Switched to new syscons driver.

Submitted by:	NOKUBI Hirotaka <hnokubi@yyy.or.jp> and
             	Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>

1 files changed, 859 insertions, 0 deletions

diff --git a/sys/pc98/cbus/gdc.c b/sys/pc98/cbus/gdc.c
new file mode 100644
index 0000000..006072b
--- /dev/null
+++ b/sys/pc98/cbus/gdc.c
@@ -0,0 +1,859 @@
+#define TEXT_GDC	IO_GDC1	/* 0x60 */
+#define	ROW		25
+#define	COL		80
+/*-
+ * $Id$
+ */
+
+#include "gdc.h"
+#include "opt_gdc.h"
+#include "opt_fb.h"
+#include "opt_syscons.h"
+
+#if NGDC > 0
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/malloc.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <machine/console.h>
+#include <machine/md_var.h>
+#include <machine/pc/bios.h>
+
+#include <dev/fb/fbreg.h>
+
+#include <pc98/pc98/pc98.h>
+#include <pc98/pc98/pc98_machdep.h>
+
+#include <i386/isa/isa_device.h>
+
+#define DRIVER_NAME	"gdc"
+
+/* cdev driver declaration */
+
+#define GDC_UNIT(dev)	minor(dev)
+#define GDC_MKMINOR(unit) (unit)
+
+static int		gdcprobe(struct isa_device *dev);
+static int		gdc_attach(struct isa_device *dev);
+static void		gdc_drvinit(void *unused);
+
+struct isa_driver gdcdriver = {
+	gdcprobe,
+	gdc_attach,
+	DRIVER_NAME,
+	0,
+};
+
+typedef struct gdc_softc {
+	video_adapter_t	*adp;
+} gdc_softc_t;
+
+static int		gdc_probe_unit(int unit, gdc_softc_t *sc, int flags);
+static int		gdc_attach_unit(int unit, gdc_softc_t *sc, int flags);
+
+#define GDC_SOFTC(unit)	(gdc_softc[unit])
+
+static gdc_softc_t	*gdc_softc[NGDC];
+
+#if FB_INSTALL_CDEV
+
+static d_open_t		gdcopen;
+static d_close_t	gdcclose;
+static d_read_t		gdcread;
+static d_ioctl_t	gdcioctl;
+
+static struct  cdevsw vga_cdevsw = {
+	gdcopen,	gdcclose,	noread,		nowrite,	/* ?? */
+	gdcioctl,	nostop,		nullreset,	nodevtotty,
+	seltrue,	nommap,		NULL,		DRIVER_NAME,
+	NULL,		-1,		nodump,		nopsize,
+};
+
+#endif /* FB_INSTALL_CDEV */
+
+static int
+gdcprobe(struct isa_device *dev)
+{
+	gdc_softc_t *sc;
+	int error;
+
+	if (dev->id_unit >= sizeof(gdc_softc)/sizeof(gdc_softc[0]))
+		return 0;
+	sc = gdc_softc[dev->id_unit]
+	   = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT);
+	if (sc == NULL)
+		return 0;
+
+	error = gdc_probe_unit(dev->id_unit, sc, dev->id_flags);
+	if (error) {
+		gdc_softc[dev->id_unit] = NULL;
+		free(sc, M_DEVBUF);
+		return 0;
+	}
+
+	dev->id_iobase = sc->adp->va_io_base;
+	dev->id_maddr = (caddr_t)BIOS_PADDRTOVADDR(sc->adp->va_mem_base);
+	dev->id_msize = sc->adp->va_mem_size;
+
+	return sc->adp->va_io_size;
+}
+
+static int
+gdc_attach(struct isa_device *dev)
+{
+	gdc_softc_t *sc;
+
+	if (dev->id_unit >= sizeof(gdc_softc)/sizeof(gdc_softc[0]))
+		return 0;
+	sc = gdc_softc[dev->id_unit];
+	if (sc == NULL)
+		return 0;
+
+	return ((gdc_attach_unit(dev->id_unit, sc, dev->id_flags)) ? 0 : 1);
+}
+
+static int
+gdc_probe_unit(int unit, gdc_softc_t *sc, int flags)
+{
+	video_switch_t *sw;
+
+	bzero(sc, sizeof(*sc));
+	sw = vid_get_switch(DRIVER_NAME);
+	if (sw == NULL)
+		return 0;
+	return (*sw->probe)(unit, &sc->adp, NULL, flags);
+}
+
+static int
+gdc_attach_unit(int unit, gdc_softc_t *sc, int flags)
+{
+	video_switch_t *sw;
+	int error;
+
+	sw = vid_get_switch(DRIVER_NAME);
+	if (sw == NULL)
+		return ENXIO;
+
+	error = (*sw->init)(unit, sc->adp, flags);
+	if (error)
+		return ENXIO;
+
+#ifdef FB_INSTALL_CDEV
+	/* attach a virtual frame buffer device */
+	error = fb_attach(makedev(0, GDC_MKMINOR(unit)), scp->adp,
+			  &vga_cdevsw);
+	if (error)
+		return error;
+#endif /* FB_INSTALL_CDEV */
+
+	if (bootverbose)
+		(*sw->diag)(sc->adp, bootverbose);
+
+	return 0;
+}
+
+/* LOW-LEVEL */
+
+#include <machine/clock.h>
+
+#include <pc98/pc98/30line.h>
+
+#define TEXT_BUF_BASE		0x000a0000
+#define TEXT_BUF_SIZE		0x00008000
+#define GRAPHICS_BUF_BASE	0x000a8000
+#define GRAPHICS_BUF_SIZE	0x00040000
+#define VIDEO_BUF_BASE		0x000a0000
+#define VIDEO_BUF_SIZE		0x00048000
+
+#define probe_done(adp)		((adp)->va_flags & V_ADP_PROBED)
+#define init_done(adp)		((adp)->va_flags & V_ADP_INITIALIZED)
+#define config_done(adp)	((adp)->va_flags & V_ADP_REGISTERED)
+
+/* 
+ * NOTE: `va_window' should have a virtual address, but is initialized
+ * with a physical address in the following table, they will be
+ * converted at run-time.
+ */
+static video_adapter_t adapter_init_value[] = {
+    { 0,
+      KD_PC98, "gdc",			/* va_type, va_name */
+      0, 0, 				/* va_unit, va_minor */
+      V_ADP_COLOR | V_ADP_MODECHANGE | V_ADP_BORDER, 
+      IO_GDC1, 16, TEXT_GDC,		/* va_io*, XXX */
+      VIDEO_BUF_BASE, VIDEO_BUF_SIZE,	/* va_mem* */
+      TEXT_BUF_BASE, TEXT_BUF_SIZE, TEXT_BUF_SIZE, /* va_window* */
+      0, 0, 				/* va_buffer, va_buffer_size */
+      0, M_PC98_80x25, 0, 0,		/* va_*mode* */
+      NULL },
+};
+
+static video_adapter_t	biosadapter[1];
+
+/* video driver declarations */
+static int			gdc_configure(int flags);
+static int			gdc_nop(void);
+static vi_probe_t		gdc_probe;
+static vi_init_t		gdc_init;
+static vi_get_info_t		gdc_get_info;
+static vi_query_mode_t		gdc_query_mode;
+static vi_set_mode_t		gdc_set_mode;
+static vi_set_border_t		gdc_set_border;
+static vi_save_state_t		gdc_save_state;
+static vi_load_state_t		gdc_load_state;
+static vi_read_hw_cursor_t	gdc_read_hw_cursor;
+static vi_set_hw_cursor_t	gdc_set_hw_cursor;
+static vi_set_hw_cursor_shape_t	gdc_set_hw_cursor_shape;
+static vi_mmap_t		gdc_mmap;
+static vi_diag_t		gdc_diag;
+
+static int			gdc_err(video_adapter_t *adp, ...);
+
+static video_switch_t gdcvidsw = {
+	gdc_probe,
+	gdc_init,
+	gdc_get_info,
+	gdc_query_mode,	
+	gdc_set_mode,
+	(vi_save_font_t *)gdc_err,
+	(vi_load_font_t *)gdc_err,
+	(vi_show_font_t *)gdc_err,
+	(vi_save_palette_t *)gdc_err,
+	(vi_load_palette_t *)gdc_err,
+	gdc_set_border,
+	gdc_save_state,
+	gdc_load_state,
+	(vi_set_win_org_t *)gdc_err,
+	gdc_read_hw_cursor,
+	gdc_set_hw_cursor,
+	gdc_set_hw_cursor_shape,
+	(vi_blank_display_t *)gdc_nop,
+	gdc_mmap,
+	gdc_diag,
+};
+
+VIDEO_DRIVER(gdc, gdcvidsw, gdc_configure);
+
+/* GDC BIOS standard video modes */
+#define EOT		(-1)
+#define NA		(-2)
+
+static video_info_t bios_vmode[] = {
+    { M_PC98_80x25, V_INFO_COLOR, 80, 25, 8, 16, 4, 1,
+      TEXT_BUF_BASE, TEXT_BUF_SIZE, TEXT_BUF_SIZE, 0, 0 },
+#ifdef LINE30
+    { M_PC98_80x30, V_INFO_COLOR, 80, 30, 8, 16, 4, 1,
+      TEXT_BUF_BASE, TEXT_BUF_SIZE, TEXT_BUF_SIZE, 0, 0 },
+#endif
+    { EOT },
+};
+
+static int		init_done = FALSE;
+
+/* local functions */
+static int map_gen_mode_num(int type, int color, int mode);
+static int probe_adapters(void);
+static void dump_buffer(u_char *buf, size_t len);
+
+#define	prologue(adp, flag, err)			\
+	if (!init_done || !((adp)->va_flags & (flag)))	\
+	    return (err)
+
+/* a backdoor for the console driver */
+static int
+gdc_configure(int flags)
+{
+    probe_adapters();
+    biosadapter[0].va_flags |= V_ADP_INITIALIZED;
+    if (!config_done(&biosadapter[0])) {
+	if (vid_register(&biosadapter[0]) < 0)
+	    return 1;
+	biosadapter[0].va_flags |= V_ADP_REGISTERED;
+    }
+
+    return 1;
+}
+
+/* local subroutines */
+
+/* map a generic video mode to a known mode number */
+static int
+map_gen_mode_num(int type, int color, int mode)
+{
+    static struct {
+	int from;
+	int to;
+    } mode_map[] = {
+	{ M_TEXT_80x25,	M_PC98_80x25, },
+#ifdef LINE30
+	{ M_TEXT_80x30,	M_PC98_80x30, },
+#endif
+    };
+    int i;
+
+    for (i = 0; i < sizeof(mode_map)/sizeof(mode_map[0]); ++i) {
+        if (mode_map[i].from == mode)
+            return mode_map[i].to;
+    }
+    return mode;
+}
+
+/* probe video adapters and return the number of detected adapters */
+static int
+probe_adapters(void)
+{
+    video_info_t info;
+
+    /* do this test only once */
+    if (init_done)
+	return 1;
+    init_done = TRUE;
+
+    biosadapter[0] = adapter_init_value[0];
+    biosadapter[0].va_flags |= V_ADP_PROBED;
+    biosadapter[0].va_initial_mode = biosadapter[0].va_initial_bios_mode;
+
+    master_gdc_wait_vsync();
+    master_gdc_cmd(_GDC_START);	/* text ON */
+    gdc_wait_vsync();
+    gdc_cmd(_GDC_STOP);		/* graphics OFF */
+
+    gdc_get_info(&biosadapter[0], biosadapter[0].va_initial_mode, &info);
+    biosadapter[0].va_mode_flags = info.vi_flags;
+    biosadapter[0].va_window = BIOS_PADDRTOVADDR(info.vi_window);
+    biosadapter[0].va_window_size = info.vi_window_size;
+    biosadapter[0].va_window_gran = info.vi_window_gran;
+    biosadapter[0].va_buffer = 0;
+    biosadapter[0].va_buffer_size = 0;
+
+    return 1;
+}
+
+static void master_gdc_cmd(unsigned int cmd)
+{
+    while ( (inb(IO_GDC1) & 2) != 0);
+    outb(IO_GDC1+2, cmd);
+}
+
+static void master_gdc_prm(unsigned int pmtr)
+{
+    while ( (inb(IO_GDC1) & 2) != 0);
+    outb(IO_GDC1, pmtr);
+}
+
+static void master_gdc_word_prm(unsigned int wpmtr)
+{
+    master_gdc_prm(wpmtr & 0x00ff);
+    master_gdc_prm((wpmtr >> 8) & 0x00ff);
+}	
+
+static void master_gdc_fifo_empty(void)
+{
+    while ( (inb(IO_GDC1) & 4) == 0);     
+}
+
+static void master_gdc_wait_vsync(void)
+{
+    while ( (inb(IO_GDC1) & 0x20) != 0);          
+    while ( (inb(IO_GDC1) & 0x20) == 0);          
+}
+
+static void gdc_cmd(unsigned int cmd)
+{
+    while ( (inb(IO_GDC2) & 2) != 0);
+    outb( IO_GDC2+2, cmd);
+}
+
+static void gdc_prm(unsigned int pmtr)
+{
+    while ( (inb(IO_GDC2) & 2) != 0);
+    outb( IO_GDC2, pmtr);
+}
+
+static void gdc_word_prm(unsigned int wpmtr)
+{
+    gdc_prm(wpmtr & 0x00ff);
+    gdc_prm((wpmtr >> 8) & 0x00ff);
+}
+
+static void gdc_fifo_empty(void)
+{
+    while ( (inb(IO_GDC2) & 0x04) == 0);          
+}
+
+static void gdc_wait_vsync(void)
+{
+    while ( (inb(IO_GDC2) & 0x20) != 0);          
+    while ( (inb(IO_GDC2) & 0x20) == 0);          
+}
+
+static int check_gdc_clock(void)
+{
+    if ((inb(IO_SYSPORT) & 0x80) == 0){
+       	return _5MHZ;
+    } else {
+       	return _2_5MHZ;
+    }
+}
+
+static void initialize_gdc(unsigned int mode)
+{
+    /* start 30line initialize */
+    int m_mode,s_mode,gdc_clock;
+    gdc_clock = check_gdc_clock();
+
+    if (mode == T25_G400){
+	m_mode = _25L;
+    }else{
+	m_mode = _30L;
+    }
+
+    s_mode = 2*mode+gdc_clock;
+
+    gdc_INFO = m_mode;
+
+    master_gdc_cmd(_GDC_RESET);
+    master_gdc_cmd(_GDC_MASTER);
+    gdc_cmd(_GDC_RESET);
+    gdc_cmd(_GDC_SLAVE);		
+
+    /* GDC Master */
+    master_gdc_cmd(_GDC_SYNC);
+    master_gdc_prm(0x00);	/* flush less */ /* text & graph */
+    master_gdc_prm(master_param[m_mode][GDC_CR]);
+    master_gdc_word_prm(((master_param[m_mode][GDC_HFP] << 10) 
+		     + (master_param[m_mode][GDC_VS] << 5) 
+		     + master_param[m_mode][GDC_HS]));
+    master_gdc_prm(master_param[m_mode][GDC_HBP]);
+    master_gdc_prm(master_param[m_mode][GDC_VFP]);
+    master_gdc_word_prm(((master_param[m_mode][GDC_VBP] << 10) 
+       		     + (master_param[m_mode][GDC_LF])));
+    master_gdc_fifo_empty();
+    master_gdc_cmd(_GDC_PITCH);
+    master_gdc_prm(MasterPCH);
+    master_gdc_fifo_empty();
+	
+    /* GDC slave */
+    gdc_cmd(_GDC_SYNC);
+    gdc_prm(0x06);
+    gdc_prm(slave_param[s_mode][GDC_CR]);
+    gdc_word_prm((slave_param[s_mode][GDC_HFP] << 10) 
+		+ (slave_param[s_mode][GDC_VS] << 5) 
+		+ (slave_param[s_mode][GDC_HS]));
+    gdc_prm(slave_param[s_mode][GDC_HBP]);
+    gdc_prm(slave_param[s_mode][GDC_VFP]);
+    gdc_word_prm((slave_param[s_mode][GDC_VBP] << 10) 
+		+ (slave_param[s_mode][GDC_LF]));
+    gdc_fifo_empty();
+    gdc_cmd(_GDC_PITCH);
+    gdc_prm(SlavePCH[gdc_clock]);
+    gdc_fifo_empty();
+
+    /* set Master GDC scroll param */
+    master_gdc_wait_vsync();
+    master_gdc_wait_vsync();
+    master_gdc_wait_vsync();
+    master_gdc_cmd(_GDC_SCROLL);
+    master_gdc_word_prm(0);
+    master_gdc_word_prm((master_param[m_mode][GDC_LF] << 4) | 0x0000);
+    master_gdc_fifo_empty();
+
+    /* set Slave GDC scroll param */
+    gdc_wait_vsync();
+    gdc_cmd(_GDC_SCROLL);
+    gdc_word_prm(0);
+    if (gdc_clock == _5MHZ){
+	gdc_word_prm((SlaveScrlLF[mode] << 4)  | 0x4000);
+    }else{
+	gdc_word_prm(SlaveScrlLF[mode] << 4);
+    }
+    gdc_fifo_empty();
+
+    gdc_word_prm(0);
+    if (gdc_clock == _5MHZ){
+	gdc_word_prm((SlaveScrlLF[mode] << 4)  | 0x4000);
+    }else{
+	gdc_word_prm(SlaveScrlLF[mode] << 4);
+    }
+    gdc_fifo_empty();
+
+    /* sync start */
+    gdc_cmd(_GDC_STOP);
+
+    gdc_wait_vsync();
+    gdc_wait_vsync();
+    gdc_wait_vsync();
+
+    master_gdc_cmd(_GDC_START);
+}
+
+/* entry points */
+
+static int
+gdc_nop(void)
+{
+    return 0;
+}
+
+static int
+gdc_probe(int unit, video_adapter_t **adpp, void *arg, int flags)
+{
+    probe_adapters();
+    if (unit >= 1)
+	return ENXIO;
+
+    *adpp = &biosadapter[unit];
+
+    return 0;
+}
+
+static int
+gdc_init(int unit, video_adapter_t *adp, int flags)
+{
+    if ((unit >= 1) || (adp == NULL) || !probe_done(adp))
+	return ENXIO;
+
+    if (!init_done(adp)) {
+	/* nothing to do really... */
+	adp->va_flags |= V_ADP_INITIALIZED;
+    }
+
+    if (!config_done(adp)) {
+	if (vid_register(adp) < 0)
+		return ENXIO;
+	adp->va_flags |= V_ADP_REGISTERED;
+    }
+
+    return 0;
+}
+
+/*
+ * get_info():
+ * Return the video_info structure of the requested video mode.
+ */
+static int
+gdc_get_info(video_adapter_t *adp, int mode, video_info_t *info)
+{
+    int i;
+
+    if (!init_done)
+	return 1;
+
+    mode = map_gen_mode_num(adp->va_type, adp->va_flags & V_ADP_COLOR, mode);
+    for (i = 0; bios_vmode[i].vi_mode != EOT; ++i) {
+	if (bios_vmode[i].vi_mode == NA)
+	    continue;
+	if (mode == bios_vmode[i].vi_mode) {
+	    *info = bios_vmode[i];
+	    return 0;
+	}
+    }
+    return 1;
+}
+
+/*
+ * query_mode():
+ * Find a video mode matching the requested parameters.
+ * Fields filled with 0 are considered "don't care" fields and
+ * match any modes.
+ */
+static int
+gdc_query_mode(video_adapter_t *adp, video_info_t *info)
+{
+    video_info_t buf;
+    int i;
+
+    if (!init_done)
+	return -1;
+
+    for (i = 0; bios_vmode[i].vi_mode != EOT; ++i) {
+	if (bios_vmode[i].vi_mode == NA)
+	    continue;
+
+	if ((info->vi_width != 0)
+	    && (info->vi_width != bios_vmode[i].vi_width))
+		continue;
+	if ((info->vi_height != 0)
+	    && (info->vi_height != bios_vmode[i].vi_height))
+		continue;
+	if ((info->vi_cwidth != 0)
+	    && (info->vi_cwidth != bios_vmode[i].vi_cwidth))
+		continue;
+	if ((info->vi_cheight != 0)
+	    && (info->vi_cheight != bios_vmode[i].vi_cheight))
+		continue;
+	if ((info->vi_depth != 0)
+	    && (info->vi_depth != bios_vmode[i].vi_depth))
+		continue;
+	if ((info->vi_planes != 0)
+	    && (info->vi_planes != bios_vmode[i].vi_planes))
+		continue;
+	/* XXX: should check pixel format, memory model */
+	if ((info->vi_flags != 0)
+	    && (info->vi_flags != bios_vmode[i].vi_flags))
+		continue;
+
+	/* verify if this mode is supported on this adapter */
+	if (gdc_get_info(adp, bios_vmode[i].vi_mode, &buf))
+		continue;
+	return bios_vmode[i].vi_mode;
+    }
+    return -1;
+}
+
+/*
+ * set_mode():
+ * Change the video mode.
+ */
+static int
+gdc_set_mode(video_adapter_t *adp, int mode)
+{
+    video_info_t info;
+
+    prologue(adp, V_ADP_MODECHANGE, 1);
+
+    mode = map_gen_mode_num(adp->va_type, 
+			    adp->va_flags & V_ADP_COLOR, mode);
+    if (gdc_get_info(adp, mode, &info))
+	return 1;
+
+#ifdef LINE30
+    switch (scp->mode) {
+       	case M_PC98_80x25:	/* VGA TEXT MODES */
+		initialize_gdc(T25_G400);
+		break;
+	case M_PC98_80x30:
+		initialize_gdc(T30_G400);
+		break;
+	default:
+		break;
+    }
+#endif
+
+    adp->va_mode = mode;
+    adp->va_mode_flags = info.vi_flags;
+    adp->va_flags &= ~V_ADP_COLOR;
+    adp->va_flags |= 
+	(info.vi_flags & V_INFO_COLOR) ? V_ADP_COLOR : 0;
+#if 0
+    adp->va_crtc_addr =
+	(adp->va_flags & V_ADP_COLOR) ? COLOR_CRTC : MONO_CRTC;
+#endif
+    adp->va_window = BIOS_PADDRTOVADDR(info.vi_window);
+    adp->va_window_size = info.vi_window_size;
+    adp->va_window_gran = info.vi_window_gran;
+    if (info.vi_buffer_size == 0) {
+    	adp->va_buffer = 0;
+    	adp->va_buffer_size = 0;
+    } else {
+    	adp->va_buffer = BIOS_PADDRTOVADDR(info.vi_buffer);
+    	adp->va_buffer_size = info.vi_buffer_size;
+    }
+
+    /* move hardware cursor out of the way */
+    (*vidsw[adp->va_index]->set_hw_cursor)(adp, -1, -1);
+
+    return 0;
+}
+
+/*
+ * set_border():
+ * Change the border color.
+ */
+static int
+gdc_set_border(video_adapter_t *adp, int color)
+{
+    outb(0x6c, color << 4);                                                 
+    return 0;
+}
+
+/*
+ * save_state():
+ * Read video card register values.
+ */
+static int
+gdc_save_state(video_adapter_t *adp, void *p, size_t size)
+{
+    return 1;
+}
+
+/*
+ * load_state():
+ * Set video card registers at once.
+ */
+static int
+gdc_load_state(video_adapter_t *adp, void *p)
+{
+    return 1;
+}
+
+/*
+ * read_hw_cursor():
+ * Read the position of the hardware text cursor.
+ */
+static int
+gdc_read_hw_cursor(video_adapter_t *adp, int *col, int *row)
+{
+    video_info_t info;
+    u_int16_t off;
+    int s;
+
+    if (!init_done)
+	return 1;
+
+    (*vidsw[adp->va_index]->get_info)(adp, adp->va_mode, &info);
+    if (info.vi_flags & V_INFO_GRAPHICS)
+	return 1;
+
+    s = spltty();
+    master_gdc_cmd(0xe0);	/* _GDC_CSRR */
+    while((inb(TEXT_GDC + 0) & 0x1) == 0) {}	/* GDC wait */
+    off = inb(TEXT_GDC + 2);			/* EADl */
+    off |= (inb(TEXT_GDC + 2) << 8);		/* EADh */
+    inb(TEXT_GDC + 2);				/* dummy */
+    inb(TEXT_GDC + 2);				/* dummy */
+    inb(TEXT_GDC + 2);				/* dummy */
+    splx(s);
+
+    if (off >= ROW*COL)
+	off = 0;
+    *row = off / info.vi_width;
+    *col = off % info.vi_width;
+
+    return 0;
+}
+
+/*
+ * set_hw_cursor():
+ * Move the hardware text cursor.  If col and row are both -1, 
+ * the cursor won't be shown.
+ */
+static int
+gdc_set_hw_cursor(video_adapter_t *adp, int col, int row)
+{
+    video_info_t info;
+    u_int16_t off;
+    int s;
+
+    if (!init_done)
+	return 1;
+
+    if ((col == -1) && (row == -1)) {
+	off = -1;
+    } else {
+	(*vidsw[adp->va_index]->get_info)(adp, adp->va_mode, &info);
+	if (info.vi_flags & V_INFO_GRAPHICS)
+	    return 1;
+	off = row*info.vi_width + col;
+    }
+
+    s = spltty();
+    master_gdc_cmd(0x49);	/* _GDC_CSRW */
+    master_gdc_word_prm(off);
+    splx(s);
+
+    return 0;
+}
+
+/*
+ * set_hw_cursor_shape():
+ * Change the shape of the hardware text cursor.  If the height is zero
+ * or negative, the cursor won't be shown.
+ */
+static int
+gdc_set_hw_cursor_shape(video_adapter_t *adp, int base, int height,
+			int celsize, int blink)
+{
+    int start;
+    int end;
+    int s;
+
+    start = celsize - (base + height);
+    end = celsize - base - 1;
+    /*
+     * muPD7220 GDC has anomaly that if end == celsize - 1 then start
+     * must be 0, otherwise the cursor won't be correctly shown 
+     * in the first row in the screen.  We shall set end to celsize - 2;
+     * if end == celsize -1 && start > 0. XXX
+     */
+    if ((end == celsize - 1) && (start > 0))
+	--end;
+
+    s = spltty();
+    master_gdc_cmd(0x4b);			/* _GDC_CSRFORM */
+    master_gdc_prm(((height > 0) ? 0x80 : 0)	/* cursor on/off */
+	| (celsize - 1) & 0x1f);		/* cel size */
+    master_gdc_word_prm(((end & 0x1f) << 11)	/* end line */
+	| (12 << 6)				/* blink rate */
+	| (blink ? 0x20 : 0)			/* blink on/off */
+	| (start & 0x1f));			/* start line */
+    splx(s);
+
+    return 1;
+}
+
+static void
+dump_buffer(u_char *buf, size_t len)
+{
+    int i;
+
+    for(i = 0; i < len;) {
+	printf("%02x ", buf[i]);
+	if ((++i % 16) == 0)
+	    printf("\n");
+    }
+}
+
+/*
+ * mmap():
+ * Mmap frame buffer.
+ */
+static int
+gdc_mmap(video_adapter_t *adp, vm_offset_t offset)
+{
+    if (offset > 0x48000 - PAGE_SIZE)
+	return -1;
+    return i386_btop((VIDEO_BUF_BASE + offset));
+}
+
+/*
+ * diag():
+ * Print some information about the video adapter and video modes,
+ * with requested level of details.
+ */
+static int
+gdc_diag(video_adapter_t *adp, int level)
+{
+    video_info_t info;
+    int i;
+
+    if (!init_done)
+	return 1;
+
+    fb_dump_adp_info(DRIVER_NAME, adp, level);
+
+#if FB_DEBUG > 1
+    for (i = 0; bios_vmode[i].vi_mode != EOT; ++i) {
+	 if (bios_vmode[i].vi_mode == NA)
+	    continue;
+	 if (get_mode_param(bios_vmode[i].vi_mode) == NULL)
+	    continue;
+	 fb_dump_mode_info(DRIVER_NAME, adp, &bios_vmode[i], level);
+    }
+#endif
+
+    return 0;
+}
+
+static int
+gdc_err(video_adapter_t *adp, ...)
+{
+	return 0;
+}
+
+#endif /* NGDC > 0 */