cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
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mdacon.c (13276B)


      1/*
      2 *  linux/drivers/video/mdacon.c -- Low level MDA based console driver
      3 *
      4 *	(c) 1998 Andrew Apted <ajapted@netspace.net.au>
      5 *
      6 *      including portions (c) 1995-1998 Patrick Caulfield.
      7 *
      8 *      slight improvements (c) 2000 Edward Betts <edward@debian.org>
      9 *
     10 *  This file is based on the VGA console driver (vgacon.c):
     11 *	
     12 *	Created 28 Sep 1997 by Geert Uytterhoeven
     13 *
     14 *	Rewritten by Martin Mares <mj@ucw.cz>, July 1998
     15 *
     16 *  and on the old console.c, vga.c and vesa_blank.c drivers:
     17 *
     18 *	Copyright (C) 1991, 1992  Linus Torvalds
     19 *			    1995  Jay Estabrook
     20 *
     21 *  This file is subject to the terms and conditions of the GNU General Public
     22 *  License.  See the file COPYING in the main directory of this archive for
     23 *  more details.
     24 *
     25 *  Changelog:
     26 *  Paul G. (03/2001) Fix mdacon= boot prompt to use __setup().
     27 */
     28
     29#include <linux/types.h>
     30#include <linux/fs.h>
     31#include <linux/kernel.h>
     32#include <linux/module.h>
     33#include <linux/console.h>
     34#include <linux/string.h>
     35#include <linux/kd.h>
     36#include <linux/vt_kern.h>
     37#include <linux/vt_buffer.h>
     38#include <linux/selection.h>
     39#include <linux/spinlock.h>
     40#include <linux/ioport.h>
     41#include <linux/delay.h>
     42#include <linux/init.h>
     43
     44#include <asm/io.h>
     45#include <asm/vga.h>
     46
     47static DEFINE_SPINLOCK(mda_lock);
     48
     49/* description of the hardware layout */
     50
     51static u16		*mda_vram_base;		/* Base of video memory */
     52static unsigned long	mda_vram_len;		/* Size of video memory */
     53static unsigned int	mda_num_columns;	/* Number of text columns */
     54static unsigned int	mda_num_lines;		/* Number of text lines */
     55
     56static unsigned int	mda_index_port;		/* Register select port */
     57static unsigned int	mda_value_port;		/* Register value port */
     58static unsigned int	mda_mode_port;		/* Mode control port */
     59static unsigned int	mda_status_port;	/* Status and Config port */
     60static unsigned int	mda_gfx_port;		/* Graphics control port */
     61
     62/* current hardware state */
     63
     64static int	mda_cursor_loc=-1;
     65static int	mda_cursor_size_from=-1;
     66static int	mda_cursor_size_to=-1;
     67
     68static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;
     69static char *mda_type_name;
     70
     71/* console information */
     72
     73static int	mda_first_vc = 13;
     74static int	mda_last_vc  = 16;
     75
     76static struct vc_data	*mda_display_fg = NULL;
     77
     78module_param(mda_first_vc, int, 0);
     79MODULE_PARM_DESC(mda_first_vc, "First virtual console. Default: 13");
     80module_param(mda_last_vc, int, 0);
     81MODULE_PARM_DESC(mda_last_vc, "Last virtual console. Default: 16");
     82
     83/* MDA register values
     84 */
     85
     86#define MDA_CURSOR_BLINKING	0x00
     87#define MDA_CURSOR_OFF		0x20
     88#define MDA_CURSOR_SLOWBLINK	0x60
     89
     90#define MDA_MODE_GRAPHICS	0x02
     91#define MDA_MODE_VIDEO_EN	0x08
     92#define MDA_MODE_BLINK_EN	0x20
     93#define MDA_MODE_GFX_PAGE1	0x80
     94
     95#define MDA_STATUS_HSYNC	0x01
     96#define MDA_STATUS_VSYNC	0x80
     97#define MDA_STATUS_VIDEO	0x08
     98
     99#define MDA_CONFIG_COL132	0x08
    100#define MDA_GFX_MODE_EN		0x01
    101#define MDA_GFX_PAGE_EN		0x02
    102
    103
    104/*
    105 * MDA could easily be classified as "pre-dinosaur hardware".
    106 */
    107
    108static void write_mda_b(unsigned int val, unsigned char reg)
    109{
    110	unsigned long flags;
    111
    112	spin_lock_irqsave(&mda_lock, flags);	
    113
    114	outb_p(reg, mda_index_port); 
    115	outb_p(val, mda_value_port);
    116
    117	spin_unlock_irqrestore(&mda_lock, flags);
    118}
    119
    120static void write_mda_w(unsigned int val, unsigned char reg)
    121{
    122	unsigned long flags;
    123
    124	spin_lock_irqsave(&mda_lock, flags);
    125
    126	outb_p(reg,   mda_index_port); outb_p(val >> 8,   mda_value_port);
    127	outb_p(reg+1, mda_index_port); outb_p(val & 0xff, mda_value_port);
    128
    129	spin_unlock_irqrestore(&mda_lock, flags);
    130}
    131
    132#ifdef TEST_MDA_B
    133static int test_mda_b(unsigned char val, unsigned char reg)
    134{
    135	unsigned long flags;
    136
    137	spin_lock_irqsave(&mda_lock, flags);
    138
    139	outb_p(reg, mda_index_port); 
    140	outb  (val, mda_value_port);
    141
    142	udelay(20); val = (inb_p(mda_value_port) == val);
    143
    144	spin_unlock_irqrestore(&mda_lock, flags);
    145	return val;
    146}
    147#endif
    148
    149static inline void mda_set_cursor(unsigned int location) 
    150{
    151	if (mda_cursor_loc == location)
    152		return;
    153
    154	write_mda_w(location >> 1, 0x0e);
    155
    156	mda_cursor_loc = location;
    157}
    158
    159static inline void mda_set_cursor_size(int from, int to)
    160{
    161	if (mda_cursor_size_from==from && mda_cursor_size_to==to)
    162		return;
    163	
    164	if (from > to) {
    165		write_mda_b(MDA_CURSOR_OFF, 0x0a);	/* disable cursor */
    166	} else {
    167		write_mda_b(from, 0x0a);	/* cursor start */
    168		write_mda_b(to,   0x0b);	/* cursor end */
    169	}
    170
    171	mda_cursor_size_from = from;
    172	mda_cursor_size_to   = to;
    173}
    174
    175
    176#ifndef MODULE
    177static int __init mdacon_setup(char *str)
    178{
    179	/* command line format: mdacon=<first>,<last> */
    180
    181	int ints[3];
    182
    183	str = get_options(str, ARRAY_SIZE(ints), ints);
    184
    185	if (ints[0] < 2)
    186		return 0;
    187
    188	if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES || 
    189	    ints[2] < 1 || ints[2] > MAX_NR_CONSOLES)
    190		return 0;
    191
    192	mda_first_vc = ints[1];
    193	mda_last_vc  = ints[2];
    194	return 1;
    195}
    196
    197__setup("mdacon=", mdacon_setup);
    198#endif
    199
    200static int mda_detect(void)
    201{
    202	int count=0;
    203	u16 *p, p_save;
    204	u16 *q, q_save;
    205
    206	/* do a memory check */
    207
    208	p = mda_vram_base;
    209	q = mda_vram_base + 0x01000 / 2;
    210
    211	p_save = scr_readw(p);
    212	q_save = scr_readw(q);
    213
    214	scr_writew(0xAA55, p);
    215	if (scr_readw(p) == 0xAA55)
    216		count++;
    217
    218	scr_writew(0x55AA, p);
    219	if (scr_readw(p) == 0x55AA)
    220		count++;
    221
    222	scr_writew(p_save, p);
    223
    224	if (count != 2) {
    225		return 0;
    226	}
    227
    228	/* check if we have 4K or 8K */
    229
    230	scr_writew(0xA55A, q);
    231	scr_writew(0x0000, p);
    232	if (scr_readw(q) == 0xA55A)
    233		count++;
    234	
    235	scr_writew(0x5AA5, q);
    236	scr_writew(0x0000, p);
    237	if (scr_readw(q) == 0x5AA5)
    238		count++;
    239
    240	scr_writew(p_save, p);
    241	scr_writew(q_save, q);
    242	
    243	if (count == 4) {
    244		mda_vram_len = 0x02000;
    245	}
    246	
    247	/* Ok, there is definitely a card registering at the correct
    248	 * memory location, so now we do an I/O port test.
    249	 */
    250
    251#ifdef TEST_MDA_B
    252	/* Edward: These two mess `tests' mess up my cursor on bootup */
    253
    254	/* cursor low register */
    255	if (!test_mda_b(0x66, 0x0f))
    256		return 0;
    257
    258	/* cursor low register */
    259	if (!test_mda_b(0x99, 0x0f))
    260		return 0;
    261#endif
    262
    263	/* See if the card is a Hercules, by checking whether the vsync
    264	 * bit of the status register is changing.  This test lasts for
    265	 * approximately 1/10th of a second.
    266	 */
    267	
    268	p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;
    269
    270	for (count = 0; count < 50000 && p_save == q_save; count++) {
    271		q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;
    272		udelay(2);
    273	}
    274
    275	if (p_save != q_save) {
    276		switch (inb_p(mda_status_port) & 0x70) {
    277		case 0x10:
    278			mda_type = TYPE_HERCPLUS;
    279			mda_type_name = "HerculesPlus";
    280			break;
    281		case 0x50:
    282			mda_type = TYPE_HERCCOLOR;
    283			mda_type_name = "HerculesColor";
    284			break;
    285		default:
    286			mda_type = TYPE_HERC;
    287			mda_type_name = "Hercules";
    288			break;
    289		}
    290	}
    291
    292	return 1;
    293}
    294
    295static void mda_initialize(void)
    296{
    297	write_mda_b(97, 0x00);		/* horizontal total */
    298	write_mda_b(80, 0x01);		/* horizontal displayed */
    299	write_mda_b(82, 0x02);		/* horizontal sync pos */
    300	write_mda_b(15, 0x03);		/* horizontal sync width */
    301
    302	write_mda_b(25, 0x04);		/* vertical total */
    303	write_mda_b(6,  0x05);		/* vertical total adjust */
    304	write_mda_b(25, 0x06);		/* vertical displayed */
    305	write_mda_b(25, 0x07);		/* vertical sync pos */
    306
    307	write_mda_b(2,  0x08);		/* interlace mode */
    308	write_mda_b(13, 0x09);		/* maximum scanline */
    309	write_mda_b(12, 0x0a);		/* cursor start */
    310	write_mda_b(13, 0x0b);		/* cursor end */
    311
    312	write_mda_w(0x0000, 0x0c);	/* start address */
    313	write_mda_w(0x0000, 0x0e);	/* cursor location */
    314
    315	outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port);
    316	outb_p(0x00, mda_status_port);
    317	outb_p(0x00, mda_gfx_port);
    318}
    319
    320static const char *mdacon_startup(void)
    321{
    322	mda_num_columns = 80;
    323	mda_num_lines   = 25;
    324
    325	mda_vram_len  = 0x01000;
    326	mda_vram_base = (u16 *)VGA_MAP_MEM(0xb0000, mda_vram_len);
    327
    328	mda_index_port  = 0x3b4;
    329	mda_value_port  = 0x3b5;
    330	mda_mode_port   = 0x3b8;
    331	mda_status_port = 0x3ba;
    332	mda_gfx_port    = 0x3bf;
    333
    334	mda_type = TYPE_MDA;
    335	mda_type_name = "MDA";
    336
    337	if (! mda_detect()) {
    338		printk("mdacon: MDA card not detected.\n");
    339		return NULL;
    340	}
    341
    342	if (mda_type != TYPE_MDA) {
    343		mda_initialize();
    344	}
    345
    346	/* cursor looks ugly during boot-up, so turn it off */
    347	mda_set_cursor(mda_vram_len - 1);
    348
    349	printk("mdacon: %s with %ldK of memory detected.\n",
    350		mda_type_name, mda_vram_len/1024);
    351
    352	return "MDA-2";
    353}
    354
    355static void mdacon_init(struct vc_data *c, int init)
    356{
    357	c->vc_complement_mask = 0x0800;	 /* reverse video */
    358	c->vc_display_fg = &mda_display_fg;
    359
    360	if (init) {
    361		c->vc_cols = mda_num_columns;
    362		c->vc_rows = mda_num_lines;
    363	} else
    364		vc_resize(c, mda_num_columns, mda_num_lines);
    365
    366	/* make the first MDA console visible */
    367
    368	if (mda_display_fg == NULL)
    369		mda_display_fg = c;
    370}
    371
    372static void mdacon_deinit(struct vc_data *c)
    373{
    374	/* con_set_default_unimap(c->vc_num); */
    375
    376	if (mda_display_fg == c)
    377		mda_display_fg = NULL;
    378}
    379
    380static inline u16 mda_convert_attr(u16 ch)
    381{
    382	u16 attr = 0x0700;
    383
    384	/* Underline and reverse-video are mutually exclusive on MDA.
    385	 * Since reverse-video is used for cursors and selected areas,
    386	 * it takes precedence. 
    387	 */
    388
    389	if (ch & 0x0800)	attr = 0x7000;	/* reverse */
    390	else if (ch & 0x0400)	attr = 0x0100;	/* underline */
    391
    392	return ((ch & 0x0200) << 2) | 		/* intensity */ 
    393		(ch & 0x8000) |			/* blink */ 
    394		(ch & 0x00ff) | attr;
    395}
    396
    397static u8 mdacon_build_attr(struct vc_data *c, u8 color,
    398			    enum vc_intensity intensity,
    399			    bool blink, bool underline, bool reverse,
    400			    bool italic)
    401{
    402	/* The attribute is just a bit vector:
    403	 *
    404	 *	Bit 0..1 : intensity (0..2)
    405	 *	Bit 2    : underline
    406	 *	Bit 3    : reverse
    407	 *	Bit 7    : blink
    408	 */
    409
    410	return (intensity & VCI_MASK) |
    411		(underline << 2) |
    412		(reverse << 3) |
    413		(italic << 4) |
    414		(blink << 7);
    415}
    416
    417static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
    418{
    419	for (; count > 0; count--) {
    420		scr_writew(scr_readw(p) ^ 0x0800, p);
    421		p++;
    422	}
    423}
    424
    425static inline u16 *mda_addr(unsigned int x, unsigned int y)
    426{
    427	return mda_vram_base + y * mda_num_columns + x;
    428}
    429
    430static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
    431{
    432	scr_writew(mda_convert_attr(ch), mda_addr(x, y));
    433}
    434
    435static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
    436		         int count, int y, int x)
    437{
    438	u16 *dest = mda_addr(x, y);
    439
    440	for (; count > 0; count--) {
    441		scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
    442	}
    443}
    444
    445static void mdacon_clear(struct vc_data *c, int y, int x, 
    446			  int height, int width)
    447{
    448	u16 *dest = mda_addr(x, y);
    449	u16 eattr = mda_convert_attr(c->vc_video_erase_char);
    450
    451	if (width <= 0 || height <= 0)
    452		return;
    453
    454	if (x==0 && width==mda_num_columns) {
    455		scr_memsetw(dest, eattr, height*width*2);
    456	} else {
    457		for (; height > 0; height--, dest+=mda_num_columns)
    458			scr_memsetw(dest, eattr, width*2);
    459	}
    460}
    461                        
    462static int mdacon_switch(struct vc_data *c)
    463{
    464	return 1;	/* redrawing needed */
    465}
    466
    467static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
    468{
    469	if (mda_type == TYPE_MDA) {
    470		if (blank) 
    471			scr_memsetw(mda_vram_base,
    472				mda_convert_attr(c->vc_video_erase_char),
    473				c->vc_screenbuf_size);
    474		/* Tell console.c that it has to restore the screen itself */
    475		return 1;
    476	} else {
    477		if (blank)
    478			outb_p(0x00, mda_mode_port);	/* disable video */
    479		else
    480			outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, 
    481				mda_mode_port);
    482		return 0;
    483	}
    484}
    485
    486static void mdacon_cursor(struct vc_data *c, int mode)
    487{
    488	if (mode == CM_ERASE) {
    489		mda_set_cursor(mda_vram_len - 1);
    490		return;
    491	}
    492
    493	mda_set_cursor(c->state.y * mda_num_columns * 2 + c->state.x * 2);
    494
    495	switch (CUR_SIZE(c->vc_cursor_type)) {
    496
    497		case CUR_LOWER_THIRD:	mda_set_cursor_size(10, 13); break;
    498		case CUR_LOWER_HALF:	mda_set_cursor_size(7,  13); break;
    499		case CUR_TWO_THIRDS:	mda_set_cursor_size(4,  13); break;
    500		case CUR_BLOCK:		mda_set_cursor_size(1,  13); break;
    501		case CUR_NONE:		mda_set_cursor_size(14, 13); break;
    502		default:		mda_set_cursor_size(12, 13); break;
    503	}
    504}
    505
    506static bool mdacon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
    507		enum con_scroll dir, unsigned int lines)
    508{
    509	u16 eattr = mda_convert_attr(c->vc_video_erase_char);
    510
    511	if (!lines)
    512		return false;
    513
    514	if (lines > c->vc_rows)   /* maximum realistic size */
    515		lines = c->vc_rows;
    516
    517	switch (dir) {
    518
    519	case SM_UP:
    520		scr_memmovew(mda_addr(0, t), mda_addr(0, t + lines),
    521				(b-t-lines)*mda_num_columns*2);
    522		scr_memsetw(mda_addr(0, b - lines), eattr,
    523				lines*mda_num_columns*2);
    524		break;
    525
    526	case SM_DOWN:
    527		scr_memmovew(mda_addr(0, t + lines), mda_addr(0, t),
    528				(b-t-lines)*mda_num_columns*2);
    529		scr_memsetw(mda_addr(0, t), eattr, lines*mda_num_columns*2);
    530		break;
    531	}
    532
    533	return false;
    534}
    535
    536
    537/*
    538 *  The console `switch' structure for the MDA based console
    539 */
    540
    541static const struct consw mda_con = {
    542	.owner =		THIS_MODULE,
    543	.con_startup =		mdacon_startup,
    544	.con_init =		mdacon_init,
    545	.con_deinit =		mdacon_deinit,
    546	.con_clear =		mdacon_clear,
    547	.con_putc =		mdacon_putc,
    548	.con_putcs =		mdacon_putcs,
    549	.con_cursor =		mdacon_cursor,
    550	.con_scroll =		mdacon_scroll,
    551	.con_switch =		mdacon_switch,
    552	.con_blank =		mdacon_blank,
    553	.con_build_attr =	mdacon_build_attr,
    554	.con_invert_region =	mdacon_invert_region,
    555};
    556
    557int __init mda_console_init(void)
    558{
    559	int err;
    560
    561	if (mda_first_vc > mda_last_vc)
    562		return 1;
    563	console_lock();
    564	err = do_take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
    565	console_unlock();
    566	return err;
    567}
    568
    569static void __exit mda_console_exit(void)
    570{
    571	give_up_console(&mda_con);
    572}
    573
    574module_init(mda_console_init);
    575module_exit(mda_console_exit);
    576
    577MODULE_LICENSE("GPL");
    578