Add PowerOff IOP module stub

Makes ScummVM boot, if LIBSD is provided in rom0

Source/CMakeLists.txt

@@ -319,6 +319,8 @@ set(COMMON_SRC_FILES
 	iop/Iop_PadMan.h
 	iop/Iop_PathUtils.cpp
 	iop/Iop_PathUtils.h
+	iop/Iop_PowerOff.cpp
+	iop/Iop_PowerOff.h
 	iop/Iop_RootCounters.cpp
 	iop/Iop_RootCounters.h
 	iop/Iop_Secrman.cpp

Source/iop/IopBios.cpp

@@ -254,6 +254,10 @@ void CIopBios::Reset(const Iop::SifManPtr& sifMan)
 		m_mcserv = std::make_shared<Iop::CMcServ>(*this, *m_sifMan, *m_sifCmd, *m_sysmem, m_ram);
 		RegisterModule(m_mcserv);
 	}
+	{
+		m_powerOff = std::make_shared<Iop::CPowerOff>(*m_sifMan);
+		RegisterModule(m_powerOff);
+	}
 	RegisterModule(std::make_shared<Iop::CIomanX>(*m_ioman));
 	//RegisterModule(std::make_shared<Iop::CNaplink>(*m_sifMan, *m_ioman));
 	{

Source/iop/IopBios.h

@@ -26,6 +26,7 @@
 #include "Iop_MtapMan.h"
 #include "Iop_Cdvdfsv.h"
 #include "Iop_McServ.h"
+#include "Iop_PowerOff.h"
 #endif
 
 class CIopBios : public Iop::CBiosBase
@@ -680,6 +681,7 @@ private:
 	Iop::MtapManPtr m_mtapman;
 	Iop::McServPtr m_mcserv;
 	Iop::CdvdfsvPtr m_cdvdfsv;
+	Iop::PowerOffPtr m_powerOff;
 
 	std::map<std::string, Iop::ModulePtr> m_hleModules;
 #endif

Source/iop/Iop_PowerOff.cpp

@@ -0,0 +1,41 @@
+#include "Iop_PowerOff.h"
+#include "Log.h"
+#include "Iop_SifMan.h"
+
+#define LOG_NAME ("iop_poweroff")
+
+using namespace Iop;
+
+CPowerOff::CPowerOff(CSifMan& sifMan)
+{
+	sifMan.RegisterModule(MODULE_ID, this);
+}
+
+std::string CPowerOff::GetId() const
+{
+	return "poweroff";
+}
+
+std::string CPowerOff::GetFunctionName(unsigned int functionId) const
+{
+	return "unknown";
+}
+
+void CPowerOff::Invoke(CMIPS& context, unsigned int functionId)
+{
+	switch(functionId)
+	{
+	default:
+		CLog::GetInstance().Warn(LOG_NAME, "%08X: Unknown function (%d) called.\r\n", context.m_State.nPC, functionId);
+		break;
+	}
+}
+bool CPowerOff::Invoke(uint32 method, uint32* args, uint32 argsSize, uint32* ret, uint32 retSize, uint8* ram)
+{
+	switch(method)
+	{
+	default:
+		CLog::GetInstance().Warn(LOG_NAME, "Unknown RPC method invoked (0x%08X).\r\n", method);
+		return true;
+	}
+}

Source/iop/Iop_PowerOff.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "Iop_Module.h"
+#include "Iop_SifMan.h"
+
+// Not an actual implementation of the PowerOff module.
+// For insights what this emulates see here:
+// https://github.com/ps2dev/ps2sdk/blob/c80310b3967a0ef3f8cb3cf20e469d7763fe0e9a/iop/dev9/poweroff/src/poweroff.c
+// Some homebrew (e.g. ScummVM) expect the module to be loaded beforehand on the IOP
+// via the ELF loader (e.g. ps2link), and thus don't load it themselves.
+// In the future, this module should only be loaded on ELF files, and not on discs.
+
+namespace Iop
+{
+	class CPowerOff : public CModule, public CSifModule
+	{
+	public:
+		CPowerOff(Iop::CSifMan& sifMan);
+		virtual ~CPowerOff() = default;
+
+		std::string GetId() const override;
+		std::string GetFunctionName(unsigned int) const override;
+		void Invoke(CMIPS&, unsigned int) override;
+		bool Invoke(uint32, uint32*, uint32, uint32*, uint32, uint8*) override;
+
+	private:
+		enum MODULE_ID
+		{
+			MODULE_ID = 0x09090900,
+		};
+	};
+
+	typedef std::shared_ptr<CPowerOff> PowerOffPtr;
+}