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Kernel: Add Processor::is_bootstrap_processor() function, and use it. (#6871)

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The variety of checks for Processor::id() == 0 could use some assistance
in the readability department. This change adds a new function to
represent this check, and replaces the comparison everywhere it's used.
This commit is contained in:
Brian Gianforcaro 2021-05-05 16:48:26 +00:00 committed by GitHub
parent 72a61fe137
commit 64b4e3f34b
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GPG Key ID: 4AEE18F83AFDEB23
Notes: sideshowbarker 2024-07-18 18:41:26 +09:00 
Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/64b4e3f34b1
Pull-request: https://github.com/SerenityOS/serenity/pull/6871
4 changed files with 10 additions and 6 deletions
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5
Kernel/Arch/x86/CPU.h
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@ -823,6 +823,11 @@ public:
return read_fs_ptr(__builtin_offsetof(Processor, m_cpu));
}
ALWAYS_INLINE static bool is_bootstrap_processor()
{
return Processor::id() == 0;
}
ALWAYS_INLINE u32 raise_irq()
{
return m_in_irq++;

2
Kernel/Interrupts/APIC.cpp
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@ -485,7 +485,7 @@ UNMAP_AFTER_INIT APICTimer* APIC::initialize_timers(HardwareTimerBase& calibrati
return nullptr;
// We should only initialize and calibrate the APIC timer once on the BSP!
VERIFY(Processor::id() == 0);
VERIFY(Processor::is_bootstrap_processor());
VERIFY(!m_apic_timer);
m_apic_timer = APICTimer::initialize(IRQ_APIC_TIMER, calibration_timer);

5
Kernel/Scheduler.cpp
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@ -475,7 +475,7 @@ UNMAP_AFTER_INIT Thread* Scheduler::create_ap_idle_thread(u32 cpu)
{
VERIFY(cpu != 0);
// This function is called on the bsp, but creates an idle thread for another AP
VERIFY(Processor::id() == 0);
VERIFY(Processor::is_bootstrap_processor());
VERIFY(s_colonel_process);
Thread* idle_thread = s_colonel_process->create_kernel_thread(idle_loop, nullptr, THREAD_PRIORITY_MIN, String::formatted("idle thread #{}", cpu), 1 << cpu, false);
@ -497,8 +497,7 @@ void Scheduler::timer_tick(const RegisterState& regs)
VERIFY(current_thread->current_trap()->regs == &regs);
#if !SCHEDULE_ON_ALL_PROCESSORS
bool is_bsp = Processor::id() == 0;
if (!is_bsp)
if (!Processor::is_bootstrap_processor())
return; // TODO: This prevents scheduling on other CPUs!
#endif

4
Kernel/Time/TimeManagement.cpp
View File

@ -153,7 +153,7 @@ UNMAP_AFTER_INIT void TimeManagement::initialize(u32 cpu)
void TimeManagement::set_system_timer(HardwareTimerBase& timer)
{
VERIFY(Processor::id() == 0); // This should only be called on the BSP!
VERIFY(Processor::is_bootstrap_processor()); // This should only be called on the BSP!
auto original_callback = m_system_timer->set_callback(nullptr);
m_system_timer->disable();
timer.set_callback(move(original_callback));
@ -269,7 +269,7 @@ UNMAP_AFTER_INIT bool TimeManagement::probe_and_set_non_legacy_hardware_timers()
// Update the time. We don't really care too much about the
// frequency of the interrupt because we'll query the main
// counter to get an accurate time.
if (Processor::id() == 0) {
if (Processor::is_bootstrap_processor()) {
// TODO: Have the other CPUs call system_timer_tick directly
increment_time_since_boot_hpet();
}