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#include <linux/init.h>
#include <linux/workqueue.h>
#include <linux/fb.h>
#include <linux/slab.h>
#define CONFIG_DISPLAY_FB 0
#define CONFIG_BOOT_PROCESS
//#define CONFIG_BOOT_PROCESS_BLOCK
#define CONFIG_BOOT_PROCESS_BAR
#define CONFIG_PROCESS_DURATION 10
static struct delayed_work boot_process_work;
static u32 palette[5] = {200, 203, 206, 209, 212};
static void draw_box(int x, int y, int width, int height, int color_index)
{
	struct fb_info * fb;
	struct fb_image process;
	char * data;
	if (color_index >= sizeof(palette) / sizeof(u32)) {
		printk("color_index out of range!\n");
		return ;
	}
	data = kmalloc(width * height, GFP_KERNEL);
	memset(data, color_index, width * height);
	process.dx = x;
	process.dy = y;
	process.width = width;
	process.height= height;
	process.data = data;
	process.depth = 8;
	fb = registered_fb[CONFIG_DISPLAY_FB];
	fb->pseudo_palette = palette;
	fb->fbops->fb_imageblit(fb, &process);
	kfree(data);
}
#if (defined CONFIG_BOOT_PROCESS_BAR) && (defined CONFIG_BOOT_PROCESS)
#define PROCESS_BLOCK_NUM 300
static void process_worker(struct work_struct * work)
{
	static unsigned long timestamp = 0;
	static int process_width;
	static int process_height;
	static int block_num_adjust;
	static int block_width;
	static int process_x;
	static int process_y;
	static int step;
	if ( registered_fb[CONFIG_DISPLAY_FB] == NULL ) {
		printk("Boot process: fb dev not inited, boot process not start!\n");
		return ;
	}
	/* fisrt call process_worker, set timestamp as jiffies */
	if (timestamp == 0) {
		int screen_width;
		int screen_height;
		timestamp = jiffies;
		step = 0;
		screen_width = registered_fb[CONFIG_DISPLAY_FB]->var.xres;
		screen_height = registered_fb[CONFIG_DISPLAY_FB]->var.yres;
		/* draw process bar background */
		process_width = screen_width * 4 / 5;
		process_height = screen_height / 10;
		process_x = (screen_width - process_width) / 2;
		process_y = screen_height - process_height * 2;
		block_width = process_width / PROCESS_BLOCK_NUM;
		block_num_adjust = process_width / block_width;
//		draw_box(process_x, process_y, process_width, process_height, 0);
		draw_box(process_x, process_y, block_width, process_height, 0);
	} else {
		int i;
		int current_x;
		step++;
		for (i = 0 ; i < 4; i++) {
			current_x = process_x + block_width * ( step -i );
			if (current_x >= (process_x + process_width - 2 * block_width) || current_x < process_x) {
				continue;
			}
			draw_box(current_x, process_y, block_width, process_height, i + 1);
		}
	}
	if (jiffies - timestamp > CONFIG_PROCESS_DURATION * HZ) {
		draw_box(process_x, process_y, process_width, process_height, 4);
		printk("Boot process: boot process end!\n"); //modefy by fck zlgmcu
		return ;
	}
	schedule_delayed_work(&boot_process_work, CONFIG_PROCESS_DURATION * HZ /
			(block_num_adjust) );
}
#endif
#if (defined CONFIG_BOOT_PROCESS_BLOCK) && (defined CONFIG_BOOT_PROCESS)
static void process_worker(struct work_struct * work)
{
	static unsigned long timestamp = 0;
	static int start_x;
	static int start_y;
	static int count = 0;
	int screen_width;
	int screen_height;
	int width;
	int height;
	int span;
	int tmp;
	int i;
	if ( registered_fb[CONFIG_DISPLAY_FB] == NULL ) {
		printk("Boot process: fb dev not inited, boot process not start!\n");
		return ;
	}
	screen_width = registered_fb[CONFIG_DISPLAY_FB]->var.xres;
	screen_height = registered_fb[CONFIG_DISPLAY_FB]->var.yres;
	/* draw process bar background */
	tmp = screen_width * 4 / 5;
	height = screen_height / 10;
	width = height;
	start_x = (screen_width - tmp) / 2;
	start_y = screen_height - height * 2;
	span = (tmp - width) / 4;
	/* fisrt call process_worker, set timestamp as jiffies */
	timestamp = (timestamp == 0) ? jiffies : timestamp;
	if (jiffies - timestamp > CONFIG_PROCESS_DURATION * HZ) {
		for (i = 0; i < 5; i++) {
			draw_box(start_x + i * span, start_y, width, height, 4);
		}
		printk("Boot process: boot process end!\n");
		return ;
	}
	tmp = ++count;
	count = tmp % 5;
	for (i = 0; i < 5; i++) {
		if (count == i) {
			draw_box(start_x + i * span, start_y, width, height, 4);
		} else {
			draw_box(start_x + i * span, start_y, width, height, 0);
		}
	}
	schedule_delayed_work(&boot_process_work, HZ);
}
#endif
int boot_process_init(void)
{
#if defined CONFIG_BOOT_PROCESS
	INIT_DELAYED_WORK(&boot_process_work, process_worker);
	schedule_delayed_work(&boot_process_work, HZ);
	printk("Boot process: init\n");
#endif
	return 0;
}
fs_initcall(boot_process_init);

$ grep boot_command_line -r drivers/
drivers/of/fdt.c:       of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
drivers/tty/hvc/hvc_vio.c:      if (!strstr(boot_command_line, "console="))
drivers/tty/serial/8250/8250_omap.c:    if (strstr(boot_command_line, "console=ttyS"))
drivers/tty/serial/8250/8250_omap.c:    omap_str = strstr(boot_command_line, "console=ttyO");
drivers/cpufreq/pmac32-cpufreq.c:       if (strstr(boot_command_line, "nocpufreq"))
$
$ grep boot_command_line -r --include "*.h"
include/linux/init.h:extern char __initdata boot_command_line[];
include/linux/init.h:/* Relies on boot_command_line being set */