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#include "kapi/cpu.hpp"
#include "kapi/system.hpp"
#include "arch/cpu/initialization.hpp"
#include <kstd/print>
#include <kstd/vector>
#include <array>
#include <atomic>
#include <cstdint>
namespace kapi::cpu
{
namespace
{
constexpr auto irq_offset = 32uz;
auto constinit interrupt_handlers = std::array<kstd::vector<interrupt_handler *>, 256 - irq_offset>{};
} // namespace
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 enable_interrupts() -> void
{
asm volatile("sti");
}
auto disable_interrupts() -> void
{
asm volatile("cli");
}
auto register_interrupt_handler(std::uint32_t irq_number, interrupt_handler & handler) -> void
{
if (irq_number < irq_offset)
{
system::panic("[x86_64:CPU] IRQ number must be in range [32, 255].");
}
interrupt_handlers[irq_number - irq_offset].push_back(&handler);
}
auto unregister_interrupt_handler(std::uint32_t irq_number, [[maybe_unused]] interrupt_handler & handler) -> void
{
if (irq_number < irq_offset)
{
system::panic("[x86_64:CPU] IRQ number must be in range [32, 255].");
}
kstd::println("[x86_64:CPU] TODO: support erasure from vector.");
}
auto dispatch_interrupt(std::uint32_t irq_number) -> status
{
if (irq_number < irq_offset)
{
return status::unhandled;
}
for (auto handler : interrupt_handlers[irq_number - irq_offset])
{
if (handler && handler->handle_interrupt(irq_number) == status::handled)
{
return status::handled;
}
}
return status::unhandled;
}
} // namespace kapi::cpu
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