diff --git a/src/hulk/hulk.d b/src/hulk/hulk.d
index f23f0bc..f6ae27a 100644
--- a/src/hulk/hulk.d
+++ b/src/hulk/hulk.d
@@ -33,12 +33,26 @@ private __gshared HulkHeader hulk_header = {
     HULK_VIRTUAL_FRAMEBUFFER_ADDRESS, /* virt_fb_buffer */
 };
 
+private void initialize_cpu()
+{
+    /* 1. Enable SSE. */
+    /* 1.a. Turn off CR0.EM and turn on CR0.MP. */
+    write_cr0((read_cr0() & ~CR0_EM) | CR0_MP);
+    /* 1.b. Set CR4.OSFXSR and CR4.OSXMMEXCPT. */
+    write_cr4(read_cr4() | CR4_OSFXSR | CR4_OSXMMEXCPT);
+    /* 2. Enable OSXSAVE. */
+ //   write_cr4(read_cr4() | CR4_OSXSAVE);
+    /* 3. Enable AVX. */
+//    xsetbv(0u, xgetbv(0u) | XCR0_X87 | XCR0_SSE | XCR0_AVX);
+}
+
 /**
  * HULK entry point.
  */
 void hulk_start()
 {
     cli();
+    initialize_cpu();
     gdt.initialize();
     idt.initialize();
     fb.initialize(cast(uint *)HULK_VIRTUAL_FRAMEBUFFER_ADDRESS, hulk_header.bootinfo.fb.width, hulk_header.bootinfo.fb.height, hulk_header.bootinfo.fb.stride);