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-rw-r--r--src/core/CMakeLists.txt2
-rw-r--r--src/core/hle/kernel/memory/system_control.cpp41
-rw-r--r--src/core/hle/kernel/memory/system_control.h18
3 files changed, 61 insertions, 0 deletions
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 504ee2777..92ed3bdcf 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -159,6 +159,8 @@ add_library(core STATIC
hle/kernel/memory/memory_block.h
hle/kernel/memory/memory_types.h
hle/kernel/memory/slab_heap.h
+ hle/kernel/memory/system_control.cpp
+ hle/kernel/memory/system_control.h
hle/kernel/mutex.cpp
hle/kernel/mutex.h
hle/kernel/object.cpp
diff --git a/src/core/hle/kernel/memory/system_control.cpp b/src/core/hle/kernel/memory/system_control.cpp
new file mode 100644
index 000000000..e61522dc0
--- /dev/null
+++ b/src/core/hle/kernel/memory/system_control.cpp
@@ -0,0 +1,41 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <random>
+
+#include "core/hle/kernel/memory/system_control.h"
+
+namespace Kernel::Memory::SystemControl {
+
+u64 GenerateRandomU64ForInit() {
+ std::random_device device;
+ std::mt19937 gen(device());
+ std::uniform_int_distribution<u64> distribution(1, std::numeric_limits<u64>::max());
+ return distribution(gen);
+}
+
+template <typename F>
+u64 GenerateUniformRange(u64 min, u64 max, F f) {
+ /* Handle the case where the difference is too large to represent. */
+ if (max == std::numeric_limits<u64>::max() && min == std::numeric_limits<u64>::min()) {
+ return f();
+ }
+
+ /* Iterate until we get a value in range. */
+ const u64 range_size = ((max + 1) - min);
+ const u64 effective_max = (std::numeric_limits<u64>::max() / range_size) * range_size;
+ while (true) {
+ if (const u64 rnd = f(); rnd < effective_max) {
+ return min + (rnd % range_size);
+ }
+ }
+}
+
+u64 GenerateRandomRange(u64 min, u64 max) {
+ return GenerateUniformRange(min, max, GenerateRandomU64ForInit);
+}
+
+} // namespace Kernel::Memory::SystemControl
diff --git a/src/core/hle/kernel/memory/system_control.h b/src/core/hle/kernel/memory/system_control.h
new file mode 100644
index 000000000..3fa93111d
--- /dev/null
+++ b/src/core/hle/kernel/memory/system_control.h
@@ -0,0 +1,18 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+
+namespace Kernel::Memory::SystemControl {
+
+u64 GenerateRandomU64ForInit();
+
+template <typename F>
+u64 GenerateUniformRange(u64 min, u64 max, F f);
+
+u64 GenerateRandomRange(u64 min, u64 max);
+
+} // namespace Kernel::Memory::SystemControl