From 419f4bebff5745b46bf30092dc7a7ca43449ea2e Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Wed, 1 Apr 2026 11:12:20 +0200
Subject: kernel/tests: implement basic simulated memory

---
 kernel/tests/src/main.cpp             |  4 ++++
 kernel/tests/src/simulated_memory.cpp | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100644 kernel/tests/src/simulated_memory.cpp

(limited to 'kernel/tests/src')

diff --git a/kernel/tests/src/main.cpp b/kernel/tests/src/main.cpp
index c0ec12f..69fd633 100644
--- a/kernel/tests/src/main.cpp
+++ b/kernel/tests/src/main.cpp
@@ -12,6 +12,10 @@ auto main(int argc, char ** argv) -> int
   kapi::interrupts::enable();
 
   kapi::memory::init();
+  // note: no kernel heap is created, since we are in the test environment. Nonetheless, we still initialize the memory
+  // subsystem, so that components that rely on it can be tested. No component must ever rely on the heap allocator
+  // directly, rather they have to go through the new and delete. However, some components may use the frame allocator
+  // and page mapper in order to perform their tasks.
 
   return Catch::Session().run(argc, argv);
 }
diff --git a/kernel/tests/src/simulated_memory.cpp b/kernel/tests/src/simulated_memory.cpp
new file mode 100644
index 0000000..9a9b354
--- /dev/null
+++ b/kernel/tests/src/simulated_memory.cpp
@@ -0,0 +1,33 @@
+#include "kernel/tests/simulated_memory.hpp"
+
+#include <kstd/units>
+
+#include <cstddef>
+#include <vector>
+
+namespace kernel::tests::simulated_memory
+{
+
+  namespace
+  {
+    auto constinit ram_storage = std::vector<std::byte>{};
+    auto constinit pmm_storage = std::vector<std::byte>{};
+  }  // namespace
+
+  auto init(kstd::units::bytes size) -> void
+  {
+    ram_storage.resize(size / kstd::units::bytes{1});
+    pmm_storage.resize(size / kstd::units::bytes{1});
+  }
+
+  auto pmm_metadata_base() -> std::byte *
+  {
+    return pmm_storage.data();
+  }
+
+  auto ram_base() -> std::byte *
+  {
+    return ram_storage.data();
+  }
+
+}  // namespace kernel::tests::simulated_memory
\ No newline at end of file
-- 
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