banner.c

Simple Operating Systems （简称SOS）是一个可以运行在X86平台上（包括QEMU

/* Copyright (C) 2005 David Decotigny

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA. 
*/

#include <crt.h>
#include <libc.h>
#include <string.h>
#include <stdarg.h>
#include <debug.h>

/**
 * @file banner.c
 *
 * Basic tests demonstrating how to create multithreaded processes
 */

static char *str1 =
"  _   _          _   _                 ___                           _     _                                 _       _     _ "
" | | | |   ___  | | | |   ___         |_ _|     __ _   _ __ ___     | |_  | |__    _ __    ___    __ _    __| |     / |   | |"
" | |_| |  / _ \\ | | | |  / _ \\         | |     / _` | | '_ ` _ \\    | __| | '_ \\  | '__|  / _ \\  / _` |  / _` |     | |   | |"
" |  _  | |  __/ | | | | | (_) |  _     | |    | (_| | | | | | | |   | |_  | | | | | |    |  __/ | (_| | | (_| |     | |   |_|"
" |_| |_|  \\___| |_| |_|  \\___/  ( )   |___|    \\__,_| |_| |_| |_|    \\__| |_| |_| |_|     \\___|  \\__,_|  \\__,_|     |_|   (_)"
"                                |/                                                                                           ";

static char *str2 =
"  _   _          _   _                 ___                           _     _                                 _       ____      _ "
" | | | |   ___  | | | |   ___         |_ _|     __ _   _ __ ___     | |_  | |__    _ __    ___    __ _    __| |     |___ \\    | |"
" | |_| |  / _ \\ | | | |  / _ \\         | |     / _` | | '_ ` _ \\    | __| | '_ \\  | '__|  / _ \\  / _` |  / _` |       __) |   | |"
" |  _  | |  __/ | | | | | (_) |  _     | |    | (_| | | | | | | |   | |_  | | | | | |    |  __/ | (_| | | (_| |      / __/    |_|"
" |_| |_|  \\___| |_| |_|  \\___/  ( )   |___|    \\__,_| |_| |_| |_|    \\__| |_| |_| |_|     \\___|  \\__,_|  \\__,_|     |_____|   (_)"
"                                |/                                                                                               ";

/**
 * Structure of a character in the x86 video memory mapping (text mode)
 */
static struct x86_videomem_char
{
  unsigned char character;
  unsigned char attribute;
} * video;


static void print(int line, int col, char c, unsigned char attr)
{
   video[line*80 + col].character = c;
   video[line*80 + col].attribute = attr;
}


/**
 * Helper function that scrolls the given string on the screen
 */
static void print_banner(int top_line, const char * str, int nlines,
			 unsigned char attr, unsigned pause_ms,
			 int direction)
{
  int nbcols = strnlen(str, 16384) / nlines;
  int base_char = 0;

  while (1)
    {
      int col;

      for (col = 0 ; col < 80 ; col ++)
	{
	  int col_in_str = (col + base_char) % (nbcols + 20);
	  int line;

	  for (line = 0 ; line < nlines ; line ++)
	    if (col_in_str < nbcols)
	      print(top_line + line, col, str[line*nbcols + col_in_str], attr);
	    else
	      print(top_line + line, col, ' ', attr);
	}

      _sos_nanosleep(0, pause_ms * 1000000);

      if (direction > 0)
	base_char ++;
      else
	base_char --;

      if (base_char < 0)
	base_char = nbcols + 20 - 1;
    }
}


struct thread_param
{
  int top_line;
  const char * str;
  int nlines;
  unsigned char attr;
  unsigned int pause_ms;
  int direction;
};


static void banner_thread(const struct thread_param *p)
{
  print_banner(p->top_line, p->str, p->nlines, p->attr,
	       p->pause_ms, p->direction);
}

static struct thread_param p1, p2;
int main()
{
  /* Map the x86 text-mode framebuffer in user space */
  video = fakemmap(0, 4096,
		   PROT_READ | PROT_WRITE,
		   MAP_SHARED,
		   "/dev/mem", 0xb8000);

  p1.top_line  = 3;
  p1.str       = str1;
  p1.nlines    = 6;
  p1.attr      = 14 | (7 << 4);
  p1.pause_ms  = 10;
  p1.direction = 1;
  _sos_new_thread((sos_thread_func_t*)banner_thread, (void*) & p1, 8192);

  p2.top_line  = 10;
  p2.str       = str2;
  p2.nlines    = 6;
  p2.attr      = (4 << 4) | (7 << 4);
  p2.pause_ms  = 20;
  p2.direction = -1;
  _sos_new_thread((sos_thread_func_t*)banner_thread, (void*) & p2, 8192);

  return 0;
}