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#include "kapi/acpi.hpp"
#include "kapi/memory.hpp"
#include "kapi/system.hpp"
#include "kernel/acpi/manager.hpp"
#include <kstd/units>
#include <algorithm>
#include <atomic>
#include <bit>
#include <cstddef>
#include <cstdint>
#include <optional>
#include <span>
#include <string_view>
namespace kapi::acpi
{
namespace
{
auto constinit manager = std::optional<kernel::acpi::manager>{};
} // namespace
auto root_system_description_pointer::oem_id() const noexcept -> std::string_view
{
return {m_oem_id.data(), m_oem_id.size()};
}
auto root_system_description_pointer::revision() const noexcept -> std::uint8_t
{
return m_revision;
}
auto root_system_description_pointer::signature() const noexcept -> std::string_view
{
return {m_signature.data(), m_signature.size()};
}
auto root_system_description_pointer::table_address() const noexcept -> memory::physical_address
{
auto raw = std::bit_cast<std::uint32_t>(m_rsdt_address);
return memory::physical_address{static_cast<std::uintptr_t>(raw)};
}
auto root_system_description_pointer::validate() const noexcept -> bool
{
return validate_checksum({reinterpret_cast<std::byte const *>(this), sizeof(root_system_description_pointer)});
}
auto extended_system_description_pointer::length() const noexcept -> kstd::units::bytes
{
return kstd::units::bytes{m_length};
}
auto extended_system_description_pointer::table_address() const noexcept -> memory::physical_address
{
return memory::physical_address{std::bit_cast<std::uintptr_t>(m_xsdt_address)};
}
auto extended_system_description_pointer::validate() const noexcept -> bool
{
return validate_checksum({reinterpret_cast<std::byte const *>(this), m_length});
}
auto init(root_system_description_pointer const & sdp) -> bool
{
auto static constinit initialized = std::atomic_flag{};
if (initialized.test_and_set())
{
system::panic("[OS::ACPI] The ACPI manager has already been initialized!");
}
manager.emplace(sdp);
return manager->load_tables();
}
auto validate_checksum(std::span<std::byte const> data) -> bool
{
auto sum = std::ranges::fold_left(data, std::uint8_t{}, [](auto acc, auto byte) {
return static_cast<std::uint8_t>(acc + static_cast<std::uint8_t>(byte));
});
return sum == 0;
}
}; // namespace kapi::acpi
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