// 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();
}
