patch-2.1.124 linux/drivers/video/mdacon.c

• Lines: 469
• Date: Thu Oct 1 10:02:22 1998
• Orig file: v2.1.123/linux/drivers/video/mdacon.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.123/linux/drivers/video/mdacon.c linux/drivers/video/mdacon.c
@@ -0,0 +1,468 @@
+/*
+ *  linux/drivers/video/mdacon.c -- Low level MDA based console driver
+ *
+ *	(c) 1998 Andrew Apted <ajapted@netspace.net.au>
+ *
+ *  This file is based on the VGA console driver (vgacon.c):
+ *	
+ *	Created 28 Sep 1997 by Geert Uytterhoeven
+ *
+ *	Rewritten by Martin Mares <mj@ucw.cz>, July 1998
+ *
+ *  and on the old console.c, vga.c and vesa_blank.c drivers:
+ *
+ *	Copyright (C) 1991, 1992  Linus Torvalds
+ *			    1995  Jay Estabrook
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License.  See the file COPYING in the main directory of this archive for
+ *  more details.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/console.h>
+#include <linux/console_struct.h>
+#include <linux/string.h>
+#include <linux/kd.h>
+#include <linux/malloc.h>
+#include <linux/vt_kern.h>
+#include <linux/vt_buffer.h>
+#include <linux/selection.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/vga.h>
+
+
+/* description of the hardware layout */
+
+static unsigned long	mda_vram_base;		/* Base of video memory */
+static unsigned long	mda_vram_len;		/* Size of video memory */
+static unsigned int	mda_num_columns;	/* Number of text columns */
+static unsigned int	mda_num_lines;		/* Number of text lines */
+
+static unsigned int	mda_index_port;		/* Register select port */
+static unsigned int	mda_value_port;		/* Register value port */
+static unsigned int	mda_mode_port;		/* Mode control port */
+
+/* current hardware state */
+
+static int	mda_origin_loc=-1;
+static int	mda_cursor_loc=-1;
+static int	mda_cursor_size_from=-1;
+static int	mda_cursor_size_to=-1;
+
+/* console information */
+
+static int	mda_first_vc = 12;
+static int	mda_last_vc  = 15;
+
+static struct vc_data	*mda_display_fg = NULL;
+
+#ifdef MODULE_PARM
+MODULE_PARM(mda_first_vc, "0-255i");
+MODULE_PARM(mda_last_vc,  "0-255i");
+#endif
+
+
+/*
+ * MDA could easily be classified as "pre-dinosaur hardware".
+ */
+
+static void write_mda_b(unsigned char reg, unsigned int val)
+{
+	unsigned long flags;
+
+	save_flags(flags); cli();
+
+	outb_p(reg, mda_index_port); 
+	outb_p(val, mda_value_port);
+
+	restore_flags(flags);
+}
+
+static void write_mda_w(unsigned char reg, unsigned int val)
+{
+	unsigned long flags;
+
+	save_flags(flags); cli();
+
+	outb_p(reg,   mda_index_port); outb_p(val>>8,   mda_value_port);
+	outb_p(reg+1, mda_index_port); outb_p(val&0xff, mda_value_port);
+
+	restore_flags(flags);
+}
+
+static inline void mda_set_origin(unsigned int location)
+{
+	if (mda_origin_loc == location)
+		return;
+
+	write_mda_w(0x0c, location >> 1);
+
+	mda_origin_loc = location;
+}
+
+static inline void mda_set_cursor(unsigned int location) 
+{
+	if (mda_cursor_loc == location)
+		return;
+
+	write_mda_w(0x0e, location >> 1);
+
+	mda_cursor_loc = location;
+}
+
+static inline void mda_set_cursor_size(int from, int to)
+{
+	if (mda_cursor_size_from==from && mda_cursor_size_to==to)
+		return;
+	
+	if (from > to) {
+		write_mda_b(0x0a, 0x20);	/* disable cursor */
+	} else {
+		write_mda_b(0x0a, from);	/* cursor start */
+		write_mda_b(0x0b, to);		/* cursor end */
+	}
+
+	mda_cursor_size_from = from;
+	mda_cursor_size_to   = to;
+}
+
+
+#ifndef MODULE
+__initfunc(void mdacon_setup(char *str, int *ints))
+{
+	/* command line format: mdacon=<first>,<last> */
+
+	if (ints[0] < 2)
+		return;
+
+	if (ints[1] < 0 || ints[1] >= MAX_NR_CONSOLES || 
+	    ints[2] < 0 || ints[2] >= MAX_NR_CONSOLES)
+		return;
+
+	mda_first_vc = ints[1];
+	mda_last_vc  = ints[2];
+}
+#endif
+
+#ifdef MODULE
+static const char *mdacon_startup(void)
+#else
+__initfunc(static const char *mdacon_startup(void))
+#endif
+{
+	int count=0;
+	u16 saved;
+	u16 *p;
+
+	mda_num_columns = 80;
+	mda_num_lines   = 25;
+
+	mda_vram_base = VGA_MAP_MEM(0xb0000);
+	mda_vram_len  = 0x01000;
+
+	mda_index_port = 0x3b4;
+	mda_value_port = 0x3b5;
+	mda_mode_port  = 0x3b8;
+
+	/*  Make sure there is an MDA card present.
+	 *  Are there smarter methods around?
+	 */
+
+	p = (u16 *) mda_vram_base;
+	saved = scr_readw(p);
+
+	scr_writew(0xAA55, p); if (scr_readw(p) == 0xAA55) count++;
+	scr_writew(0x55AA, p); if (scr_readw(p) == 0x55AA) count++;
+	scr_writew(saved, p);
+
+	if (count != 2) {
+		printk("mdacon: MDA card not detected.");
+		return NULL;
+	}
+
+	printk("mdacon: MDA with %ldK of memory detected.\n",
+		mda_vram_len/1024);
+
+	return "MDA-2";
+}
+
+static void mdacon_init(struct vc_data *c, int init)
+{
+	c->vc_complement_mask = 0x0800;	 /* reverse video */
+	c->vc_display_fg = &mda_display_fg;
+
+	if (init) {
+		c->vc_cols = mda_num_columns;
+		c->vc_rows = mda_num_lines;
+	} else {
+		vc_resize_con(mda_num_lines, mda_num_columns, c->vc_num);
+        }
+	
+	/* make the first MDA console visible */
+
+	if (mda_display_fg == NULL)
+		mda_display_fg = c;
+
+	MOD_INC_USE_COUNT;
+}
+
+static void mdacon_deinit(struct vc_data *c)
+{
+	/* con_set_default_unimap(c->vc_num); */
+
+	if (mda_display_fg == c)
+		mda_display_fg = NULL;
+
+	MOD_DEC_USE_COUNT;
+}
+
+static inline u16 mda_convert_attr(u16 ch)
+{
+	u16 attr = 0x0700;
+
+	/* Underline and reverse-video are mutually exclusive on MDA.
+	 * Since reverse-video is used for cursors and selected areas,
+	 * it takes precedence. 
+	 */
+
+	if (ch & 0x0800)	attr = 0x7000;	/* reverse */
+	else if (ch & 0x0400)	attr = 0x0100;	/* underline */
+
+	return ((ch & 0x0200) << 2) | 		/* intensity */ 
+		(ch & 0x8000) |			/* blink */ 
+		(ch & 0x00ff) | attr;
+}
+
+static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity, 
+			    u8 blink, u8 underline, u8 reverse)
+{
+	/* The attribute is just a bit vector:
+	 *
+	 *	Bit 0..1 : intensity (0..2)
+	 *	Bit 2    : underline
+	 *	Bit 3    : reverse
+	 *	Bit 7    : blink
+	 */
+
+	return (intensity & 3) |
+		((underline & 1) << 2) |
+		((reverse   & 1) << 3) |
+		((blink     & 1) << 7);
+}
+
+static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
+{
+	for (; count > 0; count--) {
+		scr_writew(scr_readw(p) ^ 0x0800, p++);
+	}
+}
+
+#define MDA_ADDR(x,y)  ((u16 *) mda_vram_base + (y)*mda_num_columns + (x))
+
+static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
+{
+	scr_writew(mda_convert_attr(ch), MDA_ADDR(x, y));
+}
+
+static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
+		         int count, int y, int x)
+{
+	u16 *dest = MDA_ADDR(x, y);
+
+	for (; count > 0; count--) {
+		scr_writew(mda_convert_attr(*s++), dest++);
+	}
+}
+
+static void mdacon_clear(struct vc_data *c, int y, int x, 
+			  int height, int width)
+{
+	u16 *dest = MDA_ADDR(x, y);
+	u16 eattr = mda_convert_attr(c->vc_video_erase_char);
+
+	if (width <= 0 || height <= 0)
+		return;
+
+	if (x==0 && width==mda_num_columns) {
+		scr_memsetw(dest, eattr, height*width*2);
+	} else {
+		for (; height > 0; height--, dest+=mda_num_columns)
+			scr_memsetw(dest, eattr, width*2);
+	}
+}
+                        
+static void mdacon_bmove(struct vc_data *c, int sy, int sx, 
+			 int dy, int dx, int height, int width)
+{
+	u16 *src, *dest;
+
+	if (width <= 0 || height <= 0)
+		return;
+		
+	if (sx==0 && dx==0 && width==mda_num_columns) {
+		scr_memmovew(MDA_ADDR(0,dy), MDA_ADDR(0,sy), height*width*2);
+
+	} else if (dy < sy || (dy == sy && dx < sx)) {
+		src  = MDA_ADDR(sx, sy);
+		dest = MDA_ADDR(dx, dy);
+
+		for (; height > 0; height--) {
+			scr_memmovew(dest, src, width*2);
+			src  += mda_num_columns;
+			dest += mda_num_columns;
+		}
+	} else {
+		src  = MDA_ADDR(sx, sy+height-1);
+		dest = MDA_ADDR(dx, dy+height-1);
+
+		for (; height > 0; height--) {
+			scr_memmovew(dest, src, width*2);
+			src  -= mda_num_columns;
+			dest -= mda_num_columns;
+		}
+	}
+}
+
+static int mdacon_switch(struct vc_data *c)
+{
+	return 1;	/* redrawing needed */
+}
+
+static int mdacon_set_palette(struct vc_data *c, unsigned char *table)
+{
+	return -EINVAL;
+}
+
+static int mdacon_blank(struct vc_data *c, int blank)
+{
+	if (blank) {
+		outb_p(0x00, mda_mode_port);	/* disable video */
+	} else {
+		outb_p(0x28, mda_mode_port);	/* enable video & blinking */
+	}
+	
+	return 0;
+}
+
+static int mdacon_font_op(struct vc_data *c, struct console_font_op *op)
+{
+	return -ENOSYS;
+}
+
+static int mdacon_scrolldelta(struct vc_data *c, int lines)
+{
+	return 0;
+}
+
+static void mdacon_cursor(struct vc_data *c, int mode)
+{
+	if (mode == CM_ERASE) {
+		mda_set_cursor(mda_vram_len - 1);
+		return;
+	}
+
+	mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2);
+
+	switch (c->vc_cursor_type & 0x0f) {
+
+		case CUR_LOWER_THIRD:	mda_set_cursor_size(10, 13); break;
+		case CUR_LOWER_HALF:	mda_set_cursor_size(7,  13); break;
+		case CUR_TWO_THIRDS:	mda_set_cursor_size(4,  13); break;
+		case CUR_BLOCK:		mda_set_cursor_size(1,  13); break;
+		case CUR_NONE:		mda_set_cursor_size(14, 13); break;
+		default:		mda_set_cursor_size(12, 13); break;
+    }
+}
+
+static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
+{
+	u16 eattr = mda_convert_attr(c->vc_video_erase_char);
+
+	if (!lines)
+		return 0;
+
+	if (lines > c->vc_rows)   /* maximum realistic size */
+		lines = c->vc_rows;
+
+	switch (dir) {
+
+	case SM_UP:
+		scr_memmovew(MDA_ADDR(0,t), MDA_ADDR(0,t+lines),
+				(b-t-lines)*mda_num_columns*2);
+		scr_memsetw(MDA_ADDR(0,b-lines), eattr,
+				lines*mda_num_columns*2);
+		break;
+
+	case SM_DOWN:
+		scr_memmovew(MDA_ADDR(0,t+lines), MDA_ADDR(0,t),
+				(b-t-lines)*mda_num_columns*2);
+		scr_memsetw(MDA_ADDR(0,t), eattr, lines*mda_num_columns*2);
+		break;
+	}
+
+	return 0;
+}
+
+
+/*
+ *  The console `switch' structure for the MDA based console
+ */
+
+struct consw mda_con = {
+	mdacon_startup,		/* con_startup */
+	mdacon_init,		/* con_init */
+	mdacon_deinit,		/* con_deinit */
+	mdacon_clear,		/* con_clear */
+	mdacon_putc,		/* con_putc */
+	mdacon_putcs,		/* con_putcs */
+	mdacon_cursor,		/* con_cursor */
+	mdacon_scroll,		/* con_scroll */
+	mdacon_bmove,		/* con_bmove */
+	mdacon_switch,		/* con_switch */
+	mdacon_blank,		/* con_blank */
+	mdacon_font_op,		/* con_font_op */
+	mdacon_set_palette,	/* con_set_palette */
+	mdacon_scrolldelta,	/* con_scrolldelta */
+	NULL,			/* con_set_origin */
+	NULL,			/* con_save_screen */
+	mdacon_build_attr,	/* con_build_attr */
+	mdacon_invert_region,	/* con_invert_region */
+};
+
+#ifdef MODULE
+void mda_console_init(void)
+#else
+__initfunc(void mda_console_init(void))
+#endif
+{
+	if (mda_first_vc > mda_last_vc)
+		return;
+
+	take_over_console(&mda_con, mda_first_vc, mda_last_vc, 0);
+}
+
+#ifdef MODULE
+
+int init_module(void)
+{
+	mda_console_init();
+
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	give_up_console(&mda_con);
+}
+
+#endif