preserve-emulation/ppsspp
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CPU: Add the Media Engine core, off by default

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MeCore owns a second MIPSState in the ME's address space, held in reset
until released (SetReset). It runs on the interpreter, a slice behind the
main CPU: CoreTiming runs it for the cycles the main CPU has just used, in
Advance and ForceCheck. Its own PRId (COP0 22) and mfic/mtic flag; MMIO
counts as kernel mode on it, and a syscall stops it with an error rather
than reaching HLE. The interpreter's block stepping reads delay slots
through the stepping CPU's memory, and cache instructions log at verbose
level, as ME code flushes its caches in a loop.

Created at boot only for homebrew (PBP with MG category or no SFO, ELF;
the VSH counts, as vshmain.prx loads as an ELF), when "Enable ME
emulation for homebrew" is on: a global checkbox in developer settings,
off by default and not translated yet, or --me-core. Saved in its own
section after MMIO (SaveStart v5), with its own memory; loading a state
creates or removes the ME to match.

The boot page now starts with a reset stub that sends the ME on to
0xBFC00040, where homebrew puts its code (from the firmware's reset code,
read on a PSP-1000).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Henrik RydgårdandClaude Opus 5.5 committed 2026-10-20 22:22:40 +02:00
1 parent 41851007a2
commit fef84cf0ca
26 files changed
+377 -10
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Core/CmdLine.cpp
+5
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@@ -210,6 +210,7 @@ static const CommandLineParam g_autoParams[] = {
{POFF(dumpCompat), CmdParamType::Bool, "dump-compat", '\0', "Apply the game's compat.ini settings when replaying a GE frame dump (off by default)", CmdLineMode::Headless},
{POFF(hardwareTransform), CmdParamType::Bool, "hardware-transform", '\0', "Transform vertices on the GPU (default true); false transforms them on the CPU", CmdLineMode::Headless},
{POFF(vertexJit), CmdParamType::Bool, "vertex-jit", '\0', "Decode vertices with the JIT where the host can (default; =false for the C++ decoder)", CmdLineMode::Headless},
{POFF(emulateMediaEngine), CmdParamType::Bool, "me-core", '\0', "Emulate the Media Engine for homebrew that runs code on it (default false)"},
{POFF(shaderCache), CmdParamType::Bool, "shader-cache", '\0', "Load and save the per-game shader cache (default true); =false to time shader compiles like a first boot"},
{POFF(disableGPUFeatures), CmdParamType::String, "disable-gpu-features", '\0', "Act as if the GPU lacked these, to test the fallbacks: comma-separated clip-distance, cull-distance, depth-clamp, framebuffer-fetch, dual-source-blend", CmdLineMode::Headless},
{POFF(depthFilenameSave), CmdParamType::String, "depth-save", '\0', "Save the depth buffer to FILE along with the screenshot (u32 width, u32 height, u16 depths; float depths if FILE ends in .f32)", CmdLineMode::Headless},
@@ -568,6 +569,10 @@ void CommandLineOptions::ApplyToConfig() const {
g_Config.bHardwareTransform = hardwareTransform.value();
g_Config.DoNotSaveSetting(&g_Config.bHardwareTransform);
}
if (emulateMediaEngine.has_value()) {
g_Config.bEmulateMediaEngine = emulateMediaEngine.value();
g_Config.DoNotSaveSetting(&g_Config.bEmulateMediaEngine);
}
if (shaderCache.has_value()) {
g_Config.bShaderCache = shaderCache.value();
g_Config.DoNotSaveSetting(&g_Config.bShaderCache);