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Kernel: Make Processor::id a static function

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This eliminates the window between calling Processor::current and
the member function where a thread could be moved to another
processor. This is generally not as big of a concern as with
Processor::current_thread, but also slightly more light weight.
This commit is contained in:
Tom 2021-01-26 20:44:01 -07:00 • committed by Andreas Kling
parent 21d288a10e
commit e2f9e557d3
7 changed files with 48 additions and 38 deletions
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16
Kernel/Arch/i386/CPU.cpp
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@ -174,7 +174,7 @@ void handle_crash(RegisterState& regs, const char* description, int signal, bool
// make sure we switch back to the right page tables.
MM.enter_process_paging_scope(*process);
klog() << "CRASH: CPU #" << Processor::current().id() << " " << description << ". Ring " << (regs.cs & 3) << ".";
klog() << "CRASH: CPU #" << Processor::id() << " " << description << ". Ring " << (regs.cs & 3) << ".";
dump(regs);
if (!(regs.cs & 3)) {
@ -232,7 +232,7 @@ void page_fault_handler(TrapFrame* trap)
if constexpr (PAGE_FAULT_DEBUG) {
u32 fault_page_directory = read_cr3();
dbgln("CPU #{} ring {} {} page fault in PD={:#x}, {}{} {}",
Processor::is_initialized() ? Processor::current().id() : 0,
Processor::is_initialized() ? Processor::id() : 0,
regs.cs & 3,
regs.exception_code & 1 ? "PV" : "NP",
fault_page_directory,
@ -1207,7 +1207,7 @@ Vector<FlatPtr> Processor::capture_stack_trace(Thread& thread, size_t max_frames
lock.unlock();
capture_current_thread();
} else if (thread.is_active()) {
ASSERT(thread.cpu() != Processor::current().id());
ASSERT(thread.cpu() != Processor::id());
// If this is the case, the thread is currently running
// on another processor. We can't trust the kernel stack as
// it may be changing at any time. We need to probably send
@ -1216,7 +1216,7 @@ Vector<FlatPtr> Processor::capture_stack_trace(Thread& thread, size_t max_frames
auto& proc = Processor::current();
smp_unicast(thread.cpu(),
[&]() {
dbgln("CPU[{}] getting stack for cpu #{}", Processor::current().id(), proc.id());
dbgln("CPU[{}] getting stack for cpu #{}", Processor::id(), proc.get_id());
ProcessPagingScope paging_scope(thread.process());
ASSERT(&Processor::current() != &proc);
ASSERT(&thread == Processor::current_thread());
@ -1294,7 +1294,7 @@ extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread)
if (from_tss.cr3 != to_tss.cr3)
write_cr3(to_tss.cr3);
to_thread->set_cpu(processor.id());
to_thread->set_cpu(processor.get_id());
processor.restore_in_critical(to_thread->saved_critical());
asm volatile("fxrstor %0"
@ -1862,7 +1862,7 @@ void Processor::smp_broadcast_message(ProcessorMessage& msg)
{
auto& cur_proc = Processor::current();
dbgln<SMP_DEBUG>("SMP[{}]: Broadcast message {} to cpus: {} proc: {}", cur_proc.id(), VirtualAddress(&msg), count(), VirtualAddress(&cur_proc));
dbgln<SMP_DEBUG>("SMP[{}]: Broadcast message {} to cpus: {} proc: {}", cur_proc.get_id(), VirtualAddress(&msg), count(), VirtualAddress(&cur_proc));
atomic_store(&msg.refs, count() - 1, AK::MemoryOrder::memory_order_release);
ASSERT(msg.refs > 0);
@ -1927,11 +1927,11 @@ void Processor::smp_broadcast(void (*callback)(), bool async)
void Processor::smp_unicast_message(u32 cpu, ProcessorMessage& msg, bool async)
{
auto& cur_proc = Processor::current();
ASSERT(cpu != cur_proc.id());
ASSERT(cpu != cur_proc.get_id());
auto& target_proc = processors()[cpu];
msg.async = async;
dbgln<SMP_DEBUG>("SMP[{}]: Send message {} to cpu #{} proc: {}", cur_proc.id(), VirtualAddress(&msg), cpu, VirtualAddress(&target_proc));
dbgln<SMP_DEBUG>("SMP[{}]: Send message {} to cpu #{} proc: {}", cur_proc.get_id(), VirtualAddress(&msg), cpu, VirtualAddress(&target_proc));
atomic_store(&msg.refs, 1u, AK::MemoryOrder::memory_order_release);
if (target_proc->smp_queue_message(msg)) {