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#include "kapi/cpu.hpp"
#include "kapi/acpi.hpp"
#include "kapi/devices.hpp"
#include "kapi/devices/cpu.hpp"
#include "kapi/system.hpp"
#include "arch/cpu/initialization.hpp"
#include "arch/devices/local_apic.hpp"
#include <kstd/memory>
#include <kstd/print>
#include <atomic>
#include <ranges>
#include <utility>
namespace kapi::cpu
{
namespace
{
constexpr auto candidate_flags = acpi::processor_local_apic::flags::processor_enabled //
| acpi::processor_local_apic::flags::online_capable;
}
auto init() -> void
{
auto static constinit is_initialized = std::atomic_flag{};
if (is_initialized.test_and_set())
{
system::panic("[x86_64] CPU has already been initialized.");
}
arch::cpu::initialize_descriptors();
arch::cpu::initialize_legacy_interrupts();
}
auto halt() -> void
{
asm volatile("1: hlt\njmp 1b");
__builtin_unreachable();
}
auto discover_topology() -> bool
{
auto static const cpu_major = kapi::devices::allocate_major_number();
auto static const core_major = kapi::devices::allocate_major_number();
auto static const interrupt_controller_major = kapi::devices::allocate_major_number();
auto madt = kapi::acpi::get_table<acpi::madt_table_signature>();
if (!madt)
{
kstd::println("[x86_64:PLT] Failed to find ACPI APIC table");
return false;
}
auto lapic_entries = *madt | std::views::filter([](auto const & entry) {
return entry.type() == acpi::multiple_apic_description_table_entry::types::processor_local_apic;
}) | std::views::transform([](auto const & entry) {
return static_cast<acpi::processor_local_apic const &>(entry);
}) | std::views::filter([](auto const & entry) {
return static_cast<bool>(entry.active_flags() & candidate_flags);
});
auto bsp_found = false;
auto core_count = 0uz;
auto local_apic_address = madt->local_interrupt_controller_address();
auto cpu_bus = kstd::make_unique<devices::cpu>(cpu_major, 0);
for (auto const & apic : lapic_entries)
{
auto is_bsp = !bsp_found;
bsp_found = true;
auto core = kstd::make_unique<devices::cpu::core>(core_major, core_count, apic.processor_id(), is_bsp);
core->add_child(kstd::make_unique<arch::devices::local_apic>(interrupt_controller_major, core_count,
apic.apic_id(), local_apic_address, is_bsp));
cpu_bus->add_child(std::move(core));
++core_count;
}
devices::get_root_bus().add_child(std::move(cpu_bus));
kstd::println("[x86_64:PLT] Found {} CPU cores", core_count);
return core_count > 0;
}
} // namespace kapi::cpu
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