kernel: Add a hexdump() method to log binary data for debugging

kernel/src/Log.cpp

@@ -6,6 +6,7 @@
 #include <luna/Format.h>
 #include <luna/SourceLocation.h>
 #include <luna/Spinlock.h>
+#include <luna/StringBuilder.h>
 
 static bool g_debug_enabled = true;
 static bool g_serial_enabled = true;
@@ -174,3 +175,23 @@ static bool g_check_already_failed = false;
     }
     CPU::efficient_halt();
 }
+
+Result<void> hexdump(void* data, usize size)
+{
+    StringBuilder sb;
+
+    u8* ptr = (u8*)data;
+
+    while (size)
+    {
+        TRY(sb.format("%#2x ", *ptr));
+        ptr++;
+        size--;
+    }
+
+    auto message = TRY(sb.string());
+
+    kdbgln("hexdump: %s", message.chars());
+
+    return {};
+}

kernel/src/Log.h

@@ -26,6 +26,8 @@ void set_text_console_initialized();
 #define kwarnln(...) log(LogLevel::Warn, __VA_ARGS__)
 #define kerrorln(...) log(LogLevel::Error, __VA_ARGS__)
 
+Result<void> hexdump(void* data, usize size);
+
 [[noreturn]] extern void __critical_error_handler(SourceLocation location, const char* expr, const char* failmsg,
                                                   const char* errmsg);