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#include "arch/devices/local_apic.hpp"
#include "kapi/devices.hpp"
#include "kapi/memory.hpp"
#include <kstd/print>
#include <cstddef>
#include <cstdint>
#include <utility>
namespace arch::devices
{
namespace
{
constexpr auto lapic_enable_bit = 0x100u;
constexpr auto spurious_interrupt_vector = 0xFFu;
constexpr auto offset_of_version = 0u;
constexpr auto offset_of_max_lvt_entry = 16u;
constexpr auto offset_of_eoi_suppression = 24u;
} // namespace
enum struct local_apic::registers : std::ptrdiff_t
{
id = 0x020,
version = 0x030,
task_priority = 0x080,
arbitration_priority = 0x090,
processor_priority = 0x0a0,
eoi = 0x0b0,
remote_read = 0x0c0,
logical_destination = 0x0d0,
destination_format = 0x0e0,
spurious_interrupt_vector = 0x0f0,
in_service_0 = 0x100,
in_service_1 = 0x110,
in_service_2 = 0x120,
in_service_3 = 0x130,
in_service_4 = 0x140,
in_service_5 = 0x150,
in_service_6 = 0x160,
in_service_7 = 0x170,
trigger_mode_0 = 0x180,
trigger_mode_1 = 0x190,
trigger_mode_2 = 0x1a0,
trigger_mode_3 = 0x1b0,
trigger_mode_4 = 0x1c0,
trigger_mode_5 = 0x1d0,
trigger_mode_6 = 0x1e0,
trigger_mode_7 = 0x1f0,
interrupt_request_0 = 0x200,
interrupt_request_1 = 0x210,
interrupt_request_2 = 0x220,
interrupt_request_3 = 0x230,
interrupt_request_4 = 0x240,
interrupt_request_5 = 0x250,
interrupt_request_6 = 0x260,
interrupt_request_7 = 0x270,
error_status = 0x280,
lvt_corrected_machine_check_interrupt = 0x2f0,
interrupt_command_0 = 0x300,
interrupt_command_1 = 0x310,
lvt_timer = 0x320,
lvt_thermal_sensors = 0x330,
lvt_performance_monitoring_counters = 0x340,
lvt_local_interrupt_0 = 0x350,
lvt_local_interrupt_1 = 0x360,
lvt_error = 0x370,
initial_count = 0x380,
current_count = 0x390,
divide_configuration = 0x3e0,
};
local_apic::local_apic(std::size_t major, std::size_t minor, std::uint64_t hardware_id,
kapi::memory::physical_address base, bool is_bsp)
: kapi::devices::device{major, minor, "lapic"}
, m_hardware_id{hardware_id}
, m_base{base}
, m_is_bsp{is_bsp}
{}
auto local_apic::init() -> bool
{
auto static shared_virtual_base = kapi::memory::allocate_mmio_region(1);
auto static is_mapped = false;
if (!is_mapped)
{
if (!kapi::memory::map_mmio_region(shared_virtual_base, m_base, kapi::memory::page_mapper::flags::writable))
{
kstd::println("[x86_64:DEV] LAPIC {} MMIO mapping failed!", m_hardware_id);
return false;
}
is_mapped = true;
}
m_virtual_base = shared_virtual_base;
if (m_is_bsp)
{
auto raw_version = read_register(registers::version);
m_version = (raw_version >> offset_of_version) & 0xff;
m_highest_lvt_entry_index = (raw_version >> offset_of_max_lvt_entry) & 0xff;
m_supports_eoi_broadcast_suppression = (raw_version >> offset_of_eoi_suppression) & 0x1;
write_register(registers::spurious_interrupt_vector, lapic_enable_bit | spurious_interrupt_vector);
kstd::println("[x86_64:DEV] LAPIC initialized. version: {#x} | max_lvt_entry: {} | eoi_suppresion: {:s}",
m_version, m_highest_lvt_entry_index, m_supports_eoi_broadcast_suppression);
}
else
{
kstd::println("[x86_64:DEV] LAPIC {} is not on the BSP, deferring intialization.", m_hardware_id);
}
return true;
}
auto local_apic::read_register(registers id) const -> std::uint32_t
{
auto reg = static_cast<std::uint32_t volatile *>(m_virtual_base + std::to_underlying(id));
return *reg;
}
auto local_apic::write_register(registers id, std::uint32_t value) -> void
{
auto reg = static_cast<std::uint32_t volatile *>(m_virtual_base + std::to_underlying(id));
*reg = value;
}
} // namespace arch::devices
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