Emulator: Put startup into a Loader class

src/loader.cpp

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2022 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "loader.h"
+#include "cpu.h"
+#include "emu.h"
+#include "ppu.h"
+#include "ruc/file.h"
+
+void Loader::init()
+{
+	destroy();
+
+	Emu::the().init(8000000);
+
+	CPU cpu(8000000);
+	PPU ppu(4000000);
+
+	Emu::the().addProcessingUnit("cpu", &cpu);
+	Emu::the().addProcessingUnit("ppu", &ppu);
+
+	// https://gbdev.io/pandocs/Memory_Map.html
+	// https://gbdev.io/pandocs/Power_Up_Sequence.html
+	Emu::the().addMemorySpace("BOOTROM1", 0x0000, 0x00ff);   // 256B
+	Emu::the().addMemorySpace("BOOTROM2", 0x0200, 0x08ff);   // 1792B
+	Emu::the().addMemorySpace("VRAM", 0x8000, 0x9fff, 2);    // 8KiB * 2 banks
+	Emu::the().addMemorySpace("CARDRAM", 0xa000, 0xbfff, 1); // 8KiB * ? banks, if any
+	Emu::the().addMemorySpace("WRAM1", 0xc000, 0xcfff);      // 4 KiB, Work RAM
+	Emu::the().addMemorySpace("WRAM2", 0xd000, 0xdfff, 7);   // 4 KiB * 7 banks, Work RAM
+	Emu::the().addMemorySpace("ECHORAM", 0xe000, 0xfdff);    // 7680B, Mirror of 0xc000~0xddff
+	Emu::the().addMemorySpace("OAM", 0xfe00, 0xfe9f);        // 160B, Object Attribute Memory (VRAM Sprite Attribute Table)
+	Emu::the().addMemorySpace("Not Usable", 0xfea0, 0xfeff); // 96B, Nintendo probibits this area
+	Emu::the().addMemorySpace("IO", 0xff00, 0xff7f);         // 128B, I/O Registers
+	Emu::the().addMemorySpace("HRAM", 0xff80, 0xfffe);       // 127B, High RAM (CPU cache)
+	Emu::the().addMemorySpace("IE", 0xffff, 0xffff);         // 1B, Interrupt Enable register
+
+	// Load bootrom
+	auto bootrom = ruc::File("gbc_bios.bin").data();
+	for (size_t i = 0; i < bootrom.length(); ++i) {
+		// Skip cartridge header memory range
+		if (i >= 0x0100 && i <= 0x01ff) {
+			continue;
+		}
+
+		Emu::the().writeMemory(i, bootrom[i]);
+	}
+
+	while (true) {
+		Emu::the().update();
+	}
+}
+
+void Loader::destroy()
+{
+	Emu::destroy();
+}