// Bootstrap processor starts running C code here. int main(int memsize) { mpinit(); // collect info about this machine lapicinit(mpbcpu()); ksegment(); picinit(); // interrupt controller ioapicinit(); // another interrupt controller consoleinit(); // I/O devices & their interrupts uartinit(); // serial port cprintf("cpus %p cpu %p\n", cpus, cpu); cprintf("\ncpu%d: starting xv6\n\n", cpu->id); cprintf("mem: %d kb\n", memsize); kinit(memsize); // physical memory allocator pinit(); // process table tvinit(); // trap vectors binit(); // buffer cache fileinit(); // file table iinit(); // inode cache ideinit(); // disk if(!ismp) timerinit(); // uniprocessor timer pageinit(); // enable paging userinit(); // first user process bootothers(); // start other processors // Finish setting up this processor in mpmain. mpmain(); }
/** * Bootstrap processor starts running C code here. */ int main(void) { /** * ld会生成如下几个变量用来标识程序的段 * * _etext(etext) 正文段结束后第一个地址 * _edata(edata) 数据段结束后第一个地址 * _end(end) bss段结束后第一个地址 */ extern char edata[], end[]; // clear BSS memset(edata, 0, end - edata); // collect info about this machine mp_init(); lapic_init(mp_bcpu()); cprintf("\ncpu%d: starting myos\n\n", cpu()); cprintf("Welcome to myos !\n"); pinit(); // process table binit(); // buffer cache pic_init(); // interrupt controller ioapic_init(); // another interrupt controller kinit(); // physical memory allocator tvinit(); // trap vectors fileinit(); // file table iinit(); // inode cache console_init(); // I/O devices & their interrupts ide_init(); // disk if(!ismp) timer_init(); // uniprocessor timer userinit(); // first user process bootothers(); // start other processors // Finish setting up this processor in mpmain. mpmain(); }