5 files changed, 81 insertions, 7 deletions
diff --git a/libs/kstd/include/kstd/flat_map b/libs/kstd/include/kstd/flat_map
index 6ffbbcf..3b13754 100644
--- a/libs/kstd/include/kstd/flat_map
+++ b/libs/kstd/include/kstd/flat_map
@@ -205,6 +205,24 @@ namespace kstd
       return const_reverse_iterator{cbegin()};
     }
 
+    //! Check whether this flat map is empty or not
+    [[nodiscard]] auto empty() const noexcept -> bool
+    {
+      return m_containers.keys.empty();
+    }
+
+    //! Get the number of elements in this flat map.
+    [[nodiscard]] auto size() const noexcept -> size_type
+    {
+      return m_containers.keys.size();
+    }
+
+    //! Get the maximum number of elements possible in this flat map
+    [[nodiscard]] auto max_size() const noexcept -> size_type
+    {
+      return std::min(m_containers.keys.max_size(), m_containers.values.max_size());
+    }
+
     //! Try to insert a new key-value pair into the map.
     //!
     //! @param args Arguments to use for constructing the key-value pair.
diff --git a/libs/kstd/include/kstd/units b/libs/kstd/include/kstd/units
index f6dcdb1..bc7e1b9 100644
--- a/libs/kstd/include/kstd/units
+++ b/libs/kstd/include/kstd/units
@@ -14,6 +14,11 @@ namespace kstd
   {
     using value_type = ValueType;
 
+    constexpr basic_unit() noexcept
+      : value{}
+    {
+    }
+
     explicit constexpr basic_unit(value_type value) noexcept
         : value{value}
     {}
@@ -142,4 +147,4 @@ namespace kstd
 
 }  // namespace kstd
 
-#endif
-\ No newline at end of file
+#endif
diff --git a/libs/multiboot2/include/multiboot2/constants/information_id.hpp b/libs/multiboot2/include/multiboot2/constants/information_id.hpp
index be492eb..27c5300 100644
--- a/libs/multiboot2/include/multiboot2/constants/information_id.hpp
+++ b/libs/multiboot2/include/multiboot2/constants/information_id.hpp
@@ -57,10 +57,10 @@ namespace multiboot2
     smbios_tables,
 
     //! A copy of RSDP as defined per ACPI 1.0 specification.
-    acpi_old_rsdp,
+    acpi_rsdp,
 
-    //! A copy of RSDP as defined per ACPI 2.0 or later specification.
-    acpi_new_rsdp,
+    //! A copy of XSDP as defined per ACPI 2.0 or later specification.
+    acpi_xsdp,
 
     //! The network information specified specified as per DHCP.
     networking_information,
@@ -83,4 +83,4 @@ namespace multiboot2
 
 }  // namespace multiboot2
 
-#endif
-\ No newline at end of file
+#endif
diff --git a/libs/multiboot2/include/multiboot2/information.hpp b/libs/multiboot2/include/multiboot2/information.hpp
index d2fac2e..a2ded56 100644
--- a/libs/multiboot2/include/multiboot2/information.hpp
+++ b/libs/multiboot2/include/multiboot2/information.hpp
@@ -11,6 +11,7 @@
 #include <elf/section_header.hpp>
 
 #include <algorithm>
+#include <cstddef>
 #include <cstdint>
 #include <cstdlib>
 #include <optional>
@@ -128,6 +129,26 @@ namespace multiboot2
       return kstd::units::bytes{end_address - start_address};
     }
   };
+  
+  struct acpi_rsdp : vla_tag<data::acpi_rsdp, std::byte, std::span>
+  {
+    using vla_tag::vla_tag;
+
+    [[nodiscard]] auto pointer() const noexcept -> range_type
+    {
+      return {data(), size()};
+    }
+  };
+
+  struct acpi_xsdp : vla_tag<data::acpi_xsdp, std::byte, std::span>
+  {
+    using vla_tag::vla_tag;
+
+    [[nodiscard]] auto pointer() const noexcept -> range_type
+    {
+      return {data(), size()};
+    }
+  };
 
   struct information_view
   {
@@ -245,6 +266,26 @@ namespace multiboot2
              std::views::transform(transform_module);
     }
 
+    [[nodiscard]] auto maybe_acpi_rsdp() const noexcept -> std::optional<acpi_rsdp>
+    {
+      return get<multiboot2::acpi_rsdp>();
+    }
+
+    [[nodiscard]] auto acpi_rsdp() const noexcept -> acpi_rsdp
+    {
+      return maybe_acpi_rsdp().value();
+    }
+
+    [[nodiscard]] auto maybe_acpi_xsdp() const noexcept -> std::optional<acpi_xsdp>
+    {
+      return get<multiboot2::acpi_xsdp>();
+    }
+
+    [[nodiscard]] auto acpi_xsdp() const noexcept -> acpi_xsdp
+    {
+      return maybe_acpi_xsdp().value();
+    }
+
   private:
     template<typename Tag>
     [[nodiscard]] constexpr auto get() const noexcept -> std::optional<Tag>
@@ -264,4 +305,4 @@ namespace multiboot2
 
 }  // namespace multiboot2
 
-#endif
-\ No newline at end of file
+#endif
diff --git a/libs/multiboot2/include/multiboot2/information/data.hpp b/libs/multiboot2/include/multiboot2/information/data.hpp
index 3b07d20..315eb39 100644
--- a/libs/multiboot2/include/multiboot2/information/data.hpp
+++ b/libs/multiboot2/include/multiboot2/information/data.hpp
@@ -167,8 +167,18 @@ namespace multiboot2
       std::uint32_t end_address;
     };
 
+    //! A copy of the ACPI RSDP
+    struct acpi_rsdp : tag_data<information_id::acpi_rsdp>
+    {
+    };
+
+    //! A copy of the ACPI XSDP
+    struct acpi_xsdp : tag_data<information_id::acpi_xsdp>
+    {
+    };
+
   }  // namespace data
 
 }  // namespace multiboot2
 
-#endif
-\ No newline at end of file
+#endif