1a81e38b17
Variable declarations at top of function,
separate from initialization.
Use == 0 instead of ! for checking pointers.
Consistent spacing around {, *, casts.
Declare 0-parameter functions as (void) not ().
Integer valued functions return -1 on failure, 0 on success.
114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
#include "types.h"
|
|
#include "defs.h"
|
|
#include "param.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);
|
|
|
|
// 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)
|
|
{
|
|
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
|
|
kvmalloc(); // initialize the kernel page table
|
|
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
|
|
|
|
// 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
|
|
mpmain(void)
|
|
{
|
|
if(cpunum() != mpbcpu()){
|
|
seginit();
|
|
lapicinit(cpunum());
|
|
}
|
|
vmenable(); // turn on paging
|
|
cprintf("cpu%d: starting\n", cpu->id);
|
|
idtinit(); // load idt register
|
|
xchg(&cpu->booted, 1); // tell bootothers() we're up
|
|
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 = (uchar*)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) = mpmain;
|
|
|
|
lapicstartap(c->id, (uint)code);
|
|
|
|
// Wait for cpu to finish mpmain()
|
|
while(c->booted == 0)
|
|
;
|
|
}
|
|
}
|