RTCCUINTREG VBOXCALL supdrvOSChangeCR4(RTCCUINTREG fOrMask, RTCCUINTREG fAndMask)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 20, 0)
RTCCUINTREG uOld = this_cpu_read(cpu_tlbstate.cr4);
RTCCUINTREG uNew = (uOld & fAndMask) | fOrMask;
if (uNew != uOld)
{
this_cpu_write(cpu_tlbstate.cr4, uNew);
__write_cr4(uNew);
}
#else
RTCCUINTREG uOld = ASMGetCR4();
RTCCUINTREG uNew = (uOld & fAndMask) | fOrMask;
if (uNew != uOld)
ASMSetCR4(uNew);
#endif
return uOld;
}
/*
* Activate a secondary processor.
*/
static void notrace start_secondary(void *unused)
{
/*
* Don't put *anything* except direct CPU state initialization
* before cpu_init(), SMP booting is too fragile that we want to
* limit the things done here to the most necessary things.
*/
if (boot_cpu_has(X86_FEATURE_PCID))
__write_cr4(__read_cr4() | X86_CR4_PCIDE);
#ifdef CONFIG_X86_32
/* switch away from the initial page table */
load_cr3(swapper_pg_dir);
/*
* Initialize the CR4 shadow before doing anything that could
* try to read it.
*/
cr4_init_shadow();
__flush_tlb_all();
#endif
load_current_idt();
cpu_init();
x86_cpuinit.early_percpu_clock_init();
preempt_disable();
smp_callin();
enable_start_cpu0 = 0;
/* otherwise gcc will move up smp_processor_id before the cpu_init */
barrier();
/*
* Check TSC synchronization with the boot CPU:
*/
check_tsc_sync_target();
speculative_store_bypass_ht_init();
/*
* Lock vector_lock, set CPU online and bring the vector
* allocator online. Online must be set with vector_lock held
* to prevent a concurrent irq setup/teardown from seeing a
* half valid vector space.
*/
lock_vector_lock();
set_cpu_online(smp_processor_id(), true);
lapic_online();
unlock_vector_lock();
cpu_set_state_online(smp_processor_id());
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_AP_ONLINE_IDLE);
}
