Prepare GPU setup

include/PSX/System/IOPorts/GPU_IO.hpp

@@ -36,9 +36,33 @@ namespace GPU {
             GPU2CPU = 3,
         };
 
-        struct __no_align Command : public ComplexBitMap<uint32_t> {
+        enum struct DisplayState {
+            On  = 0,
+            Off = 1
         };
 
+        namespace Command {
+            static constexpr uint32_t construct_cmd(uint8_t cmd, uint32_t value) {
+                return ((cmd << 24) | value);
+            }
+
+            struct __no_align GP0 : public ComplexBitMap<uint32_t> {
+                __io_port_inherit_complex_bit_map(GP0);
+            };
+
+            struct __no_align GP1 : public ComplexBitMap<uint32_t> {
+                __io_port_inherit_complex_bit_map(GP1);
+
+                static constexpr GP1 Reset() {
+                    return {0};
+                }
+
+                static constexpr GP1 SetDisplayState(DisplayState state) {
+                    return {construct_cmd(0x03, static_cast<uint32_t>(state))};
+                }
+            };
+        }
+
         struct __no_align GPUStatusRegister : public ComplexBitMap<uint32_t> {
             static constexpr auto DrawingOddLinesInterlaced    = Bit<uint32_t>(31);
             static constexpr auto DMADirectionValue            = BitRange<DMADirection>::from_to(29, 30);
@@ -68,6 +92,10 @@ namespace GPU {
             static constexpr auto TexturePageY256       = Bit<uint32_t>(4);
         };
 
+        __declare_io_port_global(Command::GP0, GP0, 0x1F801810);
+        __declare_io_port_global(Command::GP1, GP1, 0x1F801814);
+
+        __declare_io_port_global_const(uint32_t,          GPUREAD, 0x1F801810);
         __declare_io_port_global_const(GPUStatusRegister, GPUSTAT, 0x1F801814);
     }
 }

src/Library/src/BootLoader/gpu_boot.cpp

@@ -1,7 +1,8 @@
-#include <PSX/GPU/GPU_Types.hpp>
+#include <PSX/System/IOPorts/GPU_IO.hpp>
 
 namespace GPU {
     void setup() {
-
+        Port::GP1.write(Port::Command::GP1::Reset());
+        Port::GP1.write(Port::Command::GP1::SetDisplayState(Port::DisplayState::On));
     }
 }