feat: Ahci, ACPI shutdown

kernel/src/ACPI/AcpiShutdown.cpp

@@ -0,0 +1,78 @@
+/*
+    * AcpiShutdown.cpp
+    * ACPI S5 (soft-off) shutdown via PM1 control registers
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#include "AcpiShutdown.hpp"
+#include <ACPI/FADT.hpp>
+#include <ACPI/AML/AmlParser.hpp>
+#include <Io/IoPort.hpp>
+#include <Terminal/Terminal.hpp>
+#include <CppLib/Stream.hpp>
+#include <Memory/HHDM.hpp>
+
+using namespace Kt;
+
+namespace Hal {
+    namespace AcpiShutdown {
+
+        static constexpr uint16_t SLP_EN = 1 << 13;
+
+        static bool     g_available = false;
+        static uint32_t g_pm1aControlBlock = 0;
+        static uint32_t g_pm1bControlBlock = 0;
+        static uint16_t g_slpTypA = 0;
+        static uint16_t g_slpTypB = 0;
+
+        void Initialize(ACPI::CommonSDTHeader* xsdt) {
+            FADT::ParsedFADT fadt{};
+            if (!FADT::Parse(xsdt, fadt) || !fadt.Valid) {
+                KernelLogStream(ERROR, "ACPI") << "Failed to parse FADT — ACPI shutdown unavailable";
+                return;
+            }
+
+            // Map and parse the DSDT to find \_S5_
+            auto* dsdt = (void*)Memory::HHDM(fadt.DsdtAddress);
+            AML::S5Object s5 = AML::FindS5(dsdt);
+
+            if (!s5.Valid) {
+                KernelLogStream(ERROR, "ACPI") << "Could not find \\_S5_ in DSDT — ACPI shutdown unavailable";
+                return;
+            }
+
+            g_pm1aControlBlock = fadt.PM1aControlBlock;
+            g_pm1bControlBlock = fadt.PM1bControlBlock;
+            g_slpTypA = s5.SLP_TYPa;
+            g_slpTypB = s5.SLP_TYPb;
+            g_available = true;
+
+            KernelLogStream(OK, "ACPI") << "ACPI shutdown initialized (PM1a=" << base::hex
+                << (uint64_t)g_pm1aControlBlock << " SLP_TYPa=" << (uint64_t)g_slpTypA << ")";
+        }
+
+        bool IsAvailable() {
+            return g_available;
+        }
+
+        void Shutdown() {
+            if (!g_available) return;
+
+            KernelLogStream(INFO, "ACPI") << "Performing ACPI S5 shutdown...";
+
+            // Write SLP_TYPa | SLP_EN to PM1a control register
+            Io::Out16((g_slpTypA << 10) | SLP_EN, (uint16_t)g_pm1aControlBlock);
+
+            // If PM1b exists, write to it as well
+            if (g_pm1bControlBlock != 0) {
+                Io::Out16((g_slpTypB << 10) | SLP_EN, (uint16_t)g_pm1bControlBlock);
+            }
+
+            // If we're still here, the shutdown didn't work immediately.
+            // Halt and wait for the hardware to power off.
+            for (;;) {
+                asm volatile("hlt");
+            }
+        }
+    };
+};