fbcon.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 2,454 行 · 第 1/5 页

/*
 *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
 *
 *	Copyright (C) 1995 Geert Uytterhoeven
 *
 *
 *  This file is based on the original Amiga console driver (amicon.c):
 *
 *	Copyright (C) 1993 Hamish Macdonald
 *			   Greg Harp
 *	Copyright (C) 1994 David Carter [[e-mail]]
 *
 *	      with work by William Rucklidge ([e-mail])
 *			   Geert Uytterhoeven
 *			   Jes Sorensen ([e-mail])
 *			   Martin Apel
 *
 *  and on the original Atari console driver (atacon.c):
 *
 *	Copyright (C) 1993 Bjoern Brauel
 *			   Roman Hodek
 *
 *	      with work by Guenther Kelleter
 *			   Martin Schaller
 *			   Andreas Schwab
 *
 *  Hardware cursor support added by Emmanuel Marty ([e-mail])
 *  Smart redraw scrolling, arbitrary font width support, 512char font support
 *  and software scrollback added by 
 *                         Jakub Jelinek ([e-mail])
 *
 *  Random hacking by Martin Mares <[e-mail]>
 *
 *	2001 - Documented with DocBook
 *	- Brad Douglas <[e-mail]>
 *
 *  The low level operations for the various display memory organizations are
 *  now in separate source files.
 *
 *  Currently the following organizations are supported:
 *
 *    o afb			Amiga bitplanes
 *    o cfb{2,4,8,16,24,32}	Packed pixels
 *    o ilbm			Amiga interleaved bitplanes
 *    o iplan2p[248]		Atari interleaved bitplanes
 *    o mfb			Monochrome
 *    o vga			VGA characters/attributes
 *
 *  To do:
 *
 *    - Implement 16 plane mode (iplan2p16)
 *
 *
 *  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.
 */

#undef FBCONDEBUG

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/delay.h>	/* MSch: for IRQ probe */
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/string.h>
#include <linux/kd.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/vt_kern.h>
#include <linux/selection.h>
#include <linux/font.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/interrupt.h>

#include <asm/irq.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#ifdef CONFIG_ATARI
#include <asm/atariints.h>
#endif
#ifdef CONFIG_MAC
#include <asm/macints.h>
#endif
#if defined(__mc68000__) || defined(CONFIG_APUS)
#include <asm/machdep.h>
#include <asm/setup.h>
#endif

#include "fbcon.h"

#ifdef FBCONDEBUG
#  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
#else
#  define DPRINTK(fmt, args...)
#endif

struct display fb_display[MAX_NR_CONSOLES];
signed char con2fb_map[MAX_NR_CONSOLES];
static int logo_height;
static int logo_lines;
static int logo_shown = -1;
/* Software scrollback */
int fbcon_softback_size = 32768;
static unsigned long softback_buf, softback_curr;
static unsigned long softback_in;
static unsigned long softback_top, softback_end;
static int softback_lines;
/* console mappings */
static int first_fb_vc;
static int last_fb_vc = MAX_NR_CONSOLES - 1;
static int fbcon_is_default = 1; 
/* font data */
static char fontname[40];

/* current fb_info */
static int info_idx =  -1;

#define REFCOUNT(fd)	(((int *)(fd))[-1])
#define FNTSIZE(fd)	(((int *)(fd))[-2])
#define FNTCHARCNT(fd)	(((int *)(fd))[-3])
#define FNTSUM(fd)	(((int *)(fd))[-4])
#define FONT_EXTRA_WORDS 4

#define CM_SOFTBACK	(8)

#define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)

static void fbcon_free_font(struct display *);
static int fbcon_set_origin(struct vc_data *);

#define CURSOR_DRAW_DELAY		(1)

/* # VBL ints between cursor state changes */
#define ARM_CURSOR_BLINK_RATE		(10)
#define ATARI_CURSOR_BLINK_RATE		(42)
#define MAC_CURSOR_BLINK_RATE		(32)
#define DEFAULT_CURSOR_BLINK_RATE	(20)

static int vbl_cursor_cnt;

#define divides(a, b)	((!(a) || (b)%(a)) ? 0 : 1)

/*
 *  Interface used by the world
 */

static const char *fbcon_startup(void);
static void fbcon_init(struct vc_data *vc, int init);
static void fbcon_deinit(struct vc_data *vc);
static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
			int width);
static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
			int count, int ypos, int xpos);
static void fbcon_cursor(struct vc_data *vc, int mode);
static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
			int count);
static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
			int height, int width);
static int fbcon_switch(struct vc_data *vc);
static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
static int fbcon_set_palette(struct vc_data *vc, unsigned char *table);
static int fbcon_scrolldelta(struct vc_data *vc, int lines);
void accel_clear_margins(struct vc_data *vc, struct fb_info *info,
			 int bottom_only);


/*
 *  Internal routines
 */
static __inline__ int real_y(struct display *p, int ypos);
static __inline__ void ywrap_up(struct vc_data *vc, int count);
static __inline__ void ywrap_down(struct vc_data *vc, int count);
static __inline__ void ypan_up(struct vc_data *vc, int count);
static __inline__ void ypan_down(struct vc_data *vc, int count);
static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
			    int dy, int dx, int height, int width, u_int y_break);
static void fbcon_set_disp(struct fb_info *info, struct vc_data *vc);
static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
			      int line, int count, int dy);

#ifdef CONFIG_MAC
/*
 * On the Macintoy, there may or may not be a working VBL int. We need to probe
 */
static int vbl_detected;

static irqreturn_t fb_vbl_detect(int irq, void *dummy, struct pt_regs *fp)
{
	vbl_detected++;
	return IRQ_HANDLED;
}
#endif

static void fb_flashcursor(void *private)
{
	struct fb_info *info = (struct fb_info *) private;
	struct vc_data *vc = NULL;

	if (info->currcon != -1)
		vc = vc_cons[info->currcon].d;

	if (info->state != FBINFO_STATE_RUNNING ||
	    info->cursor.rop == ROP_COPY || !vc || !CON_IS_VISIBLE(vc)
	    || registered_fb[(int) con2fb_map[vc->vc_num]] != info)
		return;
	acquire_console_sem();
	info->cursor.enable ^= 1;
	info->fbops->fb_cursor(info, &info->cursor);
	release_console_sem();
}

#if (defined(__arm__) && defined(IRQ_VSYNCPULSE)) || defined(CONFIG_ATARI) || defined(CONFIG_MAC)
static int cursor_blink_rate;
static irqreturn_t fb_vbl_handler(int irq, void *dev_id, struct pt_regs *fp)
{
	struct fb_info *info = dev_id;

	if (vbl_cursor_cnt && --vbl_cursor_cnt == 0) {
		schedule_work(&info->queue);	
		vbl_cursor_cnt = cursor_blink_rate; 
	}
	return IRQ_HANDLED;
}
#endif
	
static void cursor_timer_handler(unsigned long dev_addr)
{
	struct fb_info *info = (struct fb_info *) dev_addr;
	
	schedule_work(&info->queue);
	mod_timer(&info->cursor_timer, jiffies + HZ/5);
}

int __init fb_console_setup(char *this_opt)
{
	char *options;
	int i, j;

	if (!this_opt || !*this_opt)
		return 0;

	while ((options = strsep(&this_opt, ",")) != NULL) {
		if (!strncmp(options, "font:", 5))
			strcpy(fontname, options + 5);
		
		if (!strncmp(options, "scrollback:", 11)) {
			options += 11;
			if (*options) {
				fbcon_softback_size = simple_strtoul(options, &options, 0);
				if (*options == 'k' || *options == 'K') {
					fbcon_softback_size *= 1024;
					options++;
				}
				if (*options != ',')
					return 0;
				options++;
			} else
				return 0;
		}
		
		if (!strncmp(options, "map:", 4)) {
			options += 4;
			if (*options)
				for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
					if (!options[j])
						j = 0;
					con2fb_map[i] = (options[j++]-'0') % FB_MAX;
				}
			return 0;
		}

		if (!strncmp(options, "vc:", 3)) {
			options += 3;
			if (*options)
				first_fb_vc = simple_strtoul(options, &options, 10) - 1;
			if (first_fb_vc < 0)
				first_fb_vc = 0;
			if (*options++ == '-')
				last_fb_vc = simple_strtoul(options, &options, 10) - 1;
			fbcon_is_default = 0; 
		}	
	}
	return 0;
}

__setup("fbcon=", fb_console_setup);

static int search_fb_in_map(int idx)
{
	int i;

	for (i = 0; i < MAX_NR_CONSOLES; i++) {
		if (con2fb_map[i] == idx)
			return 1;
	}
	return 0;
}

static int search_for_mapped_con(void)
{
	int i;

	for (i = 0; i < MAX_NR_CONSOLES; i++) {
		if (con2fb_map[i] != -1)
			return 1;
	}
	return 0;
}

static int fbcon_takeover(void)
{
	int err, i;

	if (!num_registered_fb)
		return -ENODEV;

	for (i = first_fb_vc; i <= last_fb_vc; i++)
		con2fb_map[i] = info_idx;

	err = take_over_console(&fb_con, first_fb_vc, last_fb_vc,
				fbcon_is_default);
	if (err) {
		for (i = first_fb_vc; i <= last_fb_vc; i++) {
			con2fb_map[i] = -1;
		}
		info_idx = -1;
	}

	return err;
}

/**
 *	set_con2fb_map - map console to frame buffer device
 *	@unit: virtual console number to map
 *	@newidx: frame buffer index to map virtual console to
 *
 *	Maps a virtual console @unit to a frame buffer device
 *	@newidx.
 */
static int set_con2fb_map(int unit, int newidx)
{
	struct vc_data *vc = vc_cons[unit].d;
	int oldidx = con2fb_map[unit];
	struct fb_info *info = registered_fb[newidx];
	struct fb_info *oldinfo = NULL;
	int found;

	if (oldidx == newidx)
		return 0;

	if (!vc)
	    return -ENODEV;

	if (!search_for_mapped_con()) {
		info_idx = newidx;
		return fbcon_takeover();
	}

	if (oldidx != -1)
		oldinfo = registered_fb[oldidx];

	found = search_fb_in_map(newidx);

	acquire_console_sem();
	con2fb_map[unit] = newidx;
	if (!found) {
		if (!try_module_get(info->fbops->owner)) {
			con2fb_map[unit] = oldidx;
			release_console_sem();
			return -ENODEV;
		}
		if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
			module_put(info->fbops->owner);
			con2fb_map[unit] = oldidx;
			release_console_sem();
			return -ENODEV;
		}
	}

	/*
	 * If old fb is not mapped to any of the consoles,
	 * fbcon should release it.
	 */
	if (oldinfo && !search_fb_in_map(oldidx)) {
		if (oldinfo->fbops->fb_release &&
		    oldinfo->fbops->fb_release(oldinfo, 0)) {
			con2fb_map[unit] = oldidx;
			if (!found && info->fbops->fb_release)
				info->fbops->fb_release(info, 0);
			if (!found)
				module_put(info->fbops->owner);
			release_console_sem();
			return -ENODEV;
		}
		if (oldinfo->queue.func == fb_flashcursor)
			del_timer_sync(&oldinfo->cursor_timer);
		module_put(oldinfo->fbops->owner);
	}
	info->currcon = -1;
	if (!found) {
		if (!info->queue.func || info->queue.func == fb_flashcursor) {
			if (!info->queue.func)
				INIT_WORK(&info->queue, fb_flashcursor, info);

			init_timer(&info->cursor_timer);
			info->cursor_timer.function = cursor_timer_handler;
			info->cursor_timer.expires = jiffies + HZ / 5;
			info->cursor_timer.data = (unsigned long ) info;
			add_timer(&info->cursor_timer);
		}
	}
	if (info->fbops->fb_set_par)
		info->fbops->fb_set_par(info);
	fbcon_set_disp(info, vc);
	release_console_sem();
	return 0;
}

/*
 * Accelerated handlers.
 */
static inline int get_color(struct vc_data *vc, struct fb_info *info,
			    u16 c, int is_fg)
{
	int depth = fb_get_color_depth(info);
	int color = 0;

	if (depth != 1)
		color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
			: attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);

	switch (depth) {
	case 1:
	{
		/* 0 or 1 */
		int fg = (info->fix.visual != FB_VISUAL_MONO01) ? 1 : 0;
		int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : 1;

		color = (is_fg) ? fg : bg;
		break;
	}
	case 2:
		/*
		 * Scale down 16-colors to 4 colors. Default 4-color palette
		 * is grayscale.
		 */
		color /= 4;
		break;
	case 3:
		/*
		 * Last 8 entries of default 16-color palette is a more intense
		 * version of the first 8 (i.e., same chrominance, different
		 * luminance).
		 */
		color &= 7;
		break;
	}

	return color;
}

#define FBCON_ATTRIBUTE_UNDERLINE 1
#define FBCON_ATTRIBUTE_REVERSE   2
#define FBCON_ATTRIBUTE_BOLD      4

static inline int get_attribute(struct fb_info *info, u16 c)
{
	int attribute = 0;

	if (fb_get_color_depth(info) == 1) {
		if (attr_underline(c))
			attribute |= FBCON_ATTRIBUTE_UNDERLINE;
		if (attr_reverse(c))
			attribute |= FBCON_ATTRIBUTE_REVERSE;
		if (attr_bold(c))
			attribute |= FBCON_ATTRIBUTE_BOLD;
	}

	return attribute;
}

static inline void update_attr(u8 *dst, u8 *src, int attribute,
			       struct vc_data *vc)
{