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Emulate memory behavior of libSceGnmDriver _DT_INIT

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Due to the unique way some games check for sceKernelAllocateDirectMemory failures, emulating this properly is necessary.
This commit is contained in:
Stephen Miller 2025-04-18 09:39:30 -05:00
parent df89241eb8
commit de549a23dc
2 changed files with 14 additions and 2 deletions
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2
src/core/libraries/gnmdriver/gnmdriver.cpp
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@ -2804,7 +2804,7 @@ void RegisterlibSceGnmDriver(Core::Loader::SymbolsResolver* sym) {
liverpool = std::make_unique<AmdGpu::Liverpool>();
presenter = std::make_unique<Vulkan::Presenter>(*g_window, liverpool.get());
const int result = sceKernelGetCompiledSdkVersion(&sdk_version);
const s32 result = sceKernelGetCompiledSdkVersion(&sdk_version);
if (result != ORBIS_OK) {
sdk_version = 0;
}

14
src/core/linker.cpp
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@ -108,10 +108,22 @@ void Linker::Execute(const std::vector<std::string> args) {
static constexpr s64 InternalMemorySize = 0x1000000;
void* addr_out{reinterpret_cast<void*>(KernelAllocBase)};
const s32 ret = Libraries::Kernel::sceKernelMapNamedFlexibleMemory(
s32 ret = Libraries::Kernel::sceKernelMapNamedFlexibleMemory(
&addr_out, InternalMemorySize, 3, 0, "SceKernelInternalMemory");
ASSERT_MSG(ret == 0, "Unable to perform sceKernelInternalMemory mapping");
// Simulate libSceGnmDriver initialization, which maps a chunk of direct memory.
// Some games fail without accurately emulating this behavior.
s64 phys_addr{};
ret = Libraries::Kernel::sceKernelAllocateDirectMemory(0,
Libraries::Kernel::sceKernelGetDirectMemorySize(), 0x10000, 0x10000, 3, &phys_addr);
if (ret == 0) {
void* addr{};
ret = Libraries::Kernel::sceKernelMapNamedDirectMemory(&addr, 0x10000, 0x13, 0, phys_addr,
0x10000, "SceGnmDriver");
}
ASSERT_MSG(ret == 0, "Unable to emulate libSceGnmDriver initialization");
main_thread.Run([this, module, args](std::stop_token) {
Common::SetCurrentThreadName("GAME_MainThread");
LoadSharedLibraries();