x86_64/cpu: fixup 8259 interrupt handling

We now mask the timer interrupt and ensure we are informing the PIC
about us having handled the interrupt.

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/x86_64/include/arch/cpu/legacy_pic.hpp b/arch/x86_64/include/arch/cpu/legacy_pic.hpp
new file mode 100644
index 0000000..9f53d86
--- /dev/null
+++ b/arch/x86_64/include/arch/cpu/legacy_pic.hpp
@@ -0,0 +1,19 @@
+#ifndef TEACHOS_X86_64_CPU_LEGACY_PIC_HPP
+#define TEACHOS_X86_64_CPU_LEGACY_PIC_HPP
+
+#include "arch/device_io/port_io.hpp"
+
+#include <cstdint>
+
+namespace arch::cpu
+{
+  using pic_master_control_port = io::port<0x20, std::uint8_t, io::port_read, io::port_write>;
+  using pic_master_data_port = io::port<0x21, std::uint8_t, io::port_read, io::port_write>;
+  using pic_slave_control_port = io::port<0xa0, std::uint8_t, io::port_read, io::port_write>;
+  using pic_slave_data_port = io::port<0xa1, std::uint8_t, io::port_read, io::port_write>;
+
+  constexpr auto pic_end_of_interrupt = std::uint8_t{0x20};
+
+}  // namespace arch::cpu
+
+#endif
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