From bf90905a5ded3995af5677685bc31228d485e64b Mon Sep 17 00:00:00 2001
From: Lukas Oesch <lukasoesch20@gmail.com>
Date: Wed, 8 Apr 2026 18:52:11 +0200
Subject: add test block_device

---
 kernel/CMakeLists.txt                              |  1 +
 .../kernel/test_support/devices/block_device.hpp   | 31 ++++++++++++
 kernel/src/test_support/devices/block_device.cpp   | 58 ++++++++++++++++++++++
 3 files changed, 90 insertions(+)
 create mode 100644 kernel/include/kernel/test_support/devices/block_device.hpp
 create mode 100644 kernel/src/test_support/devices/block_device.cpp

diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt
index 85c7661..12683a1 100644
--- a/kernel/CMakeLists.txt
+++ b/kernel/CMakeLists.txt
@@ -101,6 +101,7 @@ else()
         "src/test_support/kapi/cio.cpp"
         "src/test_support/kapi/interrupts.cpp"
         "src/test_support/kapi/memory.cpp"
+        "src/test_support/devices/block_device.cpp"
         "src/test_support/log_buffer.cpp"
         "src/test_support/output_device.cpp"
         "src/test_support/page_mapper.cpp"
diff --git a/kernel/include/kernel/test_support/devices/block_device.hpp b/kernel/include/kernel/test_support/devices/block_device.hpp
new file mode 100644
index 0000000..2327fc4
--- /dev/null
+++ b/kernel/include/kernel/test_support/devices/block_device.hpp
@@ -0,0 +1,31 @@
+#ifndef TEACHOS_KERNEL_TEST_SUPPORT_DEVICES_BLOCK_DEVICE_HPP
+#define TEACHOS_KERNEL_TEST_SUPPORT_DEVICES_BLOCK_DEVICE_HPP
+
+#include "kernel/devices/block_device.hpp"
+
+#include <kstd/string>
+#include <kstd/vector>
+
+#include <cstddef>
+#include <cstdint>
+
+namespace kernel::tests::devices
+{
+
+  struct block_device : kernel::devices::block_device
+  {
+    block_device(size_t major, size_t minor, kstd::string const & name, size_t block_size);
+
+    auto init() -> bool override;
+
+    auto read_block(size_t block_index, void * buffer) const -> void override;
+    auto write_block(size_t block_index, void const * buffer) -> void override;
+
+    [[nodiscard]] auto size() const -> size_t override;
+
+    kstd::vector<uint8_t> data{};
+  };
+
+}  // namespace kernel::tests::devices
+
+#endif
\ No newline at end of file
diff --git a/kernel/src/test_support/devices/block_device.cpp b/kernel/src/test_support/devices/block_device.cpp
new file mode 100644
index 0000000..bce415f
--- /dev/null
+++ b/kernel/src/test_support/devices/block_device.cpp
@@ -0,0 +1,58 @@
+#include "kernel/test_support/devices/block_device.hpp"
+
+#include "kernel/devices/block_device.hpp"
+
+#include <kstd/string>
+#include <kstd/vector>
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+#include <string.h>
+
+namespace kernel::tests::devices
+{
+  block_device::block_device(size_t major, size_t minor, kstd::string const & name, size_t block_size)
+      : kernel::devices::block_device(major, minor, name, block_size)
+  {}
+
+  auto block_device::init() -> bool
+  {
+    return true;
+  }
+
+  auto block_device::read_block(size_t block_index, void * buffer) const -> void
+  {
+    auto const offset = block_index * block_size();
+    if (offset >= data.size())
+    {
+      kstd::libc::memset(buffer, 0, block_size());
+      return;
+    }
+
+    auto const bytes_to_read = std::min(block_size(), data.size() - offset);
+    kstd::libc::memcpy(buffer, data.data() + offset, bytes_to_read);
+    if (bytes_to_read < block_size())
+    {
+      kstd::libc::memset(static_cast<uint8_t *>(buffer) + bytes_to_read, 0, block_size() - bytes_to_read);
+    }
+  }
+
+  auto block_device::write_block(size_t block_index, void const * buffer) -> void
+  {
+    auto const offset = block_index * block_size();
+    auto const write_end = offset + block_size();
+    if (write_end > data.size())
+    {
+      data.resize(write_end, 0);
+    }
+
+    kstd::libc::memcpy(data.data() + offset, static_cast<uint8_t const *>(buffer), block_size());
+  }
+
+  auto block_device::size() const -> size_t
+  {
+    return data.size();
+  }
+}  // namespace kernel::tests::devices
\ No newline at end of file
-- 
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