From bd585306e31889ee4fce60abb79bc3b3a58e2b84 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 6 Apr 2026 13:11:15 +0200
Subject: kapi: add basic ACPI support

---
 kapi/include/kapi/acpi.hpp | 64 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 kapi/include/kapi/acpi.hpp

(limited to 'kapi/include')

diff --git a/kapi/include/kapi/acpi.hpp b/kapi/include/kapi/acpi.hpp
new file mode 100644
index 0000000..20e5e77
--- /dev/null
+++ b/kapi/include/kapi/acpi.hpp
@@ -0,0 +1,64 @@
+#ifndef TEACHOS_KAPI_ACPI_HPP
+#define TEACHOS_KAPI_ACPI_HPP
+
+#include "kapi/memory.hpp"
+#include <kstd/units>
+
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <string_view>
+
+namespace kapi::acpi
+{
+
+  //! @addtogroup kapi-acpi-api-defined
+  //! @{
+
+  struct [[gnu::packed]] root_system_description_pointer
+  {
+    [[nodiscard]] auto oem_id() const noexcept -> std::string_view;
+    [[nodiscard]] auto revision() const noexcept -> std::uint8_t;
+    [[nodiscard]] auto signature() const noexcept -> std::string_view;
+    [[nodiscard]] auto table_address() const noexcept -> memory::physical_address;
+    [[nodiscard]] auto validate() const noexcept -> bool;
+
+  private:
+    std::array<char, 8> m_signature;
+    [[maybe_unused]] std::uint8_t m_checksum;
+    std::array<char, 6> m_oem_id;
+    std::uint8_t m_revision;
+    std::array<std::byte, 4> m_rsdt_address;
+  };
+
+  struct [[gnu::packed]] extended_system_description_pointer : root_system_description_pointer
+  {
+    [[nodiscard]] auto length() const noexcept -> kstd::units::bytes;
+    [[nodiscard]] auto table_address() const noexcept -> memory::physical_address;
+    [[nodiscard]] auto validate() const noexcept -> bool;
+
+  private:
+    std::uint32_t m_length;
+    std::array<std::byte, 8> m_xsdt_address;
+    [[maybe_unused]] std::uint8_t m_extended_checksum;
+    [[maybe_unused]] std::array<std::byte, 3> m_reserved;
+  };
+
+  //! @}
+
+  struct [[gnu::packed]] system_description_table_header
+  {
+    std::array<char, 4> signature;
+    std::uint32_t length;
+    std::uint8_t revision;
+    std::uint8_t checksum;
+    std::array<char, 6> oem_id;
+    std::array<char, 8> oem_table_id;
+    std::uint32_t oem_revision;
+    std::uint32_t creator_id;
+    std::uint32_t create_revision;
+  };
+
+}  // namespace kapi::acpi
+
+#endif
-- 
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