[GPU] Get PICA register access working

include/gpu.hpp

@@ -1,12 +1,23 @@
 #pragma once
+#include <array>
 #include "helpers.hpp"
 #include "memory.hpp"
 
 class GPU {
 	Memory& mem;
+	static constexpr u32 regNum = 0x300;
+	std::array<u32, regNum> regs; // GPU internal registers
 
 public:
 	GPU(Memory& mem) : mem(mem) {}
 	void clearBuffer(u32 startAddress, u32 endAddress, u32 value, u32 control);
 	void reset();
+
+	// Used by the GSP GPU service for readHwRegs/writeHwRegs/writeHwRegsMasked
+	u32 readReg(u32 address);
+	void writeReg(u32 address, u32 value);
+
+	// Used when processing GPU command lists
+	u32 readInternalReg(u32 index);
+	void writeInternalReg(u32 index, u32 value, u32 mask);
 };