forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
578 lines
13 KiB
578 lines
13 KiB
/* |
|
* linux/drivers/video/mdacon.c -- Low level MDA based console driver |
|
* |
|
* (c) 1998 Andrew Apted <[email protected]> |
|
* |
|
* including portions (c) 1995-1998 Patrick Caulfield. |
|
* |
|
* slight improvements (c) 2000 Edward Betts <[email protected]> |
|
* |
|
* This file is based on the VGA console driver (vgacon.c): |
|
* |
|
* Created 28 Sep 1997 by Geert Uytterhoeven |
|
* |
|
* Rewritten by Martin Mares <[email protected]>, 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 u16 *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 = mda_vram_base; |
|
q = mda_vram_base + 0x01000 / 2; |
|
|
|
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 = (u16 *)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, |
|
enum vc_intensity intensity, |
|
bool blink, bool underline, bool reverse, |
|
bool 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 & VCI_MASK) | |
|
(underline << 2) | |
|
(reverse << 3) | |
|
(italic << 4) | |
|
(blink << 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++; |
|
} |
|
} |
|
|
|
static inline u16 *mda_addr(unsigned int x, unsigned int y) |
|
{ |
|
return 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 int mdacon_switch(struct vc_data *c) |
|
{ |
|
return 1; /* redrawing needed */ |
|
} |
|
|
|
static int mdacon_blank(struct vc_data *c, int blank, int mode_switch) |
|
{ |
|
if (mda_type == TYPE_MDA) { |
|
if (blank) |
|
scr_memsetw(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 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->state.y * mda_num_columns * 2 + c->state.x * 2); |
|
|
|
switch (CUR_SIZE(c->vc_cursor_type)) { |
|
|
|
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 bool mdacon_scroll(struct vc_data *c, unsigned int t, unsigned int b, |
|
enum con_scroll dir, unsigned int lines) |
|
{ |
|
u16 eattr = mda_convert_attr(c->vc_video_erase_char); |
|
|
|
if (!lines) |
|
return false; |
|
|
|
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 false; |
|
} |
|
|
|
|
|
/* |
|
* 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_switch = mdacon_switch, |
|
.con_blank = mdacon_blank, |
|
.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"); |
|
|
|
|