ams: support building unit test programs on windows/linux/macos

libraries/libstratosphere/source/os/impl/os_vamm_manager_impl.os.linux.hpp

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <stratosphere.hpp>
+#include <sys/mman.h>
+
+namespace ams::os::impl {
+
+    class VammManagerLinuxImpl {
+        public:
+            static void GetReservedRegionImpl(uintptr_t *out_start, uintptr_t *out_size) {
+                /* Reserve a 64 GB region of virtual address space. */
+                constexpr size_t ReservedRegionSize = 64_GB;
+                const auto reserved = ::mmap(nullptr, ReservedRegionSize, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+                AMS_ABORT_UNLESS(reserved != MAP_FAILED);
+
+                *out_start = reinterpret_cast<uintptr_t>(reserved);
+                *out_size  = ReservedRegionSize;
+            }
+
+            static Result AllocatePhysicalMemoryImpl(uintptr_t address, size_t size) {
+                R_UNLESS(::mprotect(reinterpret_cast<void *>(address), size, PROT_READ | PROT_WRITE) == 0, os::ResultOutOfMemory());
+                R_SUCCEED();
+            }
+
+            static Result FreePhysicalMemoryImpl(uintptr_t address, size_t size) {
+                R_UNLESS(::mprotect(reinterpret_cast<void *>(address), size, PROT_NONE) == 0, os::ResultBusy());
+                R_SUCCEED();
+            }
+
+            static consteval size_t GetExtraSystemResourceAssignedSize() {
+                return 0;
+            }
+
+            static consteval size_t GetExtraSystemResourceUsedSize() {
+                return 0;
+            }
+
+            static consteval bool IsVirtualAddressMemoryEnabled() {
+                return true;
+            }
+    };
+
+    using VammManagerImpl = VammManagerLinuxImpl;
+
+}