set/reset */
+	outw(GDCIDX, 0xff08);		/* bit mask */
+	writeb(d, 0);
+	c = readb(d);			/* set bg color in the latch */
+	/* foreground color */
+	if (flip)
+		col = (on) ? (a & 0x0f00) : ((a & 0xf000) >> 4);
+	else
+		col = (on) ? ((a & 0xf000) >> 4) : (a & 0x0f00);
+	outw(GDCIDX, col | 0x00);	/* set/reset */
+	f = &(scp->font[sc_vtb_getc(&scp->vtb, at)*scp->font_size
+		+ scp->font_size - scp->cursor_base - 1]);
+	height = imin(scp->cursor_height, scp->font_size);
+	for (i = 0; i < height; ++i, --f) {
+		outw(GDCIDX, (*f << 8) | 0x08);	/* bit mask */
+	       	writeb(d, 0);
+		d -= line_width;
+	}
+	outw(GDCIDX, 0x0000);		/* set/reset */
+	outw(GDCIDX, 0x0001);		/* set/reset enable */
+	outw(GDCIDX, 0xff08);		/* bit mask */
+}
+
+static void 
+vga_pxlcursor(scr_stat *scp, int at, int blink, int on, int flip)
+{
+	if (scp->cursor_height <= 0)	/* the text cursor is disabled */
+		return;
+
+	if (on) {
+		scp->status |= VR_CURSOR_ON;
+		draw_pxlcursor(scp, at, on, flip);
+	} else {
+		if (scp->status & VR_CURSOR_ON)
+			draw_pxlcursor(scp, at, on, flip);
+		scp->status &= ~VR_CURSOR_ON;
+	}
+	if (blink)
+		scp->status |= VR_CURSOR_BLINK;
+	else
+		scp->status &= ~VR_CURSOR_BLINK;
+}
+
+static void
+vga_pxlblink(scr_stat *scp, int at, int flip)
+{
+	static int blinkrate = 0;
+
+	if (!(scp->status & VR_CURSOR_BLINK))
+		return;
+	if (!(++blinkrate & 4))
+		return;
+	blinkrate = 0;
+	scp->status ^= VR_CURSOR_ON;
+	draw_pxlcursor(scp, at, scp->status & VR_CURSOR_ON, flip);
+}
+
+#ifndef SC_NO_CUTPASTE
+
+static void
+draw_pxlmouse(scr_stat *scp, int x, int y)
+{
+	vm_offset_t p;
+	int line_width;
+	int xoff, yoff;
+	int ymax;
+	u_short m;
+	int i, j;
+
+	line_width = scp->sc->adp->va_line_width;
+	xoff = (x - scp->xoff*8)%8;
+	yoff = y - (y/line_width)*line_width;
+	ymax = imin(y + 16, scp->ypixel);
+
+	outw(GDCIDX, 0x0805);		/* read mode 1, write mode 0 */
+	outw(GDCIDX, 0x0001);		/* set/reset enable */
+	outw(GDCIDX, 0x0002);		/* color compare */
+	outw(GDCIDX, 0x0007);		/* color don't care */
+	outw(GDCIDX, 0xff08);		/* bit mask */
+	outw(GDCIDX, 0x0803);		/* data rotate/function select (and) */
+	p = scp->sc->adp->va_window + line_width*y + x/8;
+	if (x < scp->xpixel - 16) {
+		for (i = y, j = 0; i < ymax; ++i, ++j) {
+			m = ~(mouse_and_mask[j] >> xoff);
+#ifdef __i386__
+			*(u_char *)p &= m >> 8;
+			*(u_char *)(p + 1) &= m;
+#elif defined(__alpha__)
+			writeb(p, readb(p) & (m >> 8));
+			writeb(p + 1, readb(p + 1) & (m >> 8));
+#endif
+			p += line_width;
+		}
+	} else {
+		xoff += 8;
+		for (i = y, j = 0; i < ymax; ++i, ++j) {
+			m = ~(mouse_and_mask[j] >> xoff);
+#ifdef __i386__
+			*(u_char *)p &= m;
+#elif defined(__alpha__)
+			writeb(p, readb(p) & (m >> 8));
+#endif
+			p += line_width;
+		}
+	}
+	outw(GDCIDX, 0x1003);		/* data rotate/function select (or) */
+	p = scp->sc->adp->va_window + line_width*y + x/8;
+	if (x < scp->xpixel - 16) {
+		for (i = y, j = 0; i < ymax; ++i, ++j) {
+			m = mouse_or_mask[j] >> xoff;
+#ifdef __i386__
+			*(u_char *)p &= m >> 8;
+			*(u_char *)(p + 1) &= m;
+#elif defined(__alpha__)
+			writeb(p, readb(p) & (m >> 8));
+			writeb(p + 1, readb(p + 1) & (m >> 8));
+#endif
+			p += line_width;
+		}
+	} else {
+		for (i = y, j = 0; i < ymax; ++i, ++j) {
+			m = mouse_or_mask[j] >> xoff;
+#ifdef __i386__
+			*(u_char *)p &= m;
+#elif defined(__alpha__)
+			writeb(p, readb(p) & (m >> 8));
+#endif
+			p += line_width;
+		}
+	}
+	outw(GDCIDX, 0x0005);		/* read mode 0, write mode 0 */
+	outw(GDCIDX, 0x0003);		/* data rotate/function select */
+}
+
+static void
+remove_pxlmouse(scr_stat *scp, int x, int y)
+{
+	vm_offset_t p;
+	int col, row;
+	int pos;
+	int line_width;
+	int ymax;
+	int i;
+
+	/* erase the mouse cursor image */
+	col = x/8 - scp->xoff;
+	row = y/scp->font_size - scp->yoff;
+	pos = row*scp->xsize + col;
+	i = (col < scp->xsize - 1) ? 2 : 1;
+	(*scp->rndr->draw)(scp, pos, i, FALSE);
+	if (row < scp->ysize - 1)
+		(*scp->rndr->draw)(scp, pos + scp->xsize, i, FALSE);
+
+	/* paint border if necessary */
+	line_width = scp->sc->adp->va_line_width;
+	outw(GDCIDX, 0x0005);		/* read mode 0, write mode 0 */
+	outw(GDCIDX, 0x0003);		/* data rotate/function select */
+	outw(GDCIDX, 0x0f01);		/* set/reset enable */
+	outw(GDCIDX, 0xff08);		/* bit mask */
+	outw(GDCIDX, (scp->border << 8) | 0x00);	/* set/reset */
+	if (row == scp->ysize - 1) {
+		i = (scp->ysize + scp->yoff)*scp->font_size;
+		ymax = imin(i + scp->font_size, scp->ypixel);
+		p = scp->sc->adp->va_window + i*line_width + scp->xoff + col;
+		if (col < scp->xsize - 1) {
+			for (; i < ymax; ++i) {
+				writeb(p, 0);
+				writeb(p + 1, 0);
+				p += line_width;
+			}
+		} else {
+			for (; i < ymax; ++i) {
+				writeb(p, 0);
+				p += line_width;
+			}
+		}
+	}
+	if ((col == scp->xsize - 1) && (scp->xoff > 0)) {
+		i = (row + scp->yoff)*scp->font_size;
+		ymax = imin(i + scp->font_size*2, scp->ypixel);
+		p = scp->sc->adp->va_window + i*line_width
+			+ scp->xoff + scp->xsize;
+		for (; i < ymax; ++i) {
+			writeb(p, 0);
+			p += line_width;
+		}
+	}
+	outw(GDCIDX, 0x0000);		/* set/reset */
+	outw(GDCIDX, 0x0001);		/* set/reset enable */
+}
+
+static void 
+vga_pxlmouse(scr_stat *scp, int x, int y, int on)
+{
+	if (on)
+		draw_pxlmouse(scp, x, y);
+	else
+		remove_pxlmouse(scp, x, y);
+}
+
+#endif /* SC_NO_CUTPASTE */
+#endif /* SC_PIXEL_MODE */
+
+#ifndef SC_NO_MODE_CHANGE
+
+/* graphics mode renderer */
+
+static void
+vga_grborder(scr_stat *scp, int color)
+{
+	(*vidsw[scp->sc->adapter]->set_border)(scp->sc->adp, color);
+}
+
+#endif
+
+#endif /* NSC > 0 && NVGA > 0 */