implement read and write bytes from device

3 files changed, 49 insertions, 1 deletions

diff --git a/kernel/devices/include/devices/block_device.hpp b/kernel/devices/include/devices/block_device.hpp
index 78a2606..9bca53f 100644
--- a/kernel/devices/include/devices/block_device.hpp
+++ b/kernel/devices/include/devices/block_device.hpp
@@ -46,6 +46,28 @@ namespace devices
      */
     virtual auto write_block(size_t block_index, void const * buffer) -> void = 0;
 
+    /**
+     * @brief Return logical block size in bytes.
+     * @return One logical block size in bytes.
+     */
+    auto block_size() const -> size_t;
+
+    /**
+     * @brief Return device capacity in bytes.
+     * @return Total number of addressable bytes.
+     */
+    auto capacity() const -> size_t;
+
+    /**
+     * @brief Override to identify block devices.
+     * @return true if this device is a block device, false otherwise.
+     */
+
+    auto is_block_device() const -> bool override
+    {
+      return true;
+    }
+
   protected:
     /**
      * @brief Information describing the transfer window for one block index.
diff --git a/kernel/devices/include/devices/device.hpp b/kernel/devices/include/devices/device.hpp
index cbf77c2..7f9f9e1 100644
--- a/kernel/devices/include/devices/device.hpp
+++ b/kernel/devices/include/devices/device.hpp
@@ -34,6 +34,15 @@ namespace devices
      */
     auto minor() const -> size_t;
 
+    /**
+     * @brief Check if the device is a block device.
+     * @return true if this device is a block device, false otherwise.
+     */
+    virtual auto is_block_device() const -> bool
+    {
+      return false;
+    }
+
   private:
     size_t m_major;
     size_t m_minor;
diff --git a/kernel/devices/src/block_device.cpp b/kernel/devices/src/block_device.cpp
index dd63638..2f0c2ca 100644
--- a/kernel/devices/src/block_device.cpp
+++ b/kernel/devices/src/block_device.cpp
@@ -1,5 +1,7 @@
 #include "devices/block_device.hpp"
 
+#include "kapi/system.hpp"
+
 #include "devices/device.hpp"
 
 #include <cstddef>
@@ -9,7 +11,12 @@ namespace devices
   block_device::block_device(size_t major, size_t minor, size_t block_size)
       : device(major, minor)
       , m_block_size(block_size)
-  {}
+  {
+    if (m_block_size == 0)
+    {
+      kapi::system::panic("[DEVICES] block_device constructed with zero block size.");
+    }
+  }
 
   auto block_device::calculate_transfer(size_t block_index) const -> transfer_info
   {
@@ -21,4 +28,14 @@ namespace devices
 
     return {offset, to_transfer, m_block_size - to_transfer};
   }
+
+  auto block_device::block_size() const -> size_t
+  {
+    return m_block_size;
+  }
+
+  auto block_device::capacity() const -> size_t
+  {
+    return size();
+  }
 }  // namespace devices
\ No newline at end of file