2. Booting课件.pptVIP

Booting;System Lifecycle: Ups Downs;What’s loader;Who Loads the Loader?;必绢蝗童滴甸玩身关怠窟蝉牲虏歉琢檀靛项赘无撑晾狠盂蚌盛遗潘方衷启2. Booting课件2. Booting课件;PROM Monitors vs. BIOS;the Linux boot process on PC ;Boot sequence on standard PC (IBM-PC compatible);Anatomy of the MBR ;MBR is small, most boot loaders load in two stages. first stage : the BIOS loads a part of the boot loader known as the initial program loader, or IPL. The IPL interrogates the partition table and subsequently is able to load data wherever it may exist on the various media. This action is used initially to locate the second stage boot loader and load it. The second stage boot loader is the real meat of the boot loader.;Boot loaders are usually configured in one of two ways: As a primary boot loader: Primary boot loaders are where the first stage of the boot loader is installed on the MBR (per the previous description). As a secondary boot loader Secondary boot loaders are where the first stage of the boot loader is installed onto a bootable partition. A separate boot loader must then be installed into the MBR and configured to pass control to the secondary boot loader. ;LILO: LInux LOader;LILO Components;Example lilo.conf File;Booting from Disk with LILO;GRUB;GRUB boot process;Example grub.conf file ;Kernel Options;Kernel Booting;start_kernel( ) Function The scheduler is initialized by invoking the sched_init( ) function The memory zones are initialized by invoking the build_all_zonelists( ) The Buddy system allocators are initialized by invoking the page_alloc_init( ) and mem_init( ) invoking trap_init( ) : final initialization of the IDT. The TASKLET_SOFTIRQ and HI_SOFTIRQ are initialized by invoking the softirq_init( ) function. The system date and time are initialized by the time_init( ) function The slab allocator is initialized by the kmem_cache_init( ) function . The speed of the CPU clock is determined by invoking the calibrate_delay( ) function The kernel thread for process 1 is created by invoking t