/*
* Activate a secondary processor.
*/
notrace static void __cpuinit start_secondary(void *unused)
{
/*
* Don't put *anything* before cpu_init(), SMP booting is too
* fragile that we want to limit the things done here to the
* most necessary things.
*/
cpu_init();
x86_cpuinit.early_percpu_clock_init();
preempt_disable();
smp_callin();
enable_start_cpu0 = 0;
#ifdef CONFIG_X86_32
/* switch away from the initial page table */
load_cr3(swapper_pg_dir);
__flush_tlb_all();
#endif
/* otherwise gcc will move up smp_processor_id before the cpu_init */
barrier();
/*
* Check TSC synchronization with the BP:
*/
check_tsc_sync_target();
/*
* Enable the espfix hack for this CPU
*/
#ifdef CONFIG_X86_ESPFIX64
init_espfix_ap();
#endif
/*
* We need to hold vector_lock so there the set of online cpus
* does not change while we are assigning vectors to cpus. Holding
* this lock ensures we don't half assign or remove an irq from a cpu.
*/
lock_vector_lock();
set_cpu_online(smp_processor_id(), true);
unlock_vector_lock();
per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
x86_platform.nmi_init();
/* enable local interrupts */
local_irq_enable();
/* to prevent fake stack check failure in clock setup */
boot_init_stack_canary();
x86_cpuinit.setup_percpu_clockev();
wmb();
cpu_startup_entry(CPUHP_ONLINE);
}
void __init init_espfix_bsp(void)
{
pgd_t *pgd_p;
pteval_t ptemask;
ptemask = __supported_pte_mask;
/* Install the espfix pud into the kernel page directory */
pgd_p = &init_level4_pgt[pgd_index(ESPFIX_BASE_ADDR)];
pgd_populate(&init_mm, pgd_p, (pud_t *)espfix_pud_page);
/* Randomize the locations */
init_espfix_random();
/* The rest is the same as for any other processor */
init_espfix_ap();
}
void __init init_espfix_bsp(void)
{
pgd_t *pgd_p;
pud_t *pud_p;
unsigned long index = pgd_index(ESPFIX_BASE_ADDR);
/* Install the espfix pud into the kernel page directory */
pgd_p = &init_level4_pgt[index];
pud_p = espfix_pud_page;
paravirt_alloc_pud(&init_mm, __pa(pud_p) >> PAGE_SHIFT);
set_pgd(pgd_p, __pgd(PGTABLE_PROT | __pa(pud_p)));
#ifdef CONFIG_PAX_PER_CPU_PGD
clone_pgd_range(get_cpu_pgd(0, kernel) + index, swapper_pg_dir + index, 1);
clone_pgd_range(get_cpu_pgd(0, user) + index, swapper_pg_dir + index, 1);
#endif
/* Randomize the locations */
init_espfix_random();
/* The rest is the same as for any other processor */
init_espfix_ap(0);
}
