Linux 0.11内核main函数

最新推荐文章于 2022-06-01 14:52:22 发布

tosoth

最新推荐文章于 2022-06-01 14:52:22 发布

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文章标签： linux buffer exception signal user ext

本文链接：https://blog.youkuaiyun.com/tosoth/article/details/3299892

本文详细介绍了Linux0.11内核的main函数实现过程，包括内存初始化、设备驱动初始化、中断使能等关键步骤。通过具体代码展示了早期Linux内核的启动流程。

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Linux 0.11内核main函数

void main(void)     /* This really IS void, no error here. */
{           /* The startup routine assumes (well, ...) this */
/*
* Interrupts are still disabled. Do necessary setups, then
* enable them
*/
    ROOT_DEV = ORIG_ROOT_DEV;
    drive_info = DRIVE_INFO;
    memory_end = (1<<20) + (EXT_MEM_K<<10);
    memory_end &= 0xfffff000;
    if (memory_end > 16*1024*1024)
        memory_end = 16*1024*1024;
    if (memory_end > 12*1024*1024)
        buffer_memory_end = 4*1024*1024;
    else if (memory_end > 6*1024*1024)
        buffer_memory_end = 2*1024*1024;
    else
        buffer_memory_end = 1*1024*1024;
    main_memory_start = buffer_memory_end;
#ifdef RAMDISK
    main_memory_start += rd_init(main_memory_start, RAMDISK*1024);
#endif
    mem_init(main_memory_start,memory_end);
    trap_init();
    blk_dev_init();
    chr_dev_init();
    tty_init();
    time_init();
    sched_init();
    buffer_init(buffer_memory_end);
    hd_init();
    floppy_init();
    sti();
    move_to_user_mode();
    if (!fork()) {      /* we count on this going ok */
        init();
    }
/*
*   NOTE!!   For any other task 'pause()' would mean we have to get a
* signal to awaken, but task0 is the sole exception (see 'schedule()')
* as task 0 gets activated at every idle moment (when no other tasks
* can run). For task0 'pause()' just means we go check if some other
* task can run, and if not we return here.
*/
    for(;;) pause();
}