main.c

一个微型操作系统源码

/*
 * main.c - main kernel entry point
 *
 * OSV
 * Copyright (C) 2002 Ciprian DOSOFTEI <[e-mail]>
 * All rights reserved.
 * 
 * http://backster.free.fr/osv
 *
 * This file is part of the OSV project. OSV is free software, also known as
 * "open source"; you can redistribute it and/or modify it under the terms 
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF). To explore alternate licensing terms, contact 
 * the author at [e-mail] or [phone].
 * 
 * OSV 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 GPL for more details.  You should have
 * received a copy of the GPL along with OSV; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */

#include <kernel.h>

struct cpuinfo_x86 boot_cpu_data = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };

int main(mb_info_t *volatile_bootInfo)
{
    ulong availMem, usedMem;
    
    availMem = get_available_memory(volatile_bootInfo);
    usedMem = get_used_memory(volatile_bootInfo);
    
    printk("OSV v%d.%d (%s)\n", VERSION, REVISION, RELEASE);
    printk("Copyright (C) %s Ciprian Dosoftei <[e-mail]>\n", CYEARS);

#ifdef DEBUG_MESSAGES
    DEBUG("debug messages enabled");
#else
    printk(" %c debug messages disabled", 0xAF);
#endif

    identifyCPU(&boot_cpu_data);
    DEBUG("identifying CPU(s)...");
    displayCPUInfo(&boot_cpu_data);
    
    reprogramPIC(0x20,0x28);
    DEBUG("reprogramming PIC");
    
    setupGDT();
    DEBUG("setting up GDT...");
    
    setupIDT();
    DEBUG("setting up IDT...");
    
    setupExceptions();
    DEBUG("setting up exceptions...");
    
    setupMemory(availMem, usedMem);
    DEBUG("loading memory pre-manager");
    printk(" %c %dMb memory found\n", 0xAF, availMem / 1024 / 1024);
    
    setupPaging(availMem); 
    DEBUG("setting up paging...");
    
    initTimer();
    printk(" %c initializing the timer driver\n", 0xAF);

    waitKey();
    halt();

    return 0;
}