diff --git a/src/hulk/acpi.d b/src/hulk/acpi.d
new file mode 100644
index 0000000..487f611
--- /dev/null
+++ b/src/hulk/acpi.d
@@ -0,0 +1,101 @@
+/**
+ * ACPI (Advanced Configuration and Power Interface) functionality.
+ */
+module hulk.acpi;
+
+import hulk.klog;
+import hulk.hurl;
+import hulk.klog;
+import hos.memory;
+
+struct acpi
+{
+    enum uint APIC_SIGNATURE = 0x43495041u;
+    enum uint XSDT_SIGNATURE = 0x54445358u;
+
+    struct XsdtHeader
+    {
+        uint signature;
+        uint length;
+        ubyte revision;
+        ubyte checksum;
+        char[6] oemid;
+        ulong oemtableid;
+        uint oem_revision;
+        uint creator_id;
+        uint creator_revision;
+    };
+
+    struct Xsdt
+    {
+        XsdtHeader header;
+        uint _pad;
+        ulong[0] tables;
+    }
+
+    struct MadtHeader
+    {
+        uint signature;
+        uint length;
+        ubyte revision;
+        ubyte checksum;
+        char[6] oemid;
+        ulong oemtableid;
+        uint oem_revision;
+        uint creator_id;
+        uint creator_revision;
+        uint local_apic_address;
+        uint flags;
+    }
+
+    struct MadtEntry
+    {
+        ubyte type;
+        ubyte length;
+    }
+
+    private static ulong apic_address;
+
+    public static void initialize(ulong acpi_xsdt_phys)
+    {
+        /* Map the XSDT header. */
+        Hurl.map_range(acpi_xsdt_phys, Xsdt.sizeof, 0u);
+        const(Xsdt) * xsdt = cast(const(Xsdt) *)acpi_xsdt_phys;
+        if (xsdt.header.signature != XSDT_SIGNATURE)
+        {
+            klog.writef("XSDT signature invalid\n");
+            return;
+        }
+        /* Map the entire XSDT. */
+        Hurl.map_range(acpi_xsdt_phys, xsdt.header.length, 0u);
+        size_t n_entries = (xsdt.header.length - xsdt.header.sizeof) / xsdt.tables[0].sizeof;
+        for (size_t i = 0u; i < n_entries; i++)
+        {
+            ulong address = xsdt.tables[i];
+            Hurl.map_range(address, 4u, 0u);
+            uint signature = *cast(const(uint) *)address;
+            if (signature == APIC_SIGNATURE)
+            {
+                parse_apic_table(address);
+            }
+        }
+    }
+
+    private static parse_apic_table(ulong address)
+    {
+        const(MadtHeader) * madt_header = cast(const(MadtHeader) *)address;
+        Hurl.map_range(address, madt_header.length, 0u);
+        apic_address = madt_header.local_apic_address;
+        const(void) * madt_end = cast(const(void) *)(address + madt_header.length);
+        const(MadtEntry) * madt_entry = cast(const(MadtEntry) *)(address + 0x2Cu);
+        while (madt_entry < madt_end)
+        {
+            madt_entry = cast(const(MadtEntry) *)(cast(size_t)madt_entry + madt_entry.length);
+            if (madt_entry.type == 5u)
+            {
+                /* Found a 64-bit Local APIC Address Override entry. */
+                memcpy(cast(void *)&apic_address, cast(const(void) *)madt_entry + 4u, 8u);
+            }
+        }
+    }
+}
diff --git a/src/hulk/hulk.d b/src/hulk/hulk.d
index eab7d4b..3dca180 100644
--- a/src/hulk/hulk.d
+++ b/src/hulk/hulk.d
@@ -18,6 +18,7 @@ import hulk.idt;
 import hos.cpu;
 import ldc.llvmasm;
 import hulk.pic;
+import hulk.acpi;
 
 extern extern(C) __gshared ubyte _hulk_total_size;
 
@@ -49,6 +50,7 @@ void hulk_start()
     hippo.initialize(&hulk_header);
     pci.initialize();
     pic.initialize();
+    acpi.initialize(hulk_header.bootinfo.acpi_xsdt_phys);
     sti();
 
     for (;;)