main.c

一个操作系统的源代码

/** main.c                                  
 **                                                              
 ** Original Author: Kasper Verdich Lund                         
 ** Date: 10.26.99     
 ** 
 ** Description:
 ** Main file for the microkernel     
 **                                       
 ** Revision History: 
 ** First version     
 **
 ** 0.0.1 10.26.99 Kasper Verdich Lund - (no comments)
 **
 ** 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 or 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                                    
 **                                                              
 *********************************************************Apostle OS**/

#include <types.h>
#include <mem.h>
#include <string.h>
#include <gdt.h>
#include <idt.h>
#include <pic.h>
#include <tss.h>
#include <multiboot.h>
#include <paging.h>
#include <exception.h>
#include <service.h>
#include <process.h>
#include <scheduler.h>
#include <address_space.h>
#include <halt.h>

#ifdef DEBUG
#include <debug/conio.h>
#endif

multibootInfo *bootInfo;

int main(multibootInfo *volatile_bootInfo)
{
  dword availableMemory;
#ifdef DEBUG
  DebugConsoleInit(COL_BLACK, COL_GRAY);
  DebugPrintF("Apostle microkernel 0.0.3\n");
#endif

  /* setup allocation routines for
   * allocation of physical pages */
  availableMemory = AvailableMemory(volatile_bootInfo);
  psetup(availableMemory, UsedMemory(volatile_bootInfo));
  setupPaging(availableMemory);
  enablePaging();
  /* malloc, calloc and free are now available */
  bootInfo = CopyMultibootInfo(volatile_bootInfo);

  reprogramPIC();
  setupGDT();
  setupIDT();
  setupTSS();

  setupExceptions();
  setupServices();
  setupScheduler();
#ifdef DEBUG
  DebugPrintF("Kernel setup complete\n");
#endif

  if (bootInfo->flags & MULTIBOOT_MODS)
    {
      int i;
      for(i = 0; i < bootInfo->modulesCount; i++)
        {
	  Process *mp = NewProcess();
#ifdef DEBUG
          DebugPrintF("Module %d: %s\n", i, bootInfo->modules[i].string);
#endif
	  map(systemSpace, (void *)bootInfo->modules[i].start, \
		mp->addressSpace, (void *)0x20000000, \
		(bootInfo->modules[i].end - bootInfo->modules[i].start + \
		 PAGE_SIZE - 1) >> 12,
                PAGE_USER | PAGE_WRITABLE | PAGE_PRESENT);
	  InsertProcess(&readyQueue, mp, FALSE);
	}
    }
  else
    {
#ifdef DEBUG
      DebugPrintF("No modules loaded\n");
#endif
      halt();
    }

  /* we now have a collection of processes 
   * in the readyQueue - setup scheduler to run them */
  Reallocate();  

  return 0;
}