1 files changed, 51 insertions, 0 deletions
diff --git a/src/acpi.cpp b/src/acpi.cpp
new file mode 100644
index 0000000..b74a7dc
--- /dev/null
+++ b/src/acpi.cpp
@@ -0,0 +1,51 @@
+#include "textoutput.hpp"
+
+#include <cstdint>
+
+extern TextOutput& term;
+extern std::uint32_t *acpiRsdp;
+extern std::uint32_t *acpiRsdpV2;
+
+struct XSDP {
+   char Signature[8];
+   std::uint8_t Checksum;
+   char OEMID[6];
+   std::uint8_t Revision;
+   std::uint32_t RsdtAddress;      // deprecated since version 2.0
+
+   // v2 only!
+   std::uint32_t Length;
+   std::uint64_t XsdtAddress;
+   std::uint8_t ExtendedChecksum;
+   std::uint8_t reserved[3];
+} __attribute__ ((packed));
+
+struct SDTHeader {
+    char Signature[4];
+    std::uint32_t Length;
+    std::uint8_t Revision;
+    std::uint8_t Checksum;
+    char OEMID[6];
+    char OEMTableID[8];
+    std::uint32_t OEMRevision;
+    std::uint32_t CreatorID;
+    std::uint32_t CreatorRevision;
+};
+
+static XSDP *rsdp = nullptr;
+
+void acpi_initialize()
+{
+    if (acpiRsdp) {
+        term.write("ACPI v1 detected.\n");
+        rsdp = reinterpret_cast<XSDP *>(acpiRsdp);
+    } else if (acpiRsdpV2) {
+        term.write("ACPI v2 detected, treating as v1.\n");
+        rsdp = reinterpret_cast<XSDP *>(acpiRsdpV2);
+    }
+
+    //if (rsdp) {
+    //    auto sdt = reinterpret_cast<SDTHeader *>(rsdp->RsdtAddress);
+    //}
+}
+