Add apic module that does not do anything yet

src/hulk/acpi.d

@@ -3,7 +3,6 @@
  */
 module hulk.acpi;
 
-import hulk.klog;
 import hulk.hurl;
 import hulk.klog;
 import hos.memory;
@@ -54,7 +53,7 @@ struct acpi
         ubyte length;
     }
 
-    private static ulong apic_address;
+    public static __gshared ulong apic_address;
 
     public static void initialize(ulong acpi_xsdt_phys)
     {
@@ -86,6 +85,7 @@ struct acpi
         const(MadtHeader) * madt_header = cast(const(MadtHeader) *)address;
         Hurl.map_range(address, madt_header.length, 0u);
         apic_address = madt_header.local_apic_address;
+        klog.writefln("Found 32-bit APIC address: 0x%x", 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)
@@ -95,6 +95,7 @@ struct acpi
             {
                 /* Found a 64-bit Local APIC Address Override entry. */
                 memcpy(cast(void *)&apic_address, cast(const(void) *)madt_entry + 4u, 8u);
+                klog.writefln("Found 64-bit APIC address: 0x%x", apic_address);
             }
         }
     }

src/hulk/apic.d

@@ -0,0 +1,22 @@
+/**
+ * APIC (Advanced Programmable Interrupt Controller) functionality.
+ */
+module hulk.apic;
+
+import hulk.klog;
+import hulk.hurl;
+import hulk.acpi;
+
+struct apic
+{
+    public enum uint * local_apic_registers = cast(uint *)0xFEE0_0000u;
+
+    public static void initialize()
+    {
+        Hurl.map(cast(ulong)local_apic_registers,
+                cast(ulong)local_apic_registers,
+                MAP_WRITABLE | MAP_WRITE_THROUGH | MAP_DISABLE_CACHE | MAP_NO_EXECUTE);
+        klog.writefln("LAPIC ID: 0x%08x", local_apic_registers[0x20/4]);
+        klog.writefln("LAPIC version: 0x%08x", local_apic_registers[0x30/4]);
+    }
+}

src/hulk/hulk.d

@@ -19,6 +19,7 @@ import hos.cpu;
 import ldc.llvmasm;
 import hulk.pic;
 import hulk.acpi;
+import hulk.apic;
 
 extern extern(C) __gshared ubyte _hulk_total_size;
 
@@ -52,6 +53,7 @@ void hulk_start()
     pci.initialize();
     pic.initialize();
     acpi.initialize(hulk_header.bootinfo.acpi_xsdt_phys);
+    apic.initialize();
     sti();
 
     for (;;)

src/hulk/hurl.d

@@ -83,7 +83,7 @@ struct Hurl
             return opIndexAssign(pte, cast(ulong)address, level);
         }
 
-        private ulong pt_index(ulong address, ulong level)
+        public ulong pt_index(ulong address, ulong level)
         {
             return (address >> (39u - (9u * level))) & 0x1FFu;
         }
@@ -140,7 +140,7 @@ struct Hurl
         for (size_t level = 0; level < 4u; level++)
         {
             PageTableEntry entry = (*pt)[address, level];
-            klog.writefln("Level %u, entry = 0x%x", level, entry);
+            klog.writefln("Level %u, index %u, entry = 0x%x", level, pt.pt_index(cast(ulong)address, level), entry);
             if (entry.present)
             {
                 pt = entry.follow();