refactoring read and write block calculations

2 files changed, 16 insertions, 3 deletions

diff --git a/kernel/devices/include/devices/BlockDevice.hpp b/kernel/devices/include/devices/BlockDevice.hpp
index 65d765b..56e26d0 100644
--- a/kernel/devices/include/devices/BlockDevice.hpp
+++ b/kernel/devices/include/devices/BlockDevice.hpp
@@ -9,11 +9,24 @@ namespace devices
 {
   struct block_device : device
   {
-    block_device(size_t major, size_t minor);
+    block_device(size_t major, size_t minor, size_t block_size);
     virtual ~block_device() = default;
 
     virtual auto read_block(size_t block_index, void * buffer) const -> void = 0;
     virtual auto write_block(size_t block_index, void const * buffer) -> void = 0;
+
+  protected:
+    struct transfer_info
+    {
+      size_t offset;
+      size_t to_transfer;
+      size_t remainder;
+    };
+
+    virtual auto size() const -> size_t = 0;
+    auto calculate_transfer(size_t block_index) const -> transfer_info;
+
+    size_t m_block_size;
   };
 }  // namespace devices
 
diff --git a/kernel/devices/include/devices/storage/RAMDisk/RAMDiskDevice.hpp b/kernel/devices/include/devices/storage/RAMDisk/RAMDiskDevice.hpp
index b3838e4..5971970 100644
--- a/kernel/devices/include/devices/storage/RAMDisk/RAMDiskDevice.hpp
+++ b/kernel/devices/include/devices/storage/RAMDisk/RAMDiskDevice.hpp
@@ -11,8 +11,6 @@ namespace devices::storage::ram_disk
 {
   struct ram_disk_device : block_device
   {
-    constexpr size_t static block_size = 512uz;  // TODO BA-FS26 really correct / good??
-
     ram_disk_device();  // TODO BA-FS26 remove when kstd::vector is available
     ram_disk_device(kapi::boot_modules::boot_module const & module, size_t major, size_t minor);
 
@@ -20,6 +18,8 @@ namespace devices::storage::ram_disk
     auto write_block(size_t block_index, void const * buffer) -> void override;
 
   private:
+    auto size() const -> size_t override;
+
     kapi::boot_modules::boot_module m_boot_module{};
   };
 }  // namespace devices::storage::ram_disk