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#include "types.h"
#include "defs.h"
#include "param.h"
#include "memlayout.h"
#include "mmu.h"
#include "proc.h"
#include "x86.h"
static void bootothers(void);
static void mpmain(void);
void jmpkstack(void) __attribute__((noreturn));
void mainc(void);
static volatile int newpgdir;
// Bootstrap processor starts running C code here.
// Allocate a real stack and switch to it, first
// doing some setup required for memory allocator to work.
int
main(void)
{
pginit(pgalloc);
mpinit(); // collect info about this machine
lapicinit(mpbcpu());
seginit(); // set up segments
kinit(); // initialize memory allocator
jmpkstack(); // call mainc() on a properly-allocated stack
}
void
jmpkstack(void)
{
char *kstack, *top;
kstack = kalloc();
if(kstack == 0)
panic("jmpkstack kalloc");
top = kstack + PGSIZE;
asm volatile("movl %0,%%esp; call mainc" : : "r" (top));
panic("jmpkstack");
}
// Set up hardware and software.
// Runs only on the boostrap processor.
void
mainc(void)
{
cprintf("\ncpu%d: starting xv6\n\n", cpu->id);
picinit(); // interrupt controller
ioapicinit(); // another interrupt controller
consoleinit(); // I/O devices & their interrupts
uartinit(); // serial port
pinit(); // process table
tvinit(); // trap vectors
binit(); // buffer cache
fileinit(); // file table
iinit(); // inode cache
ideinit(); // disk
if(!ismp)
timerinit(); // uniprocessor timer
userinit(); // first user process
bootothers(); // start other processors
kvmalloc(); // new kernel page table wo. bottom mapped
newpgdir = 1;
// Finish setting up this processor in mpmain.
mpmain();
}
// Common CPU setup code.
// Bootstrap CPU comes here from mainc().
// Other CPUs jump here from bootother.S.
static void
mpboot(void)
{
vmenable(); // turn on paging
seginit();
lapicinit(cpunum());
mpmain();
}
// Common CPU setup code.
// Bootstrap CPU comes here from mainc().
// Other CPUs jump here from bootother.S.
static void
mpmain(void)
{
cprintf("cpu%d: starting\n", cpu->id);
idtinit(); // load idt register
xchg(&cpu->booted, 1); // tell bootothers() we're up
while (!newpgdir) ; // wait until we have new page dir
switchkvm(); // switch to new page dir
scheduler(); // start running processes
}
// Start the non-boot processors.
static void
bootothers(void)
{
extern uchar _binary_bootother_start[], _binary_bootother_size[];
uchar *code;
struct cpu *c;
char *stack;
// Write bootstrap code to unused memory at 0x7000.
// The linker has placed the image of bootother.S in
// _binary_bootother_start.
code = p2v(0x7000);
memmove(code, _binary_bootother_start, (uint)_binary_bootother_size);
for(c = cpus; c < cpus+ncpu; c++){
if(c == cpus+cpunum()) // We've started already.
continue;
// Tell bootother.S what stack to use and the address of mpmain;
// it expects to find these two addresses stored just before
// its first instruction.
stack = kalloc();
*(void**)(code-4) = stack + KSTACKSIZE;
*(void**)(code-8) = mpboot;
lapicstartap(c->id, v2p(code));
// Wait for cpu to finish mpmain()
while(c->booted == 0)
;
}
}
//PAGEBREAK!
// Blank page.
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