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Use managarm special fastmem fallback

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lizzie 2026-05-20 19:29:21 +00:00
parent c8c61a12c3
commit 8237e50ebd
2 changed files with 17 additions and 2 deletions
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17
src/common/host_memory.cpp
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@ -695,10 +695,21 @@ HostMemory::HostMemory(size_t backing_size_, size_t virtual_size_)
backing_base = fallback_buffer->data();
virtual_base = nullptr;
#else
bool has_memfd = true; // all platforms support it
#ifdef _WIN32
// EXCEPT WINDOWS who may not (Windows 8.1, 7, Vista, etc)
DynamicLibrary kernelbase_dll("KernelBase");
has_memfd = kernelbase_dll.IsOpen();
if (has_memfd) {
PFN_CreateFileMapping2 p{};
GetFuncAddress(kernelbase_dll, "CreateFileMapping2", p);
has_memfd = p != nullptr;
}
#endif
// Try to allocate a fastmem arena.
// The implementation will fail with std::bad_alloc on errors.
impl = std::make_unique<HostMemory::Impl>(AlignUp(backing_size, PageAlignment), AlignUp(virtual_size, PageAlignment) + HugePageSize);
if (impl->Init()) {
if (has_memfd && impl->Init()) {
backing_base = impl->backing_base;
virtual_base = impl->virtual_base;
if (virtual_base) {
@ -708,10 +719,12 @@ HostMemory::HostMemory(size_t backing_size_, size_t virtual_size_)
}
} else {
impl.reset();
LOG_WARNING(HW_Memory, "Platform can support fastmem, but can't create it");
LOG_WARNING(HW_Memory, "Platform doesn't support fastmem");
#ifdef _WIN32
fallback_buffer.emplace(backing_size);
backing_base = fallback_buffer->data();
virtual_base = nullptr;
#endif
}
#endif
}

2
src/common/host_memory.h
View file

@ -86,7 +86,9 @@ private:
u8* virtual_base{};
size_t virtual_base_offset{};
// Windows requires it for kernels whom lack proper support for some functions!
#if defined(__OPENORBIS__) || defined(__managarm__) || defined(_WIN32) || defined(__EMSCRIPTEN__)
std::optional<Common::VirtualBuffer<u8>> fallback_buffer;
#endif
};
} // namespace Common