--- /dev/null
+/*
+ * linux/drivers/video/mdacon.c -- Low level MDA based console driver
+ *
+ * (c) 1998 Andrew Apted <ajapted@netspace.net.au>
+ *
+ * including portions (c) 1995-1998 Patrick Caulfield.
+ *
+ * slight improvements (c) 2000 Edward Betts <edward@debian.org>
+ *
+ * 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.
+ *
+ * Changelog:
+ * Paul G. (03/2001) Fix mdacon= boot prompt to use __setup().
+ */
+
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/console.h>
+#include <linux/string.h>
+#include <linux/kd.h>
+#include <linux/vt_kern.h>
+#include <linux/vt_buffer.h>
+#include <linux/selection.h>
+#include <linux/spinlock.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/vga.h>
+
+static DEFINE_SPINLOCK(mda_lock);
+
+/* 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 */
+static unsigned int mda_status_port; /* Status and Config port */
+static unsigned int mda_gfx_port; /* Graphics control port */
+
+/* current hardware state */
+
+static int mda_cursor_loc=-1;
+static int mda_cursor_size_from=-1;
+static int mda_cursor_size_to=-1;
+
+static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;
+static char *mda_type_name;
+
+/* console information */
+
+static int mda_first_vc = 13;
+static int mda_last_vc = 16;
+
+static struct vc_data *mda_display_fg = NULL;
+
+module_param(mda_first_vc, int, 0);
+MODULE_PARM_DESC(mda_first_vc, "First virtual console. Default: 13");
+module_param(mda_last_vc, int, 0);
+MODULE_PARM_DESC(mda_last_vc, "Last virtual console. Default: 16");
+
+/* MDA register values
+ */
+
+#define MDA_CURSOR_BLINKING 0x00
+#define MDA_CURSOR_OFF 0x20
+#define MDA_CURSOR_SLOWBLINK 0x60
+
+#define MDA_MODE_GRAPHICS 0x02
+#define MDA_MODE_VIDEO_EN 0x08
+#define MDA_MODE_BLINK_EN 0x20
+#define MDA_MODE_GFX_PAGE1 0x80
+
+#define MDA_STATUS_HSYNC 0x01
+#define MDA_STATUS_VSYNC 0x80
+#define MDA_STATUS_VIDEO 0x08
+
+#define MDA_CONFIG_COL132 0x08
+#define MDA_GFX_MODE_EN 0x01
+#define MDA_GFX_PAGE_EN 0x02
+
+
+/*
+ * MDA could easily be classified as "pre-dinosaur hardware".
+ */
+
+static void write_mda_b(unsigned int val, unsigned char reg)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mda_lock, flags);
+
+ outb_p(reg, mda_index_port);
+ outb_p(val, mda_value_port);
+
+ spin_unlock_irqrestore(&mda_lock, flags);
+}
+
+static void write_mda_w(unsigned int val, unsigned char reg)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mda_lock, flags);
+
+ 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);
+
+ spin_unlock_irqrestore(&mda_lock, flags);
+}
+
+#ifdef TEST_MDA_B
+static int test_mda_b(unsigned char val, unsigned char reg)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mda_lock, flags);
+
+ outb_p(reg, mda_index_port);
+ outb (val, mda_value_port);
+
+ udelay(20); val = (inb_p(mda_value_port) == val);
+
+ spin_unlock_irqrestore(&mda_lock, flags);
+ return val;
+}
+#endif
+
+static inline void mda_set_cursor(unsigned int location)
+{
+ if (mda_cursor_loc == location)
+ return;
+
+ write_mda_w(location >> 1, 0x0e);
+
+ 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(MDA_CURSOR_OFF, 0x0a); /* disable cursor */
+ } else {
+ write_mda_b(from, 0x0a); /* cursor start */
+ write_mda_b(to, 0x0b); /* cursor end */
+ }
+
+ mda_cursor_size_from = from;
+ mda_cursor_size_to = to;
+}
+
+
+#ifndef MODULE
+static int __init mdacon_setup(char *str)
+{
+ /* command line format: mdacon=<first>,<last> */
+
+ int ints[3];
+
+ str = get_options(str, ARRAY_SIZE(ints), ints);
+
+ if (ints[0] < 2)
+ return 0;
+
+ if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES ||
+ ints[2] < 1 || ints[2] > MAX_NR_CONSOLES)
+ return 0;
+
+ mda_first_vc = ints[1];
+ mda_last_vc = ints[2];
+ return 1;
+}
+
+__setup("mdacon=", mdacon_setup);
+#endif
+
+static int mda_detect(void)
+{
+ int count=0;
+ u16 *p, p_save;
+ u16 *q, q_save;
+
+ /* do a memory check */
+
+ p = (u16 *) mda_vram_base;
+ q = (u16 *) (mda_vram_base + 0x01000);
+
+ p_save = scr_readw(p); q_save = scr_readw(q);
+
+ scr_writew(0xAA55, p); if (scr_readw(p) == 0xAA55) count++;
+ scr_writew(0x55AA, p); if (scr_readw(p) == 0x55AA) count++;
+ scr_writew(p_save, p);
+
+ if (count != 2) {
+ return 0;
+ }
+
+ /* check if we have 4K or 8K */
+
+ scr_writew(0xA55A, q); scr_writew(0x0000, p);
+ if (scr_readw(q) == 0xA55A) count++;
+
+ scr_writew(0x5AA5, q); scr_writew(0x0000, p);
+ if (scr_readw(q) == 0x5AA5) count++;
+
+ scr_writew(p_save, p); scr_writew(q_save, q);
+
+ if (count == 4) {
+ mda_vram_len = 0x02000;
+ }
+
+ /* Ok, there is definitely a card registering at the correct
+ * memory location, so now we do an I/O port test.
+ */
+
+#ifdef TEST_MDA_B
+ /* Edward: These two mess `tests' mess up my cursor on bootup */
+
+ /* cursor low register */
+ if (! test_mda_b(0x66, 0x0f)) {
+ return 0;
+ }
+
+ /* cursor low register */
+ if (! test_mda_b(0x99, 0x0f)) {
+ return 0;
+ }
+#endif
+
+ /* See if the card is a Hercules, by checking whether the vsync
+ * bit of the status register is changing. This test lasts for
+ * approximately 1/10th of a second.
+ */
+
+ p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;
+
+ for (count=0; count < 50000 && p_save == q_save; count++) {
+ q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;
+ udelay(2);
+ }
+
+ if (p_save != q_save) {
+ switch (inb_p(mda_status_port) & 0x70) {
+ case 0x10:
+ mda_type = TYPE_HERCPLUS;
+ mda_type_name = "HerculesPlus";
+ break;
+ case 0x50:
+ mda_type = TYPE_HERCCOLOR;
+ mda_type_name = "HerculesColor";
+ break;
+ default:
+ mda_type = TYPE_HERC;
+ mda_type_name = "Hercules";
+ break;
+ }
+ }
+
+ return 1;
+}
+
+static void mda_initialize(void)
+{
+ write_mda_b(97, 0x00); /* horizontal total */
+ write_mda_b(80, 0x01); /* horizontal displayed */
+ write_mda_b(82, 0x02); /* horizontal sync pos */
+ write_mda_b(15, 0x03); /* horizontal sync width */
+
+ write_mda_b(25, 0x04); /* vertical total */
+ write_mda_b(6, 0x05); /* vertical total adjust */
+ write_mda_b(25, 0x06); /* vertical displayed */
+ write_mda_b(25, 0x07); /* vertical sync pos */
+
+ write_mda_b(2, 0x08); /* interlace mode */
+ write_mda_b(13, 0x09); /* maximum scanline */
+ write_mda_b(12, 0x0a); /* cursor start */
+ write_mda_b(13, 0x0b); /* cursor end */
+
+ write_mda_w(0x0000, 0x0c); /* start address */
+ write_mda_w(0x0000, 0x0e); /* cursor location */
+
+ outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port);
+ outb_p(0x00, mda_status_port);
+ outb_p(0x00, mda_gfx_port);
+}
+
+static const char *mdacon_startup(void)
+{
+ mda_num_columns = 80;
+ mda_num_lines = 25;
+
+ mda_vram_len = 0x01000;
+ mda_vram_base = VGA_MAP_MEM(0xb0000, mda_vram_len);
+
+ mda_index_port = 0x3b4;
+ mda_value_port = 0x3b5;
+ mda_mode_port = 0x3b8;
+ mda_status_port = 0x3ba;
+ mda_gfx_port = 0x3bf;
+
+ mda_type = TYPE_MDA;
+ mda_type_name = "MDA";
+
+ if (! mda_detect()) {
+ printk("mdacon: MDA card not detected.\n");
+ return NULL;
+ }
+
+ if (mda_type != TYPE_MDA) {
+ mda_initialize();
+ }
+
+ /* cursor looks ugly during boot-up, so turn it off */
+ mda_set_cursor(mda_vram_len - 1);
+
+ printk("mdacon: %s with %ldK of memory detected.\n",
+ mda_type_name, 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(c, mda_num_columns, mda_num_lines);
+
+ /* make the first MDA console visible */
+
+ if (mda_display_fg == NULL)
+ mda_display_fg = c;
+}
+
+static void mdacon_deinit(struct vc_data *c)
+{
+ /* con_set_default_unimap(c->vc_num); */
+
+ if (mda_display_fg == c)
+ mda_display_fg = NULL;
+}
+
+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, u8 italic)
+{
+ /* 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) |
+ (!!italic << 4) |
+ ((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);
+ 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(scr_readw(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, int mode_switch)
+{
+ if (mda_type == TYPE_MDA) {
+ if (blank)
+ scr_memsetw((void *)mda_vram_base,
+ mda_convert_attr(c->vc_video_erase_char),
+ c->vc_screenbuf_size);
+ /* Tell console.c that it has to restore the screen itself */
+ return 1;
+ } else {
+ if (blank)
+ outb_p(0x00, mda_mode_port); /* disable video */
+ else
+ outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN,
+ mda_mode_port);
+ return 0;
+ }
+}
+
+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
+ */
+
+static const struct consw mda_con = {
+ .owner = THIS_MODULE,
+ .con_startup = mdacon_startup,
+ .con_init = mdacon_init,
+ .con_deinit = mdacon_deinit,
+ .con_clear = mdacon_clear,
+ .con_putc = mdacon_putc,
+ .con_putcs = mdacon_putcs,
+ .con_cursor = mdacon_cursor,
+ .con_scroll = mdacon_scroll,
+ .con_bmove = mdacon_bmove,
+ .con_switch = mdacon_switch,
+ .con_blank = mdacon_blank,
+ .con_set_palette = mdacon_set_palette,
+ .con_scrolldelta = mdacon_scrolldelta,
+ .con_build_attr = mdacon_build_attr,
+ .con_invert_region = mdacon_invert_region,
+};
+
+int __init mda_console_init(void)
+{
+ int err;
+
+ if (mda_first_vc > mda_last_vc)
+ return 1;
+ console_lock();
+ err = do_take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
+ console_unlock();
+ return err;
+}
+
+static void __exit mda_console_exit(void)
+{
+ give_up_console(&mda_con);
+}
+
+module_init(mda_console_init);
+module_exit(mda_console_exit);
+
+MODULE_LICENSE("GPL");
+
Code Review / kvmfornfv.git / blobdiff