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#include "kernel/acpi/manager.hpp"
#include "kapi/memory.hpp"
#include "kapi/system.hpp"
#include <kstd/memory>
#include <kstd/print>
#include <acpi/acpi.hpp>
#include <cstddef>
#include <cstdint>
#include <string_view>
namespace kernel::acpi
{
manager::manager(::acpi::rsdp const & sdp)
: m_sdp{&sdp}
{
if (m_sdp->signature() != "RSD PTR ")
{
kapi::system::panic("[OS:ACPI] Invalid RSDP signature!");
}
if (m_sdp->revision() >= 2)
{
auto const xsdp = static_cast<::acpi::xsdp const *>(m_sdp);
if (!xsdp->validate())
{
kapi::system::panic("[OS:ACPI] Invalid XSDP signature!");
}
auto physical_extended_table_address = kapi::memory::physical_address{xsdp->table_address()};
auto linear_extended_table_address = kapi::memory::hhdm_to_linear(physical_extended_table_address);
m_rsdt = static_cast<::acpi::sdt const *>(linear_extended_table_address);
m_extended = true;
}
else
{
if (!m_sdp->validate())
{
kapi::system::panic("[OS:ACPI] Invalid RSDP checksum!");
}
auto physical_root_table_address = kapi::memory::physical_address{m_sdp->table_address()};
auto linear_root_table_address = kapi::memory::hhdm_to_linear(physical_root_table_address);
m_rsdt = static_cast<::acpi::sdt const *>(linear_root_table_address);
}
}
auto manager::load_tables() -> bool
{
if (!::acpi::validate_checksum({reinterpret_cast<std::byte const *>(m_rsdt), m_rsdt->length().value}))
{
kapi::system::panic("[OS:ACPI] Invalid RSDT checksum!");
}
auto entry_size = m_extended ? sizeof(std::uint64_t) : sizeof(std::uint32_t);
auto entry_count = (m_rsdt->length().value - sizeof(::acpi::sdt)) / entry_size;
auto entries_base = reinterpret_cast<std::byte const *>(m_rsdt) + sizeof(::acpi::sdt);
for (std::size_t i = 0; i < entry_count; ++i)
{
auto physical_table_address = kapi::memory::physical_address{};
if (m_extended)
{
auto entry = reinterpret_cast<std::uint64_t const *>(entries_base + (i * entry_size));
physical_table_address = kapi::memory::physical_address{*entry};
}
else
{
auto entry = reinterpret_cast<std::uint32_t const *>(entries_base + (i * entry_size));
physical_table_address = kapi::memory::physical_address{*entry};
}
auto linear_table_address = kapi::memory::hhdm_to_linear(physical_table_address);
auto table = static_cast<::acpi::sdt const *>(linear_table_address);
if (!::acpi::validate_checksum({reinterpret_cast<std::byte const *>(table), table->length().value}))
{
kstd::println(kstd::print_sink::stderr, "[OS:ACPI] Invalid table checksum!");
}
else
{
kstd::println("[OS:ACPI] Found '{}' ACPI table", table->signature());
m_tables.emplace(table->signature(), table);
}
}
return !m_tables.empty();
}
auto manager::get_table(std::string_view signature) -> kstd::observer_ptr<::acpi::sdt const>
{
if (m_tables.contains(signature))
{
return kstd::make_observer(m_tables.at(signature));
}
return nullptr;
}
} // namespace kernel::acpi
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