partial (largely untested) memory block device and tar file system support

1 files changed, 27 insertions, 0 deletions

diff --git a/kernel/bd/memory.cpp b/kernel/bd/memory.cpp
new file mode 100644
index 0000000..1015e40
--- /dev/null
+++ b/kernel/bd/memory.cpp
@@ -0,0 +1,27 @@
+#include <mercury/kernel/bd/memory.hpp>
+
+namespace mercury::kernel::bd {
+
+  memory::memory(void *buffer, size_t buffer_len) : buffer((uint8_t *)buffer) {
+    block_size = 1;
+    block_count = buffer_len;
+    //block cache will never be used, since the block size is 1.
+  }
+
+  storage::io_result memory::read_blocks_no_cache(
+    uint64_t start, uint64_t count, void *into
+  ) {
+    for (uint64_t i = 0; i < count; ++i)
+      ((uint8_t *)into)[i] = buffer[start + i];
+    return storage::io_result::success;
+  }
+
+  storage::io_result memory::write_blocks_no_cache(
+    uint64_t start, uint64_t count, const void *into
+  ) {
+    for (uint64_t i = 0; i < count; ++i)
+      buffer[start + i] = ((uint8_t *)into)[i];
+    return storage::io_result::success;
+  }
+
+}