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Kernel: All processors use LAPIC timer when running with APIC

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This makes scheduler preemption much cleaner as bsb does not have to
send smp messages to notify other processes about timer interrupt.

Also PIT percision is now "full" 0.8 us instead of 1 ms that I was using
before.
This commit is contained in:
Bananymous
2024-07-23 02:28:52 +03:00
parent 3e0150f847
commit 539afb329a
17 changed files with 224 additions and 73 deletions
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14
kernel/kernel/Processor.cpp
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@@ -20,7 +20,7 @@ namespace Kernel
static BAN::Atomic<uint8_t> s_processors_created { 0 };
// 32 bit milli seconds are definitely enough as APs start on boot
static BAN::Atomic<uint32_t> s_first_ap_ready_ms { 0 };
static BAN::Atomic<uint32_t> s_first_ap_ready_ms { static_cast<uint32_t>(-1) };
static BAN::Array<Processor, 0xFF> s_processors;
static BAN::Array<ProcessorID, 0xFF> s_processor_ids { PROCESSOR_NONE };
@@ -130,7 +130,7 @@ namespace Kernel
// wait until first AP is ready
const uint64_t timeout_ms = SystemTimer::get().ms_since_boot() + 1000;
while (s_first_ap_ready_ms == 0)
while (s_first_ap_ready_ms == static_cast<uint32_t>(-1))
{
if (SystemTimer::get().ms_since_boot() >= timeout_ms)
{
@@ -150,7 +150,7 @@ namespace Kernel
ASSERT(s_processor_ids[lookup_index] == PROCESSOR_NONE);
s_processor_ids[lookup_index] = current_id();
uint32_t expected = 0;
uint32_t expected = static_cast<uint32_t>(-1);
s_first_ap_ready_ms.compare_exchange(expected, SystemTimer::get().ms_since_boot());
}
@@ -209,8 +209,6 @@ namespace Kernel
}
);
bool should_preempt = false;
if (pending)
{
// reverse smp message queue from LIFO to FIFO
@@ -245,9 +243,6 @@ namespace Kernel
case SMPMessage::Type::UnblockThread:
processor.m_scheduler->handle_unblock_request(message->unblock_thread);
break;
case SMPMessage::Type::SchedulerPreemption:
should_preempt = true;
break;
}
last_handled = message;
@@ -262,9 +257,6 @@ namespace Kernel
);
}
if (should_preempt)
processor.m_scheduler->preempt();
set_interrupt_state(state);
}