Kernel: Switch singletons to use new Singleton class

MemoryManager cannot use the Singleton class because
MemoryManager::initialize is called before the global constructors
are run. That caused the Singleton to be re-initialized, causing
it to create another MemoryManager instance.

Fixes #3226

Kernel/Devices/BXVGADevice.cpp

@@ -25,6 +25,7 @@
  */
 
 #include <AK/Checked.h>
+#include <AK/Singleton.h>
 #include <Kernel/Devices/BXVGADevice.h>
 #include <Kernel/IO.h>
 #include <Kernel/PCI/Access.h>
@@ -56,7 +57,12 @@ namespace Kernel {
 #define VBE_DISPI_ENABLED 0x01
 #define VBE_DISPI_LFB_ENABLED 0x40
 
-static BXVGADevice* s_the;
+static AK::Singleton<BXVGADevice> s_the;
+
+void BXVGADevice::initialize()
+{
+    s_the.ensure_instance();
+}
 
 BXVGADevice& BXVGADevice::the()
 {
@@ -67,7 +73,6 @@ BXVGADevice::BXVGADevice()
     : BlockDevice(29, 0)
 
 {
-    s_the = this;
     m_framebuffer_address = PhysicalAddress(find_framebuffer_address());
     set_safe_resolution();
 }

Kernel/Devices/BXVGADevice.h

@@ -36,6 +36,7 @@ namespace Kernel {
 class BXVGADevice final : public BlockDevice {
     AK_MAKE_ETERNAL
 public:
+    static void initialize();
     static BXVGADevice& the();
 
     BXVGADevice();

Kernel/Devices/Device.cpp

@@ -24,18 +24,17 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <AK/Singleton.h>
 #include <Kernel/Devices/Device.h>
 #include <Kernel/FileSystem/InodeMetadata.h>
 #include <LibC/errno_numbers.h>
 
 namespace Kernel {
 
-static HashMap<u32, Device*>* s_all_devices;
+static AK::Singleton<HashMap<u32, Device*>> s_all_devices;
 
 HashMap<u32, Device*>& Device::all_devices()
 {
-    if (s_all_devices == nullptr)
-        s_all_devices = new HashMap<u32, Device*>;
     return *s_all_devices;
 }
 

Kernel/Devices/KeyboardDevice.cpp

@@ -26,6 +26,7 @@
 
 #include <AK/Assertions.h>
 #include <AK/ByteBuffer.h>
+#include <AK/Singleton.h>
 #include <AK/StringView.h>
 #include <AK/Types.h>
 #include <Kernel/Arch/i386/CPU.h>
@@ -335,11 +336,15 @@ void KeyboardDevice::handle_irq(const RegisterState&)
     }
 }
 
-static KeyboardDevice* s_the;
+static AK::Singleton<KeyboardDevice> s_the;
+
+void KeyboardDevice::initialize()
+{
+    s_the.ensure_instance();
+}
 
 KeyboardDevice& KeyboardDevice::the()
 {
-    ASSERT(s_the);
     return *s_the;
 }
 
@@ -347,8 +352,6 @@ KeyboardDevice::KeyboardDevice()
     : IRQHandler(IRQ_KEYBOARD)
     , CharacterDevice(85, 1)
 {
-    s_the = this;
-
     // Empty the buffer of any pending data.
     // I don't care what you've been pressing until now!
     while (IO::in8(I8042_STATUS) & I8042_BUFFER_FULL)

Kernel/Devices/KeyboardDevice.h

@@ -45,6 +45,7 @@ class KeyboardDevice final : public IRQHandler
 public:
     using Event = KeyEvent;
 
+    static void initialize();
     static KeyboardDevice& the();
 
     virtual ~KeyboardDevice() override;

Kernel/Devices/NullDevice.cpp

@@ -25,22 +25,26 @@
  */
 
 #include "NullDevice.h"
+#include <AK/Singleton.h>
 #include <AK/StdLibExtras.h>
 
 namespace Kernel {
 
-static NullDevice* s_the;
+static AK::Singleton<NullDevice> s_the;
+
+void NullDevice::initialize()
+{
+    s_the.ensure_instance();
+}
 
 NullDevice& NullDevice::the()
 {
-    ASSERT(s_the);
     return *s_the;
 }
 
 NullDevice::NullDevice()
     : CharacterDevice(1, 3)
 {
-    s_the = this;
 }
 
 NullDevice::~NullDevice()

Kernel/Devices/NullDevice.h

@@ -36,6 +36,7 @@ public:
     NullDevice();
     virtual ~NullDevice() override;
 
+    static void initialize();
     static NullDevice& the();
 
 private:

Kernel/Devices/PATAChannel.cpp

@@ -25,6 +25,7 @@
  */
 
 #include <AK/ByteBuffer.h>
+#include <AK/Singleton.h>
 #include <AK/StringView.h>
 #include <Kernel/Devices/PATAChannel.h>
 #include <Kernel/Devices/PATADiskDevice.h>
@@ -106,13 +107,12 @@ namespace Kernel {
 
 #define PCI_Mass_Storage_Class 0x1
 #define PCI_IDE_Controller_Subclass 0x1
+
+static AK::Singleton<Lock> s_pata_lock;
+
 static Lock& s_lock()
 {
-    static Lock* lock;
-    if (!lock)
-        lock = new Lock;
-
-    return *lock;
+    return *s_pata_lock;
 };
 
 OwnPtr<PATAChannel> PATAChannel::create(ChannelType type, bool force_pio)

Kernel/Devices/PS2MouseDevice.cpp

@@ -25,6 +25,7 @@
  */
 
 #include <AK/Memory.h>
+#include <AK/Singleton.h>
 #include <Kernel/Devices/PS2MouseDevice.h>
 #include <Kernel/Devices/VMWareBackdoor.h>
 #include <Kernel/IO.h>
@@ -56,13 +57,12 @@ namespace Kernel {
 
 //#define PS2MOUSE_DEBUG
 
-static PS2MouseDevice* s_the;
+static AK::Singleton<PS2MouseDevice> s_the;
 
 PS2MouseDevice::PS2MouseDevice()
     : IRQHandler(IRQ_MOUSE)
     , CharacterDevice(10, 1)
 {
-    s_the = this;
     initialize();
 }
 
@@ -70,6 +70,11 @@ PS2MouseDevice::~PS2MouseDevice()
 {
 }
 
+void PS2MouseDevice::create()
+{
+   s_the.ensure_instance();
+}
+
 PS2MouseDevice& PS2MouseDevice::the()
 {
     return *s_the;

Kernel/Devices/PS2MouseDevice.h

@@ -40,6 +40,7 @@ public:
     PS2MouseDevice();
     virtual ~PS2MouseDevice() override;
 
+    static void create();
     static PS2MouseDevice& the();
 
     // ^CharacterDevice

Kernel/Devices/SB16.cpp

@@ -25,6 +25,7 @@
  */
 
 #include <AK/Memory.h>
+#include <AK/Singleton.h>
 #include <AK/StringView.h>
 #include <Kernel/Devices/SB16.h>
 #include <Kernel/Thread.h>
@@ -76,13 +77,12 @@ void SB16::set_sample_rate(uint16_t hz)
     dsp_write((u8)hz);
 }
 
-static SB16* s_the;
+static AK::Singleton<SB16> s_the;
 
 SB16::SB16()
     : IRQHandler(SB16_DEFAULT_IRQ)
     , CharacterDevice(42, 42) // ### ?
 {
-    s_the = this;
     initialize();
 }
 
@@ -90,6 +90,11 @@ SB16::~SB16()
 {
 }
 
+void SB16::create()
+{
+    s_the.ensure_instance();
+}
+
 SB16& SB16::the()
 {
     return *s_the;

Kernel/Devices/SB16.h

@@ -42,6 +42,7 @@ public:
     SB16();
     virtual ~SB16() override;
 
+    static void create();
     static SB16& the();
 
     // ^CharacterDevice

Kernel/Devices/VMWareBackdoor.cpp

@@ -25,6 +25,8 @@
  */
 
 #include <AK/Assertions.h>
+#include <AK/OwnPtr.h>
+#include <AK/Singleton.h>
 #include <AK/String.h>
 #include <Kernel/Arch/i386/CPU.h>
 #include <Kernel/CommandLine.h>
@@ -80,33 +82,40 @@ inline void vmware_high_bandwidth_get(VMWareCommand& command)
                  : "+a"(command.ax), "+b"(command.bx), "+c"(command.cx), "+d"(command.dx), "+S"(command.si), "+D"(command.di));
 }
 
-static VMWareBackdoor* s_vmware_backdoor;
-
-static bool detect_presence()
+class VMWareBackdoorDetector
 {
-    VMWareCommand command;
-    command.bx = ~VMWARE_MAGIC;
-    command.command = VMWARE_CMD_GETVERSION;
-    vmware_out(command);
-    if (command.bx != VMWARE_MAGIC || command.ax == 0xFFFFFFFF)
-        return false;
-    return true;
-}
+public:
+    VMWareBackdoorDetector()
+    {
+        if (detect_presence())
+            m_backdoor = make<VMWareBackdoor>();
+    }
 
-VMWareBackdoor* VMWareBackdoor::initialize()
-{
-    ASSERT(s_vmware_backdoor == nullptr);
-    if (!detect_presence())
-        return nullptr;
+    VMWareBackdoor* get_instance()
+    {
+        return m_backdoor.ptr();
+    }
 
-    s_vmware_backdoor = new VMWareBackdoor;
-    klog() << "VMWare backdoor opened.";
-    return s_vmware_backdoor;
-}
+private:
+    static bool detect_presence()
+    {
+        VMWareCommand command;
+        command.bx = ~VMWARE_MAGIC;
+        command.command = VMWARE_CMD_GETVERSION;
+        vmware_out(command);
+        if (command.bx != VMWARE_MAGIC || command.ax == 0xFFFFFFFF)
+            return false;
+        return true;
+    }
+
+    OwnPtr<VMWareBackdoor> m_backdoor;
+};
+
+static AK::Singleton<VMWareBackdoorDetector> s_vmware_backdoor;
 
 VMWareBackdoor* VMWareBackdoor::the()
 {
-    return s_vmware_backdoor;
+    return s_vmware_backdoor->get_instance();
 }
 
 VMWareBackdoor::VMWareBackdoor()

Kernel/Devices/VMWareBackdoor.h

@@ -63,9 +63,9 @@ class VMWareBackdoor {
     AK_MAKE_ETERNAL;
 
 public:
+    VMWareBackdoor();
     static VMWareBackdoor* the();
 
-    static VMWareBackdoor* initialize();
     bool vmmouse_is_absolute() const;
     void enable_absolute_vmmouse();
     void disable_absolute_vmmouse();
@@ -76,7 +76,6 @@ public:
 private:
     void send_high_bandwidth(VMWareCommand& command);
     void get_high_bandwidth(VMWareCommand& command);
-    VMWareBackdoor();
     bool detect_vmmouse();
     bool m_vmmouse_absolute { false };
 };