UI: List PS1 EBOOTs, with their own disc ID

The game browser left out EBOOTs with the PS1 category, which couldn't
run. Now they're listed where the Media Engine can be emulated
(Memory::CanCreateMESpace). And as a PS1 game's PARAM.SFO has no
DISC_TOTAL, the browser took it for homebrew and gave it a made-up ID
(SCUS00580 for Crash Bandicoot's SCUS94900): its own is kept now.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Core/MemMap.cpp

@@ -689,6 +689,7 @@ AddressSpace *CreateMESpace() {
 	_dbg_assert_(base != nullptr && g_meSpace.base == nullptr);
 #if defined(MASKED_PSP_MEMORY) || defined(NO_MMAP)
 	// TODO: Masking would fold the eDRAM mirrors onto the scratchpad and boot page addresses.
+	static_assert(!CanCreateMESpace());
 	return nullptr;
 #else
 	size_t span = 0;

Core/MemMap.h

@@ -377,6 +377,14 @@ extern AddressSpace g_mainSpace;
 // as in g_mainSpace. Returns null if this platform can't map memory twice. Only for a boot that runs
 // the ME; Shutdown() (and so Reinit()) destroys it.
 AddressSpace *CreateMESpace();
+// Whether this platform can have one (not with masked memory, or without mmap).
+constexpr bool CanCreateMESpace() {
+#if defined(MASKED_PSP_MEMORY) || defined(NO_MMAP)
+	return false;
+#else
+	return true;
+#endif
+}
 void DestroyMESpace();
 
 void WriteOrException_U8(const u8 data, const u32 address);

UI/GameBrowser.cpp

@@ -38,6 +38,7 @@
 #include "Core/Util/RecentFiles.h"
 #include "Core/HLE/sceCtrl.h"
 #include "Core/ELF/PBPReader.h"
+#include "Core/MemMap.h"
 #include "Core/Util/VideoPlayer.h"
 
 #include "UI/GameBrowser.h"
@@ -986,7 +987,8 @@ static bool IsValidPBP(const Path &path, bool allowHomebrew) {
 	if (!allowHomebrew && sfo.GetValueString("DISC_ID").empty())
 		return false;
 
-	if (sfo.GetValueString("CATEGORY") == "ME")
+	// PS1 games, which need the Media Engine.
+	if (sfo.GetValueString("CATEGORY") == "ME" && !Memory::CanCreateMESpace())
 		return false;
 
 	return true;

UI/GameInfoCache.cpp

@@ -634,8 +634,10 @@ public:
 						info_->paramSFO.ReadSFO(sfoData);
 						info_->ParseParamSFO(fileType);
 
-						// Assuming PSP_PBP_DIRECTORY without ID or with disc_total < 1 in GAME dir must be homebrew
+						// Assuming PSP_PBP_DIRECTORY without ID or with disc_total < 1 in GAME dir must be homebrew.
+						// Not a PS1 game, whose PARAM.SFO has no DISC_TOTAL.
 						if ((info_->id.empty() || !info_->disc_total)
+							&& info_->paramSFO.GetValueString("CATEGORY") != "ME"
 							&& gamePath_.FilePathContainsNoCase("PSP/GAME/")
 							&& fileType == IdentifiedFileType::PSP_PBP_DIRECTORY) {
 							info_->id = g_paramSFO.GenerateFakeID(gamePath_);