build adjustments

src/common/host_memory.cpp

@@ -695,21 +695,10 @@ 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 (has_memfd && impl->Init()) {
+    if (impl->Init()) {
         backing_base = impl->backing_base;
         virtual_base = impl->virtual_base;
         if (virtual_base) {
@@ -719,8 +708,7 @@ HostMemory::HostMemory(size_t backing_size_, size_t virtual_size_)
         }
     } else {
         impl.reset();
-        LOG_WARNING(HW_Memory, "Platform doesn't support fastmem");
-#ifdef _WIN32
+        LOG_WARNING(HW_Memory, "Platform can support fastmem, but can't create it");
         fallback_buffer.emplace(backing_size);
         backing_base = fallback_buffer->data();
         virtual_base = nullptr;
@@ -734,13 +722,8 @@ HostMemory::HostMemory(HostMemory&&) noexcept = default;
 
 HostMemory& HostMemory::operator=(HostMemory&&) noexcept = default;
 
-#if defined(__OPENORBIS__) || defined(__managarm__) || defined(__wasi__) || defined(__EMSCRIPTEN__)
-void HostMemory::Map(size_t virtual_offset, size_t host_offset, size_t length, MemoryPermission perms, bool separate_heap) {}
-void HostMemory::Unmap(size_t virtual_offset, size_t length, bool separate_heap) {}
-void HostMemory::Protect(size_t virtual_offset, size_t length, MemoryPermission perm) {}
-void HostMemory::EnableDirectMappedAddress() {}
-#else
 void HostMemory::Map(size_t virtual_offset, size_t host_offset, size_t length, MemoryPermission perms, bool separate_heap) {
+#if !(defined(__OPENORBIS__) || defined(__managarm__) || defined(__wasi__) || defined(__EMSCRIPTEN__))
     ASSERT(virtual_offset % PageAlignment == 0);
     ASSERT(host_offset % PageAlignment == 0);
     ASSERT(length % PageAlignment == 0);
@@ -750,9 +733,11 @@ void HostMemory::Map(size_t virtual_offset, size_t host_offset, size_t length, M
         return;
     }
     impl->Map(virtual_offset + virtual_base_offset, host_offset, length, perms);
+#endif
 }
 
 void HostMemory::Unmap(size_t virtual_offset, size_t length, bool separate_heap) {
+#if !(defined(__OPENORBIS__) || defined(__managarm__) || defined(__wasi__) || defined(__EMSCRIPTEN__))
     ASSERT(virtual_offset % PageAlignment == 0);
     ASSERT(length % PageAlignment == 0);
     ASSERT(virtual_offset + length <= virtual_size);
@@ -760,9 +745,11 @@ void HostMemory::Unmap(size_t virtual_offset, size_t length, bool separate_heap)
         return;
     }
     impl->Unmap(virtual_offset + virtual_base_offset, length);
+#endif
 }
 
 void HostMemory::Protect(size_t virtual_offset, size_t length, MemoryPermission perm) {
+#if !(defined(__OPENORBIS__) || defined(__managarm__) || defined(__wasi__) || defined(__EMSCRIPTEN__))
     ASSERT(virtual_offset % PageAlignment == 0);
     ASSERT(length % PageAlignment == 0);
     ASSERT(virtual_offset + length <= virtual_size);
@@ -773,18 +760,20 @@ void HostMemory::Protect(size_t virtual_offset, size_t length, MemoryPermission
     const bool write = True(perm & MemoryPermission::Write);
     const bool execute = True(perm & MemoryPermission::Execute);
     impl->Protect(virtual_offset + virtual_base_offset, length, read, write, execute);
+#endif
+}
+
+void HostMemory::ClearBackingRegion(size_t physical_offset, size_t length, u32 fill_value) {
+    std::memset(backing_base + physical_offset, fill_value, length);
 }
 
 void HostMemory::EnableDirectMappedAddress() {
+#if !(defined(__OPENORBIS__) || defined(__managarm__) || defined(__wasi__) || defined(__EMSCRIPTEN__))
     if (impl) {
         impl->EnableDirectMappedAddress();
         virtual_size += reinterpret_cast<uintptr_t>(virtual_base);
     }
-}
 #endif
-
-void HostMemory::ClearBackingRegion(size_t physical_offset, size_t length, u32 fill_value) {
-    std::memset(backing_base + physical_offset, fill_value, length);
 }
 
 } // namespace Common

src/common/host_memory.h

@@ -86,9 +86,7 @@ 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